Re: Very high input resistance voltmeter
Good idea, that. Back in the day when DAF96s needed their voltages measured, most service departments would have still been using Avo Model 7s! Or a proper valve voltmeter with a cathode follower input stage. I have some Heathkit VTVMs, but even they have a resistive input attenuator which fixes the resistance to a disappointing 10 Megohms on all DC ranges.
The Avo EA113 electronic multimeter offers a genuine 1 Megohm-per-volt sensitivity as standard, or 100 Megohms on the 100V range and above. The much older Avo Electronic Testmeter also has a very high input resistance.
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Phil
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