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