Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => AmpTools/Tech Tips => Topic started by: stratomaster on October 14, 2025, 09:39:23 am

Title: DMM resistance readings falling
Post by: stratomaster on October 14, 2025, 09:39:23 am

In the last few weeks my meter, Fluke 117, has had issues providing stable resistance readings.  This is especially evident on higher values, but not approaching internal resistance, in the 220k-2.2M range. I know high value resistors can read low, but this isn't that. The readings are "in the ballpark" but always fall and don't stabilize in a reasonable amount of time.

This is new behavior and a replacement battery has not improved anything.  Is this a sign of an internal fault, or some other issue?

Meter is at least 15 years old and has not been in for calibration or service in that time.

Title: Re: DMM resistance readings falling
Post by: Carlsoti on October 14, 2025, 10:06:08 pm

At the risk of asking the obvious, have you tried a new set of leads?

Title: Re: DMM resistance readings falling
Post by: stratomaster on October 14, 2025, 10:17:31 pm

Yes. It isn't related to the leads.

Title: Re: DMM resistance readings falling
Post by: acheld on October 15, 2025, 12:15:01 pm

Yeah, that's not right.   I would call Fluke directly and ask their advice.   

https://www.fluke.com/en-us/support/technical-support (https://www.fluke.com/en-us/support/technical-support)

I have the same meter, and it has been rock solid for ten years or so . . .