SM0486
c. Atmospheric pressure values created in the test
chamber
are
converted to altitude readings on the altimeter scales.
d. After the barometer is adjusted to read the vacuum pressure in the
test chamber, the altitude readings on the altimeters should agree
with the barometer scale readings.
Figure 14.
Calibration of altimeters
Does the list of conclusions agree with yours?
Did you draw additional
conclusions?
There were more, but we hope that the ones listed were obvious to
you.
Let's examine a typical altimeter calibration procedure to see if the
preceding list is sufficient.
(2) Connect the barometer to the system as shown in Figure 14. Check your
adjustment of the temperature and gravity indices for proper positions and adjust
the vernier slide to the desired pressure and altitude.
Using the vernier clamp
locknut (Figure 15) make the final adjustment with the vernier adjusting nut.
Align the altitude index on the vernier slide with the desired altitude mark on the
scale within one of the following internals;
-1000 to 10,000 feet, marked each 100 feet.
10,000 to 50,000 feet, marked each 500 feet.
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