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The heart of every VTVM is the balanced bridge circuit. ), and the execution of this basic principle does not seem to have changed. You should note that the input resistance is constant though out the range switch.Now the voltage divider action results in a voltage reading of 49VDC, which is pretty close to the ‘expected’ 50VDC.Hopefully, you can understand how much this accuracy was appreciated some sixty years ago.Next, use your isolation probe, and set your VTVM DC voltage scale to ‘150’.
Connect the isolation probe to the ‘open’ end of the coupling capacitor, and the ground clip to the chassis.
Today’s DMM can achieve comparable accuracy, yet there are still instances where a VTVM is the only meter to have!