MIL-DTL-27190C
3.4.1 Tolerances. The indicator shall operate within the tolerances specified in tables II and III.
TABLE II. Scale error tolerances.
Tolerance
PSI
ąpsi
0
50
500
50
1,000
50
1,500
50
2,000
50
2,500
50
3,000
50
3,500
50
4,000
50
TABLE III. Test tolerances.
Tolerance
Test
ąpsi
Position error at 2,500 psi
25
Friction:
Room temperature
50
High temperature
50
Low temperature
75
Vibration:
Pointer oscillation
50
Pointer variation
50
3.4.2 Dielectric strength. The indicator shall withstand 200V root square mean (rms) at
a commercial frequency for a period of 5 seconds.
3.4.3 Case leakage. Case leakage shall not exceed 0.1 micron cubic foot per hour.
3.4.4 Fogging. There shall be no evidence of moisture or oil fogging of the cover glass
when the indicator is subjected to a temperature of 85 °C ą 5 °C for a minimum period of 2 hours
and then the face of the cover glass is immediately immersed in an ice bath for 3 minutes.
3.4.5 Step input response. The time required for the indicator to properly respond to a
step input equivalent to a 2,000-psi pressure change shall not exceed 2.0 seconds with not more
than two overshoots.
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