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F-29
NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM
HIGH VOLTAGE / HIGH FREQUENCY can damage test equipment.
• Perform all voltage and waveform checks with high frequency circuit OFF.
• Perform High Frequency Disable Procedure.
____________________________________________________________________
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 terminals: (+) probe to electrode, (–)
probe to work.
TROUBLESHOOTING & REPAIR
AC TIG MODE
CAUTION
50 V
PRECISION TIG 185
2 ms
SCOPE SETTINGS
Volts/Div. ...............................50 V/Div.
Horizontal Sweep .................2 ms/Div.
Coupling .........................................DC
Trigger .....................................Internal
F-29
0 V
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