Troubleshooting & repair, Meter circuit accuracy test – Lincoln Electric NA-5S User Manual
Page 120
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F-67
TROUBLESHOOTING & REPAIR
F-67
8. Test Voltmeter PC Board Accuracy
• Use a test meter with at least 3-
1/2 digits and +/- 0.5% accuracy.
• Connect the + probe to lead #517
and the - probe to lead #510C.
Do not disconnect plug.
Note: The coating will have to be
removed from the test points to ensure
accurate meter readings.
• With the NA-5 voltmeter reading
SET values of STRIKE voltage,
adjust the strike voltage control
until the NA-5 voltmeter matches
the settings in the table below.
• If the test meter does not match
the readings, the voltmeter PC
board may be faulty.
METER CIRCUIT ACCURACY TEST
(Continued)
NA-5
NA-5 SET VOLTS READING
TEST VOLTMETER READING
15.0VDC
1.50VDC +/- .04
30.0VDC
3.00VDC +/- .04
60.0VDC
6.00VDC +/- .06
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