Lincoln Electric SVM100-A service manual Normal Open Circuit Voltage Waveform DC TIG Mode

Models: SVM100-A

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F-33

TROUBLESHOOTING & REPAIR

 

NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM

DC TIG MODE

CAUTION

HIGH VOLTAGE / HIGH FREQUENCY can damage test equipment.

Perform all voltage and waveform checks with high frequency circuit OFF.

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CH1

0 volts

50 volts

2ms

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This is the typical DC (+) output voltage waveform generated from a properly operat- ing machine. Note that each vertical divi- sion represents 50 volts and that each hori- zontal division represents 2 milliseconds in time.

Note: Scope probes connected at machine

output studs: (+) probe to electrode, (–) probe to work.

SCOPE SETTINGS

Volts/Div

50 V/Div.

Horizontal Sweep

2 ms/Div.

Coupling

DC

Trigger

Internal

 

 

SQUARE WAVE TIG 255

Page 74
Image 74
Lincoln Electric SVM100-A service manual Normal Open Circuit Voltage Waveform DC TIG Mode