TM5-6675-326-14
6-6.2.14 Alinement of Planimeter With Lens Tracing Assembly - Continued
c. Remove Y-shaped test rule from carrying case.
d.
Tape piece of paper to table.
Draw a horizontal line 12
inches long.
e.
place planimeter on paper so it straddles line drawn.
f .
Hold tracer arm in place and turn wheels on planimeter so
that wheel axle forms 90° angle with tracer arm.
g .
Press point of Y-shaped test rule into paper on horizontal
l i n e .
h .
Place lens tracing assembly so that recessed end of Y-shaped
test rule rests against edge of lens.
Press edge of lens so
that it rides against inside edges of test rule recess.
i .
Clear auto-scaler by pressing and releasing foot switch.
NOTE
If planimeter is allowed to slip, area measured
w i l l n o t b e a c t u a l a r e a o f t e s t r u le , and results
w i l l b e i n a c c u r a t e .
j .
Keep lens pressed firmly against test rule.
Slowly trace
360° circle by moving lens in a clockwise direction around
c e n t e r o f t e s t r u l e . S t o p w h e n y o u r e t u r n t o s t a r t i n g
p o i n t .
Record pulse count value.
Clear auto - scaler by
pressing and releasing foot switch.
k .
Repeat steps h through j, four times.
R e p o s i t i o n t e s t r u le
at different point on line after three measurements.
Average the pulse counts shown on LED display after each
test measurement to obtain R T v a l u e.
NOTE
o
If average RT value is not within ±0.2% of
factory determined RT value, the planimeter
may be defective.
Repeat alinement procedure.
Notify direct support and general support
maintenance for service or replacement.
o
If using preprogrammed cards, manual calculation
o f C A ( c a l i b r a t i o n c o n s t a n t ) i s n o t n e c e s s a r y .
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