Typical Scr Gate Voltage Waveform - Lincoln Electric Idealarc DC600 9773MSP Service Manual

TROUBLESHOOTING & REPAIR

TYPICAL SCR GATE VOLTAGE WAVEFORM

CONSTANT VOLTAGE INNERSHIELD
MAXIMUM OUTPUT SETTING - NO LOAD
This is the typical SCR gate pulse voltage
waveform. The machine was in an open cir-
cuit condition (no load) and operating proper-
ly. Note that each vertical division represents
2 volts and that each horizontal division rep-
resents 5 milliseconds in time.
Note: Scope probes connected at SCR gate
and cathode: (+) probe
(-) probe to cathode.
2 volts
Volts/Div . . . . . . . . . . . . . . .2 V/Div.
Horizontal Sweep . . . . . . .5 ms/Div.
Coupling . . . . . . . . . . . . . . . . . . .DC
Trigger . . . . . . . . . . . . . . . . .Internal
to gate,
CH1
0 volts
5ms
SCOPE SETTINGS
IDEALARC DC-600
F-45