Typical Output Voltage Waveform - Machine Loaded (Dc Tig Mode - Lincoln Electric SQUARE WAVE SVM118-A Service Manual

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TYPICAL OUTPUT VOLTAGE WAVEFORM – MACHINE LOADED
HIGH VOLTAGE / HIGH FREQUENCY can damage test equipment.
• Perform all voltage and waveform checks with high frequency circuit OFF.
TROUBLESHOOTING & REPAIR
DC TIG MODE
CAUTION
20 volts
MACHINE LOADED TO 350 AMPS
AT 34VDC
This is a typical DC (+) 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 resis-
tance grid bank. The TIG 355 display
read 350 amps at 34 VDC.
Note: Scope probes connected at
machine output terminals: (+) probe
to electrode terminal, (-) probe to
work terminal.
SCOPE SETTINGS
Volts/Div.....................20V/Div.
Horizontal Sweep.....2 ms/Div.
Coupling ............................DC
Trigger .........................Internal
SQUARE WAVE TIG 355
CH1
0 volts
2 ms
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