Lincoln Electric 122-A User Manual download pdf (Page 77)

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TROUBLESHOOTING & REPAIR

F-33 F-33

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

50 volts and that each horizontal divi-

sion represents 2 milliseconds in

time.

Note: Scope probes connected at

machine output terminals: (+) probe

to positive terminal, (-) probe to neg-

ative terminal.

SCOPE SETTINGS

Volts/Div.....................50V/Div.

Horizontal Sweep.....2 ms/Div.

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

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

NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM

CONSTANT CURRENT MODE – NO LOAD

CH1

0 volts

2 ms

50 volts

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 115 116

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Lincoln Electric 122-A User Manual Page 77