Maintenance
3500/42 Operation and Maintenance
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2. Connect test equipment and run software as described in Section 5.1.6.1
(Test Equipment and Software Setup - Thrust Position and Differential
Expansion).
3. Calculate the full-scale and bottom scale values. These values can be
calculated in the following way:
Full-scale Value, Bottom Scale Value =
Zero Position Voltage ± (Transducer Scale Factor
×
Scale Range)
Note
The Zero Position Voltage is the voltage input that will cause the reading on
the bar graph display and the Current Value Box to be zero. The Zero Position
Volts value is displayed in the Z.P. Volts box above each channel value bar
graph.
Note
If the bottom scale range is zero (for example 0 to 80 mil), use the Full-scale
Value formula.
Note
Use the Transducer Scale Factor displayed in the Scale Factor Box on the
Verification Screen.
If Upscale direction (Normal for Thrust, Long for Differential Expansion) is toward
the probe:
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 = 25-0-25 mil
Zero Position Voltage = -9.75 Vdc
Full Scale Value
= (-9.75) + (0.200
×
25)
= -4.75 Vdc
Bottom Scale Value
= (-9.75) - (0.200
×
25)
= -14.75 Vdc
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