Using an operational amplifier with FET, this voltmeter has a high input resistance. The circuit has 4 scales and can use a common multimeter on the current scale instead of the original instrument. We found this circuit in a 1982 documentation.
Using an operational amplifier with FET, this voltmeter has a high input resistance. The circuit has 4 scales and can use a common multimeter on the current scale instead of the original instrument. We found this circuit in a 1982 documentation.