SDI 1531 SURFACE MOUNT ACCELEROMETERS

SDI Model 1531 Accelerometer
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The Model 1531 high-temperature, industrial-grade MEMS DC accelerometer features identical performance specifications to the Model 1521, however the Model 1531 is additionally designed and built with high-temperature materials and undergoes rigorous temperature conditioning protocols.  Each accelerometer is nitrogen damped, hermetically sealed, and carefully tested within a climate chamber environment to ensure its continued reliable operation in temperatures as high as +175°C.

AVAILABLE

G-RANGES

± 2 g

± 5 g

± 10 g

± 25 g

± 50 g

± 100 g

± 200 g

± 400 g

  • Low Noise: 7 μg/rootHz Typical for ±2g Full Scale Versions

  • -55 to +175°C Operation

  • Responds to frequencies from zero (DC) to 2000+ Hz

  • High Stability and Durability

  • ±4V Differential Output

  • +5 VDC, 5 mA Power (Typical)
  • Integrated Sensor & Amplifier

  • Internal Temperature Sensor

  • Nitrogen Damped & Hermetically Sealed

  • Serialized for Traceability

  • RoHS Compliant

Quick Links

Each miniature, hermetically sealed package combines a MEMS capacitive sense element for DC measurement and a custom integrated circuit that includes a sense amplifier and differential output stage.  Each device is individually tested, programmed, calibrated by SDI, as well as marked with a serial number on its top and bottom surfaces for traceability.  A calibration test report (1531-TST) is provided with every unit showing the measured bias, scale factor, linearity, operating current, & frequency response.

ZERO TO MEDIUM FREQUENCY APPLICATIONS

Applications fro SDI Model 1531 Accelerometers
g Range
Sensitivity, Differential
Frequency Response (Typ, 3 dB)
Frequency Response (Min, 3 dB)
Frequency Response (Typ, 5%)
Output Noise, Differential (RMS, Typ)
Max. Mechanical Shock (0.1 ms)
g
mV/g
Hz
Hz
Hz
μg/(root Hz)
g (peak)
±2
2000
0 – 525
0 – 300
0 – 250
7
2000
±5
800
0 – 800
0 – 420
0 – 400
12
2000
±10
400
0 – 1100
0 – 660
0 – 700
18
5000
±25
160
0 – 1750
0 – 1050
0 – 1300
25
5000
±50
80
0 – 2100
0 – 1400
0 – 1600
50
5000
±100
40
0 – 3000
0 – 1700
0 – 1700
100
5000
±200
20
0 – 3600
0 – 2100
0 – 1900
200
5000
±400
10
0 – 4200
0 – 2400
0 – 2000
400
5000

OPERATION

The model 1531 sensitive axis is perpendicular to the bottom of the package, with positive acceleration resulting from a positive force pushing on the bottom of the package. The seismic center is located on a centerline through the dual sense elements and halfway between them. 

The Model 1531 produces a differential +/-4 volts output voltage, the value of which varies with acceleration as shown in the figure. The seismic center is located on a centerline through the dual sense elements halfway between them.  Any errors due to rotation about this point are effectively cancelled by the internal electronics.

Two reference voltages, +5.0 and +2.5 volts (nominal), are required; scale factor is ratiometric to the +5.0 volt reference voltage relative to GND, and both outputs at zero acceleration are nominally the same as the +2.5 volt input.  

Differential Signal plot

PERFORMANCE - ALL VERSIONS

All Models: Unless otherwise specified, Vs=+8 to +32 VDC, TC=25°C, Differential Mode.  Span = ±g range = 8000 mV.

Note (1): For 2g thru 50g only; 100g and greater versions are tested and specified from -65 to +65g.

NOTICE:  Stresses greater than those listed may cause permanent damage to the device.  These are maximum stress ratings only.  Functional operation of the device at or above these conditions is not implied.

PACKAGE DIMENSIONS

J Package drawing

Please see the data sheet for sensor location and other additional details. 

OPTIONAL ACCESSORY

Model EB-J Analog Test Set

​The Model EB-J Analog Test Set provides a convenient means of testing and evaluating SDI Model 1531 surface mount accelerometers. 

The zero-insertion-force socket is pre-fitted to the board, which includes set jumpers for advanced features of SDI accelerometers. A 10-pin connector and ribbon cable provide connections to the user's test equipment.

The EB-J Analog Test Set and SDI Surface Mount Accelerometers are each sold separately.

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