BOURNS 4030-01

Bourns® Model 4030-0x Surge Protector Test Set is a handheld, battery-operated tester designed to measure the clamping voltage and DC breakdown voltage of most surge protective devices. The Model 4030-0x is suitable for testing gas tubes, carbon gaps, MOVs, Zener and avalanche diodes and thyristor devices, both as components and as complete protectors. The Model 4030-0x is a true slow-rise tester because it does not use a pulse transformer. It contains unique test circuitry and a precise 1 mA detector. As soon as 1 mA is  conducted through clamping type devices such as MOVs and avalanche diodes, the control circuit removes the test voltage from the output terminals and displays the  clamping voltage on the meter. A low energy capacitive circuit will discharge through crowbar type protectors such as gas tubes and carbon blocks, and trigger the detector. The breakdown voltage will be displayed and the test voltage removed.