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F-43TROUBLESHOOTING & REPAIRF-43

TYPICAL OUTPUT VOLTAGE WAVEFORM - MACHINE LOADED TO 200 AMPS

DC - TIG MODE

HIGH VOLTAGE/ HIGH FREQUENCY can damage test equipment.

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

Perform High Frequency Disable Procedure.

 

0V

20V

5 ms

This is the typical AC output voltage waveform generated from a properly operating machine. Note that each ver- tical division represents 20 volts and that each horizontal division represents 5 milliseconds in time.

NOTE: Scope probes connected at

machine output terminals: (+) probe to electrode, (-) probe to work.

NOTE: AC balance control set at “Balanced” position.

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SCOPE SETTINGS

Volts/Div

20V/Div.

Horizontal Sweep

5 ms/Div.

Coupling

DC

Trigger

Internal

PRECISION TIG 275

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Lincoln Electric SVM162-B service manual 43TROUBLESHOOTING & REPAIRF-43, DC TIG Mode