Lincoln Electric RED-D-ARC DX450 Service Manual page 129

F-85
NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM (WIRE CV TAP)
TROUBLESHOOTING AND REPAIR
MAX CONTROL POT - HIGH IDLE - NO LOAD
50V
This is the typical DC open circuit out-
put voltage generated from a properly
operating machine. Note that each
vertical division represents 50 volts
and that each horizontal division rep-
resents 5 milliseconds in time.
NOTE: Scope probes are connected
at weld output terminals.
SCOPE SETTINGS
Volts/Div.....................50V/Div.
Horizontal Sweep .....5 ms/Div.
Coupling.............................DC
Trigger.........................Internal
5ms
DX450
F-85
0 volts