Doc# 100576 • REV C (Sept 2017) Page 23 of 42
4.1.1.4 MEASURE THE VOLTAGE IN GAP INCREMENTS
Increase the micrometer 10 mil (0.25 mm) increments and ll in the measured SIG Voltage in
the table below.
mils mm SIG Voltage
10 0.25
20 0.50
30 0.75
40 1.00
50 1.25
60 1.50
70 1.75
80 2.00
90 2.25
To calculate the Average Scale Factor (ASF), subtract the voltage measured at 10 mils (0.25
mm) from the voltage at 90 mils (2.25 mm)and divide by the full scale range of 80 mils (2
mm)
Example:
Voltage at 90 mils (2.25 mm) is -17.1 V
Voltage at 10 mils (0.25 mm) is -0.98 V
ASF = (-0.98) - (-17.1)/80 = 201.5 mV/mil
Or
ASF = (-0.98) - (-17.1)/2 = 8.06 mV/mm
To calculate the Incremental Scale Factor (ISF) at each gap, subtract the SIG voltage mea-
sured 10 mils (0.25 mm) below each increment and divide by 10 mils (0.25 mm).
Example:
Voltage at 40 mils (1.0 mm) is -7.1 V
Voltage at 50 mils (1.25 mm) is -9.02 V
ISF = (-9.02) - (-7.1)/10 = -192 mV/mil
Or
ISF = (-9.02) - (-7.1)/0.25 = -7.68 mV/mm
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