Designed for ESD testing, the 149-03 and -04 digital high-voltage meters can measure up to 40 and 60 kV, respectively, and feature an input impedance of 100 GW. The portable instruments operate from ...
Normally, in a digital voltmeter, high input impedance of the preamplifier stage is protected against very high voltages by two diodes. One of them is connected to the positive terminal and the other ...
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