Data Sheet for 2470 Accelerometer by Silicon Designs

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DATA SHEET - 2470 TRIAXIAL ACCELEROMETER

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3 Axis Acceleration Sensing
Capacitive Micromachined
Nitrogen Damped
±4V Differential Output or 0.5V to 4.5V Single Ended Output
Fully Calibrated
Low Power Consumption
+8 to +32V DC Power
-55 to +110°C Operation at 32V, -55 to +125°C at 26V or less
Eight (8) Wire Connection
Low Impedance Outputs Will Drive Up To 15 Meters of Cable
Responds to DC and AC Acceleration
Non Standard g Ranges Available
Rugged Anodized Aluminum Module
Low Noise
Serialized for Traceability

Full Scale Acceleration	Model Number
± 2 g ± 5 g ± 10 g ± 25 g ± 50 g ±100 g ±200 g	2470-002 2470-005 2470-010 2470-025 2470-050 2470-100 2470-200

DESCRIPTION
The Model 2470 triaxial accelerometer is a high temperature version of our popular 2460 triaxial device. It combines three orthogonally mounted model 1221L accelerometers in a rugged case for measuring accelerations in commercial/industrial environments. This module is tailored for zero to medium frequency instrumentation applications. Its anodized aluminum case is epoxy sealed and is easily mounted via two #8 (or M4) screws. On-board voltage regulation and an internal voltage reference eliminate the need for precision power supplies. It is relatively insensitive to temperature changes and gradients. An initial calibration sheet (2470-CAL) is included and periodic calibration checking is also available.

OPERATION
The Model 2470 produces three differential analog output voltage pairs (AON & AOP), which vary with acceleration as shown in the figure (at right). The signal outputs are fully differential about a common mode voltage of approximately 2.5 volts. The output scale factor is independent from the supply voltage of +8 to +32 volts. At zero acceleration the output differential voltage is nominally 0 volts DC; at ±full scale acceleration the output is ±4 volts DC respectively. The axis directions are marked on the case with positive acceleration defined as acceleration in the direction of the axis arrow.

APPLICATIONS

Vibration Monitoring and Analysis
Machine Control
Modal Analysis
Robotics
Crash Testing
Instrumentation
Rotating Machinery Control

SIGNALS
VS: (Power) reddish brown wire
GND: (Ground) black wire
AOPX: (Output) green wire       X-Axis positive output
AONX: (Output) white wire       X-Axis negative output
AOPY: (Output) light brown wire Y-Axis positive output
AONY: (Output) orange wire       Y-Axis negative output
AOPZ: (Output) light blue wire       Z-Axis positive output
AONZ: (Output) yellow wire       Z-Axis negative output

DESIGN

Silicon Designs 2470 Accelerometer Module

PERFORMANCE
By Model: VS=+8 to +32VDC, TC=25°C.

MODEL NUMBER	Input Range	Frequency Response (Nominal, 3 dB) ¹	Sensitivity, Differential ²	Output Noise, Differential (RMS, typical)	Max. Mechanical Shock (0.1 ms)
UNITS	g	Hz	mV/g	μg/(root Hz)
2470-002	±2	0 - 400	2000	12	2000 g
2470-005	±5	0 - 600	800	14
2470-010	±10	0 - 1000	400	15
2470-025	±25	0 - 1500	160	38
2470-050	±50	0 - 2000	80	75
2470-100	±100	0 - 2500	40	150
2470-200	±200	0 - 3000	20	300

Note 1: 250Hz ±100Hz, -3dB bandwidth, optionally available.
Note 2: Single ended sensitivity is half of values shown.

All Models: Unless otherwise specified, Vs=+8 to +32VDC, TC=25°C, Differential Mode.

PARAMETER		MIN	TYP	MAX	UNITS
Cross Axis Sensitivity			2	3	%
Bias Calibration Error	-002			4.0	% of Span
Bias Calibration Error	-005 thru -200			1.5	% of Span
Bias Temperature Shift (T_C= -40 to +80°C)	-002		100	200	(ppm of span)/°C
Bias Temperature Shift (T_C= -40 to +80°C)	-005 thru -200		50	100	(ppm of span)/°C
Scale Factor Calibration Error³			1	2	%
Scale Factor Temperature Shift (TC= -40 to +80°C)	-002 thru -010	-250		+150	ppm/°C
Scale Factor Temperature Shift (TC= -40 to +80°C)	-025 thru -200	-150		+150	ppm/°C
Non-Linearity (-90 to +90% of Full Scale) ^{3, 4}	-002 thru -050		0.15	0.5	% of span
	-100		0.25	1.0
	-200		0.40	1.5
Power Supply Rejection Ratio		50	>65		dB
Output Impedance			1		Ω
Output Common Mode Voltage			2.5		VDC
Operating Voltage (reduce max by 0.4V/°C above 110°C)		8		32	VDC
Operating Current (AOP & AON open)			27	30	mA DC
Mass (not including cable)			21		grams
Cable Mass			14		grams/meter

Note 3: 100g versions and above are tested from -65g to +65g.
Note 4: Tighter tolerances may be available upon request.

CABLE SPECIFICATION & LENGTH CONSIDERATIONS
The cable consists of four 28 AWG (7x36) tin plated copper wires with Teflon FEP insulation surrounded by a 40 AWG tin plated copper braided shield. The shield jacket is Teflon FEP with a nominal outer diameter of 0.096”. Cable lengths of up to 15 meters (50 feet) can be added to the 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 2470 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 LOCATION
SDI-2470 Sensor Location

DIFFERENTIAL vs. SINGLE ENDED OPERATION
The model 2470 accelerometer will provide its best performance when you connect it to your instrumentation in a differential configuration using both the AOP and AON output signals. But a differential connection may not always be possible. In such cases, it is perfectly fine to connect the accelerometer to your instrumentation in single ended mode by connecting AOP and GND to your instrumentation and leaving AON disconnected. Keep in mind however, that for a single-ended connection, the signal to noise ratio is reduced by half, the signal is more susceptible to external noise pickup, and the accelerometer=s output will vary directly with any change in the +2.5V reference that you provide.

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