TM5-6675-326-14
6-6.2.21 Measuring Areas Without the Calculator - Continued
(11) Set auto-scaler X MEMORY switch to 1.
(12) Set calculator OFF/ON switch to OFF .
c.
Tape map or drawing to be measured to table.
d.
Select correct tracer arm length .
e.
If needed, aline planimeter for tracer arm length selected
(para 6-6.2.14).
Record RT value.
NOTE
F a c t o r y d e t e r m i n e d RT value is given on Calibration
Records Sheet provided with equipment.
Alinement
is performed as a check.
f .
Manually calculate alinement constant, CA, using the
f o l l o w i n g e q u a t i o n:
C A =
S c2 =
u =
g .
E n t er
C A = S c2 x u
Alinement constant
Scale ratio squared (given on map being measured or
determined by equation in para 6-6.2.19)
Value of one planimeter unit (factory determined value
provided on Calibration Records Sheet provided with
equipment)
t h r e e m o s t s i g n i f i c a n t d i g i t s o f a l i n e m e n t c o n s t a n t ,
C A , i n t o a u t o - s c a l e r u s i n g s c a l e r d i a l s.
( 1 ) S e t f i r s t m o s t s i g n i f i c a n t d i g i t o n l e f t - h a n d d i a l .
( 2 ) S e t s e c o n d m o s t s i g n i f i c a n t d i g i t o n m i d d l e d i a l .
( 3 ) S e t t h i r d m o s t s i g n i f i c a n t d i g i t o n r i g h t - h a n d d i a l.
(4) Example:
If C A i s 1 0 . 5 7 1,
left-hand dial should read
1, middle dial should read 0, and right-hand dial
should read 5.
h .
S e t d e c i m a l s e l e c t o r a c c o r d i n g t o v a l u e o f f i r s t s i g n i f i c a n t
d i g i t o f a l i n e m e n t c o n s t a n t.
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