BRUEL & KJAER 3028 User manual

Brüel&Kjær
BI5038–11e
Technical
Documentation
WORLD HEADQUARTERS: DK-2850 Nærum • Denmark •
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4-channel Microphone Module Type 3028
Service Manual

0−2Brüel & Kjær4-channel Microphone Module Type 3028
Service Manual
Proprietary: Authorized Brüel & Kjær Personnel Only

April 1997
BI5038–11e
Brüel & Kjær 4-channel Microphone Module Type 3028
Service Manual
4-channel Microphone Module
Type 3028
Service Manual
Valid from serial number 1 111 111

0−2Brüel & Kjær4-channel Microphone Module Type 3028
Service Manual
Safety Considerations
This apparatus has been designed and tested in accordance with IEC Publication
348, Safety Requirements for Electronic Measuring Apparatus, and has been supplied
in safe condition. This Guide contains information and warnings which must be fol-
lowed by the user to ensure safe operation and to retain the apparatus in safe
condition. Special note should be made of the following:
Safety Symbols
See the associated warning statements given in the User Guide.
Chassis Terminal
Safety Earth Terminal
Hazardous Voltage
Warnings
This is a CISPR II, Class A product. In a domestic environment this product may
cause radio interference in which case the user may be required to take adequate
measures
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.
Copyright © 1997, Brüel&Kjær Sound and Vibration Measurement A/S
All rights reserved. No part of this publication may be reproduced or distributed in
any form or by any means without prior consent in writing from Brüel & Kjær Sound
and Vibration Measurement A/S, Nærum, Denmark.

4-channel Microphone Module Type 3028
Service Manual
BI5038–11e 0−3
Contents
1. General Information.................................................................................................. 1–1
1.1 Introduction................................................................................................................. 1–2
1.2 Edition Number........................................................................................................... 1–2
1.3 Safety ........................................................................................................................... 1–3
1.4 Service Policy............................................................................................................... 1–3
1.5 Special Tools and Equipment..................................................................................... 1–3
1.6 Connections ................................................................................................................. 1–4
2. Service Note...................................................................................................................... 2–1
2.1 On-line Editions of the Service Manual..................................................................... 2–2
2.2 Printed Editions of the Service Manual..................................................................... 2–2
3. Checking Procedure................................................................................................... 3–1
3.1 Introduction................................................................................................................. 3–2
3.2 Checking Procedure .................................................................................................... 3–2

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Service Manual Brüel & Kjær
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4-channel Microphone Module Type 3028
Service Manual
BI5038–11e 1−1
Chapter 1
General Information

Chapter 1 — General Information
Introduction
4-channel Microphone Module Type 3028
Service Manual Brüel & Kjær
1−2
1.1 Introduction
Type 3028 is a 4-channel input module for use in Acquisition Front-end Type 2825
and Multichannel Data Acquisition Unit Type 2816.
Type 3028 supports Brüel & Kjær Falcon Range Preamplifiers and Charge Injection
Calibration (CIC). Each channel has a frequency range of 25 kHz. Type 3028 has
four Type 1B 7-pin LEMO sockets on its front panel for connection of Microphone
Preamplifier Type 2669 L or Type 2670.
1.2 Edition Number
If any major changes are made to the instrument and/or Service Manual, a new
edition of the Service Manual will be released. Any new edition can be recognised
by the Literature Number (BI5038-xx) given at the bottom of odd numbered pages.
Fig.1.1 Type 3028

Chapter 1 — General Information
Safety
4-channel Microphone Module Type 3028
Service Manual
BI5038–11e 1−3
The serial number from which each edition is valid is printed in the Frontispiece of
this Service Manual.
Information concerning minor changes will be released in the form of a Service
Note which is dealt with in section 2.1.
1.3 Safety
Type 3028 has been designed and tested in accordance with IEC Publication 348,
Safety Requirements for Electronic Measuring Apparatus, and has been supplied in
safe condition.
Any work done on the instrument when open must be done by a qualified person
who is aware of the hazards involved.
Note: The word WARNING denotes a hazard. It calls attention to a procedure,
practice, or like, which, if not correctly performed or adhered to, could result in
personal injury.
1.4 Service Policy
Type 3028 is a Field Replaceable Part (FRP). To assure economical reuse, it is
important that no attempt is made to repair it locally. If such an attempt is made,
the price of an exchange FRP is 100% the price of a new one.
Therefore, DO NOT ATTEMPT ANY REPAIR to Type 3028. Order the module as
an FRP using order number FR0163.
1.5 Special Tools and Equipment
Type 3028 must always be checked as part of a multichannel system incorporating
Acquisition Front-end Type 2825 or Multichannel Data Acquisition Unit Type 2816.
No other special equipment is needed.

Chapter 1 — General Information
Connections
4-channel Microphone Module Type 3028
Service Manual Brüel & Kjær
1−4
1.6 Connections
LEMO socket
Table 1.1 Connections on the Type 1B 7-pin LEMO socket
Charge Injection
Microdot connector, fitted with shorting plug JP0169 when not in use.
Connection Use
Pin 1 Charge Injection Output
Pin 2 Signal Ground
Pin 3 Polarization Voltage
Pin 4 Signal Input
Pin 5 Not connected
Pin 6 Power Supply Positive (+15V)
Pin 7 Power Supply Positive (–15V)
Casing Instrument Chassis

4-channel Microphone Module Type 3028
Service Manual
BI5038–11e 2−1
Chapter 2
Service Note

Chapter 2 — Service Note
On-line Editions of the Service Manual
4-channel Microphone Module Type 3028
Service Manual Brüel & Kjær
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2.1 On-line Editions of the Service Manual
From time to time some minor changes may be made to improve the performance
and serviceability of Type 3028. All information concerning these changes, or any
other changes to the service manual, are included in the latest version of the on-
line source document.
This Service Note section contains a history of the changes when any are made.
2.2 Printed Editions of the Service Manual
From time to time some minor changes may be made to improve the performance
and serviceability of Type 3028. All information concerning these changes, or any
other changes to the Service manual, will be released in the form of a Service Note.
Note: Printed Service Notes are renewed as a whole, meaning:
Discard the previous Service Note every time you receive a new one
The new edition of the Service Note must be placed in the binder in this section.
The organisation of the Service Note is as in the Service Manual, i.e. the Service
Note is divided into sections with names corresponding to the section name in the
Service Manual.

4-channel Microphone Module Type 3028
Service Manual
BI5038–11e 3−1
Chapter 3
Checking Procedure

Chapter 3 — Checking Procedure
Introduction
4-channel Microphone Module Type 3028
Service Manual Brüel & Kjær
3−2
3.1 Introduction
The checking procedure is performed on a fully assembled multichannel system
incorporating the Type 3028 module. The procedure enables you to verify that Type
3028 meets specifications. In the case of a fault appearing, the module must be
exchanged (see section 1.4).
3.2 Checking Procedure
Type 3028 is tested using the test program that is part of the PULSE system (refer
to Chapter 2 of the PULSE Installation Manual).