MEWOI-HT9920 Insulation Resistance Tester

• Adopting switching power supply principle, max constant current output 1.8mA and voltage output range 25~1000V,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 automatic 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.

SMPS design, low heat

Moisture-proof coating, low-temperature drift components

Sealed case, dustproof keys

• Constant current discharge method adopts voltage readback judgment to ensure no residual discharge every time.

• Traditional discharge method, using timed discharge, residual voltage is uncertain.

• Traditional discharge method, the relay works under high voltage for a long time, which is easy to cause contact burning, and eventually lead to poor contact.

• Constant current discharge method, the discharge current is constant, will not cause instantaneous overpower or arc drawing. This method has a high reliability.

The current sampling part in the traditional instrument cannot be isolated from the ground with high voltage and high insulation impedance. When the DUT or test tool and the ground have poor insulation, the test stability and accuracy are affected by the ground current loop and directly cause the test to fail.
HT9920 insulation tester simulated the high voltage and high insulation impedance isolation between the tester and the ground, eliminating the test problems caused by the ground loop current, so it is particularly suitable for automatic test occasions with complex wiring and tooling.