BRUEL & KJAER 4294 Manual de usuario

Technical

Documentation

HEADQUARTERS: Brüel&Kjær Sound & Vibration Measurement A/S · DK-2850 Nærum · Denmark

Telephone: +45 7741 2000 · Fax: +45 4580 1405 · www.bksv.com · info@bksv.com

Local representatives and service organisations worldwide

Calibration Exciter

Types 4294 and 4294-002

English BE0739–15

User Manual

ËBE-0739---GÎ

BE0739–15 April 2014

Calibration Exciter

Types 4294 and 4294-002

User Manual

From serial no. 2863100

by any means, without prior written consent from Brüel&Kjær Sound & Vibration Measurement

A/S, Nærum, Denmark

Safety Considerations

This apparatus has been designed and tested in accordance with IEC 61010–1 and EN61010– 1

Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory

Use. This manual contains information and warnings which must be followed to ensure safe

operation and to retain the apparatus in safe condition. Special note should be made of the

following:

Safety Symbols

The apparatus will be marked with this symbol when it is important that you refer to the

associated warning statements given in the manual.

Protective Earth Terminal Hazardous Voltage

Explosion Hazard

The equipment is not designed to be used in potentially explosive environments. It should not be

operated in the presence of flammable liquids or gases.

Warnings

• Switch off all power to equipment before connecting or disconnecting their digital interface.

Failure to do so could damage the equipment.

• Whenever it is likely that the correct function or operating safety of the apparatus has been

impaired, it must be made inoperative and be secured against unintended operation.

• Any adjustment, maintenance and repair of the open apparatus under voltage must be

avoided as far as possible and, if unavoidable, must be carried out only by trained service

personnel.

• Do not dispose of electronic equipment or batteries as unsorted municipal waste

• It is your responsibility to contribute to a clean and healthy environment by using

the appropriate local return and collection systems

• Hazardous substances in electronic equipment or batteries may have detrimental

effects on the environment and human health

• The symbol shown to the left indicates that separate collection systems must be used

for any discarded equipment or batteries marked with that symbol

• Waste electrical and electronic equipment or batteries may be returned to your

local Brüel&Kjær representative or to Brüel & Kjær Headquarters for disposal

Contents

CHAPTER 1

Introduction......................................................................................................... 1

CHAPTER 2

Operation............................................................................................................. 3

2.1 Environment and Handling................................................................................... 3

2.2 Battery Installation and Replacement.................................................................. 3

2.3 Mounting a Transducer........................................................................................ 4

2.4 Basic System Calibration..................................................................................... 5

2.5 Transducer Sensitivity Check .............................................................................. 6

CHAPTER 3

Specifications..................................................................................................... 9

3.1 Compliance with Standards................................................................................. 9

3.2 Specifications..................................................................................................... 10

3.3 Dimensions........................................................................................................ 11

CHAPTER 4

Service and Repair........................................................................................... 13

Chapter 1

Introduction

USES

• Precise field calibration of vibration transducers

• Rapid calibration and checking of vibration transducer sensitivity

• Quick, easy field calibration of vibration measurement and recording systems

FEATURES

• Small, lightweight, and battery-driven

• Leather case for impact protection

• Designed for everyday use in harsh environments

• Acceleration, velocity and displacement calibration

• High-precision, crystal-controlled servo operating at 159.15 Hz (1000 rad s–1)

• Drop- and environment-tested according to IEC 60068

• Splash-proof according to IP 54 (IEC 60529)

Description

Type 4294 enables accurate adjustment of measuring instrumentation at a standard acceleration

level of 10 ms–2 (0 – 70 gram load). The reference signal can also be used for velocity and

displacement calibration at 10 mms–1 and 10 µm, respectively.

Type 4294-002 enables accurate adjustment of measuring instrumentation at a standard

acceleration level of 3.16 ms–2 (0 – 200 gram load). The reference signal can also be used for

velocity and displacement calibration at 3.16 mms–1 and 3.16 µm, respectively.

The calibrator contains an electromagnetic exciter driven by a crystal oscillator at a frequency

of 159.15 Hz (1000 rad s–1). A small accelerometer on the underside of the vibration table

provides servo feedback to maintain a constant, accurate vibration level independent of the

mass of the transducer under test (maximum 70 gram for Type 4294 and 200 gram for

Type 4294-002).

Calibration Exciter Types 4294 and 4294-002 – User Manual2

Fig.1.1

Calibration Exciter

Type 4294 in its leather

case

To prevent overload, power to the calibrator is automatically disconnected if a transducer mass

above 70 gram for Type 4294 or 200 gram for Type 4294-002 is mounted on the exciter’s

vibration table.

Use of the calibrator is straightforward. You can attach a transducer to the vibration table using

(see Fig.2.2):

• 10 – 32 UNF Steel Stud YQ-2962

• 10 g Mounting Disc DB-2996 (supplied) for transducers:

– with 3 mm threads

– fitted with Mounting Magnet UA-0642

– mounted with beeswax

Note:

Mounting using adhesive is not recommended.

To switch the calibrator on, press the small button on the side of its housing.

After system adjustment, turn the calibrator off by pressing the button again.

To prolong the battery life, the exciter automatically switches off after approximately

100 seconds.

Chapter 2

Operation

2.1 Environment and Handling

Calibration Exciter Type 4294 is designed for use in environments at temperatures within the

range –10 to +55°C (+14 to +131°F) and with relative humidity up to 90% RH (30°C (86°F),

non-condensing). Whenever possible, the exciter should be used in its leather case (see

Fig.1.1) to protect it from mechanical damage and contamination from grease or dirt.

2.2 Battery Installation and Replacement

For powering Type 4294, a long-life alkaline battery QB-0016 (IEC Type 6LR61) is

recommended. The battery fits into the battery holder, which is accessible after unscrewing the

base of the calibrator (see Fig.2.1). To prevent damage, take care not to cross the screw thread

on reassembly.

To maximise battery life, Type 4294 automatically switches off after approximately 100 s.

Using Battery QB-0016, approximately 200 calibrations, each of approximately 100 s, are

possible. After this, the operating period rapidly decreases, indicating that the battery needs to

be replaced. However, the exciter can be used until its battery is fully depleted without

influencing the accuracy of the reference level generated.

Fig.2.1 9 V battery installed in the calibrator

Calibration Exciter Types 4294 and 4294-002 – User Manual4

2.3 Mounting a Transducer

Types 4294 and 4294-002 are designed for use with Brüel & Kjær Accelerometers with

maximum weights of 70 and 200 grams, respectively. The accelerometers can be mounted with

“finger-tight” mounting torque (~0.3 Nm, max. 0.5 Nm) directly onto the vibration table using

a 10–32 UNF steel stud YQ-2962, or mounted with the aid of Mounting Disc DB-2996 for

transducers weighing less than 10 grams. Different mounting options are illustrated in Fig.2.2.

Caution:

If the specified torque is exceeded, be sure to apply a similar counter-torque to the armature in

order to protect the vibration table from damage

The mounting disc lets you attach accelerometers in several ways. Small transducers fitted with

3 mm threads can be attached using 3 mm Steel Stud YQ-2007. Alternatively, a Mounting

Magnet UA-0642 or Beeswax YJ-0216 can be used to attach transducers to the mounting disc.

Fig.2.2 Transducer mounting options

4294 or 4294-002

Calibration Exciter

Accelerometer

with Integral

10-32 UNF Stud

10-32 UNF

Threaded

Accelerometer

10-32 UNF

Threaded

Accelerometer

M3 Threaded

Accelerometer

with Integral

M3 Stud

Accelerometer

without

Base Thread

¼-28 UNF

Threaded

Accelerometer

10-32 UNF

Mounting Thread

YQ-2962

10-32 UNF Stud

UA-0642

Mounting

Magnet

YQ-2007

M3 Stud

YJ-0216

Beeswax

UA-2062

¼-28 UNF to

10-32 UNF Stud

DB-2996 Mounting Disc

(3 mm tapping, 10-32 UNF thread)

140090

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