Atec Endevco-25B - Manual

ENDEVCO
MODEL
25B
ISOTRON ® Accelerometer
Model 25B
• Low Impedance Output
• World's Smallest ISOTRON
®
• Detachable Coaxial Cable
• Light Weight (0.2 gm)
• Ground Isolated
DESCRIPTION
The ENDEVCO ® Model 25B ISOMIN ™ is an
extremely small, adhesive mounted piezoelectric accel-
erometer with integral electronics, designed specifically
for measuring vibration on very small objects. The
unit weighs only 0.2 gm, reducing unwanted mass
loading effects. The "B" version of Model 25 offers a
flexible, detachable coaxial cable which can be replaced
by the user in the field. This feature provides extended
service life when repetitive installations or heavy use
are expected. As with the "A" version, Model 25B is
ideal for measuring vibration in scaled models, small
electronic components, and biomedical research. An
optional triaxial mounting block (Model 2950M16) is
available for setting up three-axis measurement.
The Model 25B features ENDEVCO’s PIEZITE ® Type
sensing element operating in shear mode. The internal
electronics inside the accelerometer convert high
impedance input into low impedance voltage output
through the same cable that supplies the required 4 mA
constant current power. Signal ground is isolated from
the mounting surface of the unit by a hard anodized
surface. A removal tool is included for proper removal
in the field. A 4,000 g’s full scale range is available in
the 25BM1 version.
ENDEVCO Signal Conditioner Models 133, 4416B,
2792B, 2793, 2775A (set to 4 mA ± 0.5 mA), are
recommended for use with this accelerometer.
-20
-15
-10
-5
0
5
10
15
20
1 10 100 1000 10000 100000
% DEVIATION
FREQUENCY IN HERTZ
TYPICAL AMPLITUDE RESPONSE
-20
-15
-10
-5
0
5
10
15
20
-60 20 100 180 260
% DEVIATION
TEMPERATURE o F ( o C)
TYPICAL TEMPERATURE RESPONSE
(-51) (-7) (38) (82) (127)
Actual size Optional triaxial
mounting block
STANDARD TOLERANCE
INCHES (MILLIMETERS)
.XX = +/- .03 (.X = +/- .8)
.XXX = +/- .010 (.XX = +/- .25)
.036 DIA COAXIAL CABLE
MODEL 3006-120 CABLE
(REMOVABLE - SUPPLIED
ATTACHED TO ACCELEROMETER)
10-32 COAXIAL PLUG
UNIT IDENTIFICATION
.108
(2.74)
.065
(1.65)
.150
(3.81)
.225
(5.72)
R FULL
SERIAL NUMBER
APPLIES TO CALIFORNIA FACILITY