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PRECISION TIG 185
TROUBLESHOOTING & REPAIR
F-33 F-33
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TYPICAL OUTPUT VOLTAGE WAVEFORM - MACHINE LOADED
AC TIG MODE
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.
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10 V
2 ms
0 V
MACHINE LOADED TO 180 AMPS AT
16VDC.
This is the typical AC output voltage wave-
form generated from a properly operating
machine. Note that each vertical division
represents 10 volts and that each horizontal
division represents 2 milliseconds in time.
The machine was loaded with a resistance
grid bank. The grid load meters read 180
amps and 16VDC
Note: Scope probes connected at machine
output terminals: (+) probe to electrode, (–)
probe to work.
Volts/Div. ...............................10 V/Div.
Horizontal Sweep .................2 ms/Div.
Coupling.........................................DC
Trigger .....................................Internal
SCOPE SETTINGS