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F-31

TROUBLESHOOTING AND REPAIR

F-31

NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM

0 VOLTS

20.0 V

2.5 ms

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This is a typical DC output voltage waveform generated from a properly operating machine. Note that each vertical division represents 20 volts and that each horizontal division represents 2.5 milliseconds in time.

NOTE: Scope probes connected at

machine output terminals: (+) probe to elec- trode, (-) probe to work.

SCOPE SETTINGS

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

Horizontal Sweep . . . . . . . . . 2.5 ms/Div

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

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

POWER MIG 255C

Page 71
Image 71
Lincoln Electric SVM170-A service manual Normal Open Circuit Voltage Waveform, Volts