Key Features

• Large-diameter loop is ideal for measuring large wires and pairs of wires.
• In small spaces
• Freely bendable

Note: CT6280 is a flexible current sensor for measuring large currents. It is not suitable for measuring minute current such as leakage current.

For the CM3291/89, 3280-10F and similar products

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Every sparky knows the frustration – you’re staring at a packed switchboard with wires bundled tight, barely enough room to get your fingers in, let alone a bulky clamp meter. Standard testers simply won’t fit between closely-spaced conductors or around cables crammed against the back of the panel. You need accurate current readings to diagnose circuit loading, verify installation work, or troubleshoot faults, but your gear physically can’t access the measurement point.

This problem becomes critical when you’re working with modern installations featuring VFDs, inverters, and switch-mode power supplies. These non-linear loads create harmonic distortion that throws off basic averaging meters, giving you misleading readings that can result in undersized cables, nuisance tripping, or failed compliance testing. You need a meter that’s both physically compact enough to access tight spaces and technically sophisticated enough to measure accurately in today’s power quality environment.

Built for Access: The Slimmest Profile That Doesn’t Sacrifice Performance

The CM3289 solves the access problem with a redesigned sensor profile that’s significantly thinner than previous models whilst maintaining the full measurement capability you’d expect from HIOKI’s professional range. At just 16mm thick, this meter slips into gaps that would stop conventional clamp testers dead. The 33mm jaw diameter handles standard building wiring and distribution cables, whilst the slim form factor means you can actually get around conductors in densely-packed boards.

What sets this meter apart from cheap card testers is the True RMS measurement engine. When you’re checking current draw on equipment with inverter drives, LED lighting ballasts, or any load with a non-sinusoidal waveform, True RMS calculation gives you the actual heating effect current – not the artificially low reading you’d get from an average-responding meter. This accuracy matters when you’re sizing circuit protection, calculating voltage drop, or documenting compliance for sign-off.

The meter handles crest factors up to 2.5 at 2500A, which covers the inrush characteristics of motors, transformers, and capacitive loads without clipping or false readings. You’re measuring reality, not a filtered approximation.

Genuine Job Site Durability: Not Another Delicate Pocket Tool

Many compact meters compromise on ruggedness to achieve their small size. The CM3289 takes the opposite approach – it’s engineered to survive the knocks and temperature extremes of real electrical work. The meter’s rated for drops from 1 metre onto concrete, which means it’ll handle the inevitable tumble out of your shirt pocket or off the top of a ladder. The -25°C to 65°C operating range covers everything from cool room work and refrigeration fault-finding through to switchboard testing on 40-degree summer days in un-airconditioned plant rooms.

CAT IV 300V and CAT III 600V current measurement ratings, plus CAT III 300V voltage measurement, give you the safety margins required for work at the origin of supply and distribution boards. These aren’t marketing numbers – they’re IEC-certified protection levels that define the transient overvoltage protection built into the meter’s input circuitry.

The coin cell battery provides 70 hours of continuous operation, and spares are available from any servo, so you’re never stuck on a job with a flat meter. Auto power-save extends battery life further by shutting down after 15 minutes of inactivity.

When Standard Clamps Won’t Reach: Flexible Sensor Option

Some installations defeat even the slimmest jaw clamp – think paired cables feeding large loads, bundles of paralleled conductors in distribution boards, or bus bars in tight enclosures. For these situations, the CM3289 accepts the optional CT6280 flexible current sensor, which extends your measurement capability to 4199A and allows you to loop around cable groupings or irregularly-shaped conductors.

The flexible sensor’s 130mm opening diameter handles thick cables and multiple conductors, whilst the Rogowski coil design means you simply loop it around the load and clip the ends together – no need to disconnect or physically fit through a rigid jaw. This is particularly valuable for retrofit monitoring work in existing installations where you can’t easily isolate circuits.

Complete Electrical Testing in One Compact Package

Beyond clamp current measurement, the CM3289 provides the full suite of electrical testing functions you need on every job:

DC Voltage Measurement: 600V range with ±1.0% accuracy for battery systems, solar strings, control circuits, and DC distribution. The 420mV lowest range gives you precision for small signal work and voltage drop testing.

AC Voltage Measurement: True RMS AC voltage to 600V, accurately reading distorted waveforms from inverters, UPS systems, and harmonic-laden loads. 45-500Hz frequency range covers standard power and higher-frequency switching supplies.

Resistance Measurement: Six ranges from 420Ω to 42MΩ let you test circuit continuity, conductor integrity, earth bonds, and insulation resistance (for basic checks – you’ll still need a proper insulation tester for AS/NZS 3000 compliance verification).

Continuity Testing: Audible buzzer at 50Ω or less provides hands-free confirmation of good connections, earthing, and circuit integrity without needing to look at the display.

Data Hold Function: Freeze the reading on screen so you can record results in cramped positions where you can’t see the meter whilst taking the measurement.

This all-in-one capability means you carry one tool instead of multiple meters, saving pocket space and reducing the chance you’ll turn up to a job missing the tester you need.

Real-World Applications Across Electrical Trades

Residential and Commercial Contractors: Verify circuit loading during renovations and additions, check appliance current draw for compliance documentation, troubleshoot tripping circuits, confirm balanced loading on three-phase distribution boards. The compact size means you can take readings in consumer units without removing the board or disturbing adjacent circuitry.

Industrial Maintenance: Monitor motor current for bearing wear detection and overload diagnosis, verify VFD output current, check three-phase balance on production equipment, measure current draw during equipment commissioning. The True RMS function is essential for inverter-fed motors where average meters give misleading results.

Solar Installation: Measure DC string current to verify array performance and detect partial shading or failed panels, check inverter output current against nameplate ratings, verify current balance across multiple MPPT inputs. The wide operating temperature range handles rooftop work year-round.

HVAC Technicians: Check compressor current draw to detect refrigerant issues or mechanical problems, verify fan motor operation, measure control transformer loading, diagnose starting circuit faults. The flexible sensor option is ideal for getting around compressor wiring in tight equipment enclosures.

Apprentices and Trainers: The meter’s combination of professional accuracy, safety ratings, and straightforward operation makes it ideal for teaching proper electrical measurement technique. The clear display and data hold function help apprentices learn to interpret readings correctly.

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Walk onto any Australian job site and you’ll see the same challenge: crowded electrical enclosures, tight cable runs, and equipment that needs testing now – not after you’ve spent ten minutes trying to get your clamp meter into position. Whether you’re troubleshooting a solar inverter at a rooftop installation or checking motor currents in a packed industrial panel, access matters as much as accuracy.

The HIOKI 3288 solves this problem with genuine engineering intelligence. At just 16mm thick with a 35mm jaw opening, this clamp meter slips into cable bundles and around busbars where bulkier instruments simply won’t fit. But compact doesn’t mean compromised – you’re getting CAT III 600V safety rating on current measurements and the measurement versatility of a full multimeter, all in a tool that weighs just 150 grams.

AC/DC Current Measurement That Actually Works

Here’s where the HIOKI 3288 earns its place in your tool kit. Both models measure up to 1000A in AC or DC, covering everything from lighting circuits to heavy industrial motors. The key difference comes down to your typical workload:

The 3288 uses average rectified measurement – ideal for maintenance work on standard 50Hz equipment where you’re checking steady-state currents on motors, heaters, and conventional electrical loads. It’s the workhorse choice for industrial maintenance teams and commercial electricians focused on pure sinusoidal waveforms.

The 3288-20 employs True RMS measurement technology, essential when you’re working with modern electronics. Variable frequency drives, solar inverters, UPS systems, and electronic ballasts all produce non-sinusoidal waveforms that only True RMS can accurately measure. If you’re servicing renewable energy systems, data centres, or any facility with significant electronic loads, the 3288-20 gives you measurements you can actually trust.

Beyond Current: Full Diagnostic Capability

Current measurement is just the beginning. The HIOKI 3288 packs in all the functions you need for complete circuit diagnostics:

Voltage testing covers DC from 419.9mV to 600V and AC from 4.199V to 600V across multiple ranges. Check control circuits, verify supply voltages, or test battery banks without switching instruments. CAT III 300V rating on voltage measurements provides appropriate protection for most mains work.

Resistance measurement spans six ranges from 419.9Ω to 41.99MΩ, letting you verify earth continuity, check heating element integrity, or troubleshoot high-resistance faults. The continuity function provides audible confirmation at 50Ω or less – perfect for quick cable checks when you’re working in noisy environments or tight spaces where you can’t easily see the display.

Job Site Practicality Built In

HIOKI designed this clamp meter for real electrical work, not laboratory conditions. The double-jaw lever provides secure one-handed operation – critical when you’re balanced on a ladder or reaching into awkward positions. The auto-zero function on DC current eliminates drift and offset errors, so you’re not second-guessing your readings when checking battery discharge rates or DC motor loads.

Data hold freezes measurements on the 4199-count LCD when you need to record values in locations where the display isn’t visible. Auto power-save extends the CR2032 battery life to 60 hours (3288) or 35 hours (3288-20), and battery changes take seconds without tools – no searching for screwdrivers when you’re mid-job.

The slim 57mm width fits comfortably in your hand and your tool pouch. At 150 grams, you’ll barely notice it’s there until you need it. The included carrying case keeps everything organised and protected during transport.

Applications That Match Australian Electrical Work

This isn’t a meter for occasional use – it’s built to be your daily diagnostic tool across diverse applications:

Industrial maintenance teams use the 3288 for motor current checks, three-phase load balancing, and fault-finding on everything from conveyors to compressors. The 1000A range handles industrial equipment while the slim profile accesses packed motor control centres.

Solar installers rely on the 3288-20’s True RMS capability for accurate inverter output measurements and DC string current verification. Test both sides of your solar installation – DC array currents and AC inverter output – with one instrument.

Commercial electricians appreciate the combination of current measurement and full multimeter functions when commissioning switchboards or diagnosing circuit faults. Check breaker loading, verify neutral currents, and troubleshoot control circuits without juggling multiple tools.

HVAC technicians need accurate current readings on compressors, fan motors, and electronic controls. The 3288’s range of measurement functions covers everything from motor amperage to thermostat voltages in a single compact package.

Why Choose This HIOKI Clamp Meter

HIOKI brings over 80 years of electrical measurement expertise to every instrument they manufacture. The 3288 series represents practical engineering refined through real-world feedback from technicians and electricians worldwide. You’re not just buying test equipment – you’re investing in measurement confidence backed by a company that understands precision matters.

We supply both the 3288 and 3288-20 models with everything you need: meter, test leads, carrying case, and battery installed ready for work. Need calibration certification? We can arrange NATA-traceable calibration to ensure your measurements meet compliance requirements for workplace safety testing and quality assurance documentation.

Australian warranty support and local technical assistance mean you’re not dealing with overseas delays if you have questions or need service. We understand the instruments we sell because we work with the same trade professionals who use them daily.

APPLICATIONS BY TRADE

Electrical Contractors & Sparkies

Verify circuit loading during switchboard commissioning, check motor starter currents, diagnose tripping breakers by measuring actual draw versus rated capacity. The slim profile accesses crowded distribution boards where standard clamp meters simply won’t fit. Use continuity function for quick cable identification and earth bond verification during rough-in work.

Industrial Maintenance Teams

Monitor motor currents for bearing wear and overload conditions, balance three-phase loads across distribution, troubleshoot VFD-driven equipment with True RMS accuracy. The 1000A range covers large industrial motors while portable size enables testing across sprawling facilities. Resistance measurement identifies heating element failures and loose connections before they cause downtime.

Solar & Renewable Energy Installers

Measure DC string currents during commissioning, verify inverter output with True RMS accuracy, check battery charge and discharge rates. Test both DC and AC sides of solar installations without changing instruments. The 1000A DC range handles large battery banks and high-power inverter inputs common in commercial solar systems.

HVAC Service Technicians

Check compressor running currents against nameplate ratings, measure fan motor loads, verify capacitor-start motor performance, diagnose electronic control circuits. Voltage and resistance functions allow complete system diagnostics from power supply through to thermostat circuits. Compact size reaches into tight service spaces behind equipment.

Facilities & Building Maintenance

Conduct routine load surveys across building distribution, identify phantom loads and inefficient equipment, verify circuit capacity before adding new equipment. Data hold function enables single-person testing in locations where the meter can’t be easily observed. Quick continuity checks confirm earth paths during safety inspections.

Data Centre & IT Infrastructure

Monitor UPS load distribution, verify redundant power supplies drawing balanced current, check PDU circuit loading with True RMS accuracy crucial for non-linear electronic loads. The 3288-20’s True RMS measurement handles the distorted waveforms typical in modern IT environments where average-responding meters give misleading results.

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Introducing the Megger DPM1000 Power Clamp Meter, an essential tool for professionals in the electrical and electronics industry. This high-performance device seamlessly integrates the functionalities of a power meter, harmonics meter, and data logger, ensuring accurate and comprehensive electrical measurements for electricians, engineers, and technicians.

Key Features

• Wide Voltage and Current Range: Measure both AC and DC voltages and currents up to 1000 V and 1000 A, respectively, making it versatile for various applications.
• True RMS Measurement: Provides precise readings that truly reflect the power usage and current flow in complex, non-linear loads.
• Advanced Connectivity: Sync with the Megger Link app through the built-in Bluetooth feature for effortless data logging and analysis on mobile devices.
• Safety Assured: With a CAT IV 600 V rating, the DPM1000 is designed to safely withstand environments with higher transient over-voltages.
• Comprehensive Measurements: Capture all relevant power parameters, including energy consumption, frequency, total harmonic distortion, and capacitance.
• Durable and Portable: Comes with a carrying case and holster, making it convenient to transport and deploy on-site.

Enhanced Usability

The Megger DPM1000 boasts a large, backlit LCD screen for clear visibility of all measurements, even in dimly lit environments. Its robust design includes a bright LED torch to assist with visibility in dark or confined spaces, and the instrument’s ergonomic clamp jaws allow for easy application on standard wiring sizes.

With its automatic non-contact voltage detection, the DPM1000 ensures increased operator safety by alerting users to the presence of live circuits, avoiding unnecessary contact with hazardous voltages. Additionally, the device features a continuity beeper, phase rotation indication, and auto-shutoff to conserve battery life.

Versatile Applications

Ideal for professionals involved in the development, installation, maintenance, and troubleshooting of power electronic devices, the DPM1000 is an invaluable asset in optimizing power quality. Its ability to measure temperature up to 1000 °C using the provided thermocouple further expands its versatility across various industrial and commercial applications.

Specifications

• Max Resistance Reading: 100kΩ ;
• Electrical Measurement Category: CAT III 1000 V, CAT IV 600 V
• AC/DC Current Range: 0 – 1000 A
• AC/DC Voltage Range: 0 – 1000 V

Order Your Megger DPM1000 Today

Elevate your power measurement capabilities with the Megger DPM1000 Power Clamp Meter. Order today to experience a blend of precision, safety, and functionality in one user-friendly package. Be equipped to manage any electrical measurement task with unrivaled efficiency and ease. Visit our store to learn more and secure your tool for advanced diagnostics in power electronics.

The post Megger DPM1000 Power Clamp Meter – Advanced Electrical Measurements with True RMS Accuracy and Bluetooth Connectivity for Professional Technicians and Engineers appeared first on rapid-tech.

The Megger DCM320 Clamp Meter is a versatile and efficient tool designed for professionals in the electrical installation industry. This digital clamp meter is engineered to deliver precise and reliable measurements, making it an essential instrument for inspecting and maintaining electrical systems. With its ergonomic, pocket-sized design, the DCM320 is as portable as it is powerful.

Features and Benefits

• Multifunction Measurement Capabilities: The DCM320 is not just limited to current measurement; it offers the enhanced capability of measuring both AC and DC voltages up to 600 V. This versatility makes it an invaluable tool for a range of electrical testing scenarios.
• Comprehensive Range: With a maximum current measuring range of 400 A AC, the Megger DCM320 can handle a broad array of applications in the electrical installation and maintenance fields, from routine inspections to complex troubleshooting tasks.
• Enhanced Resolution and Accuracy: The low current ranges of the DCM320 offer improved resolution, ensuring that even the smallest fluctuations in current are captured accurately. This precision helps avoid erroneous measurements that could compromise safety and efficiency.
• Convenience Features: Equipped with a ‘Data hold’ function, the DCM320 allows users to freeze the displayed value, granting extra time to record or assess readings without haste. This feature proves particularly useful in challenging environments where viewing the display might be difficult.
• Resistance Measurement and Continuity Testing: The DCM320’s capacity to measure resistance up to 20 MΩ caters to diverse diagnostic needs. Additionally, the continuity buzzer, which operates up to 20 Ω, facilitates quick and efficient circuit testing.
• Safety Assured: Adhering to IEC 61010 CAT III 600 V safety standards, the DCM320 provides high-level protection, ensuring user safety during operation. This compliance underscores its reliability and quality assurance.

Durability and Design

The Megger DCM320 is crafted to withstand demanding job environments. Its durable construction includes the ability to endure a 1.2 m drop onto a hard surface, making it a robust choice for fieldwork. Despite its ruggedness, the device maintains a compact form factor, making it easy to carry and handle.

User Experience

In addition to performance, the DCM320 is user-centric, featuring an intuitive interface for straightforward operating procedures. Supplied with high-quality test leads and a carry case, it ensures that users have everything they need from the get-go. This product is engineered to cultivate a seamless experience from preparation to testing.

Applications

The Megger DCM320 is ideal for electrical contractors, maintenance professionals, and system inspectors who demand precision and efficiency in their diagnostic tools. Whether you are installing new systems or diagnosing existing ones, the DCM320 is engineered to meet the highest professional standards, offering both reliability and ease of use.

Invest in the Megger DCM320 Clamp Meter for an unmatched experience in electrical testing and inspections. Experience the convenience of a comprehensive tool designed to enhance your workflow with precision and safety.

The post Megger DCM320 Digital Clamp Meter – 400A AC/DC, 20 MΩ Voltage & Resistance Tester with Continuity Buzzer, IEC 61010 CAT III 600V Rated appeared first on rapid-tech.