MIL-PRF-25439C
4.5.6 Position error. In determining the position error, two additional calibration tests
shall be conducted. The first test position shall be the normal test position. The second test
position shall be horizontal with the connectors at the 6 o'clock position when looking at the
inlet end of the transmitter. The third test position shall be horizontal with connectors at the 9
o'clock position when looking at the transmitter from the inlet end. The calibration errors in
positions 2 and 3 shall not exceed the room temperature tolerance in position 1 by more than that
specified in Table II.
TABLE I. Scale error tolerance.
Scale Error Tolerance ± PPM
Flow
Room
Low
High
Substitute
Cycling
PPM
Temp
Temp
Temp
Fuel
Test
0
20
30
30
30
40
1,000
20
30
30
30
40
2,000
25
35
35
35
45
3,000
40
55
55
55
65
4,000
60
80
80
80
90
6,000
70
100
100
100
110
8,000
120
180
180
180
190
10,000
220
290
290
290
300
TABLE II. Transmitter accuracy.
Test
Tolerance
Friction:
Room Temperature
5 ppm
Low Temperature
5 ppm
High Temperature
5 ppm
Position Error
20 ppm
Voltage and Frequency Effect:
Scale Error
20 ppm
Phase Angle
3°
Vibration:
Variation
40 ppm
Oscillation
60 ppm (double amp)
11
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