Lincoln Electric SVM188-A Service Manual page 72

F-32
NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM
CONSTANT CURRENT MODE – NO LOAD
TROUBLESHOOTING AND REPAIR
50V
This is the typical DC open circuit
voltage waveform generated from a
properly operating machine. Note
that each vertical division represents
50 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 nega-
tive high inductance terminal.
SCOPE SETTINGS
Volts/Div .....................50V/Div.
Horizontal Sweep .....2 ms/Div.
Coupling.............................DC
Trigger .........................Internal
DC-600
0 volts
2ms
F-32