Experts point out that if the voltage regulator is powered on during the AC withstand voltage test, the voltmeter will indicate. However, if the ammeter displays an abnormal reading at this time, it may indicate a short circuit on the output side of the voltage regulator. Check if the ground rod was forgotten to be removed. There are many abnormal phenomena in communication withstand voltage testing. Let's listen to the expert's analysis:

Adjust the voltage regulator, the voltmeter shows no indication, which may be due to poor contact of the carbon brush or disconnection of the primary winding and measuring winding of the transformer.  

In the AC withstand voltage test, a sudden increase or decrease in the reading of the ammeter or a sudden decrease in the reading of the voltmeter is a sign of breakdown of the tested product. The zinc oxide lightning arrester characteristic tester is easy to operate and can measure the full current, resistive current, harmonics, active power, and phase difference of the zinc oxide lightning arrester. The large screen can display real voltage and current waveforms.  

Experts point out that during the boost or withstand voltage stage, if the discharge sound is "ch -", "squech ch", or a very dull sound, the reading of the ammeter immediately exceeds the large deflection reading, which is often caused by solid insulation creeping. of If it is a noise like frying beans and the ammeter reading is stable, it may be a suspended metal component discharging to the ground.  

In the AC withstand voltage test, if the air humidity or dirt on the surface of the tested product causes flashing and discharge, it should not be considered as unqualified. Before the experiment, the surface should be cleaned to determine if it is qualified. If the insulation layer of the enamel layer on the surface of the test sample is damaged, aged, or cracked, it is considered unqualified.

Wuhan UHV specializes in the production of series resonance (also known as AC/DC withstand voltage test device), engaged in the electrical measurement industry for many years. Its products have first-class quality and welcome customers to come and purchase.