Specifications

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

r In