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Instruction Manual
Calibration Exciter Type 4294
4294
The Calibration Exciter Type
4294
pletely self-contained, pocket-sized,
tion reference source. It produces a refer
ence acceleration level of 10 ms-2
(w
frequency of
Hz
1000 rads-1) and
159,2
=
is intended for rapid calibration of vibration
measurement,
monitoring
and
systems utilising
piezoelectric transducers
and other vibration transducers.
+
Bri.iel & Kjcer
is a com
vibra
at a
RMS
recording
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Summary of Contents for BRUEL & KJAER 4294
- Page 1 4294 Instruction Manual Calibration Exciter Type 4294 The Calibration Exciter Type 4294 is a com pletely self-contained, pocket-sized, vibra tion reference source. It produces a refer ence acceleration level of 10 ms-2 at a frequency of 1000 rads-1) and 159,2...
- Page 2 CALIBRATION EXCITER TYPE 4294 From serial no. 1028400 Revision April 1985...
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Page 3: Table Of Contents
CONTENTS INTRODUCTION AND SPECIFICATIONS (PRODUCT DATA) .............. -
Page 4: Introduction And Specifications (Product Data)
4294 Calibration Exciter USES: FEATURES: Quick, easy field calibration of vibration measure Convenient, hand-held vibration reference • • ment and recording systems Integral accelerometer for servo-stabilisation of • System fault finding and continuity checking • vibration amplitude Reference vibration level of 1 0 ms- 2 •... -
Page 6: Operation
For powering the 4294 the use of a long life alkaline battery QB 0016 (IEC type 6LF22) is recommended. The battery fits into the battery holder which is accessible after unscrew ing the base of the Type 4294 (see Fig. 2. 2). To prevent damage take care not to cross the screw thread on reassembly. -
Page 7: 2.3. Mounting Of Transducer
Following this useage, the operating period will rapidly de crease indicating that the battery needs to be replaced. However, the 4294 may be used right up to the moment its battery is fully depleted without it influencing the accuracy of the reference level generated. -
Page 8: Basic System Calibration
Alternatively, a Mounting Magnet UA 0642 or Beeswax Y 0216 may be employed to attach transducers to the Mounting Disc. During calibration the transducer should be at approximately the same temperature as the Type 4294 for optimum accuracy. BASIC SYSTEM CALIBRATION 2.4. -
Page 9: Transducer Sensitivity Check
2 ; is the reference acceleration level. For the 4294 this is 10 ms- 2 . - Page 10 For the 4294 this is 10 ms- 2 If a calibrated voltmeter together with a conditioning amplifier is employed to mea...
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Page 11: Service And Repair
SERVICE AND REPAIR The 4294 is designed and constructed to provide the user with many years of reliable operation. However, should a fault occur which impairs its correct function then its internal battery should be removed to prevent the risk of further damage. For repair... - Page 12 Checking Procedure Activate the Exciter and note the meter reading. Mount an Accelerometer on the Type 4294. (Max load 70 g) Con nect the Accelerometer to a Preamplifier (Type 2639) through an Check that the noted reading corresponds to the voltage noted in adaptor JJ 2617.
- Page 13 RF 5100 Tantalum 4,7 ILF/35 V CF 0051 499 kf! RF 5499 Ceramic 10 nF/30 V CK 4101 29,4 kf! RF 4294 10,0 kf! RF 4100 49,9 kf! RF 4499 lin. Cermet 100 Kf! PG 4105 1,21 kf! RF 3121...
- Page 15 � · � � · Preamplifier Rectifier Integrator Output Amplifier t,OMn I,Ok!l R 41 IOOkO a,zMn BC 546 Z,ZnF 8,2MO 150110 Int. Accelerometer 10,0110 3,01k0 100ktl. 1,21110 . .. R ZO R 48 10,00 I,Oidl R 4 2 ZE 0438 1028400-830812-ZE 0438-4294...
- Page 16 4294 MARa• LOCATfOiif ..__o- FREQ, LEVEL dB 72.0 73.3 ?4. 2 ?�. 3 77.4 90.5 107.5 86.8 79.0 ?7.2 s ; · 11-11 1550 +* ��· �:. .:.: : · ·�� �··: .-. . · :.:·:: ' 1�...