Measuring Standard Cell Voltage

I would think so.

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Ed Bailen wrote in news: snipped-for-privacy@4ax.com:

No.(well,you will not -damage- the cell,just alter(screw-up) it's calibrated voltage)

You need a very hi-Z meter(=/> 100Meg) to avoid disturbing the voltage. SC's were originally measured using the differential voltage method,using a adjustable voltage source and a null meter.(At null,impedance is extremely high,theoretically infinite)

Jim Yanik wrote in news:Xns95198305EF2A1jyanikkuanet@204.117.192.21:

To add;you also will not have enough resolution on a DMM to get an accurate reading of the SC.

Thanks, Jim, I hadn't thought of that.

Ed Bailen

The small current drawn will greatly affect the accuracy of your measurement, and probably affect the cell. You should adjust a precision power supply such as the HP 6111 to the cell voltage, then put your microvolt meter between the cell and the 6111, and adjust until the

voltage

accurate

Depends om the DMM. High end 5-1/2 or 6-1/2 digit meters can measure microvolts.

"Watson A.Name - \"Watt Sun, the Dark Remover\"" wrote in news: snipped-for-privacy@corp.supernews.com:

I used to have one of these on my workbench at TEK-Orlando. I don't recall if it has a sufficiently high input-Z.

But a *NICE* DMM.