HT9920 Insulation Resistance Tester

• Adopting switching power supply principle, max constant current output 1.8mA and voltage output range 10~1000V, with step 1V
• High test speed, minimum test cycle only 50mS
• Unique anomaly detection function, the instrument can detect the test leads abnormality and the abnormal contact of the measured object, avoiding the open circuit misjudgment
• Short-circuit detection function effectively detect short-circuit conditions and avoid
• direct application of high-voltage breakdown of defective products and to misjudgment
• Automatic discharge, the instrument will automatically discharge after the test completed. HT9920 adopts non-contact constant current discharge, fast, efficient and reliable
• Various interfaces are equipped, external I/O, analog, LAN, RS232 interface
• Double-click trigger to prevent high-voltage electronic shock accidents caused by false triggers. Users can set the double-click action to trigger the test.
• Analog output. Analog output port of the instrument output results. After each test is completed, output 0~4V analog voltage value corresponding to the test result. There are two types of voltage output, one is full range output and the other is single range output.
• Quickly charge and discharge the capacitive load
• Stable measurement without additional shielded wire.
• Parts of the device under test contact check function to avoid misjudgment in open circuit.
• Short circuit detection before test to prevent high voltage breakdown.
• Continuous test mode, PASS termination mode, FAIL termination mode, and forced termination mode.
• Various interfaces, suitable for pipeline sorting.

Cable detection function

Circuit principle

Each test end is divided into 2 test lines, and a constant current source is added between the test lines. When the DUT is short-circuited at the test end, the current source outputs a low level, otherwise it outputs a high level. Use in this way to check whether the test object or test line is in good contact.