I believe that the FET input analog meters have very high impedance, but I
don't know the specific range for any specific model.

Adding a high voltage probe to a meter's input will increase the impedance.
For example, the Beckman 300 series DMMs have an input impedance of 22 M
ohm, and the high voltage probe increases it by x 1000.
The HV probe sheet lists the input resistance as 1000 M ohm for the 50 kVDC
HV-211 probe.

There are other multiplier probes for meters to increase the DC input range
of meters to the 5 to 10 kV range. These would also produce a similar input
impedance increase.

A typical combination analog meter built into the HV probe might be a less
accurate instrument.

Cheers
WB
..................

"Norm Dresner" wrote in message
...
I have an HP200CD that needs some loving care. The manual says to measure
the difference in the voltage between two different points in the
circuit --
it shouldn't be all that much but the voltages between these points and
ground is in the hundreds of volts range. The manual also says that I
should be using a meter with 220M ohm or greater input impedance to make
the
voltage measurements. Any suggestions where such a beast could be
bought/rented/stolen?

TIA
Norm





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