Lincoln Electric 122-A User Manual download pdf (Page 80)

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TROUBLESHOOTING & REPAIR

F-36 F-36

LINCOLN

ELECTRIC

IDEALARC DC-400

This is the typical DC open circuit

voltage waveform generated from a

properly operating machine. Note

that each vertical division represents

20 volts and that each horizontal divi-

sion represents 5 milliseconds in

time. The machine was loaded with

a resistance grid bank. The DC-400

meters read 400 amps at 36 VDC.

Note: Scope probes connected at

machine output terminals: (+) probe

to positive terminal, (-) probe to neg-

ative terminal.

SCOPE SETTINGS

Volts/Div.....................20V/Div.

Horizontal Sweep.....5 ms/Div.

Coupling ............................DC

Trigger.........................Internal

TYPICAL OUTPUT VOLTAGE WAVEFORM – MACHINE LOADED

CONSTANT VOLTAGE FCAW/GMAW MODE

CH1

0 volts

5 ms

20 volts

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 115 116

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Lincoln Electric 122-A User Manual Page 80