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In Reply to: RE: Current reading different accross choke and resistor??? posted by TomWh on December 26, 2021 at 14:22:02
You might want to insert a current meter.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
Hey Tre
I have a few meters I can use but I am confuse why the different readings. The ten ohm resistor is a actual test point I can get to with everything sealed up.
Will see if meters show same reading in both spots at the choke and resistor. If they are I might be losing current somehow.
Thanks Tom
Measuring voltage across a resistance and then calculating relies on the accuracy of the resistance reading. If you insert your multimeter (in the current mode) into the circuit at each spot and that reads different, then they are different for sure.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Voltage across a power supply choke likely includes AC as well as DC components.
"Voltage across a power supply choke likely includes AC as well as DC components. "
And the AC component is likely not sinusoidal. This is not a good place to measure current. It would be better to insert a current meter like Tre suggested, probably after the last filter cap.
--------------------------
Buy Chinese. Bury freedom.
The choke resistance will increase when hot - so it will read higher as it warms up. In fact this characteristic is used to measure internal temperature in transformers and choke / motor windings.
Edits: 12/27/21
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