Anyone who has spent a day fault-finding around a switchboard knows the routine — swap leads for the insulation tester, swap again for the earth tester, then reach for the multimeter to confirm the circuit’s dead. Three instruments, a tangle of leads, and a real risk of triggering an RCD trip the moment a small test current sneaks down the earth path. On a busy commercial fit-off or a rooftop solar job, that lost time adds up fast, and a nuisance trip can mean climbing back into the roof space to reset a board.

For Australian trades working to AS/NZS 3000, insulation resistance and earthing checks aren’t optional — they’re the backbone of safe verification. The challenge has always been doing them quickly, accurately and without dragging a kit bag of separate testers up a ladder.

The Solution: Three Tests, One Pocket-Sized Probe

The KEW 6041BT collapses that whole workflow into one palm-sized tester you can hold like a pen. Press the tip to the conductor, hit TEST, and you’ve got insulation resistance, earth resistance or voltage at a glance. KYORITSU built it around a simple idea — get the technician released from test-lead hassles — and the result is an instrument that’s genuinely faster to use on real jobs.

It measures insulation resistance across four ranges (50, 125, 250 and 500 V), checks earth resistance using a simplified 2-pole method, and reads True RMS voltage up to 440 V AC/DC with automatic AC/DC detection. A built-in illuminance sensor wakes the LED light and backlight in dim plant rooms, and glow-in-the-dark switches help you find the controls when you’re working in a dark roof cavity. Crucially, the earth function uses a test current of 2 mA or less, so you can take earth readings on live installations without unintentionally tripping the RCD.

Key Features and What They Mean on the Job

• All-in-one probe design – Insulation, earth and voltage testing in a single 230 g body you operate one-handed. Less gear in the bag, fewer leads to swap, faster results between points.
• Anti-trip earth testing (≤2 mA) – The low test current on the earth function avoids unintentional RCD trips, so you keep measuring on live boards without resetting protection devices.
• Live circuit warning – On both insulation and earth functions, an audible alert plus a red LCD backlight flag dangerous voltage (30 V or higher) and lock out measurement until it’s safe. A built-in safeguard before you apply test voltage.
• True RMS voltage to 440 V – Accurate readings on distorted waveforms common around VSDs, inverters and switching loads, with AC/DC auto-detection so there’s one less setting to get wrong.
• Comparator function with audible pass/fail – Set a threshold and the tester beeps and lights up when a reading falls outside it, so you can run repetitive checks without squinting at every value.
• Auto-discharge – Stored charge on the circuit under test is automatically bled off after an insulation test, protecting you and the equipment.
• Bluetooth 5.0 to KEW Smart Advanced – Save readings straight to your phone or tablet, capture location data, and drop results into the supplied Excel report template — paperwork done before you’ve packed up.
• App-based customisation – Disable ranges or functions you don’t use, change the maximum displayed value, or adjust comparator thresholds to suit your workflow and reduce the chance of accidental high-voltage output.
• Replaceable metal tips – Standard, long and moulded tips are available, plus an optional L-shaped probe for awkward, high or recessed terminals.

Technical Specifications

Specifications are drawn from KYORITSU’s published product data. If you need a full datasheet or instruction manual before purchasing, get in touch and we’ll send it through.

Who It’s For – Real-World Applications

Electrical contractors and sparkies: Run insulation resistance and earth checks during fit-off, fault-finding and periodic verification without lugging separate testers. The probe design and live-circuit lockout make point-to-point testing around a switchboard quick and safe.

Solar PV installers: Carry one compact instrument up to the roof for quick insulation and voltage confirmation on DC and AC sides, with True RMS handling inverter-related waveform distortion. Bluetooth logging means commissioning notes are captured on the spot.

Industrial and facility maintenance teams: Keep a 6041BT in the toolbox for fast spot-checks on motors, control panels and machinery. The anti-trip earth function lets you verify earthing on running plant without dropping protection, and the comparator’s audible pass/fail speeds up repetitive routine inspections.

HVAC and building services technicians: Confirm circuits are dead, check insulation on plant wiring, and verify earthing on rooftop and plant-room equipment — all from one pocketable tool with a light built in for dark mechanical spaces.

TAFE, RTOs and training departments: A safe, simple, app-connected tester that teaches insulation, earth and voltage testing fundamentals, with reporting features students will meet in the field.

What is the KYORITSU KEW 6041BT used for?

The KYORITSU KEW 6041BT is a palm-sized 3-in-1 tester used to measure insulation resistance (50/125/250/500 V), earth resistance (2-pole method, up to 2000 Ω) and True RMS voltage (up to 440 V AC/DC). Electricians, solar installers and maintenance technicians use it for fast, compliant safety testing on site without carrying three separate instruments.

Does the KEW 6041BT prevent RCD nuisance tripping?

Yes. On the earth resistance function the KEW 6041BT uses a test current of 2 mA or less, which is low enough to take earth readings on live installations without unintentionally tripping RCDs. This lets technicians measure on energised boards without resetting protection devices.

Can the KEW 6041BT measure earth resistance without driving stakes into the ground?

Yes. The KEW 6041BT is a simplified earth resistance tester that uses the 2-pole measurement method with existing low-resistance earth systems — such as buried metal water pipes, the common earth of the commercial supply, or a building’s lightning electrode. It’s designed for situations where auxiliary earth stakes can’t be driven, like urban or concrete sites.

Is the KEW 6041BT suitable for AS/NZS 3000 insulation testing?

The KEW 6041BT provides a 500 V DC insulation test range and reads insulation resistance up to 200 MΩ, supporting the insulation resistance verification carried out under the AS/NZS 3000 Wiring Rules. It is rated CAT IV 150 V / CAT III 300 V and built to the IEC 61557 series that underpins Australian testing practice. Always follow the current edition of AS/NZS 3000 and your verification procedures.

Does the KEW 6041BT connect to a phone?

Yes. The KEW 6041BT has Bluetooth 5.0 and works with the free KEW Smart Advanced app for Android and iOS. You can view live readings, save measured data in CSV, capture location information, and transfer results into an Excel report template to generate test reports on site.

How accurate is the KEW 6041BT?

Insulation resistance accuracy is ±2% rdg ±2 dgt in the first effective range, earth resistance is ±3% rdg ±5 dgt, and voltage is ±1% rdg ±4 dgt on AC (True RMS). These tolerances make it dependable for routine compliance pass/fail decisions.

The post KYORITSU KEW 6041BT Insulation Earth Tester | Bluetooth appeared first on rapid-tech.

• Real time measurements can be transferred, shown and saved on Android device (up to 100 measurements)
• Saved data includes measurement, GPS location and date & time Easy to check on map “When” and “Where” the measurement was made
• Comparator function on Android device informs when the measured value is lower/higher than the preset value

Earth /Ground resistance and Leakage current measurement functions
• The earth resistance from 0.05 to 1500 Ω can be measured without the auxiliary earth spikes in multi-earthing systems
• True RMS leakage or phase current readings from 0.1mA to 30.0A provides vital additional information in earthing networks
• Filter function offers increased immunity to electrical noise and a Noise mark appears in excessively high noisy environments

Measurement principle (Why Earth Resistance can be measured by only Clamping it)

This instrument can measure the earth resistance to earth in multi-earthed system. Let’s regard earth resistance under test as Rx, and the other earth resistances as
R1, R2, …Rn.

Of these earth resistances, R1, R2, …Rn can be considered that they are connected in parallel and can be regarded as a combined resistance Rs. The Rs can be regarded small enough against Rx since a combined resistance consists of several resistances. Following is an equivalent circuit diagram of this circuit

Kyoritsu 4202 Specifications

The post KYORITSU 4202 Earth Clamp Tester appeared first on rapid-tech.

It is capable of measuring earth resistance levels between a range of 0.05 and 1200Ω with high accuracy, it can also be used to gain a reading of AC current levels. The KYORITSU 4200  includes large jaws which are designed for clamping directly onto a targeted testing application.

Calibration of the Kyoritsu 4200 can be checked before taking measurements by using the supplied Test Fixture/Resistor.

With built in noise checking, the KYORITSU 4200 Digital TRMS Earth Resistance Clamp is able to filter out noise problems and maintain accurate results. These results are also able to be stored directly on the tester (it features memory for 100 readings) and other additional features unique to this earth resistance clamp meter include a buzzer function, data hold and a backlit screen.

KYORITSU 4200 Digital TRMS Earth Resistance Clamp Features:

• The earth resistance from 0.05 to 1500Ω can be measured without the auxiliary earth spikes. (The Multiple Earthing System.)
• True RMS – Accurate true RMS readings of AC current including distorted waveform from 1mA to 30.0A
• Noise Check Function – A function to detect current, which effects on an earth resistance measurement and display “NOISE” mark on the LCD.
• Memory function  – Save and display up to 100 measurement data.
• Data hold function / Buzzer function / Back light function
• Compliant with Safety Standards of IEC 61010-1 : CAT IV 300V Pollution degree2

..

KYORITSU 4200 Digital TRMS Earth Resistance Clamp Specifications:

The post KYORITSU 4200 Digital TRMS Earth Resistance Clamp appeared first on rapid-tech.

• High test current up to 80mA yielding resolution of 0.001Ω on 2Ω range.
• Advanced Filtering method (based on FFT Fast Fourier Transform) reduces noise interference for obtaining stable measurements.
• Automatic and Manual selection of the Test Current Frequency in four bands (94/105/111/128Hz). In Automatic mode, KEW 4106 will select the most suitable Frequency.
• Several sub-results can be shown on the display: Resistance of the Auxiliary Earth Spikes, Frequency of Test Current, Voltage and Frequency of Interference (noise), Residual Resistance Rk, etc.
• Warning for excessive noise and high Auxiliary Earth Spikes resistance.
• Large Graphic Display with backlight for readings in poorly illuminated areas.
• Up to 800 measurement results can be saved in the memory and recalled on the display.
• The stored results can be transferred to a PC using the “KEW Report” software and a USB adaptor (Model 8212-USB) which are included.
• Robust design with IP54 protection.

Earth Resistance Measurements with 4, 3 and 2 Wires

Kyoritsu 4106 Earth & Ground Resistance Tester Specifications:

The post Kyoritsu 4106 Earth & Ground Resistance Tester appeared first on rapid-tech.

Continuity Measurement 
With the Kyoritsu 6016 Multi Function Electrical Tester continuity testing can be carried out by use of the test button lockdown feature. A selectable buzzer gives instantaneous indication of continuity. Null facility eliminates the test lead resistance from the results, the nulled value is retained even if the instrument is switched off. Live circuit warnings are given by a flashing LED, buzzer and indication on the display.

Insulation Measurement 
The Kyoritsu 6016 Multi Function Electrical Tester has three selectable test voltages 250V, 500V and 1000V. An auto-discharge function ensures that circuits are not hazardous after testing. A red LED gives warning of high voltage output during testing and discharging of the circuit. In case of connecting to a live circuit, a live circuit warning is given by flashing LED, buzzer and indication on the display.

Loop Impedance Measurement
The Kyoritsu 6016 Multi Function Electrical TesterA patented (ATT) low current loop impedance test enables high accuracy loop measurements and quick testing without tripping RCD’s.
A high current alternative is selectable for even higher accuracy and instantaneous results. The subsequent test will default to the low current test, this saves any inadvertent tripping of the RCD. The KEW 6016 allows also for phase to phase loop tests.

PSC / PFC Measurement 
The Prospective Short Circuit Current (PSC) and Prospective Fault Current (PFC) are automatically calculated and shown on the display. As loop testing, the function has low and high test current options with the default to low current to avoid inadvertent tripping of RCDs.

RCD Measurement 
The KEW 6016 has a comprehensive RCD test feature for RCD type AC (Alternative Currents), RCD type A (Pulsating Direct Currents), General and Selective (delayed).
Measures at 1/2x, 1x, 5x of nominal RCD current. It also has Ramp Test and Auto test where all results are shown on one screen. Touch voltage limit can be selected for 25V or 50V depending on application

Earth Measurement 
Using the classical Volt-Amper method with two auxiliary earth spikes and without external power source. All test leads and spikes are supplied as standard accessories.

Phase rotation 
KEW 6016 can check the phase rotation of three phase lines with clear indication of the sequence on the display.

Voltage Measurement 
In addiction to the voltage measurement, this function gives also the Frequency of the voltage under test.

Kyoritsu 6016 Multi Function Electrical Tester Specifications:

Continuity
Range	20/200/2000Ω (Auto-ranging)
Open circuit voltage (DC)	5V±20% (*1)
Short circuit current	Greater than 200mA
Accuracy	±0.1Ω (0 – 0.19Ω) ±2%rdg+8dgt (0.2 – 2000Ω)
Insulation Resistance
Range	20/200MΩ (Auto-ranging)				20/200/2000MΩ (Auto-ranging)
Open circuit voltage (DC)	250V+25% -0%				500V+25% -0%	1000V+20% -0%
Rated current	1mA or greater @ 250kΩ				1mA or greater @ 500kΩ	1mA or greater @ 1MΩ
Accuracy	±2%rdg+6dgt (0 – 19.99MΩ) ±5%rdg+6dgt (20 – 200MΩ)				±2%rdg+6dgt (0 – 199.9MΩ) ±5%rdg+6dgt (200 – 2000MΩ)
Loop Impedance
Function	L-PE				L-PE (ATT)	L-N / L-L
Rated Voltage	100 – 260V 50/60Hz					L-N: 100 – 300V L-L: 300 – 500V 50/60Hz
Nominal Test Current at 0Ω External Loop: Magnitude/ Duration (*2)	20Ω: 6A/20ms 200Ω: 2A/20ms 2000Ω: 15mA/500ms				L-N: 6A/60ms N-PE: 10mA/approx. 5s	20Ω: 6A/20ms
Range	20/200/2000Ω (Auto-ranging)				20/200/2000Ω (Auto-ranging) (L-N < 20Ω)	20Ω
Accuracy	±3%rdg+4dgt(*3) ±3%rdg+8dgt(*4)				±3%rdg+6dgt (*3) ±3%rdg+8dgt(*4)	±3%rdg+4dgt (*3) ±3%rdg+8dgt(*4)
PSC (L-N / L-L) / PFC (L-PE)
Function	PSC				PFC	PFC (ATT)
Rated Voltage	100 – 500V 50/60Hz				100 – 260V 50/60Hz
Nominal Test Current at 0Ω External Loop: Magnitude/ Duration (*5)	6A/20ms				6A/20ms 2A/20ms 15mA/500ms	L-N: 6A/60ms N-PE: 10mA/approx. 5s
Range	2000A/20kA Auto-Ranging
Accuracy	PSC / PFC accuracy is derived from measured loop impedance specification and measured voltage specification
RCD
Function	X1/2		X1		X5	Ramp	Auto
Trip current setting	10/30/100/300/ 500/1000mA				10/30/ 100mA	10/30/ 100/300/ 500mA	Depending on the accuracy at each function. Measurement sequence: X1/2 0°→X1/2 180° →X1 0°→X1 180° →X5 0°→X5 180° Measurements with x5 are not carried out for RCDs with nominal current of 100mA or more.
Trip current Duration	2000ms		G: 550ms S: 1000ms		410ms	Goes up by 10% from 20% to 110% G:300ms/ S:500ms X10 times
Rated Voltage	230V+10%-15% 50/60Hz
Accuracy	AC Type: -8% – -2% A Type: -10% – 0%		AC Type: +2% – +8% A Type: 0% – +10%			AC Type: ±4% A Type: ±10%
	Trip time: ±1%rdg+3dgt
RCD (Uc)
Function	UC
Rated Voltage	230V+10% – 15% 50/60Hz
Range	100.0V
Test current	≤ 1/2IΔn (max150mA)
Accuracy	+5% – +15%rdg, ±8dgt
Earth
Range	20/200/2000Ω Auto-Ranging
Accuracy	20Ω: ±3%rdg+0.1Ω 200/2000Ω: ±3%rdg+3dgt (Auxiliary earth resistance 100±5%)
Phase Rotation
Rated Voltage	50-500V 50/60Hz
Remarks	Correct phase sequence: are displayed “1.2.3” and  cycle mark Reversed phase sequence: are displayed “3.2.1” and  cycle mark
Volts
Function	Volts					Frequency
Rated Voltage	25 – 500V, 45 – 65Hz
Measuring range	25 – 500V					45 – 65Hz
Accuracy	±2%rdg+4dgt					±0.5%rdg+2dgt

The post Kyoritsu 6016 Multi Function Electrical Tester appeared first on rapid-tech.

*1 For precision measurement, auxiliary earth resistance should be 100 Ω ±5% or less.
*2 At simplified measurement add ±0.10 Ω to the specified accuracy.
*3 Accuracy within the auxiliary earth resistance: ±5% rdg ±10 dgt.

The post Kyoritsu 4105DL Earth Tester appeared first on rapid-tech.

Regular testing of a grounding system is important for safety and protection of equipment. For example, corrosive soil with high moisture content can degrade ground rods and connections in existing systems and increase the resistance of the system.

Ground-resistance meters are used in conjunction with a variety of testing methods to troubleshoot intermittent electrical problems or as part of a regular maintenance plan.

Kyoritsu 4105A-H Earth Tester Features:

• Dust and drip proof.(designed to IEC 60529 IP54)
• In addition to the facility for precision measurement, test leads for simplified two wire easuring system also supplied as standard accessories.
(unit can be hung from the neck for simplified measurement)
• Designed to meet IEC 61010-1 safety standard.
• Capable of measuring earth voltage.
• Automatic warning when resistance of auxiliary earth spikes is in excess of tolerance.
• Small and lightweight. Shock resistant new case material.
• 2mA measuring current permits earth resistance tests without tripping earth leakage current breakers in the circuit under test.

Kyoritsu 4105A-H Earth Tester Specifications:

The post Kyoritsu 4105A-H Earth Tester – Hard Case Model appeared first on rapid-tech.

The Kyoritsu 4102A Earth Tester is designed so that the influence of the earth voltage and earth resistance of the auxiliary spikes are neglected under the earth resistance test. A low measuring current of 2mA allows earth resistance tests to be performed without tripping earth leakage current breakers. The Kyoritsu 4102A Earth Tester also has the ability to measure earth voltage, up to 30V AC.

Small and lightweight, the Kyoritsu 4102A Earth Tester is both dust and drip proof, conforming to the IP54 standard. The instrument is also shock resistant and designed to meet IEC 61010-1 safety standard. The Kyoritsu 4102A-H Earth Tester is supplied with earth resistance test leads, measurement probe, auxiliary spike kit, batteries, a shoulder strap and a hard carry case.

Kyoritsu 4102A-H Earth Tester Specifications:

The post Kyoritsu 4102A-H Earth Tester – Hard Case Model appeared first on rapid-tech.