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RESISTIVE CURRENT LEAKAGE CLAMP TESTER

Ior (RESISTIVE) LEKAGE CURRENT MEASUREMENT

BACKGROUND

Nowadays, many harmonics and high-frequency current are contained to leakage current of grounding line and or other circuits due to spread of high-frequency electric apparatus with inverter, converter, etc. and the measured values by different instruments are not same even at the same measuring point.
Generally, leakage current contains the resistive component (Ior) which flows to the ground by insulation deterioration and also, the capacitive component (Ioc) which flows by electrostatic capacity caused from above high-frequency and harmonics.
The actual insulation deterioration should be related with only Ior but ordinary leakage clamp testers can measure only Io (vector between Ior & Ioc as under drawings) and cannot judge what kind of leakage current is flowing.

MEASURING METHODS FOR RESISTIVE LEKAGE CURRENT

There are mainly two methods for measuring resistive component of leakage current as followings:
1. Igr Method – Inputting a certain fixed low range frequency to the circuit by injection CT.
2. Ior Method – Measuring synchronous current based on the circuit voltage inputted to clamp tester.

We are adopting Ior method to all our Io/Ior Digital Clamp Testers (except for model MCL-400IR), as Igr method is very difficult to have injection CT in the actual measuring fields.
Our new models MCL-500IRV, 340IRV & MCL-800IRV have non-contact voltage sensors which enable more safely measurement without touching voltage terminals.
Also, model MCL-400IR has very unique method, detecting harmonics (5th & 7th) and measuring resistive component by calculations without voltage input.

M-340IRV

Mini Type, easy to hand carry

FEATURES

Integrated Non-contact Voltage Input Type Clamp Leaker.
*Safety: Available voltage input from the coated conductors (not touching voltage terminal)
*Convenience: Built-in LCD display combined with clamp CT.
It is getting more & more difficult to check the insulation conditions by ordinary Io leakage current due to spread of inverter appliances, etc.
By detecting resistive leakage current (Ior), management of insulation conditions can be made more accurately on the live lines

MCL-500IRV

Wide Range, measurable from mA to Line Current up to 500A

FEATURES

Integrated Non-contact Voltage Input Type Clamp Leaker.
*Safety: Available voltage input from the coated conductors (not touching voltage terminal)
*Convenience: Built-in LCD display combined with clamp CT.
It is getting more & more difficult to check the insulation conditions by ordinary Io leakage current due to spread of inverter appliances, etc.
By detecting resistive leakage current (Ior), management of insulation conditions can be made more accurately on the live lines

MCL-800IRV

Big Window CT, High Precision

FEATURES

Integrated Non-contact Voltage Input Type Clamp Leaker.
*Safety: Available voltage input from the coated conductors (not touching voltage terminal)
*Convenience: Built-in LCD display combined with clamp CT.
It is getting more & more difficult to check the insulation conditions by ordinary Io leakage current due to spread of inverter appliances, etc.
By detecting resistive leakage current (Ior), management of insulation conditions can be made more accurately on the live lines

MCL-400IR

FEATURES

  • Can measure the resistive leakage current (Ior) of the grounding lines and other electric circuit without voltage input.

Specifications

ParametersM-340IRVMCL-500IRVMCL-800IRVMCL-400IRV
Measuring FunctionLine Current
Leakage Current
Resistive Leakage Current
Line Current
Leakage Current
Resistive Leakage Current
Line Current
Leakage Current
Resistive Leakage Current
Line Current
Leakage Current
Resistive Leakage Current
Harmonics current and voltage
(Fundamental, 3rd, 5th,7th, 11th and 13th)
AC Voltage
Available Circuits for Ior Measurement1P/2W, 1P/3W, 3P/3W1P/2W, 1P/3W, 3P/3W, 3P/4W star connection1P/2W, 1P/3W, 3P/3W, 3P/4W star connection
CT Inside Diameterφ40mmφ40mmφ80mmφ40mm
AC Current Range10mA/100mA/60A40mA/400mA/4A/40A/500A10mA/100mA/1000mA/10AAC 0-40mA, 400mA, 4A, 40A, 300A,
AC 0~500V
Minimum Resolution0.001mA0.01mA0.001mA0.01mA
AccuracyRange/ Resolution/ Accuracy
I
60A/ 0.01A/
0 ~ 49.99A ±1.0%rdg±10dgt
50A ~ 59.99A ±3.0%rdg±10dgt
Io
10mA/ 0.001mA/ ±1.0%rdg±10dgt
100mA/ 0.01mA/ ±1.0%rdg±10dgt
Ior
10mA/ 0.001mA/ ±3.0%rdg±20dgt
100mA/ 0.01mA/ ±2.5%rdg±20dgt
Range/ Resolution/ Accuracy
I, Io
40mA/ 0.01mA/ ±1.0%rdg±10dgt
400mA/ 0.1mA/ ±1.0%rdg±10dgt
4A/ 0.001A/ ±1.0%rdg±10dgt
40A/ 0.01A/ ±1.0%rdg±10dgt
500A/ 0.1A/ ±1.0%rdg±3.0%FS
Ior(direct)
40mA/ 0.01mA/ ±1.5%rdg±15dgt
400mA/ 0.1mA/ ±1.2%rdg±15dgt
4A/ 0.001A/ ±1.2%rdg±15dgt
Ior (non- contact)
40mA/ 0.01mA/ 0.40mA~3.99mA/ ±3.0%rdg±20dgt
4.00mA~39.99mA/ ±1.5%rdg±15dgt
400mA/ 0.1mA/ 4.0mA~39.9mA/ ±3.0%rdg±20dgt
40.0mA~399.9mA/ ±1.5%rdg±15dgt
4A/ 0.001A/ 0.040A~0.399A/ ±3.0%rdg±20dgt
0.400A~3.999A/ ±1.5%rdg±15dgt
Voltage
500V/ 0.1V/ ±1.0%rdg±8dgt
Range Resolution Display Accuracy
I, Io
10mA/ 0.001mA/ ±1.0%rdg±10dgt
100mA/ 0.01mA/ 1±1.0%rdg±10dgt
1000mA/ 0.1mA/ ±1.0%rdg±10dgt
10A/ 0.001A/ ±1.0%rdg±10dgt

Ior
(direct) 10mA/ 0.001mA/ ±1.5%rdg±20dgt
100mA/ 0.01mA/ ±1.5%rdg±15dgt
1000mA/ 0.1mA/ ±1.5%rdg±15dgt
10A/ 0.001A/ ±1.5%rdg±15dgt
Ior (non contact) Single Phase
10mA/ 0.001mA/ ±2.0%rdg±20dgt
100mA/ 0.01mA/ ±2.0%rdg±15dgt
1000mA/ 0.1mA/ ±2.0%rdg±15dgt
10A/ 0.001A/ ±2.0%rdg±15dgt
Ior (non contact) Three Phase
10mA/ 0.001mA/ 0.500mA~4.999mA ±3.0%rdg±40dgt
5.000mA~9.999mA ±2.0%rdg±15dgt
100mA/ 0.01mA/ ±2.0%rdg±15dgt
1000mA/ 0.1mA/ ±2.0%rdg±15dgt
10A/ 0.001A/ ±2.0%rdg±15dgt
Voltage
500V/ 0.1V/ ±1.0%rdg±8dgt
Measuring Function/Range/Resolution/Accuracy
AC Current/40mA/0.01mA/±1.0%rdg±8dgt
AC Current/400mA/0.1mA/±1.0%rdg±8dgt
AC Current/4A/0.001A/±1.0%rdg±8dgt
AC Current/40A/0.01A/±1.0%rdg±8dgt
AC Current/300A/0.1A/±1.0%rdg±1%FS
AC Voltage/500V/0.1V/±1.0%rdg±8dgt
Fundamental, 3rd, 5th, 7th : 1%rdg±5dgt±AC current and voltage accuracy
11th and 13th Harmonics : 2%rdg±5dgt±AC current and voltage accuracy
(Min. fundamental input current : more than 2% of each current)
DisplayLCD, max.9999 reading with annunciatorLCD, max.9999 reading with annunciatorLCD, max.9999 reading with annunciator3.5 digit LCD, max. reading of 4000
AC ConversionSuccessive approximation methodSuccessive approximation methodSuccessive approximation method Average sensing rms reading
Input Frequency 45~65Hz (by switch for 50/60Hz)50/60Hz ( Auto)50/60Hz (manual change)45-65Hz
Measuring methodClamp CT (in case of Ior, based on voltage standard)Clamp CT (in case of Ior, based on voltage standard to be inputted directly or by non-contact voltage sensorClamp CT (in case of Ior, based on voltage standard to be inputted directly or by non-contact voltage sensorDual slope integration mode
Over range indication"OL" mark on LCD"OL" mark on LCD"OL" mark on LCD"OL" mark on LCD
Low battery indication"Battery mark" on LCD"Battery mark" on LCD"Battery mark" on LCD"Battery mark" on LCD
Auto power off functionApprox. 10 minutes later after final key operationApprox. 10 minutes later after final key operationApprox. 10 minutes later after final key operationApprox. 10 minutes later after final key operation
Data hold indication"DH" mark on LCD"DH" mark on LCD"DH" mark on LCD"DH" mark on LCD
Sampling RateTwo Times/SecondTwo Times/SecondTwo Times/SecondTwo Times/Second
Operating Circuit VoltageLess than AC500V (Isolated Electric Wire)Less than AC500V (Isolated Electric Wire)Less than AC500V (Isolated Electric Wire)Less than AC 500V
Withstanding VoltageAC 2200V/1 minute between CT core and gripAC 2200V/1 minute between CT core and gripAC 2200V/1 minute between CT core and gripAC 2200V, 1minute
Influence of external magnetic fieldLess than 5mA (nearby 100A conductor)
Operating Temp. & Humidity Range0~50℃ Less than 85%RH (w/o condensation)0~50℃ Less than 85%RH (w/o condensation)0~50℃ Less than 85%RH (w/o condensation)0℃~40℃, < 80%RH ( Without condensation )
Storage Temperature -10~60℃, < 80%RH (without condensation) -10~60℃, < 80%RH (without condensation) -10~60℃, < 80%RH (without condensation) -10~60℃, < 70%RH (without condensation)
Power SupplyAAA Size Alkaline Battery x 3AAA Size Alkaline Battery x 3AAA Size Alkaline Battery x 31.5V ("AAA" sixe, um-4)x3 or AC adaptor (Option)
Power consumption10mA (approx. 80h for continuous use)13mA (approx. 48h for continuous use)14mA (approx. 48h for continuous use)Approx. 8mA (Approx. 60 hours continuous)
Dimension/WeightW44×H197×D24mm Approx.210gW70×H223×D34mm Approx.440gW71×H315×D37mm Approx.750g70(W)x223(H)x34(D)mm Approx. 440g including batteries
AccessoriesCarrying Case, Non-contact Voltage Sensor, Instruction ManualCarrying Case, Non-contact Voltage Sensor, Direct Voltage Input Sensor, Instruction ManualCarrying Case, Non-contact Voltage Sensor, Direct Voltage Input Sensor, Instruction ManualCarrying Case…..1, Instruction Manual…..1
Batteries…..3 (installed into the instrument)
Dimension/WeightW44×H197×D24mm Approx.210gW70×H223×D34mm Approx.440gW71×H315×D37mm Approx.750g70(W)x223(H)x34(D)mm Approx. 440g including batteries