Lincoln Electric SVM100-A AC TIG Mode Auto Balance on, Machine Loaded to 50 Amps AT 26VAC

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TROUBLESHOOTING & REPAIR F-36

AC TIG MODE (AUTO - BALANCE ON)

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 CH1

0 volts 0 volts

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20 volts 2ms

MACHINE LOADED TO 50 AMPS AT 26VAC

These are typical AC output voltage wave- forms generated from a properly operating machine. Note each vertical division repre- sents 20 volts and each horizontal division represents 2 milliseconds in time. The machine was loaded with a resistance grid bank. As the load is increased the output waveform becomes more “square”.

Note: Scope probes connected at machine

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

20 volts 2ms

MACHINE LOADED TO 200 AMPS AT 46 VAC

SCOPE SETTINGS

Volts/Div	20 V/Div.
Horizontal Sweep	2 ms/Div.
Coupling	DC
Trigger	Internal

SQUARE WAVE TIG 255