dike’ ite Xoediany
with a motor driven disc table was used for all calibrations.
By
setting the mount at varying distances from the axis and varying the
speed of the centrifuge motor each element was exposed to its expected
range of accelerations. The axis of each element was oriented on a
tangent to a radius from the center of the recording disc to obtain
optimum results.
Fach element has a calibration disc so marked and
kept as a permanent record of the calibration. A laboratory microscope
was used to read the deflection in mils, of the corresponding
400
—.
ELEMENT F w/s A
/
a~ STATIC
©- DYNAMIC
24 AUGUST 54
/
200
°
pisces
sehalbmuinraette
‘
OEFLECTION IN MILS
ve ttt bey
300
a
Figure E.l
10
20
ACCELERATION IN G'S
,
30
Typical statieand dynamic calibration
curve of an air accelerometer element.
accelerations applied to each el
t.
From the compiled results a
tester.
Dynamic Calibrations
le ease tate
E.3.2
iPSthaysantte
calibration curve of deflection in mils Vbrsus acceleration in G's was
drawn for each element.
The elements were also given a dynamic'cablibration on 8 drop
‘This tester is known as the "NOL Drop Tester (12") Type 1A".
The mount used on the centrifuge was also used.for the drop test.
By
varying the drop heights and the lead slugs on the anvil, each element
was exposed to selected values of accelerations. The axis of each
element was oriented tangent to the radius of the dist ith cain optimum
results.
Typical calibration curves of voth static ands/dynamic
accelerations are piotted in Figure E.1l.
79