Maintenance
3500/42 Operation and Maintenance
112
If Gap is configured to read in displacement units, calculate the full-scale and
bottom-scale voltage using the following equation:
Note
Use the Transducer Scale Factor displayed in the Scale Factor Box on the
Verification Screen.
Gap Full-Scale =
Gap Zero Position Volts + (Gap Meter Top Scale
×
Transducer Scale Factor)
Example 1:
Transducer Scale Factor = 200 mV/mil
Scale Range is 15-0-15 mil (Gap Top Scale = 15 mil)
Gap Zero Position Volts = -9.75 Vdc
Gap Full Scale input = -9.75 Vdc + (15
×
0.200)
= -6.75 Vdc
Example 2:
Transducer Scale Factor = 7,874 mV/mm
= 7.874 mV/
µ
m
Scale Range is 300-0-300
µ
m (Gap Top Scale = 300
µ
m)
Gap Zero Position Volts = -9.75 Vdc
Gap Full Scale input = -9.75 Vdc + (300
×
0.007874)
= -7.3878 Vdc
Gap Bottom-Scale =
Gap Zero Position Volts - (Gap Meter Bottom Scale
×
Transducer Scale
Factor)
Example 1:
Transducer Scale Factor = 200 mV/mil
Scale Range is 15-0-15 mil (Gap Bottom Scale = 15 mil)
Gap Zero Position Volts = -9.75 Vdc
Gap Bottom Scale input
= -9.75 Vdc - (15
×
0.200)
= -12.75 Vdc
Example 2:
Transducer Scale Factor = 7,874 mV/mm
= 7.874 mV/
µ
m
Scale Range is 300-0-300
µ
m (Gap Bottom Scale = 300
µ
m)
Gap Zero Position Volts = -9.75 Vdc
Gap Bottom Scale input
= -9.75 Vdc - (300
×
0.007874)
= -12.1122 Vdc
5. Adjust the power supply voltage to match the voltage displayed in the Gap
Zero Position Volts Box. The Gap bar graph display and Current Value Box
should read 0 mil (0 mm) ±1 %.
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