The manufacturer of the CO2 Laser tube instructs to put an amp meter on the low side of the laser tube for calibration. While I understand the amp meter will only see a few milli volts above ground; the tube will be at 19kV @ 26mA.
Will any amp meter work for this?Is it safe to leave the current meter in the system after calibration for monitoring?
Should I put a zener diode or some sort of protect around my amp meter? If I used a hall effect current sensor and attached the output to a controller board would I need optical isolation?