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This is NOT the typical DC (+) output
voltage waveform. One output SCR is
not functioning. Note the “gap”in the
waveform. One SCR gate was discon-
nected to simulate an open or non-
functioning output SCR. 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 terminals: (+) probe to
electrode, (–) probe to work.
SCOPE SETTINGS
Volts/Div.....................50V/Div.
Horizontal Sweep .....2 ms/Div.
Coupling.............................DC
Trigger.........................Internal
ABNORMAL OPEN CIRCUIT VOLTAGE - DC TIG MODE
ONE OUTPUT SCR NOT FUNCTIONING
TROUBLESHOOTING AND REPAIR
F-37 F-37
PRECISION TIG® 225
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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.
____________________________________________________________________
0 volts
2ms
50
volts