2240-CAB-33 [ETC]

ANALOG ACCELEROMETER MODULE; 模拟加速计模块


型号：	2240-CAB-33
厂家：	ETC
描述：	ANALOG ACCELEROMETER MODULE 模拟加速计模块
文件：	总3页 (文件大小：456K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SILICON DESIGNS, INC

Model 2240

ANALOG ACCELEROMETER MODULE

! Hermetically Sealed Titanium Case

! Detachable Cable (sold separately)

! Capacitive Micromachined

! Nitrogen Damped

! 4V Differential Output or

0.5V to 4.5V Single Ended Output

! Fully Calibrated

ACTUAL SIZE

(CABLE SOLD SEPARATELY)

! Low Power Consumption

! -55 to +125EC Operation

! +9 to +32V DC Power

! Simple Four Wire Connection

ORDERING INFORMATION

Accelerometer

Model

Cable

Model

Number

Full Scale

Acceleration

Cable

Length

Number

! Low Impedance Outputs Will Drive

Up To 50 Feet of Cable

2 g

5 g

2240-002

2240-005

2240-010

2240-025

2240-050

2240-100

2240-200

4 ft

2240-CAB-04

14 ft 2240-CAB-14

33 ft 2240-CAB-33

50 ft 2240-CAB-50

! Responds to DC and AC Acceleration

! Non Standard g Ranges Available

! Low Noise

± 10 g

± 25 g

± 50 g

±100 g

±200 g

! Serialized for Traceability

DESCRIPTION

The model 2240 accelerometer is a hermetically sealed version of the model 2220. This rugged 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

titanium case is sealed using a laser welding process 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. A model 2240-CAB cable, sold separately (see order information above), connects via a

miniature 4-pin screw-on connector. The cable’s shield is electricallyconnected to the titanium casewhile the ground

(GND) wire is isolated from the case. An initial calibration sheet (2240-CAL) is included and periodic calibration

checking is available.

OPERATION

The Model 2240 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 +9 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

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] Feb 08

Model 2240 Analog Accelerometer Module

SIGNAL DESCRIPTIONS

Vs and GND (Power): Red and Black wires respectively for the

2240-CAB cable (ordered separately). Power (+9 to +32 Volts

DC) and ground.

1.00 [25.4]

0.825 [20.95]

0.24 [6.1]

1/4-28, 4-PIN

CONNECTOR

SILICON

DESIGNS

AOP and AON (Output): Green and White wires respectively for

the 2240-CAB cable (sold separately). 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

outputs can be used differentially. (See response plot below).

2240-XXX

S/N XXXX

1.00 [25.4]

0.50 [12.7]

0.22 [5.6]

0.44 [11.2]

0.127

[3.23] DIA

0.33 [8.4]

GND

AOP

Positive

Acceleration

AON

0.15 [3.8]

(ACTUAL SIZE)

INCH [mm]

= Location of Sense Element

PERFORMANCE - By Model: V_S=+9 to +32VDC, T_C=25EC

MODEL NUMBER

UNITS

2240-002 2240-005 2240-010 2240-025 2240-050 2240-100 2240-200

Input Range

Frequency Response (Nominal, 3 dB) ¹

0 - 400

2000

100

200

0 - 600 0 - 1000 0 - 1500 0 - 2000 0 - 2500 0 - 3000

Sensitivity, Differential

800

400

160

mV/g

µg/(root Hz)

100

200

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=+9 to +32VDC, T_C=25EC, Differential Mode.

PARAMETER

Cross Axis Sensitivity

MIN

TYP

MAX

UNITS

-002

4.0

1.5

Bias Calibration Error

% of span

-005 thru -200

Bias Temperature Shift

-002

100

200

100

(ppm of span)/EC

(T_C= -40 to +80EC)

-005 thru -200

Scale Factor Calibration Error

Scale Factor Temperature Shift

(T_C= -40 to +80EC)

-002 thru -010

-025 thru -200

-250

-150

+150

ppm/EC

-002 thru -050

-100

0.15

0.25

0.40

>65

0.5

1.0

1.5

Non-Linearity

(-90 to +90% of Full Scale)

% of span

3, 4

-200

Power Supply Rejection Ratio

Output Impedance

Ω

Output Common Mode Voltage

Operating Voltage

2.45

VDC

mA DC

grams

grams/meter

Operating Current (AOP & AON open)

Mass (not including cable)

Cable Mass

Note 3: 100g versions and above are tested from -65g to +65g.

Note 4: Tighter tolerances are available on special order.

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

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] Feb 08

Model 2240 Analog Accelerometer Module

CABLE SPECIFICATIONS & LENGTH CONSIDERATIONS

The cable consists of four 30 AWG (7x38) silver plated copper wires with PTFE insulation surrounded by a braided shield. The

black FEP shield jacket has a nominal outer diameter of 0.100”. Cable lengths of up to 50 feet (15 meters) can be added to the

model 2240's standard 4 foot cable without the need to test for output instability. For lengths longer than 50 feet, 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 2240 is capable of driving over 2000 feet (600 meters) of its cable type

but at some length between 50 and 2000 feet, each device will likely begin to exhibit oscillation.

CONVERTING THE 2240'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 2240 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

2240 while using a single ended type connection.

This circuit converts the 4 Volt differential output of the model 2240 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= R₄and 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 R₂and C₁are tied to ground; using some other fixed voltage for this reference will shift the output.

The value of the optional capacitors C₁and 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:

f₀

2π R₂C₁

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

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] Feb 08

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