Equipment Substitution for Diff Voltmeter

[griff61]

I'm a bit hazy on this one, can anyone help me with what can be substituted for a Differential Voltmeter? I have a single item that calls for one. Don't see buying one any time soon, but I'd sure like to avoid sending it elsewhere.

[K-Rock]

Depends on the application, but if loading is not an issue for your application, then a good bench multimeter should serve your purpose...

[Hoopty]

I used to use the 3458 in place of the diff voltmeter alot, but k-rock is right, check the impedance requirements.  The extremely high (GOhm?) input impedance was the main reason for using one.

[Hoopty]

Just looked up the specs on 3458.  The input impedance for 10V range and below is >10GOhm.  100V & 1000V ranges are 10 MOhm.  So it should be a suitable in any case as long as you use the right range.

[±0.03 PPM Drifter]

You can use a null detector with a separate DC Standard if you want lots of High impedance. I use a Fluke 8508A Referance multimeter sometimes and an HP34401A on 10G input impedance, for 1V RNG or less, when I don't want to put un-needed usage on the 8508A. 3458A's are nice also. You also can put calibrated a 1G or 10G resistor in series with a 10M ohm DMM, taking into acount for the impedence of the DMM.

[ATEC]

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[Newbie]

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