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TROUBLESHOOTING & REPAIR
F-39 F-39
SQUARE WAVE TIG 275
MACHINE LOADED TO 275 AMPS
AT 31 VDC.
This is the typical AC output voltage
waveform generated from a properly
operating machine. Note that each
vertical division represents 20 volts
and that each horizontal division rep-
resents 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
AC STICK MODE