Data Sheet for 2460 Accelerometer by Silicon Designs

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DATA SHEET - 2460 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
-40 to +85°C Operation
+8 to +32V DC Power
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
Good Noise Performance
Serialized for Traceability

Full Scale Acceleration	Model Number
± 2 g ± 5 g ± 10 g ± 25 g ± 50 g ±100 g ±200 g ±400 g	2460-002 2460-005 2460-010 2460-025 2460-050 2460-100 2460-200 2460-400

DESCRIPTION
The Model 2460 triaxial accelerometer is a three-axis version of our popular 2260 single axis 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 optional initial calibration sheet (2460-CAL) and periodic calibration checking are also available.

OPERATION
The Model 2460 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

Note: The cable’s braided shield is electrically connected to the case. The black ground (GND) wire is isolated from the case.

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)
2460-002	±2	0 - 400	2000	13	2000 g
2460-005	±5	0 - 600	800	32
2460-010	±10	0 - 1000	400	63
2460-025	±25	0 - 1500	160	158
2460-050	±50	0 - 2000	80	316
2460-100	±100	0 - 2500	40	632
2460-200	±200	0 - 3000	20	1265
2460-400	±400	0 - 4000	10	2530

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		2	4	% of Span
Bias Calibration Error	-005 thru -400		2	3	% of Span
Bias Temperature Shift (T_C= -40 to +80°C)	-002		100	300	(ppm of span)/°C
Bias Temperature Shift (T_C= -40 to +80°C)	-005 thru 400		50	200	(ppm of span)/°C
Scale Factor Calibration Error³			2	3	%
Scale Factor Temperature Shift (TC= -40 to +80°C)		-250		+250	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
	-200HOME PRODUCTS REQUEST QUOTE REFERENCE DOCS CONTACT COMPANY Copyright Silicon Designs, Inc. 2011. All rights reserved		0.40	1.5
	-400		0.70	2.0
Power Supply Rejection Ratio		50	>65		dB
Output Impedance			1		Ω
Output Common Mode Voltage			2.5		VDC
Operating Voltage		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 available upon request.

CABLE SPECIFICATION & LENGTH CONSIDERATIONS
The cable consists of seven 28 AWG (7x36) and one 26 AWG (7x34) tin-plated copper wires. The seven smaller 28 AWG wires are covered by 5.5 mils of Teflon FEP insulation. The larger 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 wire bundle is surrounded by a braided shield and covered by a 10 mil thick Teflon FEP jacket with a nominal outer diameter of 0.136”. Cable lengths of up to 15 meters (50 feet) can be added to the model 2460'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 2460 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

DIFFERENTIAL vs. SINGLE ENDED OPERATION
The model 2460 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 that the signal to noise ratio is reduced by half for a single-ended vs. a differential connection.

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