TM 5-6675-323-14
( 1 5 ) F o r m a n u a l c a l i b r a t i o n o f CA :
key to perform the following equation.
Press
=
AT
C
A
RT
= Horizontal scale of shape to be measured.
S HOR
= Vertical scale of shape to be measured.
S
VERT
= Area of test rule.
RT
= Average of pulse count reading.
R
T
S
S
HOR and
VERT are usually provided with map.
A
T is premark value on top of test rule.
R
T can be found on Calibration Records Sheet or from average measurements made
with test rule
(16) Note value of actual area measured by test rule, which is premarked on
top of test rule.
( 1 7 ) Use test rule area and the scale ratio of shape to be measured to
d e t e r m i n e C A ( c a l i b r a t i o n c o n s t a n t ) . C A 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 a s a l i n e m e n t o f t h e p l a n i m e t e r w i t h t h e l e n s t r a c i n g a s s e m b l y ( p a r a -
graph 9-6.21).
( 2 ) T h e t e s t measurement checks the alinement of the planimeter with the
i n i t i a l u s e o f the needle tracing assembly.
( 3 ) T h e needle on the needle tracing assembly fits into the hole on the long
t e s t rule to make test measurements.
(4) The average RT reading obtained by following the steps for the lens
t r a c i n g assembly should be within 0.2% of the R T v a l u e g i v e n o n C a l i b r a t i o n R e c o r d s
Worksheet provided with equipment.
C
A.
(5) The same formula is used to determine the calibration constant,
P r o v i d e s information needed to make
n. Alinement of linear measuring probe.
Using the testing procedure provides values needed to check
linear measurements.
a l i n e m e n t with factory determined values and provides a constant to use in
determining additional measurements and calculations.
(1) Assemble QPS with the linear measuring probe.
9-52
