It is probably not a problem. The input impedance on the low voltage DC ranges is very high (over 10000 MEG ohms), so even 1 pico ampere of bias current would produce over 10mV of apparent input voltage with open terminals.
Try shunting a 10 MEG ohm resistor across the input and see what the DC voltage reading is.
--John Gord
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--- In hp_agilent_equipment@..., Michael Hong <mcllhns@...> wrote:
Hi everyone,
I just bought two 3456As from the same dealer off eBay.
Both of them have the same problem. When they are turned on, the number drift from low mV number and goes up to -8.nnnnn for one meter and the other meter to -6.nnnn. And then float around there. When I short the leads at Ohm or Volt setting, they show the near zero and when disconnected, go to their the number again.
I expect they stay at very low mV or zero without any input. What seems be the problem?
Thank you.
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