MODELS 2460 AND 2466
LOW COST 3-AXIS DC ACCELEROMETERS•••••••••••

Low Noise: 10 μg√ Hz Typical for ±2g Full Scale Versions-55 to +125°C Operating Temperature Range
Acceleration and Vibration Sensing Across Three Orthogonal Axes
Excellent Long-Term Stability
Flexible +8 to +32 VDC Power±4V Differential Output or 0.5V to 4.5V Single Ended Output
Responds to frequencies from zero (DC) to 2000+ HzLow Impedance Outputs Support up to 2000 Feet of Cable
Simple Eight (8) Wire Connection, Choice of Integrated Cable orConnector
Rugged Anodized Aluminum Case
Fully Calibrated and Serialized for Traceability

AVAILABLE
G-RANGES
FULL SCALE
ACCELERATIONMODELSUFFIX±2g±5g± 10 g± 25 g± 50 g± 100 g± 200 g± 400 g-002-005-010-025-050-100-200-400

LOW COST ACCELEROMETER MODELS 2460 & 2466
SDI’s Models 2460 and 2466 Low Cost Three-Axis MEMS Variable Capacitive
Accelerometers are rugged plug-and-play measurement devices for suitable for awide array of demanding applications. Both models excel in zero-to-medium
frequency commercial and industrial applications, particularly where reliable
performance, extremely low noise, and long-term stability are absolute requirements.
The 2460 includes a 3-foot integrated cable and are operationally identical to the 2466,
which features a connector for easily customized cable lengths and positions.
Each SDI triaxial accelerometer features three orthogonally mounted low noise accelerometers
within a single, rugged, epoxy sealed, anodized aluminum case. Onboard voltage regulation andan internal voltage reference eliminate the need for precision power supplies. They are
relatively insensitive to temperature changes and gradients. Individual axis directions aremarked on the case with positive acceleration defined as acceleration in the direction of the axis
arrow. The case is easily mounted via two screws, adhesive, or by attaching a magnet.

ZERO (DC) TO MEDIUM FREQUENCY APPLICATIONSPERFORMANCE BY G RANGE
INPUT
RANGE

SENSITIVITY,DIFFERENTIAL*FREQUENCYRESPONSE(TYPICAL, 5%)g±2±5±10±25±50±100±200±400mV/g
2000
80040016080
402010Hz0 – 250
0 – 400
0 – 700
0 – 1300
0 – 1600
0 – 1700
0 – 1900
0 – 2000*FREQUENCYRESPONSE(TYPICAL, 3 DB)*FREQUENCYRESPONSE(MINIMUM, 3 DB)

OUTPUT NOISE,DIFFERENTIAL(RMS, TYPICAL)MAX.
MECHANICALSHOCK (0.1 MS)

Hz0 – 525
0 – 800
0 – 1100
0 – 1750
0 – 2100
0 – 30000 – 3600
0 – 4200

Hz0 – 300
0 – 420
0 – 660
0 – 1050
0 – 1400
0 – 1700
0 – 2100
0 – 2400μg/(root Hz)
1015233860
121243475g (peak)

By Model: VDD=VR=5.0 VDC, TC=25°C

20005000Single ended sensitivity is half of values shown.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

Silicon Designs, Inc. • 13905 NE 128th Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
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15-July-2020

LOW COST 2460 AND 2466 TRIAXIAL ACCELEROMETERSPERFORMANCE - ALL VERSIONSAll Models: Unless otherwise specified, Vs=+8 to +32 VDC, TC=25°C, Differential Mode. Span = ±g range = 8000 mV.

PARAMETER
Bias Calibration Error (%)
Bias Calibration Error (mV)
Scale Factor Calibration Error 1
Non-Linearity (-90 to +90% of span) 1Bias Temperature Shift (Coefficient)
Scale Factor Temperature Shift (Coefficient)
Cross Axis Sensitivity
Power Supply Rejection Ratio
Output Impedance
Output Common Mode Voltage
Operating Voltage
Operating Current (AOP & AON open)
Operating Temperature
Mass (not including cable)
Cable Mass (3’ integrated cable, 2460 & 2460)

MINTYPMAXUNITS-200-200

0.25
25
0.5
0.15
002>65
1
2.5

0.6
60
1.25
0.5
+200+2003± % of span
± mV±%± % of span
(PPM of span)/°C
PPM/°C±%dBΩ
VDC
VDCmA DC
°Cgrams
grams/meter50819-55233227+1252125Note 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.

BIAS & SCALE FACTOR TEMPERATURE SHIFT EXPLAINEDEvery accelerometer has a bias and scale factor temperature coefficient, meaning the output shifts slightly due totemperature changes. Many applications operate within a relatively small temperature band or at room
temperature, and therefore rarely encounter interference from the bias or scale factor temperature shifts. Thesecustomers are ideal candidates for SDI’s Low-Cost accelerometer modules.
For applications experiencing larger temperature variations (i.e. exposure to engine temperatures or arctic testing)
SDI suggests the upgraded Premium accelerometer modules, 2470 and 2476. These have enhanced, temperaturecompensated, proprietary SDI Model 1522 accelerometer chips, which are individually tested, calibrated and verified
in a climate chamber to provide the most accuracy and come with an initial calibration certificate.
The accelerometer output with no acceleration present. For SDI’s differential output analog
Biasaccelerometers, it is a signed quantity that is expressed in terms of either g or output volts and isideally equal to zero g or zero volts.
The ratio of the change in output to a unit change in the input acceleration expressed in millivolts perg (mV/g). Since the output of most accelerometers is slightly non-linear, the scale factor value is
Scale Factor
defined as the slope of the least-squares-fit line to the acceleration input vs output curve. SDI
measures over the range of -90% to +90% of full scale or from -65g to +65g, whichever is smaller.
The amount of bias shift to expect with a change in temperature expressed as PPM of span per °C.
BiasFor example, the percent of span bias shift that would occur for a 25g full scale device with a +/-200
Temperature PPM of span per °C rating and a 55 °C rise from room temperature would be: +/-200 / 1,000,000 x(80C - 25C) x 100% of span = +/-1.1% of span. The g shift would be +/-1.1% of 50g = 0.55 g. This error
Shift(Coefficient) in terms of output voltage for a 25 g analog accelerometer would be +/-1.1% of span = +/-1.1% of 8 V= 88 mV.
The amount of scale factor shift to expect with a change in temperature expressed as PPM per °C.
Scale Factor
For example, the percent shift in scale factor that would occur for a device with a +200 PPM per °C
Temperature
rating and a 60 °C rise from room temperature would be: +200 / 1,000,000 x (85C - 25C) x 100% =Shift+1.2%. For an analog 10g device, the scale factor would rise from its nominal (8 V)/(20 g) = 400 mV/g(Coefficient)
at +25C to 400 mV/g +1.2% = 404.8 mV/g.


SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Silicon Designs, Inc. • 13905 NE 128th Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
www.silicondesigns.com[page 2]15-July-2020

LOW COST 2460 AND 2466 TRIAXIAL ACCELEROMETERSOPERATION
SDI’s Universal Triaxial MEMS Variable Capacitive Accelerometers provide optimal performance when they areconnected to instrumentation in a differential configuration using both the AOP and AON output signals, but still
support single ended operation for complete flexibility.
These Accelerometers produce three differential analog output voltage pairs (AON & AOP) which vary withacceleration. The signal outputs are fully differential about a common mode voltage of approximately 2.5 volts. At
zero acceleration, the output differential voltage is nominally 0 volts DC; at ±full scale acceleration, the output is ±4
volts DC, respectively, as shown in the figure (below). The output scale factor is independent from the supply voltageof +8 to +32 volts.
When a differential connection is not possible, SDI recommends connecting the accelerometer to instrumentationin single ended mode by connecting AOP and GND to the instrumentation and leaving AON disconnected. Keep inmind that the signal to noise ratio is reduced by half for a single-ended vs. a differential connection.

CABLE SPECIFICATIONS
2460: The SDI 2460 has an integrated 3’ cable with strain relief attached at the connection to the case and consistsof seven 28 AWG (7x36) and one 26 AWG (7x34) tin-plated copper wires. The seven smaller 28 AWG wires are coveredby 5.5 mils of Teflon FEP insulation. The large single 26 AWG wire is covered by 8.5 mils of black Teflon FEP
insulation. The seven smaller gauge wires surround the single larger gauge (black) wire. The cable’s braided
shield is electrically connected to the case. The black ground (GND) wire is isolated from the case. The wire bundle
is surrounded by a braided shield and covered by a 10 mil thick Teflon FEP jacket with a nominal outer diameter of0.136”.
2466: The SDI 2466 has a 9-pin connector; the cable consists of eight 26 AWG tin-plated copper wires and only eightpins are used for the 8-wire cable. All eight of the 26 AWG wires are covered by 8.5 mils of Teflon insulation.

2466 CABLE LENGTHS
The 8PIN-CAB is available in five standard lengths, and custom lengths may be available for special order.
NAME
8PIN-CAB-04
8PIN-CAB-10
8PIN-CAB-20
8PIN-CAB-33
8PIN-CAB-50

LENGTH - FEET
4 Feet10 Feet20 Feet
33 Feet50 FeetLENGTH - METERS (APPROXIMATE)
1.2 Meters
3 Meters
6 Meters
10 Meters
15.4 Meters

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
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LOW COST 2460 AND 2466 TRIAXIAL ACCELEROMETERSCABLE LENGTH CONSIDERATIONS
Cable lengths of up to 50 feet (15 meters) can be used without the need to test for output instability. For cablelengths exceeding 50 feet, SDI recommends checking each individual installation for oscillation by tapping theaccelerometer and watching the differential output for oscillation in the 20 kHz to 50 kHz region. If no oscillation ispresent, extended cable length should behave as expected. From the standpoint of output current drive and slew
rate limitations, all SDI 8-32 VDC Accelerometers are capable of driving over 2000 feet (600 meters) of cable.
However, at some length ranging between 50 feet and 2000 feet, each device will likely begin to exhibit oscillation.

RECOMMENDED CONNECTIONS - DIFFERENTIAL
SDI Models 2460 and 2466 Accelerometers provide optimal performance when they are connected toinstrumentation in a differential configuration using both the AOP and AON output signals.

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
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LOW COST 2460 AND 2466 TRIAXIAL ACCELEROMETERS

RECOMMENDED CONNECTIONS – SINGLE ENDEDSingle ended operation is also possible with minor changes to the wiring configuration, as described below.

ALTERNATIVE MODELSThe Silicon Designs Models 2210, 2260, and 2266 are the single
axis versions of the 2460 and 2466 and come in multiple sizes tocomplement the triaxial configurations.
The 2210 comes in a traditional 1-inch square package with an
integrated cable. They are operationally identical to the 2260
and 2266, the small footprint devices designed for tight spaces.

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
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LOW COST 2460 AND 2466 TRIAXIAL ACCELEROMETERS

2460 DIMENSIONS

2460-XXXYInch [mm]>@Z>@XXXX

6 ,/,& 21'(6 ,*1 62460-XXX

Z =

 ;< ;9'&Z
X ;< =X

6>@6 ,/,&21'(6,* 1 6X

>@

>@XXXX
X

>@',$9'&>@>@>@>@6(5,$/
>@

>@>@

YX

ZYX

 ;
 < =Inches

 <2466 DIMENSIONS>@>@>@',$

2466-XXX
YX>@XXXX

>@6,/,&21' (6 , * 1 6Z.(<$21=*1'
96$23;$23=$21<$21;
$23<>@>@>@>@9'&X>@6(5,$/>@Inch [mm]9'&XXXX

2466-XXX

ZZXX

YZ

YX

 ;
 <

 ;<X

6,/,&21'(6 ,* 1 6
 =

 ;< = ;

 =

 <All measurements are in inches

Data sheets dated 1-November-2015 and newer apply to 2460 and 2466 serial numbers above 2000.
Contact SDI for data sheets pertaining to prior parts with serial number below 2000.

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
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

LOW COST 2460 AND 2466 TRIAXIAL ACCELEROMETERSCALIBRATION REPORT EXAMPLESLINEARITY, PHASE & FREQUENCY RESPONSE BY G-LEVELThe optional calibration reports provide additional information about the linearity, output, phase, and frequency
response as tested for each individual unit. The following are examples of the graphical data supplied on calibration
reports, by G-level.

EXAMPLE 2G

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

LOW COST 2460 AND 2466 TRIAXIAL ACCELEROMETERS



EXAMPLE 5G

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

LOW COST 2460 AND 2466 TRIAXIAL ACCELEROMETERS



EXAMPLE 10G

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LOW COST 2460 AND 2466 TRIAXIAL ACCELEROMETERS



EXAMPLE 25G

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

LOW COST 2460 AND 2466 TRIAXIAL ACCELEROMETERS



EXAMPLE 50G

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LOW COST 2460 AND 2466 TRIAXIAL ACCELEROMETERS



EXAMPLE 100G

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

LOW COST 2460 AND 2466 TRIAXIAL ACCELEROMETERS



EXAMPLE 200G

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LOW COST 2460 AND 2466 TRIAXIAL ACCELEROMETERS



EXAMPLE 400G

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