Lincoln Electric MULTI-SOURCE SVM155-A - Manual (Page 71)

F-43 F-43
TROUBLESHOOTING & REPAIR
MULTI-SOURCE
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TYPICAL SCR GATE VOLTAGE WAVEFORM - NO LOAD
0 volts
2 ms 1 volt
This is the typical SCR gate pulse volt-
age waveform. The machine was in an
open circuit condition (no load) and
operating properly. Note that each verti-
cal division represents 1 volt and that
each horizontal division represents 2 mil-
liseconds in time.
Note: Scope probes connected at SCR
gate and cathode: (+) probe to gate, (-)
probe to cathode.
Volts/Div........................1 V/Div.
Horizontal Sweep...... 2 ms/Div.
Coupling..............................DC
Trigger..........................Internal
Scope Settings