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
You have a decent shunt. Look at the bridge and see silver-solder to the blocks.
I use Caig De-Oxit D-100 to eliminate resistance between the block and the millivolt wire terminals which BTW ahould be soldered not just pinched on.
Millivolt wire leads to the monitor should NOT be paralleled with other wires.
Millivolt lead wires to the monitor should be twisted around each other 2x - inch to null stray inductance.
I am so fussy about millivolt wire integrity I silver soldered them to the shunt blocks on my big bank. Aircraft 20/2 shielded wire and yes, the wires are twisted inside the braided tinned sheathing and teflon cover. I used a Bernz-o-Matic pencil tip torch to solder the wire to the block. Five aluminum hemostats to keep the bridges cooler.
But do try the De-Oxit D-100 it keeps everything honest in my measuring stuff.
I use Caig De-Oxit D-100 to eliminate resistance between the block and the millivolt wire terminals which BTW ahould be soldered not just pinched on.
Millivolt wire leads to the monitor should NOT be paralleled with other wires.
Millivolt lead wires to the monitor should be twisted around each other 2x - inch to null stray inductance.
I am so fussy about millivolt wire integrity I silver soldered them to the shunt blocks on my big bank. Aircraft 20/2 shielded wire and yes, the wires are twisted inside the braided tinned sheathing and teflon cover. I used a Bernz-o-Matic pencil tip torch to solder the wire to the block. Five aluminum hemostats to keep the bridges cooler.
But do try the De-Oxit D-100 it keeps everything honest in my measuring stuff.
