TM 5-6675-325-14
(15) For manual calibration of CA:
(16) Note value of actual area measured by test rule, which is premarked on
top of test rule.
(17) Use test rule area and the scale ratio of shape to be measured to
determine CA (calibration constant).
CA is needed to perform various measurements.
m . Alinement of planimeter with needle tracing assembly.
(1) Alinement of the planimeter with the needle tracing assembly follows the
same procedure as alinement of the planimeter with the lens tracing assembly (para-
graph 5-6.21).
(2) The test measurement checks the alinement of the planimeter with the
initial use of the needle tracing assembly.
(3) The needle on the needle tracing assembly fits into the hole on the long
test rule to make test measurements.
(4) The average RT reading obtained by following the steps for the lens
tracing assembly should be within ±0.2% of the RT value given on Calibration Records
Worksheet provided with equipment.
(5) The same formula is used to determine the calibration constant, CA.
Alinement of linear measuring probe.
Provides information needed to make
linear measurements. Using the testing procedure provides values needed to check
alinement with factory determined values and provides a constant to use in
determining additional measurements and calculations.
n.
(1) Assemble QPS with the linear measuring probe.
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