TM5-6675-326-14
6-6.2.21 Measuring Areas Without the Calculator - Continued
NOTE
l
Decimal selector sets decimal place for
auto-scaler LED display.
l
If constant is one or greater, set decimal
s e l e c t o r t o 0.
l
If constant is less than one, set decimal
s e l e c t o r a c c o r d i n g t o p l a c e 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 .
i .
Place planimeter near shape to be measured so that length of
tracer arm lies along imaginary line through center of
shape.
Set wheels so that their axles form 90° angle with
tracer arm.
j .
Make practice trace to be sure tracer arm will cover area.
k .
Select starting point for measurement, and mark.
1.
Set dot of lens tracing assembly over starting point.
m. Press CLEAR button to clear auto-scaler.
n. Trace boundary line of shape using dot in lens tracing
assembly.
Stop when you return to starting point.
o .
Press foot switch to activate ACCU and freeze count.
p.
Multiply numbers shown in the auto-scaler LED display to
obtain area of shape in square feet.
NOTE
l
I f f i r s t s i g n i f i c a n t d i g i t o f CA i s i n o n e s
column (one place to left of decimal point),
multiply auto-scaler LED display by 10.
l
I f f i r s t s i g n i f i c a n t d i g i t i s i n t e ns
column, multiply auto-scaler LED display by
100.
l
I f f i r s t s i g n i f i c a n t d i g i t i s t h r e e o r m o r e
p l a c e s t o l e f t o f d e c i m a l p o i n t , i n c r e a se
m u l t i p l i c a t i o n f a c t o r b y 1 0 f o r e a c h p o s i t i o n
i t l i e s f u r t h e r t o l e f t .
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