Section VII
g. Invert magnetic azimuth reference detector on
degrees. Record error at each heading. Calculate
algebraic average index error (I2) as in Steps 7-7.e,
Turntable so that telescope is below the unit. To
and record this value.
accomplish this inversion, remove the three mag-
natic azimuth reference detector mounting screws,
place magnetic azimuth reference detector upside
Note
down so that telescope is below Turntable top mounting
plate, and replace the mounting screws into the
plate.
With the inversion fixture inverted, readout
error at a 90-degree Turntable heading will
be read at about 270 DEGREES on the read-
out ; at a 270-degree Turntable heading,
h. Sight the same target recorded in paragraph
readout error will be read at about 90
7-7.f. Set Turntable azimuth scale to target bearing.
Rotate Turntable to headings of 0, 90, 180, and 270
DEGREES on the readout.
7-9
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