3500/42 Operation and Maintenance
Maintenance
145
Note
Use the Transducer Scale Factor displayed in the Scale Factor Box on the
Verification Screen.
Full Scale =
(Zero Position Voltage) - (Transducer Scale Factor
×
Top Meter Scale)
Bottom Scale =
(Zero Position Voltage) + (Transducer Scale Factor
×
ABS (Bottom Meter
Scale))
Example 1:
Transducer scale factor = 200 mV/mil
Meter scale range = 20-0-20 mil
Zero Position Voltage = -9.75 Vdc
Full-Scale Value
= (-9.75) - (0.200
×
20)
= -13.75 Vdc
Bottom-Scale Value
= (-9.75) + (0.200
×
20)
= -5.75 Vdc
Example 2:
Transducer scale factor
= 7,874 mV/mm
= 7.874 mV/
µ
m
Meter scale range = 200-0-200
µ
m
Zero Position Voltage = -9.75 Vdc
Full-Scale Value
= (-9.75) - (0.007874
×
200)
= -11.3248 Vdc
Bottom-Scale Value
= (-9.75) + (0.007874
×
200)
= -8.1752 Vdc
4. Adjust the power supply voltage to match the voltage displayed in the Z.P.
Volts Box. The Direct bar graph display and the Current Value Box should
read 0 mil (0 mm) ±1 %.
5. Adjust the power supply voltage for full scale. Verify that the Max value in the
Current Value Box (the value on the left of the divider bar) is reading ±1 % of
full scale. If the recorder output is configured, refer to Section 5.1.10 (Verify
Recorder Outputs) for steps to verify the recorder output.
6. Adjust the power supply voltage for bottom scale. Verify that the Min value in
the Current Value Box (the value on the right of the divider bar) is reading
±1% of bottom scale. If the recorder output is configured, refer to Section
5.1.10 (Verify Recorder Outputs) for steps to verify the recorder output.
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