macona wrote:Be careful. If your lead between the meter and the return of the power supply becomes unhooked you will have a couple tens of thousands of volts in the meter which will arc over and jump to your power supply. This could be very bad.
gene wrote: I assume I'll need to replace it with the mA meter? or is there some way to tell mA with the voltage reading
mattrsch wrote:gene wrote: I assume I'll need to replace it with the mA meter? or is there some way to tell mA with the voltage reading
If you know the resistance of the shunt you can easily find the voltage with Ohm's law: V=IR, so V/R=I. Is the resistance of your shunt written on it somewhere? It might just give a relationship like 100mA, 75mV. If not a digital multimeter typically won't give a super accurate value for a low resistance measurment, but it should get you close. Somehow I missed before that what you bought was a voltmeter.
It is also a good idea to double check with a multimeter that you have good grounding on your frame everywhere. If something like the situation macona mentioned happens good frame grounding would be the difference between a life threatening shock and a scary moment.
gene wrote: so my laser power supply is baking that laser tube at like 25-26 mA when using the test button
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