Troubleshooting & repair, Typical scr gate voltage waveform – Lincoln Electric IDEALARC SVM136-A User Manual

Page 70

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TROUBLESHOOTING & REPAIR

F-30

F-30

IDEALARC CV-400

This is the typical SCR gate pulse
voltage waveform. The machine was
in an open circuit condition (no load)
and operating properly. Note that
each vertical division represents 2
volts and that each horizontal division
represents 5 milliseconds 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

MAXIMUM OUTPUT SETTING – NO LOAD

0 volts

5 ms

2 volts

CH1

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