Data Sheet for 2260 Accelerometer by Silicon Designs

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DATA SHEET - 2260 1-AXIS ACCELEROMETER

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Single 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	2260-002 2260-005 2260-010 2260-025 2260-050 2260-100 2260-200 2260-400

DESCRIPTION
The P-Cap^_TM model 2260 accelerometer module combines an integrated model 1221L accelerometer with high drive, low impedance buffering for measuring acceleration in commercial/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 #4 (or M3) screws. On-board regulation is provided to minimize the effects of supply voltage variation. It is relatively insensitive to temperature changes and gradients. The cable’s shield is electrically connected to the case while the ground (GND) wire is isolated from the case. An optional initial calibration sheet (2260-CAL) and periodic calibration checking are also available.

OPERATION
The P-Cap^TM Model 2260 accelerometer module produces two analog voltage outputs which vary with acceleration as shown in the graph on the next page. The sensitive axis is perpendicular to the bottom of the package, with positive acceleration defined as a force pushing on the bottom of the package. 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 differential voltage is ±4 volts DC respectively.

APPLICATIONS
• Vibration Monitoring and Analysis
• Machine Control
• Modal Analysis
• Robotics
• Crash Testing
• Instrumentation
• Flight Tests

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)
2260-002	±2	0 - 400	2000	13	2000 g
2260-005	±5	0 - 600	800	32
2260-010	±10	0 - 1000	400	63
2260-025	±25	0 - 1500	160	158
2260-050	±50	0 - 2000	80	316
2260-100	±100	0 - 2500	40	632
2260-200	±200	0 - 3000	20	1265
2260-400	±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
	-200		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)			9	12	mA DC
Mass (not including cable)			6		grams
Cable Mass			14		grams/m

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 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 model 2260'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 2260 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

DIFFERENTIAL vs. SINGLE ENDED OPERATION
The model 2260 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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