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TROUBLESHOOTING & REPAIR
F-38 F-38
SQUARE WAVE TIG 275
MACHINE LOADED TO 275 AMPS
AT 31 VDC.
This is the typical DC (+) output volt-
age waveform generated from a prop-
erly operating machine. Note that
each vertical division represents 20
volts and that each horizontal division
represents 2 milliseconds in time. The
machine was loaded with a resistance
grid bank.
NOTE: Scope probes connected at
machine output terminals: (+) probe to
electrode, (–) probe to work.
SCOPE SETTINGS
Volts/Div....................20 V/Div.
Horizontal Sweep.....2 ms/Div.
Coupling.............................DC
Trigger.........................Internal
0 V
2 ms
20 V
CAUTION
HIGH VOLTAGE / HIGH FREQUENCY can damage test equipment.
• Perform all voltage and waveform checks with high frequency circuit OFF.
• Perform High Frequency Disable Procedure.
TYPICAL OUTPUT VOLTAGE WAVEFORM - MACHINE LOADED
DC TIG MODE