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TROUBLESHOOTING & REPAIR

F-32

NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM

AC STICK MODE

CAUTION

HIGH VOLTAGE / HIGH FREQUENCY can damage test equipment.

Perform all voltage and waveform checks with high frequency circuit OFF.

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CH1

0 volts

50 volts

2ms

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This is the typical AC output voltage wave- form generated from a properly operating machine. Note that each vertical division represents 50 volts and that each horizontal division represents 2 milliseconds in time.

Note: Scope probes connected at machine

output studs: (+) probe to electrode, (–) probe to work.

SCOPE SETTINGS

Volts/Div

50 V/Div.

Horizontal Sweep

2 ms/Div.

Coupling

DC

Trigger

Internal

 

 

SQUARE WAVE TIG 255

Page 73
Image 73
Lincoln Electric SVM100-A service manual Normal Open Circuit Voltage Waveform AC Stick Mode