Hi everyone,

My multimeter started to act weird when measuring DC voltage. All readings are way higher than expected. I tested a few sources that I'm reasonably sure about and the results are way off:
- AA battery 1.5V - reading is 21V
- power supply 12V - reading is 170V
- power supply 20V - reading is 275V
It seems that the error is almost linear, like actual reading is multiplied by a constant value (~14).

Is there anything that could be done here? Any suggestions are very appreciated!

/aleks
P.S. I replaced the batteries with a fresh set.

 

Welcome to AAC!

Are you taking all of these measurements on the same range?

What is the DMM model?

 

Welcome to AAC!

Are you taking all of these measurements on the same range?

What is the DMM model?

Hi Denis,
It's auto-ranging, or, at least, it was before this issue. If I manually select a range with a button, the reading doesn't change.
Model is Mastercraft 052-0052-2.

Appreciate your help!
/aleks

 

Have you tried changing the battery in your meter?

 

Have you tried changing the battery in your meter?

He did. See the P.S. on post #1

 

Bad meter?
Time for a new meter.

 

There might be a voltage divider in it with one half failed. Pop the case open, see if anything is obviously deceased.