Normal Open Circuit Dc Weld Voltage Waveform - Lincoln Electric SHIELD-ARC SVM128-A Service Manual

F-29

NORMAL OPEN CIRCUIT DC WELD VOLTAGE WAVEFORM

HIGH IDLE – NO LOAD – FINE CURRENT CONTROL RHEOSTAT AND SELECTOR
TROUBLESHOOTING & REPAIR
SWITCH AT MAXIMUM
50 volts
This is the typical DC output voltage
generated from a properly operating
machine. Note that each vertical divi-
sion represents 50 volts and that
each horizontal division represents 5
milliseconds in time.
Note: Scope probes connected at
machine output terminals.
SCOPE SETTINGS
Volts/Div.....................50V/Div.
Horizontal Sweep .....5 ms/Div.
Coupling.............................DC
Trigger.........................Internal
SA-250
CH1
0 volts
5 ms
F-29