2260-200 [ETC]
ANALOG ACCELEROMETER MODULE; 模拟加速计模块
| 型号： | 2260-200 |
| 厂家： | 
ETC |
| 描述： | ANALOG ACCELEROMETER MODULE |
| 文件： | 总3页 (文件大小：646K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SILICON DESIGNS, INC
P-CapTM Model 2260
ANALOG ACCELEROMETER MODULE
! Accurate, Easy-to-Use Alternative to
Piezoresistive Accelerometers
! Capacitive Micromachined
! Nitrogen Damped
! 4V Differential Output or
0.5V to 4.5V Single Ended Output
! Fully Calibrated
! Low Power Consumption
! -55 to +85EC Operation
! +8 to +32V DC Power
! Simple Four Wire Connection
ORDERING INFORMATION
! Low Impedance Outputs Will Drive
Up To 15 Meters of Cable
Full Scale
Model
Acceleration
Number
! Responds to DC and AC Acceleration
! Non Standard g Ranges Available
! Rugged Anodized Aluminum Module
! Low Noise
±
±
2 g
5 g
2260-002
2260-005
2260-010
2260-025
2260-050
2260-100
2260-200
± 10 g
± 25 g
± 50 g
±100 g
±200 g
! Serialized for Traceability
DESCRIPTION
The P-CapTM model 2260 accelerometer module combines an integrated model1221L accelerometer with high drive,
low impedance buffering for measuring acceleration in commercial/industrial environments. It is tailored for zero to
medium frequencyinstrumentation applications. Theanodized aluminum case is epoxysealed and is easilymounted
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 thermal 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-CapTM 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 onthe bottom of the package. The signal outputs arefullydifferential
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
! FLIGHT TESTS
! MODAL ANALYSIS
! ROBOTICS
! CRASH TESTING
! INSTRUMENTATION
! VIBRATION MONITORING
! VIBRATION ANALYSIS
! MACHINE CONTROL
P-Cap is a trademark of Silicon Designs, Inc.
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] Apr 07
P-CapTM Model 2260 Analog Accelerometer Module
SIGNAL DESCRIPTIONS
Vs and GND (Power): Red and Black wires respectively. Power
(+9 to +32 Volts DC) and ground.
AOP and AON (Output): Green and White wires respectively.
Analog output voltages proportional to acceleration; AOP voltage
increases (AON decreases) with positive acceleration. At zero
acceleration both outputs are nominally equal to 2.5 volts. The
device experiences positive (+1g) acceleration with its lid facing
up in the Earth’s gravitational field. Either output can be used
individually or the two outputs can be used differentially. (See
output response plot below)
PERFORMANCE - By Model: VS=+8 to +32VDC, TC=25EC
MODEL NUMBER
UNITS
2260-002 2260-005 2260-010 2260-025 2260-050 2260-100 2260-200
Input Range
Frequency Response (Nominal, 3 dB) 1
2
0 - 400
2000
13
5
10
25
50
100
200
g
Hz
0 - 600 0 - 1000 0 - 1500 0 - 2000 0 - 2500 0 - 2500
2
Sensitivity, Differential
800
32
400
63
160
158
80
40
20
mV/g
µg/(root Hz)
g
316
632
1265
Output Noise, Differential (RMS, typical)
Max. Mechanical Shock (0.1 ms)
2000
Note 1: 250Hz ±100Hz, -3dB bandwidth, optionally available.
Note 2: Single ended sensitivity is half of values shown.
PERFORMANCE - All Models: Unless otherwise specified, Vs=+8 to +32VDC, TC=25EC, Differential Mode.
PARAMETER
Cross Axis Sensitivity
MIN
TYP
MAX
UNITS
2
2
2
3
4
3
%
-002
Bias Calibration Error
% of span
-005 thru -200
Bias Temperature Shift
-002 & -005
100
50
300
200
(ppm of span)/EC
(TC= -40 to +80EC)
-010 thru -200
3
Scale Factor Calibration Error
2
3
%
-250
+250
ppm/EC
Scale Factor Temperature Shift (TC= -40 to +80EC)
-002 thru -050
Non-Linearity
0.15
0.25
0.40
>65
1
0.5
1.0
1.5
-100
% of span
3, 4
(-90 to +90% of Full Scale)
-200
Power Supply Rejection Ratio
Output Impedance
50
8
dB
Ω
Output Common Mode Voltage
Operating Voltage
2.5
VDC
32
12
VDC
9
6
mA DC
grams
grams/meter
Operating Current (AOP & AON open)
Mass (not including cable)
Cable Mass
14
Note 3: 100g versions and above are tested from -65g to +65g.
Note 4: Tighter tolerances available upon request.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
P-cap IS A REGISTERED TRADEMARK OF SILICON DESIGNS, INC.
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] Apr 07
P-CapTM Model 2260 Analog Accelerometer Module
CABLE SPECIFICATIONS & LENGTH CONSIDERATIONS
The cable consists of four 28 AWG (7x36) silver plated copper wires with PTFE insulation surrounded by a braided shield. The
shield jacket is a PTFE tape wrap 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.
CONVERTING THE 2260's DIFFERENTIAL OUTPUT TO SINGLE ENDED
C1 = C2 (See below for value calculation)
R1, R2, R3 & R4 = 20kΩ to 50kΩ
R1 = R3 to within 0.1% for good common mode rejection
R2 = R4 to within 0.1% for good common mode rejection
R2 / R1 ratio accurate to within 0.1% for gain control
R4 / R3 ratio accurate to within 0.1% for gain control
To achieve the highest resolution and lowest noise performance from your model 2260 accelerometer module, it should
be connected to your voltage measurement instrument in a differential configuration using both the AOP and AON output
signals. If your measurement instrument lacks differential input capability or you desire to use a differential input capable
instrument in single ended mode, then the circuit above can be used to preserve the low noise performance of the model
2260 while using a single ended type connection.
This circuit converts the 4 Volt differential output of the model 2260 accelerometer, centered at +2.5 Volts, to a single
ended output centered about ground (0.0 Volts). It provides the advantage of low common mode noise by preventing the
accelerometer’s ground current from causing an error in the voltage reading.
The op-amp should be located as close as possible to your voltage monitoring equipment so that the majority of the signal
path is differential. Any noise present along the differential path will affect both wires to the same degree and the op-amp
will reject this noise because it is a common mode signal. The op-amp type is not critical; a µA741 or ¼ of a LM124 can
be used. Both plus and minus supplies are needed for the op-amp to accommodate the positive and negative swings of
the single ended output.
For this design, always set R1 = R3, R2 = R4 and C1 = C2. The gain of the circuit is then determined by the ratio R2/R1.
When R1 = R2 = R3 = R4, the gain equals 1 and the output swing will be 4 Volts single ended with respect to ground. To
obtain a
5 Volt single ended output, set R2/R1 = R4/R3 = 5/4 = 1.25. The single ended output of the op-amp will be
centered at ground if R2 and C1 are tied to ground; using some other fixed voltage for this reference will shift the output.
The value of the optional capacitors C1 and C2 (C1 = C2) can be selected to roll off the frequency response to the frequency
range of interest. The cutoff frequency f0 (-3 dB frequency) for this single order low pass filter is given by:
1
f0
=
2π R2C1
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
P-cap IS A REGISTERED TRADEMARK OF SILICON DESIGNS, INC.
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] Apr 07
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