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SILICON DESIGNS, INC
Model 2430 TRIAXIAL ANALOG ACCELEROMETER MODULE
! 3 Axis Acceleration Sensing ! Capacitive Micromachined ! Nitrogen Damped ! 5V Single Ended Outputs ! Fully Calibrated ! Low Power Consumption ! -40 to +85EC Operation E ! 11 to 16 VDC Power ! 6 Wire Connection ! Serialized for Traceability ! Responds to DC & AC Acceleration ! Outputs Referenced to External Ground ! Non Standard g Ranges Available ! Rugged Black Anodized Aluminum Module
ORDERING INFORMATION Full Scale Model Acceleration Number 2g 5g 10 g 25 g 50 g 100 g 200 g 2430-002 2430-005 2430-010 2430-025 2430-050 2430-100 2430-200
DESCRIPTION
The Model 2430 triaxial accelerometer combines three orthogonally mounted Model 1210 accelerometers in a rugged case for measuring accelerations in commercial and industrial environments. It is tailored for zero to medium frequency instrumentation applications. The anodized aluminum case is epoxy sealed and is easily mounted via two #8 (or M4) screws. The design includes an instrumentation amplifier on each axis providing high drive capability and low output impedance. On-board voltage regulation and an internal voltage reference eliminate the need for precision power supplies. No power supply current flows through the OUTPUT REF wire; this high impedance input is used only as a reference for the acceleration outputs which reduces cross talk among the three channels by rejecting noise from voltage differences between the user's data acquisition equipment and power supply grounds. The 2430 is relatively insensitive to temperature changes and gradients. An optional initial calibration sheet (2430-CAL) and periodic calibration checking are also available.
OPERATION
The Model 2430 produces three analog voltage outputs which vary with acceleration. The Z axis is perpendicular to the bottom of the package, with positive acceleration defined as a force pushing on the bottom of the package. The X and Y axis directions are marked on the cover with positive acceleration defined as acceleration in the direction of the axis arrow. The outputs are single ended and vary with respect to the voltage at the OUTPUT REF input which should be approximately centered between the +VS and -VS supply voltages. The output scale factor is independent of the supply voltages from 12 to 16 volts. At zero acceleration, the output voltage is nominally zero volts; at full scale acceleration the output voltage is 5 volts respectively.
APPLICATIONS
VIBRATION MONITORING VIBRATION ANALYSIS CRASH TESTING ROBOTICS MACHINE CONTROL INSTRUMENTATION MODAL ANALYSIS ROTATING MACHINERY MONITOR
Silicon Designs, Inc. ! 1445-NW Mall Street, Issaquah, WA 98027-5344 ! Phone: 425-391-8329 ! Fax: 425-391-0446 web site: www.silicondesigns.com [page 1] Jan 08
Model 2430 Triaxial Analog Accelerometer Module
SIGNAL DESCRIPTIONS
+VS (Power): Reddish brown wire. Apply +11 to +16 Volts
DC with respect to OUTPUT REF.
-VS (Power): Black wire. Apply -11 to -16 Volts DC with
respect to OUTPUT REF.
OUTPUT REF (Input): White wire. The X, Y & Z outputs
are referenced to this potential. This input is usually tied to a potential halfway between the +VS and -VS voltages. This input may also be used to offset the output but the voltage difference between this input and either supply voltage (+VS or -VS) must be greater than or equal to 7V.
X, Y & Z (Outputs): Green, Light Brown & Light Blue wires
respectively. These output voltages are proportional to acceleration; they increase with positive acceleration and decrease with negative acceleration. At zero acceleration the output is nominally equal to zero volts with respect to OUTPUT REF.
PERFORMANCE - By Model: VS=12 to 16VDC, TC=25EC.
MODEL NUMBER Input Range 2430-002 2430-005 2430-010 2430-025 2430-050 2430-100 2430-200 5 0 - 400 1000 38 10 25 50 100 200 0 - 600 0 - 1000 0 - 1500 0 - 2000 0 - 2500 500 76 200 190 2000 100 380 50 760 25 1520 UNITS g Hz mV/g g/(root Hz) g 2 Frequency Response (Nominal, 3 dB) 0 - 300 Sensitivity 2500 Output Noise (RMS, typical) 15 Max. Mechanical Shock (0.1 ms)
PERFORMANCE - All Models: Unless otherwise specified VS=12 to 16VDC, TC=25EC.
PARAMETER Cross Axis Sensitivity Bias Calibration Error Bias Temperature Shift (TC= -40 to +85EC) Scale Factor Calibration Error
1
MIN -002 -005 thru -200 -002 & -005 -010 thru -200
TYP 2 2 100 50 2 +300 0.5 0.7 >65 1
MAX 3 4 3 300 200 3 1.0 1.5
UNITS % % of span (ppm of span)/EC % ppm/EC % of span dB Ohm V mA grams grams/meter
Scale Factor Temperature Shift (TC= -40 to +85EC) Non-Linearity -002 thru -100 (-90 to +90% of Full Scale) 1 -200
Power Supply Rejection Ratio 50 Output Impedance Operating Voltage (VS) 11 2 16 3 Operating Current (X, Y & Z outputs open) 30 40 Mass (not including cable) 30 Cable Mass 15 Notes: 1. 100g versions and above are tested from -65g to +65g. 2. Operation with VS below 12V may result in some performance degradation. 3. Power source must be capable of providing 3 times the operating current at turn-on.
Silicon Designs, Inc. ! 1445-NW Mall Street, Issaquah, WA 98027-5344 ! Phone: 425-391-8329 ! Fax: 425-391-0446 web site: www.silicondesigns.com [page 2] Jan 08
Model 2430 Triaxial Analog Accelerometer Module
CABLE SPECIFICATIONS & LENGTH CONSIDERATIONS
The cable consists of six 28 AWG (7x36) tin plated copper wires with FEP insulation. The cable jacket is an FEP tape wrap with a nominal outer diameter of 0.125". Cable lengths of up to 15 meters (50 feet) can be added to the model 2430's standard 1 meter cable without the need to test for output instability. For lengths longer than 15 meters we recommend you check each individual installation for oscillation by tapping the accelerometer and watching the differential output for oscillation in the 20kHz to 50kHz region. If no oscillation is present then the cable length being used is OK. From the standpoint of output current drive and slew rate limitations, the model 2430 is capable of driving over 600 meters (2000 feet) of its cable type but at some length between 15 and 600 meters, each device will likely begin to exhibit oscillation.
SENSOR LOCATIONS
SINGLE SUPPLY OPERATION
The model 2430 can be powered using a single +20 to +32V supply but two additional resistors are needed and you must make the following connections. Connect the -VS wire to your power supply's ground. Connect the +VS wire to the positive output of your power supply VP. Connect one resistor (RUPPER) between your supply voltage and the OUTPUT REF wire. Connect another resistor (RLOWER) between ground and the OUTPUT REF wire. The two resistors form a resistive divider which creates a +5V source for OUTPUT REF. This +5V reference needs to have a source impedance of about 1000 so use the following equations to calculate values for the resistors depending upon your supply voltage VP.
R LOWER =
1000 V P VP - 5
V P - 5 RUPPER = R LOWER 5
For this mode of operation, the voltage swing of the three outputs is limited to 8V (+1 to +9V) so the g-range over which each model will operate is reduced according to the table below.
MODEL NUMBER Input Range (single supply mode) Sensitivity Output Range (single supply mode) 2430x-002 2430x-005 2430x-010 2430x-025 2430x-050 2430x-100 2430x-200 1.6 2500 4 1000 8 500 20 40 200 100 8V (+1 to +9V) 80 50 160 25 UNITS g mV/g Volts
A custom version of the model 2430 that can operate with a single supply as low as 12V can be special ordered but a custom order charge may apply for quantities less than 10.
Silicon Designs, Inc. ! 1445-NW Mall Street, Issaquah, WA 98027-5344 ! Phone: 425-391-8329 ! Fax: 425-391-0446 web site: www.silicondesigns.com [page 3] Jan 08

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