MIL-DTL-48556B
3.7 Cleanliness. There shall be no evidence of moisture, grease, fingerprints,
condensates, dirt, debris, scratches, fractures or adhesive separations on glass windows or
counters.
3.8 Performance.
3.8.1 Elevation counter excursion range. The elevation counter shall cover the
excursion of at least 1433 mils in elevation and 280 mils in depression (9720 as read on the
elevation counter) with the correction counter indicating "00 mils."
3.8.2 Correction counter excursion range. The correction counter limit stops shall
have a minimum of 95 mils excursion, but not over 99 mils excursion on the "+" and "-"
dials.
3.8.3 Elevation accuracy. The error at any elevation setting shall not exceed ± 0.5
mil. Nine readings shall be taken in 200 mil increments. The total combined error of all
readings shall not exceed 1.0 mil.
3.8.4 Backlash. The backlash in the elevating mechanism shall not exceed ± 0.7
mils at any elevation setting between 280 mils in depression (9720 as read on the elevation
counter) and 1433 mils in elevation.
3.8.5 Cross level vial bubble. The cross level vial bubble shall remain centered
within the thickness of a graduation line when the quadrant is elevated from 280 mils
depression (9720 as read on the elevation counter) to 1433 mils elevation and the elevation
level vial bubble is centered.
3.8.6 Correction counter setting effect on elevation counter. Setting a positive
reading into the correction counter shall decrease the elevation counter reading by the same
amount within ± 0.5 mils. Setting a negative reading into the correction counter shall
increase the elevation counter reading by the same amount within ± 0.5 mils.
3.8.7 Correction counter setting effect on elevation level bubble. Any change in
position of the elevation level vial bubble shall not be greater that the thickness of a
graduation line when any value within the excursion range of the correction counter is set.
3.9 Knob torque. The torque for the elevation and correction knobs shall be within
the ranges shown in Table II at the specified temperatures.
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