Product Manual

6.2 THE CALIBRATION RECORD
A Calibration Record is supplied with every planimeter.. It shows the "u" values of
the instrument, which are needed to determine the measuring constants.
Example of a Model 30 Calibration Record: (varies between instruments)
u - (English)_______ 0.02010
u - (Metric) _______ 0.12971
u - (English)_______ 0.01368
u - (Metric) _______ 0.08831
u - (English)_______ 0.00878
u - (Metric) _______ 0.05669
A
T
(English) ______
A
T
(Metric) ______
for u = 0.01 in
2
....12.07
for u = 0.1 cm
2
....17.99
TRACER ARM SETTING SHOWN:
13.98
13.98
the eighth line (counting to the left
from the index) is aligned with a
division line of the tracer arm.
THE TRACER ARM OF
MODEL 30 CAN BE SET TO
A PRECALIBRATED LENGTH
FOR 1:1 MEASUREMENTS
Fig. 9
These values are
chosen for demo
purposes only.
LONG TRACER ARM
MEDIUM TRACER ARM
SHORT TRACER ARM
TEST AREA
TRACER ARM SETTING
for 1:1 MEASUREMENTS
The tracer arm of your model 30 may be graduated in mm or half mm intervals. If you have half mm
intervals, simply ignore the half mm divisions and set the arm length using only the mm lines.
The line drawings above show a setting of 13.98 cm.
Full cm and the 1/10
th
cm graduation lines are located to the right of the index line 0.
The 1/100
th
cm division is the vernier line (always to the left of the index line 0) , which is best
aligned with a dividing line of the arm.
Page 6
"u" values for
several arm ex-
tension are pro-
vided to assure
maximum flexi-
bility and optimal
results.
Values shown
are for demo
purposes only.
Yours may be
different !