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FET voltmeter sought

Suppose a fellow wished to buy a high input impedence voltmeter rather accurate for low voltages (< 10v, say) but not expensive. Any recommendations?

Reply to
Peter Percival
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Peter Percival schrieb:

What do you mean with "high"? Digital multimeters normally have an input impedance of 10 MOhms; the lowest measuring range is 0.2 volts.

Best regards

Reinhard

Reply to
Reinhard Zwirner

50 Mohms down to 0.01 volts. Is that too much to ask?
Reply to
Peter Percival

A 50 M precision series resistor (probably a series combination), measuring on the microamp range. You have 1 pA resolution there, which is 100 uV. You do have to watch the burden voltage, of course.

Cheers

Phil

Reply to
Phil Hobbs

Thank you.

Reply to
Peter Percival

If you want fairly cheap: HP 3478A has an input impedance of >100Gohm on it's 3VDC or less ranges. HP 3456A has an input impedance of >100Gohm on it's 10VDC or less ranges, but size is a bit large.

Reply to
JW

You could put a 40M resistor in series and divide the reading by 5.

0.002V x 5 = 0.01V So, I guess you would need a 4-1/2 digit multi meter. Or is that 3-1/2?

Mikek

Reply to
amdx

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