ESAB ESP-600C - Procedure for Verifying Calibration of Digital Meters

SECTION 6 Troubleshooting
ESP 400C and 600C Plasma Power Sources
6-19
• It is important to have the barrels of the black
and clear insulated wires, from the three lead
cable, be pointing in opposite directions.
• The third wire attaches to the bus bar on the left
with the shunt mounting hardware. Orientation
of this wire is not critical.
6.4.4 Procedure For Verifying Calibration Of Digital Meters.
Voltmeter
1. Connect a digital meter known to be calibrated
to the positive and negative output bus bars.
2. Compare the power source voltmeter reading to
the calibrated meter reading. Readings should
match within ± 0.75%
Ammeter
1. External to the power source, connect a
precision shunt in series with the work lead(s).
The best shunt is one with a value of 100 µΩ
(50mV/500A or 100mV/1000A) and a calibrated
tolerance of ± 0.25%.
2. Use a calibrated 4 ½ digit meter to measure the
output of the shunt. The amperage indicated
with the external shunt and meter should match
power source ammeter to within ± 0.75%.
Two Leads
Three Leads
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