Leak detection work rarely announces in advance whether it’s an indoor job or an outdoor one. A call-out for “water coming from somewhere near the bathroom” might turn out to be a slab leak that’s tracked outside the building line. A high water bill investigation that starts at the meter might end up needing a wall cavity check once you’ve traced the line back into the house. For technicians who only carry indoor or only carry outdoor equipment, that kind of job means either turning up under-equipped or making a second trip — neither of which does much for your day rate or your client’s confidence.

The alternative — owning two separate leak detection kits — solves the coverage problem but creates a logistics one. Two units to charge, two cases to carry, two sets of consumables to track, and inevitably the one job that needs the kit currently sitting back at the workshop. For contractors and utility teams whose work spans both indoor plumbing and outdoor service lines as a matter of course, that’s an ongoing tax on every job, not just an occasional inconvenience.

One main unit, two purpose-built sensors

The HIKMICRO AD22P-I/O solves this by combining both sensor types into a single kit built around the same AD22P main unit and 7″ touchscreen used across the range. You get the high-sensitivity indoor sensor for wall, floor, ceiling, and underfloor heating leak detection, and the IP66-rated outdoor sensor for ground-contact detection of buried service lines, courtyards, and paved areas — plus listening sticks for fast, direct-contact checks on exposed pipework and fittings.

The unit auto-recognises whichever sensor is connected, so moving from an indoor wall check to an outdoor ground survey on the same job doesn’t involve any manual reconfiguration — unplug the indoor sensor, connect the outdoor sensor, and the AD22P-I/O adjusts its filtering and mode options accordingly. That matters on jobs where you genuinely don’t know at the outset whether the leak is going to end up being an indoor or outdoor problem, or where it turns out to be both.

Frequency coverage tuned for both environments

Indoor and outdoor leaks produce sound in meaningfully different frequency ranges, which is why the AD22P-I/O gives you dedicated presets for each rather than one generic setting stretched across both jobs. Indoor Mode 1 (5,000–16,000 Hz) and Indoor Mode 2 (8,000–16,000 Hz) are tuned for the higher-frequency sound typical of leaks travelling through building structure, while Outdoor Mode (200–2,000 Hz) is tuned to the lower-frequency signature of water escaping underground. Custom Mode extends across the instrument’s full 200–16,000 Hz range for the leaks that don’t sit neatly in either preset — whatever the pipe material, burial depth, or building construction throws at you.

SuperDetect, HIKMICRO’s automated leak-zone analysis feature, operates in indoor mode to highlight probable leak locations directly on the touchscreen — a genuine time-saver on indoor jobs, and one more reason the combo kit earns its place over carrying a basic listening-only tool for indoor work.

Two inspection workflows, whichever environment you’re in

The AD22P-I/O carries the same two inspection modes across both sensor types. Quick Inspection Mode supports fast, comparative screening — walk a suspected area, compare relative sound levels at a series of points, and narrow things down quickly, whether that’s a room inside a building or a stretch of paving outside it. Route Inspection Mode supports a more structured, multi-point survey for larger or more complex investigations, useful on bigger commercial properties or longer buried service runs where a quick scan alone won’t give you the confidence to commit to a cut or a dig point.

Being able to apply the same locate → localise → pinpoint workflow regardless of whether you’re indoors or outdoors means less mental context-switching between tools and more consistency in how you document and report findings.

Everything in one case

The AD22P-I/O kit includes the AD22P main unit, the indoor sensor, the outdoor sensor, listening sticks, a headset, and a hard carry case to keep the full kit organised and protected in transit. It’s genuinely built as a single, complete solution rather than a bundle of two separate product lines — one case to grab off the shelf before a job, regardless of what that job turns out to need.

A full day’s work, indoors or out

Battery performance doesn’t change based on which sensor is attached — the AD22P-I/O runs up to 11 hours continuously on its rechargeable Li-ion battery, with a 4-hour recharge time, whether you’re spending the morning inside a building and the afternoon tracing a service line outside it. Audio findings are saved in .wav format for review on PC, and image captures in .jpeg for documentation, with USB 2.0 (USB Type-C) connectivity for pulling data across for reporting once you’re back at the office.

Who the combo kit makes sense for

Full-service leak detection contractors who don’t want to turn down a job because it’s the “wrong” kit day. Plumbing companies fielding a mix of indoor plumbing call-outs and outdoor water-bill investigations from the same client base. Water utility contractors whose work regularly spans from the meter, along the service line, and into the building. Facility management teams responsible for both the building envelope and the surrounding grounds, where a leak investigation might legitimately need to go either way depending on where it leads. In every case, the value of the AD22P-I/O isn’t just having both sensors — it’s not having to predict, before you arrive on site, which one you’re going to need.

Backed by local support that understands the trade

We stock and support the full HIKMICRO acoustic leak detection range for Australian trade professionals, including advice on which kit configuration fits your actual job mix. If most of your work is squarely indoor or squarely outdoor, the dedicated AD22P-I or AD22P-O kit may be the more cost-effective choice — we’re happy to talk through the difference so you’re not paying for sensor coverage you won’t use. For contractors genuinely working across both environments, the AD22P-I/O is built to be the only leak detection kit you need to carry.

Technical Specifications

What is the HIKMICRO AD22P-I/O used for? The AD22P-I/O is a combined acoustic leak detector kit that includes both an indoor sensor and an IP66-rated outdoor sensor, allowing technicians to investigate leaks inside a building and in outdoor service lines or paved areas using a single device.

Why choose the AD22P-I/O over the separate indoor or outdoor kits? The combo kit removes the need to predict, before arriving on site, whether a job will end up being an indoor or outdoor leak investigation — both sensors are included, and the unit auto-recognises whichever one is connected.

Does the AD22P-I/O sacrifice anything compared to the dedicated indoor or outdoor kits? No — it uses the same main unit, the same indoor and outdoor sensors, and the same frequency ranges, inspection modes, and SuperDetect functionality found in the individual AD22P-I and AD22P-O kits, combined into one kit.

How does sensor switching work on the AD22P-I/O? The device auto-recognises which sensor is physically connected — indoor or outdoor — and adjusts its available filter presets and modes accordingly, with no manual configuration required.

Can the AD22P-I/O detect both a wall-cavity leak and a buried service line leak on the same job? Yes — that’s the specific scenario this kit is designed for, using the indoor sensor for the building-envelope portion of the investigation and the outdoor sensor for the buried or exterior portion.

How long does the AD22P-I/O run on a single charge? Up to 11 hours of continuous operation from its rechargeable Li-ion battery, with a 4-hour recharge time, regardless of which sensor is in use.

Who is the AD22P-I/O best suited for? Full-service leak detection contractors, plumbing companies, and water utility field teams whose work regularly spans both indoor plumbing investigations and outdoor property-side or service line leak detection.

The post HIKMICRO AD22P-I/O Indoor & Outdoor Leak Detector | AU appeared first on rapid-tech.

A leak in an outdoor service line rarely shows itself the way an indoor drip does. There’s no ceiling stain, no puddle under the sink — just water quietly disappearing into the ground under a driveway, a courtyard, or a stretch of buried pipe between the meter and the building. Often the first sign is a water bill that doesn’t add up, a damp patch appearing in an otherwise dry garden bed, or a section of paving that’s started to subside. By the time any of that is visible, the leak has usually been running for a while, and the water authority or property owner wants an answer fast: where, exactly, do we dig?

Digging blind is expensive and disruptive. Break up the wrong section of concrete, trench through the wrong garden bed, and you’ve added a repair bill on top of the leak itself — plus a client who’s now watching every move you make on the rest of the job. For contractors working property-side leak detection, plumbing companies fielding high water bill call-outs, or civil teams investigating service line loss, pinpoint accuracy before the shovel comes out isn’t a nice-to-have, it’s the entire value proposition.

Purpose-built for ground contact, not adapted from an indoor tool

The HIKMICRO AD22P-O pairs the AD22P main unit with an outdoor sensor engineered specifically for ground-contact use — a meaningfully different job to picking up sound through a plasterboard wall. Water escaping under pressure from a buried pipe generates low-frequency sound that travels through soil, paving, and pipe material before it reaches the surface, and the AD22P-O’s outdoor sensor and Outdoor Mode band-pass filter (200–2,000 Hz) are tuned to that lower frequency range specifically, rather than trying to stretch an indoor-tuned sensor to cover a job it wasn’t built for.

The kit also includes listening sticks — a more traditional, direct-contact method of picking up sound from valves, hydrants, and exposed pipe sections, useful for narrowing down a search area before committing to ground-sensor placement, or for jobs where a quick manual check is faster than setting up the full acoustic survey. Having both tools in one kit means you’re not carrying separate equipment for different stages of the same investigation.

Like the rest of the AD22P range, the AD22P-O auto-recognises which sensor is connected, so switching between the outdoor ground sensor and listening sticks on site doesn’t require digging through a menu — attach the sensor and the unit configures itself accordingly.

From general area to exact point

Outdoor leak jobs typically move through a broader search before narrowing down, and the AD22P-O’s two inspection modes reflect that. Quick Inspection Mode is built for walking a suspected stretch of pipe run or paved area and comparing relative sound levels at a series of points to rule areas in or out fast — useful when you’re trying to establish which side of a property boundary a leak sits on, or which section of a long service run is affected. Route Inspection Mode supports a more structured, multi-point walkthrough for longer runs or larger properties, building a clearer sound-intensity picture across the whole suspected area before committing to a dig point.

That locate → localise → pinpoint workflow matters more outdoors than almost anywhere else, because the cost of being wrong is measured in metres of unnecessary excavation, not just a patch-and-repaint job.

Custom Mode for the leaks that don’t play by the rules

Not every outdoor leak sits neatly in the 200–2,000 Hz Outdoor Mode band — pipe material, burial depth, soil type, and pressure all shift the acoustic signature. The AD22P-O’s Custom Mode lets you adjust anywhere across the instrument’s full 200–16,000 Hz range, so if a job’s producing a signal outside the standard outdoor preset, you’re not stuck guessing — you can tune the filter to match what you’re actually hearing.

What’s in the outdoor kit, specifically

The AD22P-O is built around outdoor property-side work: the AD22P main unit and its 7″ touchscreen, the dedicated ground-contact outdoor sensor, listening sticks for direct-contact checks, a headset for clear monitoring in noisy outdoor conditions (traffic, wind, nearby equipment), and a hard carry case to keep the kit protected between sites. It doesn’t include the high-sensitivity indoor sensor that ships with the AD22P-I — if your work also takes you inside the building envelope regularly, the combined AD22P-I/O kit covers both scenarios with a single device rather than requiring two separate kits.

Rated to work a full day outdoors

Field jobs run long, and the AD22P-O carries the same 11-hour continuous battery life and 4-hour recharge as the rest of the AD22P range, so a full day of property surveys or a multi-site route doesn’t mean carrying a spare battery or hunting for a power point. Audio and image data are stored on-device — audio in .wav format for review on PC, images in .jpeg for documentation — with USB 2.0 (USB Type-C) connectivity for transferring findings back to the office for reporting or client sign-off.

Who this kit is built for

Plumbing and leak detection contractors responding to unexplained high water bills on residential or commercial properties. Water utility field teams and contractors investigating service line loss between the meter and the property boundary. Civil and irrigation contractors tracking leaks in buried supply lines across larger sites. Facility and grounds maintenance teams responsible for outdoor infrastructure at commercial or institutional properties, where an undetected leak can undermine paving, erode garden beds, or waste significant volumes of water over time.

Backed by local trade support

We supply and support HIKMICRO’s acoustic leak detection equipment for Australian trade professionals, which means you get advice on the right kit for the work you actually do, ready access to accessories, and after-sales support from a team that understands test and measurement gear. If you’re not sure whether the outdoor-only AD22P-O or the combined AD22P-I/O kit is the better fit, we’re happy to talk through your typical job mix.

Technical Specifications

What is the HIKMICRO AD22P-O used for? The AD22P-O is an acoustic leak detector configured for outdoor, property-side water leak detection — locating leaks in buried service lines, under paving, and across courtyards or garden areas outside the building envelope.

Why does the AD22P-O use a different sensor to the indoor AD22P-I? Underground leak sound travels differently to indoor leak sound — it’s typically lower frequency and needs to be picked up through ground contact rather than through a wall or floor, which is why the AD22P-O ships with a dedicated outdoor sensor rated IP66 and an Outdoor Mode filter tuned to 200–2,000 Hz.

What’s included in the AD22P-O kit that isn’t in the AD22P-I kit? The AD22P-O includes the outdoor ground-contact sensor and listening sticks, in place of the AD22P-I’s indoor sensor. Technicians who need both are better served by the combined AD22P-I/O kit.

Can the AD22P-O be used to trace leaks in buried water service lines? Yes — that’s the core use case for this configuration, using the outdoor sensor’s ground-contact detection alongside listening sticks for exposed valves and pipe sections.

How rugged is the AD22P-O outdoor sensor? The outdoor sensor carries an IP66 rating, providing dust-tight and high-pressure water jet protection suited to ground contact and outdoor field conditions.

How long does the AD22P-O run before needing a recharge? Up to 11 hours of continuous operation from its rechargeable Li-ion battery, with a 4-hour recharge time.

What are listening sticks used for on the AD22P-O? Listening sticks provide a direct-contact way to pick up sound from valves, hydrants, and exposed pipework, useful for narrowing a search area quickly before or alongside a full ground-sensor survey.

The post HIKMICRO AD22P-O Outdoor Acoustic Leak Detector | AU appeared first on rapid-tech.

A dripping tap is easy. A leak behind a bathroom wall, under a slab, or inside a hydronic heating loop is a different job altogether. By the time a ceiling stain, a spike in the water bill, or a damp patch on the carpet gives the game away, water may have been tracking through a wall cavity or under a floor for weeks. Every hour spent guessing at a leak location is an hour of potential water damage, mould growth, and an increasingly frustrated homeowner or facility manager standing over your shoulder.

The traditional fallback — invasive investigation — means cutting into plasterboard, lifting tiles, or trenching a slab on a hunch. Get it wrong and you’ve created a repair bill on top of the original problem, plus a client who’s now questioning your judgement. For technicians working across strata properties, aged care facilities, or commercial fitouts, that kind of exploratory damage isn’t just costly, it’s often not an option at all.

How the AD22P-I earns its keep

The HIKMICRO AD22P-I is built specifically to answer one question with confidence: where, exactly, is this leak? It does that by listening rather than guessing. Pressurised water escaping through even a hairline crack in a pipe generates a distinct acoustic signature — a hiss or turbulent flow noise that travels through pipework, concrete, and building structure. The AD22P-I’s indoor sensor is tuned to pick up that signature through walls, floors, and ceilings, while the main unit’s processing does the work of separating leak noise from the ambient racket of an occupied building — foot traffic, HVAC systems, appliances, road noise from outside.

What sets this unit apart from a basic listening stick is HIKMICRO’s SuperDetect function. Rather than relying purely on trained ears and years of field experience, SuperDetect analyses the captured acoustic data and highlights the areas most likely to contain the leak directly on the 7″ touchscreen. It’s not a replacement for technician judgement — it’s a second opinion that helps newer techs get up to speed faster and helps experienced techs move through a job with more certainty and less second-guessing.

The AD22P-I also gives you control over exactly what frequency range you’re listening to, which matters more than it sounds. Different leak scenarios — a slab leak, a wall-cavity leak, an underfloor heating pipe — produce sound at different frequencies depending on pipe material, water pressure, and what the sound has to travel through before it reaches the sensor. Indoor Mode 1 (5,000–16,000 Hz) and Indoor Mode 2 (8,000–16,000 Hz) give you two pre-set bands tuned for typical indoor scenarios, while Custom Mode lets you dial in anywhere from 200 to 16,000 Hz if a job needs something more specific. That flexibility means you’re not fighting the instrument to get a clean signal — you’re tuning it to the job in front of you.

Two ways to work a job

Every leak investigation doesn’t follow the same pattern, so the AD22P-I supports two inspection workflows. Quick Inspection Mode is built for rapid comparison — walk the suspected area, compare relative sound intensity at a handful of points, and narrow down a general zone fast. That’s the mode you reach for when a facilities manager wants an answer before lunch and the leak is reasonably contained to one section of a building.

Route Inspection Mode is the more methodical option: a structured, multi-point walkthrough that builds a clearer picture across a wider area before you commit to a pinpoint location. It’s the better fit for larger commercial fitouts, multi-unit residential buildings, or any job where getting it wrong the first time means a second, more awkward conversation with the client about why the wall’s been opened up twice.

Locate, localise, pinpoint — that’s the practical workflow this device is designed around, and having both inspection modes available means you’re not forcing every job through the same process.

What’s actually in the box, and why it matters for indoor work

The AD22P-I kit is built around indoor scenarios specifically — it isn’t trying to be everything to everyone. You get the AD22P main unit with its 7″ touchscreen, the dedicated high-sensitivity indoor sensor, a headset for clear audio monitoring in noisy environments, and a hard carry case to keep the kit protected and organised between jobs. The unit auto-recognises the connected sensor, so there’s no manual configuration step slowing you down on site — attach the indoor sensor and the AD22P-I is ready to work.

Because this is the indoor-specific kit, it doesn’t include the outdoor ground-contact sensor or listening sticks that come with HIKMICRO’s outdoor and combo kits. If your work regularly takes you outside the building envelope — service lines, courtyards, paved areas — the AD22P-O or the combined AD22P-I/O kit will cover that ground as well. For technicians whose leak detection work is squarely indoor plumbing, wall, floor, and underfloor heating investigation, the AD22P-I is the more focused, better-value option.

Built for a full day on site

Battery life matters when you’re moving between jobs or working through a large commercial floor plate, and the AD22P-I is rated for up to 11 hours of continuous operation from its rechargeable Li-ion battery, with a 4-hour charge time when you do need to top it up. Audio findings are stored on the device and image captures can be saved directly for reporting, with the touchscreen giving you a straightforward way to review captured data on site before you finalise a diagnosis. Data connects out via USB 2.0 (USB Type-C), making it simple to pull captured audio and images across to a PC for closer review, documentation, or client reporting via HIKMICRO’s companion software.

Who reaches for the AD22P-I

Plumbing contractors chasing intermittent leaks in occupied homes, where cutting into the wrong wall isn’t an option. Facility managers and body corporate maintenance teams responsible for aged buildings with ageing copper or PEX runs behind finished surfaces. Hydronic heating specialists needing to trace a leak in an underfloor loop without lifting an entire floor. Insurance assessors and building inspectors who need to document leak location and extent as part of a claim or condition report. In each case, the value isn’t just finding the leak — it’s finding it with enough confidence to justify where you’re about to cut, drill, or dig.

Why source it through us

We stock and support HIKMICRO’s acoustic leak detection range specifically for Australian trade professionals, which means local advice on which kit configuration actually suits your work, straightforward access to accessories and consumables, and after-sales support from people who understand test and measurement equipment rather than a generic electronics retailer. If you’re weighing up the AD22P-I against the outdoor or combo kit, we’re happy to talk through which one matches the jobs you’re actually doing.

Technical Specifications

What is the HIKMICRO AD22P-I used for? The AD22P-I is an acoustic leak detector built for locating hidden water leaks inside buildings — behind walls, under floors, and within underfloor heating pipework — without needing to cut into finishes to find the source first.

How does the AD22P-I find a leak without seeing it? It listens for the acoustic signature that pressurised water makes as it escapes through a crack or joint, using a dedicated indoor sensor and adjustable band-pass filters to isolate that sound from general building noise, then uses SuperDetect to highlight the most likely leak zone on-screen.

What’s the difference between the AD22P-I and the AD22P-O? The AD22P-I is fitted out for indoor work with a high-sensitivity indoor sensor, while the AD22P-O is configured for outdoor, ground-contact leak detection with an outdoor sensor and listening sticks. The AD22P-I/O combo kit includes both sensor types for technicians who need to cover indoor and outdoor scenarios with one device.

Can the AD22P-I detect leaks in underfloor heating pipes? Yes — underfloor heating loops are one of the harder indoor leak scenarios to diagnose without invasive investigation, and it’s a typical use case for the indoor sensor and SuperDetect combination.

How long does the AD22P-I run on a single charge? The unit is rated for up to 11 hours of continuous operation from its rechargeable Li-ion battery, with a 4-hour recharge time.

Does the AD22P-I require training to use effectively? It’s designed to be usable by both new and experienced technicians — SuperDetect assists less experienced users by highlighting likely leak zones, while the manual amplification and custom frequency mode give experienced technicians full control when they want it.

What inspection workflows does the AD22P-I support? Two modes: Quick Inspection Mode for fast, comparative screening of a suspected area, and Route Inspection Mode for structured, multi-point investigation across a wider space.

The post HIKMICRO AD22P-I Indoor Acoustic Leak Detector | AU appeared first on rapid-tech.

A circuit breaker contact can look perfect on a standard milliohm test and still fail under load. That’s because contact resistance readings taken at 1 A or 10 A don’t reveal how a joint behaves when it’s actually carrying fault current or heavy switching loads. Loose bolted busbar connections, pitted breaker contacts, and degraded welded joints often pass a low-current check and then run hot — or fail outright — the moment real current flows through them.

For electrical contractors, substation maintenance crews, and industrial reliability teams working across Australia’s electricity network, this gap between “tests fine” and “performs fine” is a genuine risk. A missed high-resistance joint in a switchboard or substation bus can mean nuisance tripping, localised heating, insulation degradation, or in the worst case, a thermal event during a planned outage window when there’s no time to re-test and re-terminate. Standard multimeters and clamp meters simply aren’t built to inject the current levels needed to properly qualify these connections, and general-purpose micro-ohmmeters rated for a few amps won’t replicate real-world switching or fault conditions either.

The Solution: High-Current Testing in a Compact, Field-Ready Package

The Megger DLRO600 addresses this directly by pushing test current up to 600 A DC — a level that genuinely exercises high-current joints the way they’re meant to be exercised, rather than just sampling them at a token current. It measures resistance from 0.1 µΩ up to roughly 1 Ω, using a four-terminal (Kelvin) technique that separates the current-carrying leads from the voltage-sensing leads. This cancels out test lead and contact resistance from the measurement, so what’s on the display is the actual resistance of the joint under test — not an artefact of how far the leads run or how hard the clamps are gripping.

What makes the DLRO600 genuinely practical on-site is the balance Megger has struck between output power and portability. It weighs less than 14.5 kg and measures roughly 410 x 250 x 270 mm, which is remarkably compact for an instrument capable of sustaining 600 A for over 60 seconds continuously at 20°C ambient. That’s enough grunt to properly test large busbar joints and circuit breaker contacts without the instrument becoming the bottleneck in your test sequence, and it’s light enough that one technician can carry it into a switchroom or up to a substation bay without a trolley.

Three test modes cover the range of jobs contractors actually face. Auto mode is built for repetitive testing — connect the current leads to a busbar run once, then simply touch the potential leads across each joint in turn; the DLRO600 detects the connection, fires a test automatically, and stops, which speeds up multi-joint busbar surveys considerably. Normal mode runs a single 7-second test cycle for one-off contact checks. Continuous mode holds current flowing and refreshes the reading every 2 seconds, useful for monitoring a joint’s behaviour as it’s flexed, torqued, or thermally cycled during commissioning work.

Built for the Way Australian Trade Professionals Actually Work

Every result — up to 300 of them — can be tagged with a note via the on-board alphanumeric keypad and stored in battery-backed memory that retains data for up to 10 years, which matters when you’re compiling a compliance report weeks after the site visit and need to remember which reading came from which panel. Results transfer via RS232, either in real time to a printer or in batch to a PC running Megger’s Download Manager software, so field data becomes a proper test report without manual transcription.

The DLRO600’s power supply tolerates 207–265 V at 50/60 Hz for full-rated output, which sits comfortably within Australia’s 230 V nominal single-phase supply and its normal tolerance band — no step-up transformer or special site power needed for standard mains circuits. Reduced output is still available down to 100 V, useful where site power is constrained. The instrument carries IEC61010-1 safety and IEC61326-1 EMC compliance, the baseline international standards that AS/NZS 61010.1 and AS/NZS 61326.1 are aligned with for Australian electrical test equipment.

Where the DLRO600 Earns Its Keep

Circuit breaker maintenance: Contact resistance testing on MV and HV breakers during scheduled outages, where a rising resistance trend across maintenance cycles flags contact wear before it causes a problem.

Switchgear and busbar work: Testing bolted and welded busbar joints in switchboards, switchrooms, and substations — Auto mode makes multi-joint surveys along a busbar run considerably faster than manual point-and-test methods.

Industrial and mining maintenance: Verifying weld and connection integrity on heavy plant, conveyor bonding, and high-current distribution equipment where contact degradation leads to localised heating and downtime.

Rail and transit: Checking rail bonding and catenary connection integrity, where high-current contact quality is directly tied to service reliability.

Calibration and test labs: As a reference-grade low-resistance source for verifying other low-resistance test equipment, backed by the DLRO600’s own accuracy specification of better than 1% across its mid-range.

Why Buy It Here

We stock genuine Megger test and measurement equipment backed by local technical support that understands Australian compliance requirements and site conditions — not just a spec sheet. If you need calibration traceability, loan units, or help specifying the right lead set for your longest busbar run, our team can talk you through it before you buy, not just after.

Technical Specifications

Note: The manufacturer datasheet references IEC standards directly. See Publisher Notes below regarding AS/NZS equivalence and RCM status.

What is the Megger DLRO600 used for? The Megger DLRO600 is a 600 A micro-ohmmeter used to measure very low resistance — from 0.1 µΩ up to around 1 Ω — on high-current electrical joints such as circuit breaker contacts, busbar connections, switch contacts, and welded joints. It’s built for maintenance and commissioning work where a low-current test wouldn’t properly stress the joint under test.

How much test current does the DLRO600 output? The DLRO600 delivers test currents from 10 A up to 600 A DC in 1 A steps, subject to load resistance and supply voltage. It can sustain 600 A continuously for more than 60 seconds at 20°C ambient, which is enough to properly test large busbar joints and breaker contacts.

How does the DLRO600 measure resistance so accurately? It uses a four-terminal (Kelvin) measurement technique, which separates the current-carrying leads from the voltage-sensing leads. This cancels the resistance of the test leads and connections from the reading, leaving a measurement of just the joint or contact under test — accurate to better than 1% across its mid-range (100 µΩ to 100 mΩ).

Is the Megger DLRO600 suitable for Australian 230 V mains supply? Yes. The DLRO600’s power supply operates at full rated output from 207 V to 265 V at 50/60 Hz, which comfortably covers Australia’s 230 V nominal single-phase supply and its standard tolerance range without needing a step-up transformer.

How many test results can the DLRO600 store? The DLRO600 stores up to 300 test results with notes in on-board memory, battery-backed to retain data for up to 10 years. Results can be downloaded in real time or in batch via the RS232 port using Megger’s Download Manager software.

What’s the difference between Auto, Normal, and Continuous mode on the DLRO600? Normal mode runs a single 7-second test cycle for one-off checks. Auto mode automatically detects when potential leads make contact and fires a test, which speeds up sequential busbar or multi-joint surveys. Continuous mode holds current flowing and refreshes the reading every 2 seconds, useful for monitoring a connection while it’s being worked on.

How heavy and portable is the DLRO600? The DLRO600 weighs 14.5 kg excluding test leads and measures 410 x 250 x 270 mm, making it compact enough for one technician to carry into a switchroom or substation bay despite its 600 A output capability.

The post Megger DLRO600 600A Micro-Ohmmeter | High-Current Tester appeared first on rapid-tech.

There’s a specific and expensive mistake that gets made on three-phase measurement: using a two-element meter on a four-wire system.

On a balanced load you might not notice. The numbers look plausible. But the moment the load is unbalanced — and in a real building, a real factory, a real solar installation, it always is — the two-wattmeter method stops giving you correct total power on a four-wire circuit. Current is returning through the neutral, and a two-element instrument has no channel measuring it.

The Yokogawa WT333E digital power meter is the three-element answer. Three voltage inputs, three current inputs, one per phase, with total power calculated as the straightforward sum: P∑ = P1 + P2 + P3.

That’s not a clever algorithm. It’s just having enough channels — and on a four-wire system, three is the number.

Four wiring configurations, one instrument

The WT333E is the most configurable model in the WT300E series, supporting:

Three-phase four-wire (3P4W). The configuration that matters most in Australia. Our distribution standard is 400 V (nominally 415 V) phase-to-phase with a 230 V phase-to-neutral relationship — a four-wire system by design. Every commercial switchboard-fed load, every mixed single-phase-and-three-phase installation, every unbalanced building distribution is 3P4W. Total voltage, current and power are summed across all three elements, giving correct results regardless of balance.

Three-voltage three-current (3V3A). The three-wattmeter method applied to a three-wire system. You don’t strictly need three elements on a three-wire circuit, but 3V3A gives you something two elements can’t: individual voltage, current and power data for each phase, plus improved handling of distorted and unbalanced conditions. Total apparent power is computed as (√3/3)(S1 + S2 + S3).

Three-phase three-wire (3P3W). The conventional two-wattmeter method, if you want it.

Single-phase three-wire (1P3W). Split-phase measurement.

The practical upshot: one instrument on the shelf covers every wiring configuration you’re likely to encounter, and you don’t have to make a purchasing decision about your future measurement problems today.

Per-phase visibility, which is the point

Total power tells you what the system draws. Per-phase data tells you why.

With three elements, the WT333E gives you voltage, current, active power, apparent power, reactive power, power factor and phase angle for each element independently — and frequency measurement selectable from the voltage or current of element 1, 2 or 3.

That’s what turns a power meter into a diagnostic instrument. Phase imbalance that’s overloading one conductor. A power factor problem isolated to one leg. A harmonic issue that only appears on the phase feeding the drives. None of that is visible in a summed total.

Accuracy and bandwidth

Basic power accuracy is ±(0.1% of reading + 0.05% of range) at 45–66 Hz, consistent across all measurement ranges. Yokogawa states that WT332E and WT333E performance matches that of the WT310E.

The influence at power factor 0 is ±0.1% of apparent power between 45 and 66 Hz — half the previous generation’s figure. On three-phase distribution work this is the specification that decides whether your measurement is useful. Reactive-heavy loads, lightly loaded motors, capacitor banks and no-load conditions all sit at low power factor, and at low PF the influence term dominates your total uncertainty.

Bandwidth is DC and 0.1 Hz to 100 kHz, with voltage and current converted simultaneously through a 16-bit A/D at approximately 100 kS/s. Simultaneous conversion is what preserves the phase relationship between the voltage and current channels — and phase error is what destroys power accuracy on any waveform that isn’t a clean sinusoid. Which, on a modern distribution board feeding inverters, LED drivers, UPS units and variable-speed drives, is most of them.

Where the WT333E does work others can’t

Three-phase four-wire distribution measurement. Unbalanced building loads, mixed-phase installations, commercial plant. Correct total power plus per-phase diagnosis.

Unbalanced load analysis. Identifying which phase is carrying the imbalance, quantifying it, and having the per-element data to prove it.

Three-phase efficiency measurement. Efficiency computation is built into the WT333E (as it is on the WT332E, and unlike the single-element WT310E). Measure a converter, transformer, drive or motor input against its output on one instrument, one timebase, one calibration.

Motor and rotating machinery duration testing. Integration runs to 10,000 hours — approximately one year. With the /C7 Ethernet option, Modbus/TCP feeds Yokogawa’s GA10 data-gathering software, which can combine your electrical measurements with temperature, torque and rotation speed data across up to 200 channels. That’s a complete motor test dataset in one logging environment.

UPS conformance and evaluation. Input and output levels, efficiency, frequency and THD, with average active power under integration mode giving a true consumption figure for fluctuating loads.

Harmonic and power quality investigation on three-phase systems. With the /G5 option, PLL-synchronised harmonic analysis to the 50th order on all three elements, with a settable maximum THD order — so you can see harmonic content phase by phase rather than as an aggregate.

Three-phase product development and QA. USB standard, GP-IB (–C1) or RS-232 (–C2) at order, /C7 Ethernet with Modbus/TCP and VXI-11 for recorder and PLC integration, and the /DA12 option for twelve channels of ±5 V analogue output — sized for the parameter count that three elements generate.

Australian context worth knowing

The 3P4W capability is the reason this model matters here. Australian LV distribution is four-wire, and a great deal of commercial and industrial measurement work involves loads that are meaningfully unbalanced. The WT333E’s 300 V and 600 V voltage ranges cover both the 230 V phase-to-neutral and 400/415 V phase-to-phase relationships directly.

Now the important caveat, and it deserves to be blunt: the WT333E is a measurement category CAT II, 600 Vrms instrument. Yokogawa’s documentation states plainly that it is a measurement category II product and must not be used for measurement categories III or IV.

CAT III covers facility circuits — distribution boards and circuit breakers. CAT IV covers power source circuits such as entrance cables. So while the WT333E is the correct topology for four-wire systems, it is a bench, test-rig and machine-terminal instrument, not a switchboard instrument. If your job is measuring at the distribution board itself, you need an instrument rated for that category, regardless of how good this one’s specifications are. That distinction is a safety matter, not a paperwork one.

Order the –R power cord suffix for the AS-standard plug. Supply is 100–240 VAC (90–264 V permitted) at 48–63 Hz, 70 VA maximum.

The instrument is Class A under EN 55011 — an industrial-environment device. Operating it in a residential area may cause radio interference, and correcting that interference is the user’s responsibility.

Why buy the WT333E from us

The three-element decision usually comes down to one question, and it’s worth getting right before you order: does your system have a neutral that carries current? If yes, you need three elements. If no, two will do — and we’ll tell you that rather than sell you up.

We’ll also work through the option codes with you. /G5 harmonics, /C7 Ethernet, /EX1 or /EX2 external sensor input and /DA12 analogue output are factory-fitted at time of order. Getting the configuration right at purchase is considerably cheaper than discovering the gap three months into a project.

We’re a test and measurement specialist. We supply, we support, we calibrate, and we’re around after the sale. Tell us what you’re measuring and we’ll help you spec it.

TECHNICAL SPECIFICATIONS

What is the Yokogawa WT333E used for? The Yokogawa WT333E is a three-element digital power meter used to measure three-phase four-wire (3P4W), three-voltage three-current (3V3A), three-phase three-wire and single-phase three-wire systems. Three elements give correct total power on unbalanced four-wire loads plus individual voltage, current and power data for every phase — making it the model of choice for three-phase distribution measurement, motor and drive efficiency testing, UPS evaluation and phase-by-phase harmonic analysis.

Why do I need three elements instead of two? Because of the neutral. On a three-phase four-wire system, current returns through the neutral conductor, and a two-element instrument has no channel measuring it — so on an unbalanced load, a two-element meter will not give correct total power. Three elements measure each phase independently and sum them (P∑ = P1 + P2 + P3), which is correct regardless of balance. If your system genuinely has no current-carrying neutral, two elements are sufficient and the WT332E will do the job.

Can the WT333E measure 400/415 V three-phase in Australia? Its 600 V range covers 400/415 V phase-to-phase and its 300 V range covers 230 V phase-to-neutral, and the 3P4W wiring configuration matches Australian LV distribution. However, the WT333E is a measurement category CAT II, 600 Vrms instrument and Yokogawa states it must not be used for CAT III or CAT IV measurements. That makes it suitable at machine terminals and on test rigs fed from a fixed installation, but not for measurement at distribution boards, circuit breakers or service entrance cables.

What is the difference between the WT332E and WT333E? The number of input elements. The WT332E has two and supports 1P3W and 3P3W wiring. The WT333E has three and adds 3P4W and 3V3A configurations, plus per-phase data on all three phases and frequency measurement selectable from any of the three elements. Accuracy, bandwidth, current ranges, voltage ranges, physical size and options are otherwise the same.

What is 3V3A and when would I use it? Three-voltage three-current is the three-wattmeter method applied to a three-wire system. You don’t need three elements on a three-wire circuit for total power, but 3V3A gives you individual phase data that the two-wattmeter method cannot, and handles unbalanced and distorted conditions better. Use it when you want per-phase diagnostic detail on a three-wire load. Total apparent power in 3V3A is computed as (√3/3)(S1 + S2 + S3).

Does the WT333E measure harmonics on all three phases? With the /G5 harmonics option fitted, yes — harmonic measurement applies to all installed elements. It uses PLL synchronisation across a fundamental frequency range of 10 Hz to 1.2 kHz, analyses to the 50th order, and allows the maximum order used for THD calculation to be set by the user. Without /G5 the instrument measures RMS, voltage mean and DC values but not harmonic components.

Can the WT333E calculate efficiency? Yes. Efficiency computation is built into both the WT333E and the WT332E. Because both the input and output measurements are taken by the same instrument on the same timebase and the same calibration, you avoid the synchronisation and relative-drift errors that come with running two separate power meters and reconciling their logs afterwards.

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FLIR IR windows are easy to install, easy to use, and will help you work with greater confidence. You’ll perform inspections more efficiently and reduce the threat of arc flash injury, all while staying in compliance with NFPA 70E requirements.

The windows are also available in an Stainless Steel frame.

Also Available in 2″ & 3″ size.

FLIR IR Aluminium Windows Features:

Easy Installation – FLIR IR Windows install quickly and securely using the same design as common conduit connections:
• Only one hole to create for each window
• One simple PIRma-Lock™ ring nut to tighten
• Uses standard US punch tools for hole knockouts

Quick Access Hinged Cover – Simple thumb screw releases the permanently-hinged IR window cover:
• Easy, fl ip-open hatch for faster scans
• Prevents dropping, mix-ups, and loss
• Inside label for permanent identification

Broadband Crystal IR Window – Lens encased in rugged, anodized aluminum frame allows indoor & outdoor scans:
• Transmits short, mid and longwave IR images
• Supports visual inspections and fusion features
• Lets laser pointers and illumination shine through

Greater Productivity and ROI – Significantly reduces inspection time for more efficient assessments within NFPA 70E guidelines:
• Requires only one person instead of three
• Can reduce or eliminate need for cumbersome PPE
• Helps reduce vast majority of arc fl ash triggers

FLIR Integrity – FLIR backs IRW-Series windows with comprehensive testing and a limited lifetime warranty:
• Meets relevant UL, CSA, IEC, and IEEE standards/ratings
• Tested samples withstood arcs, vibration, and extreme humidity
• Limited Lifetime Warranty against manufacturer defects

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Ask any electrician who’s had a loop test come back marginal, then had to explain it to a client or a compliance auditor, and they’ll tell you: confidence in the number matters as much as the number itself. Standard multifunction testers are built to do a bit of everything, and loop impedance is often just one function among a dozen. When you’re dealing with high fault currents, non-standard frequencies, or three-phase distribution boards where accuracy and speed both count, a dedicated high current loop tester earns its place in the van.

The Megger LT300-EN-00 was built around exactly that problem. It’s a dedicated, single-purpose instrument for high current loop impedance testing — no menus to dig through, no mode-switching, just a two-wire connection and a result. For contractors who run loop tests constantly across new installs, periodic inspections, and fault-finding call-outs, that focus translates directly into fewer steps between arriving on site and having a documented, defensible reading.

Built for the realities of loop testing, not just the textbook case

Prospective fault current and loop impedance testing sounds simple in principle — inject a signal, measure the response — but the environments technicians actually work in rarely cooperate. Supply frequency varies depending on the installation (mains, generator supply, or specialised applications). Voltages fluctuate. Job sites are dusty, wet, or poorly lit. And clients increasingly expect test records that hold up to scrutiny, whether that’s an insurer, a facility manager, or a compliance body.

The LT300-EN-00 addresses each of these head-on. It automatically detects supply frequency on connection — 16 Hz, 50/60 Hz, or 400 Hz — and begins testing without any manual configuration, which matters when you’re moving between standard mains work and specialised frequency environments such as rail, marine, aerospace ground power, or certain industrial supplies. The operational voltage range runs from 50 V up to 550 V (400 V at 16 Hz), covering single-phase CAT IV 300 V phase-to-earth work as well as phase-to-phase measurements up to 550 V — with a built-in warning if voltage exceeds 330 V, flagging a possible accidental phase-to-phase connection on what should be a 230 V single-phase circuit. That’s a genuinely useful safety check on Australian 230 V/415 V three-phase systems, where a wiring error at the board can otherwise go unnoticed until it’s too late.

On the display side, the LT300-EN-00 uses a large, high-contrast readout designed to stay legible in poor lighting — switchboard cupboards, roof spaces, plant rooms — and the whole unit sits inside a rubber armoured housing with a built-in cover that protects the display when the instrument isn’t in use. Combined with an IP54 weatherproof rating, it’s built to survive the day-to-day knocks of a working toolbox rather than a lab bench.

Two ranges, two use cases, one tool

The LT300-EN-00 covers loop impedance across two measurement ranges: a 20 Ω range with resolution down to 0.01 Ω, and a 200 Ω range with 0.1 Ω resolution. In practice, that means the same instrument handles both tight, high-current circuits close to a supply — where small resistance changes matter and RCD/PFC calculations need precision — and longer runs or higher-impedance circuits further from the source. Test currents scale with supply voltage and range, from as little as 0.3 A at 50 V on the 200 Ω range up to 27 A at 550 V on the 20 Ω range, giving technicians a realistic picture of prospective fault current under the conditions the circuit will actually see.

Loop test accuracy is rated at ±5% ±0.03 Ω on the 20 Ω range and ±5% ±0.5 Ω on the 200 Ω range — figures worth having on hand when a client questions a borderline result, or when a reading needs to be cross-checked against a previous test.

Two-wire operation: less setup, less to go wrong

The LT300-EN-00 ships with a two-wire (red/green) lead set as standard — no earth lead to route, no third connection point to manage at the board. For technicians running loop tests across dozens of circuits in a single inspection, that simplicity adds up. Fewer connections mean less time per test and less opportunity for a loose or reversed lead to compromise a result. It’s a deliberately stripped-back approach to a task that, done properly, doesn’t need to be complicated.

Who reaches for the LT300-EN-00

Electrical contractors and testing and tagging technicians doing new installation testing, periodic inspection and testing, or fault investigation will find the two-wire workflow suits high-volume loop testing across distribution boards and final sub-circuits, with the 330 V phase-to-phase warning acting as a useful sanity check on three-phase Australian switchboards.

Industrial maintenance teams working around plant with non-standard supply frequencies — including 400 Hz systems used in aviation ground power, some marine environments, and specific industrial machinery — get automatic frequency detection rather than having to manually configure a general-purpose tester for an unusual supply.

Facility managers and compliance-focused teams overseeing scheduled electrical safety inspections benefit from a Certificate of Test supplied with the unit and consistent, repeatable readings that support clear documentation trails for audits and insurance requirements.

Rail, transit, and specialised infrastructure technicians working with 16 Hz or 16.7 Hz traction supply systems have a tool that natively recognises and tests at that frequency without workarounds.

What’s in the box

The LT300-EN-00 is supplied with a two-wire (red/green) lead set with crocodile clips, a hard carry case for transport and storage, and a Certificate of Test. It runs on 8 x AA (LR6) alkaline or NiMH rechargeable cells, keeping it independent of mains power for site use.

Backed by a brand technicians already trust

Megger has been a name in electrical test equipment for well over a century, and the LT300 series carries that same design philosophy: purpose-built instruments that do one job precisely rather than many jobs adequately. For Australian trade professionals who need a loop tester that’s ready to work straight out of the case — accurate, rugged, and simple to operate — the LT300-EN-00 is built to earn its place in the kit.

Technical Specifications

Test Current by Voltage and Range

What is the Megger LT300-EN-00 used for? The Megger LT300-EN-00 is a dedicated high current loop impedance tester used to measure prospective fault current and loop resistance on single and three-phase electrical circuits, using a simple two-wire (red/green) lead connection.

What frequency range does the LT300-EN-00 operate at? It automatically detects and tests at 16 Hz, 50/60 Hz, or 400 Hz, covering standard mains supplies as well as specialised applications such as rail traction supply and 400 Hz aviation or marine systems.

Is the LT300-EN-00 CAT IV rated? Yes. It’s rated CAT IV 300 V for phase-to-earth applications, and supports phase-to-phase testing up to 550 V (400 V at 16 Hz), meeting the requirements of IEC 61010-1.

What’s the difference between the LT300-EN-00, LT300-EN-BS, and LT300-EN-FS? All three share the same core loop tester. The LT300-EN-00 is supplied with a standard two-wire red/green lead set, the LT300-EN-BS comes with a BS1363 mains plug lead for wall socket testing, and the LT300-EN-FS is supplied with a fused red/green lead set.

What resolution does the LT300-EN-00 offer on loop impedance tests? It provides 0.01 Ω resolution on the 20 Ω range and 0.1 Ω resolution on the 200 Ω range, with loop test accuracy of ±5% ±0.03 Ω and ±5% ±0.5 Ω respectively.

What power source does the LT300-EN-00 use? It runs on 8 x AA (LR6) alkaline or NiMH rechargeable cells, so it doesn’t rely on mains power for operation in the field.

How rugged is the LT300-EN-00 for site use? It’s housed in a rubber armoured case with a built-in display cover and carries an IP54 weatherproof rating, and is rated for operation from -10°C to +60°C.

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There’s a hard lesson every sparkie or maintenance tech eventually learns: a bargain-bin multimeter costs you far more in wasted time and wrong readings than it ever saves at checkout. Whether you’re chasing a voltage drop in an industrial switchboard, verifying isolation on a 400 V drive system, or checking VFD output waveforms on a conveyor line, you need a meter that tells you the truth — every time.

The Megger AVO840 True RMS Digital Multimeter is built for exactly that environment. Rated CAT III 1000 V and CAT IV 600 V to IEC 61010, it covers the full sweep of Australian trade and industrial applications, from 230 V residential circuits right through to 415 V three-phase industrial plant. It’s not just a safety rating on paper — the AVO840 is double-insulated, drop-tested to 2 m, and rated IP44 for dust and water resistance. You can use it in a motor control centre, a roof cavity, or a construction site in the rain.

True RMS Measurement — Why It Actually Matters

An average-responding meter will give you a dangerously misleading reading on anything other than a pure sine wave. The AVO840 delivers genuine True RMS measurement across both AC voltage and AC current — meaning it accurately captures the real heating value of distorted, pulsed, triangular, and trapezia waveforms with an AC bandwidth of 50 Hz to 1 kHz.

In practical terms: when you’re testing VFD motor outputs, power supplies, UPS systems, or any load with non-linear switching characteristics, the AVO840 gives you the number you can actually act on. Average-responding meters on these signals can be off by 10–40%. That’s the difference between a pass and a missed fault.

Low-Z Mode — Silence the Ghost Voltages

Anyone who’s worked on modern energy-efficient buildings or long cable runs knows the frustration of ghost voltages — stray induced voltages that show up on dead circuits and make you doubt whether something is truly de-energised. The AVO840’s Low-Z mode switches the input to an approximately 3 kΩ impedance, loading the circuit enough to collapse any capacitively coupled phantom voltage while still measuring genuine supply voltages accurately.

This is especially important for compliance verification: when you need to prove a circuit is isolated before working on it, a ghost voltage reading on a high-impedance meter creates unnecessary risk and paperwork. The AVO840 gives you a clean, reliable answer.

Stay Connected — Bluetooth & the AVO Link App

The AVO840 pairs wirelessly with Android or iOS devices via Bluetooth, giving you access to the free Megger AVO Link App. This lets you log readings remotely, monitor measurements from a safe distance when working near energised equipment, share live data with a colleague or supervisor, and run more sophisticated diagnostics from your phone or tablet.

For solar installers doing string voltage checks on rooftops, or maintenance technicians monitoring motor current trends across a shift, the ability to capture and export readings without transcription errors is a genuine productivity gain.

Built for the Trade Environment

The AVO840 isn’t a lab instrument dressed up for field use — it’s designed from the ground up for working tradies and technical professionals:

Drop resistance: Tested to survive a 2 m fall onto a hard surface. In an enclosure panel or on a scaffold, meters get dropped. The AVO840 is built to survive it.

IP44 enclosure: The double-moulded housing keeps out dust and water splashes, making the AVO840 suitable for outdoor work and harsh industrial environments.

Built-in LED torch: The working light means you can probe junction boxes, switchboards, and dark cable trays without needing a second set of hands. Small detail, big difference on the job.

Analogue bar graph: Useful for tracking signals that fluctuate over time — motor startup currents, contact bounce, voltage instability — where a numerical display updates too slowly to capture what’s happening.

Auto power off: Activates after approximately 15 minutes of inactivity so you’re not chasing a flat battery on the job.

Measurement Capability at a Glance

The AVO840 covers the full range of measurements a working electrician or maintenance tech needs in a single instrument:

• AC & DC Voltage to 1000 V (6000-count resolution, True RMS)
• AC & DC Current to 10 A (μA, mA, and A ranges)
• Resistance to 60 MΩ (6 ranges from 600 Ω to 60 MΩ)
• Capacitance to 6000 μF (6 ranges)
• Frequency to 10 kHz with duty cycle measurement
• Temperature −20 °C to 760 °C via K-type thermocouple (included)
• Continuity with audible beep (< 50 Ω threshold)
• Diode test (1 mA typical test current, 3 V open circuit voltage)
• Min/Max/Average recording for signal fluctuation capture

Who the AVO840 Is Right For

Electrical Contractors: Everyday voltage proving, fault finding, continuity checking, and load current measurement — from domestic switchboards through to commercial switchgear. CAT III 1000 V and CAT IV 600 V coverage handles the full range of Australian installation work.

Industrial Maintenance Teams: Motor current trending, VFD output analysis, PLC signal verification, and HVAC system diagnostics. True RMS and Low-Z are non-negotiable for this environment. The AVO840 handles it all.

Solar Installers: String voltage checking, insulation testing preparation, and inverter output measurement. Bluetooth data logging means fewer errors when recording results at height or in awkward positions.

Facility Managers & Safety Officers: Voltage verification before maintenance tasks, continuity confirmation in emergency lighting systems, and general electrical safety spot-checks. The AVO840’s ruggedness and clear CAT rating make it a defensible choice for compliance documentation.

HVAC Technicians: Temperature measurement with included K-type thermocouple, motor current measurement, capacitor testing, and low-voltage control circuit verification.

Technical Specifications

What’s in the Box

• AVO840 Multimeter (1015-514)
• 1 m 4 mm non-fused right-angle connector test leads × 2 (rated CAT III 1000 V / CAT IV 600 V / 10 A max)
• 4 mm exposed metal probes × 2
• Exposed tip probes for CAT II probing × 2
• Red and black crocodile clips (rated double insulated, CAT III 1000 V / CAT IV 600 V / 10 A max)
• K-type multimeter adapter
• K-type thermocouple lead
• Soft carry case
• 4 mm cap plugs × 2
• AAA alkaline batteries (pre-installed)

What is the Megger AVO840 used for?

The Megger AVO840 is a professional True RMS digital multimeter used for electrical fault-finding, industrial maintenance, and compliance verification. It measures AC and DC voltage to 1000 V, AC and DC current to 10 A, resistance to 60 MΩ, capacitance to 6000 μF, frequency to 10 kHz, and temperature via K-type thermocouple. Common applications include switchboard testing, motor current measurement, VFD output analysis, HVAC diagnostics, and voltage proving on de-energised circuits. It is suited for licensed electricians, industrial maintenance teams, solar installers, and HVAC technicians working across Australian residential, commercial, and industrial sites.

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What does Low-Z mean on a multimeter?

Low-Z (low impedance) mode switches the multimeter’s voltage input to a low input impedance — approximately 3 kΩ on the AVO840 — rather than the standard high-impedance input (> 10 MΩ). This loads the circuit under test enough to suppress ghost voltages: stray induced voltages that appear on de-energised conductors near live cables due to capacitive coupling. In Low-Z mode, a genuine live voltage will still read correctly, but phantom voltages will collapse to near zero. This makes Low-Z mode essential for safe absence-of-voltage verification before commencing electrical work.

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Is the Megger AVO840 True RMS?

Yes. The AVO840 measures both AC voltage and AC current using True RMS (Root Mean Square) calculation, not average-responding simulation. True RMS accurately measures the real heating value of any AC waveform — including distorted, pulsed, triangular, and trapezia waveforms — with an AC bandwidth of 50 Hz to 1 kHz. This is essential when measuring variable frequency drive (VFD) outputs, UPS systems, electronic ballasts, switching power supplies, and other non-sinusoidal loads where average-responding meters can produce readings that are 10–40% in error.

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What safety rating does the Megger AVO840 have?

The AVO840 is rated CAT III 1000 V and CAT IV 600 V in accordance with IEC 61010-2-033. CAT III 1000 V covers fixed electrical installation work including distribution boards, switchgear, and industrial equipment operating from a 230/400 V supply. CAT IV 600 V covers measurements at the origin of a low-voltage installation — such as utility metering points and overhead line connection points. The meter also complies with IEC 61010-1 Pollution Degree 2 and carries EMC certification to IEC 61326-1 / CISPR 11 Group 1 Class A.

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Does the Megger AVO840 work with a phone app?

Yes. The AVO840 connects to Android and iOS smartphones and tablets via Bluetooth, and is compatible with the free Megger AVO Link App. The app allows you to view live measurements remotely, log readings over time, capture Min/Max/Average data, and share results digitally — useful for reporting, commissioning documentation, and monitoring readings from a safe distance when working near energised equipment.

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How tough is the Megger AVO840?

The AVO840 is rated IP44 (protection against solid objects > 1 mm and water splashing from any direction) with a double-moulded enclosure. It has been designed and tested to withstand a 2 m drop onto a hard surface. It operates in temperatures from 0 to 40 °C at up to 70% relative humidity, and can be stored down to −10 °C. The fuses are high-rupture-capacity types: 10 A / 1000 V / 30 kA on the amp input and 800 mA / 1000 V / 30 kA on the mA input, providing substantial overcurrent protection in the event of a test error.

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What accessories come with the AVO840?

The AVO840 (part number 1015-514) ships with a comprehensive accessory set: two 1 m 4 mm right-angle test leads, two 4 mm metal probes, two exposed-tip CAT II probes, red and black crocodile clips, a K-type thermocouple lead and multimeter adapter for temperature measurement, a soft carry case, 4 mm cap plugs, and AAA alkaline batteries. All included leads are rated double insulated, CAT III 1000 V / CAT IV 600 V / 10 A max. Optional accessories include fused test leads (part 1002-015), unfused test leads with crocodile clips (1002-001), and a magnetic hanging strap (1010-013).

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