Lincoln Electric IDEALARC DC-655 - Manual (Page 87)

TROUBLESHOOTING & REPAIR
F-45 F-45
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This is the typical DC open circuit
voltage waveform generated from a
properly operating machine. Note
that each vertical division represents
20 volts and that each horizontal divi-
sion represents 2 milliseconds in
time.
Note: Scope probes connected at
machine output terminals: (+) probe
to positive terminal, (-) probe to neg-
ative high inductance terminal.
SCOPE SETTINGS
Volts/Div.....................20V/Div.
Horizontal Sweep.....2 ms/Div.
Coupling ............................DC
Trigger .........................Internal
NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM
CONSTANT VOLTAGE MIG
MINIMUM OUTPUT SETTING – NO LOAD
0 volts
2 ms 20 volts