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Atec Endevco-25B User Manual

Isotron, Accelerometer, Model 25b

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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