This is the typical DC open circuit voltage wave-
form. The machine was in an open circuit con-
dition (no load) and operating properly. Note
that each vertical division represents 2 volts and
that each horizontal division represents 5 milli-
seconds in time.

Note: Scope probes connected at SCR gate
and cathode: (+) probe to gate, (-) probe to
cathode.

SCOPE SETTINGS

Volts/Div.......................2V/Div.
Horizontal Sweep.....5 ms/Div.
Coupling ............................DC
Trigger .........................Internal

TYPICAL SCR GATE VOLTAGE WAVEFORM

CONSTANT VOLTAGE MIG

MAXIMUM OUTPUT SETTING – NO LOAD

0 volts

5 ms

2 volts

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