Electronics > Beginners
LCR meter ESR measurement seems off - What am I doing wrong?
jdurango:
Just bought an Agilent U1733c and trying to measure ESR. I read TFM and used acquired knowledge to engage ESR mode @ 100k, but every measurement seems suspect (high). So I wondered what would happen if I just shorted the test leads. Sure enough, I'm getting an ESR of 0.05 on a dead short. This can't be right, correct? Am I doing something wrong? Do I need to calibrate or zero it out first? Pic included. Thanks fellas!
jdurango:
Even a brand new 33uF cap is reading around 1.7 for ESR @1k, 10k, and 100k.
jdurango:
Just performed the little onboard open/short calibration per TFM. Getting basically the same results.
dmills:
Looking at some jellybean 160V 33uF parts on Digikey, I am seeing tan D in the order of 0.15 to 0.25 or so (Specified at 120Hz), which I figure makes a ohm or so perfectly believable.
Why are you surprised?
Regards, Dan.
Wimberleytech:
Here is my reference. Your values seem ok.
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