Can a Shunt Go Bad?
My Trimetric meter is reading -0.1 amp, even with nothing but the sense wires connected to the load side of the shunt. All loads have been removed in the pictures below. It was actually reading -0...
Forum Discussion
This is an attempt to null the millivolt zero BFL13 :)
No need to to solder a clothespin will work to hold black and white wires for a few seconds.
My "guess' is they didn't put a "zeroing" circuit inside the meter. And this may be the way they calibrate to zero. Like a DMM with zero ohms. Pure guesswork.
Since doing this is free and easy it's worth a try.
DANGER WILL ROBINSON
Just make sure a dropped millivolt pair of wires cannot gain potential of > 50 mv somehow shorting across voltage potentials. It would tale 2 shorts one pos the other neg to do this. This is why I recommended a wooden clothespin.
Take an image beforehand th eliminate the irritating and slightly embarrassing reversing of millivolt wire reconnection.
Hope this works for you!
No need to to solder a clothespin will work to hold black and white wires for a few seconds.
My "guess' is they didn't put a "zeroing" circuit inside the meter. And this may be the way they calibrate to zero. Like a DMM with zero ohms. Pure guesswork.
Since doing this is free and easy it's worth a try.
DANGER WILL ROBINSON
Just make sure a dropped millivolt pair of wires cannot gain potential of > 50 mv somehow shorting across voltage potentials. It would tale 2 shorts one pos the other neg to do this. This is why I recommended a wooden clothespin.
Take an image beforehand th eliminate the irritating and slightly embarrassing reversing of millivolt wire reconnection.
Hope this works for you!
