Measurement Computing 4623 Manual de usuario

Operating Manual

Measurement Specialties, Inc. www.meas-spec.com +1 949-716-5377

32 Journey, Suite 150, Aliso Viejo, CA 92656 USA 1 of 8 t&m@meas-spec.com

TMTM

Model 4623 Accelerometer

Measurement Specialties, Inc.

Vibration Sensors Design Center

32 Journey, Suite 150

Aliso Viejo, CA 92656 USA

Tel: 949-716-7324

www.meas-spec.com

vibration@meas-spec.com

Operating Manual

Measurement Specialties, Inc. www.meas-spec.com +1 949-716-5377

32 Journey, Suite 150, Aliso Viejo, CA 92656 USA 2 of 8 t&m@meas-spec.com

TMTM

Warranty

Measurement Specialties, Inc. accelerometers

are warranted during a period of one year from

date of shipment to original purchaser to be free

from defects in material and workmanship. The

liability of Seller under this warranty is limited to

replacing or repairing any instrument or

component thereof which is returned by Buyer,

at his expense, during such period and which

has not been subjected to misuse, neglect,

improper installation, repair, alteration, or

accident. Seller shall have the right to final

determination as to the existence and cause of a

defect. In no event shall Seller be liable for

collateral or consequential damages. This

warrant is in lieu of any other warranty,

expressed, implied, or statutory; and no

agreement extending or modifying it will be

binding upon Seller unless in writing and signed

by a duly authorized officer.

Receiving Inspection

Every Measurement Specialties, Inc.

accelerometer is carefully inspected and is in

perfect working condition at the time of

shipment. Each accelerometer should be

checked as soon as it is received. If the unit is

damaged in any way, or fails to operate, a claim

should immediately be filed with the

transportation company.

Service Concerns

If a Measurement Specialties, Inc. instrument

requires service, first contact the nearest

Measurement Specialties, Inc. representative.

They may be able to solve the problem without

returning the unit to the factory. If it is

determined that factory service is required, call

Customer Service at the regional headquarters

for an RMA number before return.

Returns

All units being returned to the factory require an

RMA (Return Material Authorization) number

before they will be accepted. This number may

be obtained by calling Customer Service at the

regional headquarters with the following

information; model number(s), quantity, serial

number(s), and symptoms of the problem, if

being returned for service. You must include the

original purchase order number if under

warranty.

Recalibration Services

The Vibration Sensors Design Center and its

two manufacturing facilities in China and France

offer factory re-calibration services for

Piezoresistive, Piezoelectric and Integrated

Electronics Piezoelectric (IEPE, ISOTRON, ICP,

etc.) accelerometers. NIST (US), DKD

(Germany), COFRAC (France) traceable

calibration services on sensitivity at 100 Hz (102

or 120 Hz in Europe) and full frequency sweeps

are offered. Contact the regional headquarters

for pricing information.

Inquiries

Address all inquiries on operation or applications

to your nearest Sales Representative, or to the

Vibration Applications Support as follows:

Global Headquarters

1000 Lucas Way

Hampton, VA 23666, USA

Tel: +1 757 766 1500

Vibration Sensors Design Center

32 Journey, Suite 150

Aliso Viejo, CA 92656, USA

Tel: +1 949 716 7324

European Headquarters

Impasse Jeanne BENOZZI

CS 83 163, 31027 Toulouse Cedex 3, France

Tel: +33 (0) 582 08 22 00

Asian Headquarters

Measurement Specialties (China), Ltd.

No. 26 Langshan Road

Shenzhen High-Tech Park (North)

Nanshan District, Shenzhen 518057, China

Tel: +86 755 3330 5088

Operating Manual

Measurement Specialties, Inc. www.meas-spec.com +1 949-716-5377

32 Journey, Suite 150, Aliso Viejo, CA 92656 USA 3 of 8 t&m@meas-spec.com

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Description

The Model 4623 is a signal conditioned and temperature compensated MEMS accelerometer offering

high sensitivity in ranges from ±2g to ±100g. The DC response accelerometer offers outstanding

performance over a wide operating temperature range and incorporates an EMI/EMC protection circuitry

for harsh installations. The output is filtered and signal conditioned to provide a low noise amplified signal

with exceptional resolution. The Model 4623 accelerometer incorporates a rugged strain relief for

demanding applications and is packaged in an anodized aluminum housing.

Installation

The model 4623 accelerometer is designed to be screw mounted but can also be adhesively mounted if

the installation does not allow for screw mounting.

Screw Mounting

For screw mounting of accelerometers the following guidelines should be followed:

The mounting surface should be clean and free of any residue or foreign material.

The mounting surface should be smooth, flat, and with a maximum surface roughness of 32 micro-

inches rms.

Optional: Apply a light coating of coupling fluid (machine oil or silicone grease) on the mating surface

to maximize the usable frequency range.

Torque screws to recommended limits using steel washers under the heads of the mounting screws.

Use manual torque wrench (do not use electric tools).

Mounting screws

Torque to 3 lb-in (0.3 Nm)

Operating Manual

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Adhesive Mounting

To avoid damaging the accelerometer during subsequent removal, it is recommended to use an

adhesive mounting adaptor for this method of attachment. For adhesively mounting of accelerometers

the following guidelines should be followed:

The mounting surface should be clean and free of any residue or foreign material.

The mounting surface should be smooth, flat, and with a maximum surface roughness of 64 micro-

inches rms.

For best high frequency performance a cyanoacrylate adhesive is recommend. A thin layer offers

best frequency response.

Soften adhesive cured adhesive with a chemical debonder (eg. acetone) prior to removal. Gently

shear accelerometer loose from the mounting surface after waiting a few minutes for the debonding

agent to penetrate the epoxy. Make sure not to use excessive force as this may damage the

accelerometer.

Biaxial Mounting Configurations

The model 4623 accelerometer has a unique housing that enables it to be mounted in two different

orientations to measure either the normal or transverse acceleration input. By simply rotating the housing

90 degrees, the accelerometer can now be used to measure transverse motion. The two mounting

orientations are illustrated below.

Operating Manual

Measurement Specialties, Inc. www.meas-spec.com +1 949-716-5377

32 Journey, Suite 150, Aliso Viejo, CA 92656 USA 5 of 8 t&m@meas-spec.com

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Wiring

The accelerometer is designed to be operated from 7-30Vdc excitation and provide a ±2V full scale

output with a 2.5V reference voltage. The output is DC-coupled and can be used in either single-ended

or differential mode. Differential mode offers the best performance since common mode errors are

minimized. The electrical hookup for both modes of operation is detailed below.

Single-Ended Operation

For single-ended operation a 2.5Vdc bias will be present on the output leads and the output of the

accelerometer will be 0.5-4.5V full scale. For single-ended operation the accelerometer should be

connected to the signal conditioner as detailed below. To avoid permanently damaging the

accelerometer, the white wire should not be connected to ground.

SINGLE ENDED OUTPUT

Differential Operation

For differential operation the output of the accelerometer will be ±2V full scale without a bias voltage

present. For differential operation the accelerometer should be connected to the signal conditioner as

detailed below. Common mode voltage is 2.5V.

DIFFERENTIAL OUTPUT

Operating Manual

Measurement Specialties, Inc. www.meas-spec.com +1 949-716-5377

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Cable Routing

The model 4623 accelerometer incorporates a FEP jacketed cable with an integral shield. The cable

assembly should be properly secured at regular intervals during testing. It is recommended to use

clamps, wax, or tape to secure the cable to minimize cable motion that can add noise to the output

signal. The initial attachment should be within two to three inches of the accelerometer with some slack

in the cable to prevent tension at the connector joint

Avoid routing cables near high-voltage wires and also ground the shield at the signal conditioner to

minimize ground loops.

Operating Manual

Measurement Specialties, Inc. www.meas-spec.com +1 949-716-5377

32 Journey, Suite 150, Aliso Viejo, CA 92656 USA 7 of 8 t&m@meas-spec.com

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Noise Floor Specifications

The model 4623 accelerometer incorporates a LP filtered output for a high output signal. The noise

specifications for this accelerometer are detailed in table below.

FULL SCALE

RATING

(g-pk)

SENSITIVITY

(mV/g)

±5% AMPL

PASSBAND

(Hz)

PASSBAND

NOISE

(µVrms)

SPECTRAL

NOISE

(µg-rms/√Hz)

DYNAMIC

RANGE

(dB)

1000

150

500

400

150

500

200

450

400

550

219

600

450

316

100

1000

450

516

Operating Manual

Measurement Specialties, Inc. www.meas-spec.com +1 949-716-5377

32 Journey, Suite 150, Aliso Viejo, CA 92656 USA 8 of 8 t&m@meas-spec.com

TMTM

Frequency Response & Phase Deviation Curves

The typical frequency response and phase deviation curves for the model 4623 accelerometer are

illustrated below.

Typical Phase Response

-40

-35

-30

-25

-20

-15

-10

-5

10 100 1000 10000

Frequency (Hz)

Phase (degrees)

2g Range

10g Range

30g Range

50g Range

100g Range

200g Range

Typical Frequency Response

-40

-35

-30

-25

-20

-15

-10

-5

110 100 1000 10000

Frequency (Hz)

Sensitivity Deviation (%)

2g Range

5g Range

10g Range

25g Range

50g Range

100g-500g Range

Tabla de contenidos

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