Precision Hipot tester MICROTEST 7631 (8 Channel)

Price: Contact

Model 7631
Manufacturer MICROTEST
Power supply 90Vac-264Vac
Weight 15 Kg
Size 435 x 145 x 500 mm
Condition Stocking
Warranty 12 months

Precision Hipot tester MICROTEST 7631 (8 Channel) provides 8 sets of testing channels and can be optionally equipped with the 7508/7516 multi-channel scanning box, allowing up to 72 sets of testing channels.

I. Specification of Hipot tester MICROTEST 7631 (8 Channel)

  • Precision Hipot tester MICROTEST 7631 (8 Channel) is a 3-in-1 test instrument that supports AC withstand voltage, DC withstand voltage, and insulation resistance testing functions.
  • MICROTEST 7631 (8 Channel) has a maximum AC withstand voltage of 5000V with a leakage current of 30mA, a maximum DC withstand voltage of 6000V with a leakage current of 10mA, and a maximum insulation resistance of 12000MΩ.
  • Hipot meter supports PC connection software for remote programming and storage of test data. It can also be linked to a barcode scanner for barcode scanning, facilitating production traceability management.

Features of Hipot tester MICROTEST 7631:

  • 8 Channels
  • Hi pot ACW 5KV/30mA
  • Hi pot DCW 6KV/10mA
  • Insulation 1KV/12000MΩ
  • Arcing detection
  • True RMS measurement circuit
  • Measuring Time (0.1 ~ 999s)
  • Adjustable ramp time (0.1 ~ 10s)
  • Safety Switch(INTER LOCK)
  • Option PC Link Software
  • Support AC 5000V, DC 6000V, Insulation Resistance 12GΩ
  • 7508/7516 (8/16 channels) expansion box can conjunction
  • with 7631 for expanding channels to meet the vehicle wire or PCB testing
  • Support Remote control signal.


  • Transformers, motors, capacitors, inductors, wires and wave filter.

II. Main features of Precision Hipot tester MICROTEST 7631 (8 Channel)

MICROTEST 7631 (8 Channel) HI-POT tester safety mechanism:

  • Output safety switch.
  • Switch on the inter lock before testing.

Instrument will stop testing when open loop happened.

Synchronization display INTER LOCK.


Safety certification testing items:

  • AC Hi-pot
  • DC Hi-pot
  • Insulation resistance
  • Current leakage.


Multi-channel programmable test function/ Why do we need multi-channel programmable test function?

  • There are many safety standards that request withstanding voltage test. Testing time is usually more than one minute. Furthermore, some product line request 100% inspect the product.
  • Customers hope that the multiple product can be inspect in the same time to reduce the time and fixture and increase the efficiency.
  • Precision Hipot tester MICROTEST 7631 (8 Channel) offer expansion option for multi-product testing.
Precision-hipot-tester-microtest-7631-8-channel Precision-hipot-tester-microtest-7631-8-channel


AC/DC Withstanding voltage test:

  • Difference between AC and DC

AC Hipot Test

Most DUT have parasitic capacitance. With AC test, might not able to charge the parasitic capacitance. Therefore, this will create constantly current go through.

DC Hipot Test

The parasitic capacitance will be charged under DC hi-pot test. Therefore, the current will reduce to almost 0. 

  • Advantages for AC Test

AC Hipot Test

AC test is same as our normal usage electricity. Also, AC is able to do positive and negative polarity test.


AC test won’t charge the parasitic capacitance on the DUT, so it won’t create instantaneous peak current. Do not need to discharge the DUT after testing.

DC Hipot Test

The parasitic capacitance on DUT has been charged under DC test, so the rest leakage current is the real current from DUT.

  • Disadvantage of AC/DC Hi-pot test

AC Hipot Test

If the DUT has huge parasitic capacitance, the current we detect will bigger then the actual current.

To fulfill the necessary current for the capacitance of the DUT, the output current is much more than DC test. This is danger for the operator.

DC Hipot Test

Testing Voltage has to increase from 0.

The higher parasitic capacitance has, the more time it needs for DC voltage to increase. The voltage increase slower when it goes up. However, if the charging current is too high, it may cause the misjudgment for the instrument.

The discharge process is necessary after DC hi-pot test. 

DC test can only do the single polarity test. 


Hi-pot test time:

  • The testing voltage is refer to the condition of DUT while doing Hi-pot test. If the voltage setting is too low, the insulation material defect might not be detected. If the voltage setting is too high and the testing time is too long, it may cause the permanent damage for the material.
  • Normally setting for the safety standard.

Formula  →Testing Voltage= DUT recommend voltage × 2+1000V

EX : DUT standard :240V    →Setting test voltage:1480V.

Common way to safe time for testing:

  • Testing time for most products is 60s. If there are more than one test on one item, it will cost a lot of time. This will lower the efficiency og the product line.
  • Therefore, the product line usually shorter the testing time to 1~2 sec. and higher 10%~20% testing voltage.


Insulation resistance & Arc detection:

What is Insulation resistance test?

  • VDE and TUV safety standard request insulation resistance test for some specific product before hi-pot test. The reason is to make sure the insulation will not be damaged while doing hi-pot testing. Insulation resistance test is the key item to evaluate the material.
  • Hi-pot test is judge by leakage current, but IR test is judge by resistance, and usually it’s higher than 1 MΩ. It tests the DUT’s resistance between both terminal.

Why do we need to do IR test?

  • Confirm the performance of the structure of the insulation.
  • The insulation structure should have higher insulation resistance rate by using better material.
  • For the insulation material, the protection against electric shock of the switch must be guaranteed.
  • Confirm the insulation structure can pass the reliability test(heat durability, insulation)
  • The importance of insulation resistance.
  • Before assemble the product, IQC has to do the IR test for every components, such as switches, transformers, resistors, capacitors, inductors, PCB, wire or cable to make sure the quality.

Leakage current test?

→Measuring Tiny AC Leakage Current

  • DUT has tiny parasitic capacitance. This characteristic will create leakage current by resistance. Capacitor is a resistance component under AC voltage. This may cause the test result include the leakage current inside the instrument. If the DUT has low leakage current, we must consider capacitance , frequency, and the voltage we put.

Arc detection?

  • The surface or interior of the insulation material might discharge under high voltage test. Because of the lost of insulation performance, DUT may have temporary of discontinuity discharge.
  • Because that temporary discharge can’t be judge by leakage current, so Hi-pot tester will judge the defect product by the changing rate of testing voltage or leakage current.
  • Arc test is a geometric not a constant test. Also, the detection will be affect by the wire’s impedance or capacitance between the detectors. The rate of change of the current will be affect in the Arc detection.


Technical specifications of Hipot testing equipment MICROTEST 7631 (8 Channel)



Test Channel


AC Output Voltage


DC Output Voltage


Insulation Resistance


Expansion box

8 Chnnels

16 Channels




AC Hipot

Output Voltage


Voltage Resolution


Voltage Accuracy

 ±(3% of setting+5V)

Rated Current (Max.)


Upper Leakage Current


Leakage Current Resolution


Leakage Current Accuracy

 ±(3% of reading +10uA)

Arcing Detection

Detect gears from 0-20 (1 is the most sensitive)

DC Hipot

Output Voltage


Voltage Resolution


Voltage Accuracy

 ±(3% of setting+5V) 

Rated Current (Max.)


Upper Leakage Current


Leakage Current Resolution

 ±(3% of reading +10uA)

Leakage Current Accuracy


Arcing Detection

Detect gears from 0-10 (1 is the most sensitive)

Insulation Resistance

Output Voltage


Voltage Resolution


Voltage Accuracy

  ±(3% of setting+5V) 

Insulation Resistance Range


IR Resolution


IR Accuracy

100-500V, 1-1000MΩ (±5% of reading+1MΩ)
500-1000V, 2-12000MΩ (±5% of reading +10MΩ)

Measuring Time


Ramp Time


Measuring Time Resolution




PLC Remote Control


PLC Output Signal

PASS、FAIL、HV Output、Testing

Safety Switch

When testing, you need to short-circuit the INTER LOCK on the rear of the instrument to output the test voltage

List Mode

Each group contains up to 32 steps

Built-in Storage

15sets setting files

USB Host Storage

Storage setting files and update firmware

Power Supply


Frequency:50/60Hz ±5%

Power consumption






435x145x500 mm (W*H*D)


15 Kg


RS-232、Remote、USB Host、USB Device、EXT. I/O


4.3″ TFT LCD (480*272 )

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