Electronics > Metrology
DMM does not stabilize when measuring resistance
pwnell:
I know this is user error, but why can I not get a stable reading from a 34465A DMM using 2 wire or 4 wire on a 1kohm resistor? I have 10 PLC, yet the value ranges from 0.982817 to 0.982920 … this seems more than the spec allows for. The resistor is not in circuit.
It takes about 2 minutes to reach some form of stable value.
gamalot:
What kind of resistance are you measuring? What kind of test leads are you using? How long did you wait for the reading to stabilize?
The test voltage in the 1 kiloohm range of the 34465A is 1 volt. You may need a little time to warm up the resistance under test.
bob91343:
With that kind of resolution you can't ignore thermal emf.
pwnell:
It is a 1k 1% carbon resistor. The meter says it uses 1mA on the 1k ohm range. It feels very cool to the touch. Thermocouple says resistor is 1C below room temp after 5 minutes, yet value still fluctuates.
gamalot:
I don't have any carbon film resistors in my hand, so I can't repeat your experiment. However, I think your multimeter is worth testing it with a better resistance.
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