100-500V, 1-1000MΩ (±5% of reading+1MΩ) 500-1000V, 2-12000MΩ (±5% of reading +10MΩ)
Measuring Time
0.1-999s
Ramp Time
0.1-10s
Measuring Time Resolution
0.1s
SYSTEM
PLC Remote Control
Test、About
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
Voltage：90Vac-264Vac
Frequency：50/60Hz ±5%
Power consumption
300VA
Environment
Temperature：5℃-40℃
Humidity：0-80%RH
Dimension
435x145x500 mm (W*H*D)
Weight
15 Kg
Interface
RS-232、Remote、USB Host、USB Device、EXT. I/O
Display
4.3″ TFT LCD (480*272 )
MICROTEST 7631 is a 3-in-1 test instrument that supports AC withstand voltage, DC withstand voltage, and insulation resistance testing functions. It 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. It 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. It 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.
Application
MICROTEST 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.
Hi-pot Tester offer expansion option for multi-product testing.
AC/DC Withstanding Voltage Test
Difference between AC and DC
AC Hi pot 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 Hi pot 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 Hi pot 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 Hi pot 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 Hi pot 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 Hi pot 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.
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.
DCT’s Skilled Management Team has more than twenty-five years of experience and expertise in the local business environment, coupled with a highly motivated group of employees, positions us as the preferred supplier among the major customers in the industry.
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