BRUEL & KJAER 4964 Guide

Technical
Documentation
Microphone Type 4964
for Hand-held Analyzer
Types 2250, 2250-L and 2270
Supplement to Instruction Manual BE1712
HEADQUARTERS: Brüel&Kjær Sound & Vibration Measurement A/S · DK-2850 Nærum · Denmark
Telephone: [phone] · Fax: [phone] · www.bksv.com · [e-mail]
Local representatives and service organisations worldwide
ËBE-1748---JÎ
English BE1864–11

BE186411 December 2013
Microphone Type 4964
for Hand-held Analyzer
Types 2250, 2250-L and 2270
Type 2250, from Hardware Version 1.1
Type 2250-L, from Hardware Version 2.0
Type 2270, from Hardware Version 3.0
Supplement to Instruction Manual BE 1712

Copyright 2006 – 2013, Brüel&Kjær Sound & 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 written consent from Brüel&Kjær Sound & Vibration Measurement A/S, Nærum, Denmark.
Safety Considerations
This apparatus has been designed and tested in accordance with IEC61010–1 and EN61010 – 1 Safety Require-
ments for Electrical Equipment for Measurement, Control and Laboratory Use. This manual contains infor-
mation 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

CHAPTER 1
Introduction.......................................................................................................................................... 1
1.1 About This Supplement............................................................................................................................. 1
1.2 System Overview....................................................................................................................................... 1
CHAPTER 2
Information Required by the Standards ............................................................................................ 3
2.1 Introduction................................................................................................................................................ 3
CHAPTER 3
Conformance Testing.......................................................................................................................... 5
3.1 Introduction................................................................................................................................................ 5
3.5 Electrical Substitute for Microphones........................................................................................................ 5
3.6 Testing 1/1-octave-band and 1/3-octave-band Filters............................................................................... 6
CHAPTER 4
Specifications ...................................................................................................................................... 7
4.1 Specifications ............................................................................................................................................ 7
4.5 Microphone................................................................................................................................................ 7
4.6 Frequency Responses............................................................................................................................... 7
4.8 Self-generated Noise................................................................................................................................. 8
4.9 Measuring Ranges .................................................................................................................................. 15
4.11 Spectrum Analysis................................................................................................................................... 21
4.12 Influence from the Operating Environment.............................................................................................. 23
APPENDIX E
G-weighting........................................................................................................................................ 25
E.1 Introduction.............................................................................................................................................. 25
E.2 Frequency Weighting............................................................................................................................... 25
E.3 G-weighted Self-generated Noise ........................................................................................................... 27
E.4 G-weighted Linear Operating Range....................................................................................................... 27
INDEX........................................................................................................................................................................... 29

1
Chapter 1
Introduction
1.1 About This Supplement
This document is a supplement, to Instruction Manual for Hand-held Analyzer Types 2250, 2250-L and
2270 BE 1712. It provides the information relevant when Hand-held Analyzer Type 2250, 2250-L or 2270
is configured with Low-frequency Free-field ½Condenser Microphone Type 4964.
The combination of Low-frequency Free-field ½Condenser Microphone Type 4964 and the hand-held
analyzer is intended for low frequencies. This combination makes it possible to measure down to 0.4 Hz
(–1 dB).
This document also contains the specifications for the frequency analyzer applications when
Low Frequency is set to Very Low and for G-weighting.
The numbering of chapters, sections, figures and tables in this supplement corresponds to
Instruction Manual BE 1712. This supplement only contains content that is different from the
instruction manual and is specific to this microphone configuration. The other chapters, sections,
figures and tables should be read in Instruction Manual BE 1712.
Also see section 1.1 of the Instruction Manual BE 1712.
1.2 System Overview
1.2.4 Hardware Setup
This section provides an overview of the additional hardware components used when the analyzers are
configured with one of two microphone configurations based on Microphone Type 4964. The other hardware
components can be found in Instruction Manual BE 1712, section 1.2.4.
The microphone configurations are:
• Type 4964 without Adaptor UC-0211 and with Low Frequency set to Normal or Extended
• Type 4964 with Adaptor UC-0211 and with Low Frequency set to Very Low
Table 1.1
Additional hardware
components needed
for conformance
testing of the
analyzersconfigured
with Type 4964
Quantity*Brüel & Kjær
Type/Part
Number Description
1 or 2 Type 4964 Low-frequency Free-field ½Condenser Microphone Type 4964
1 or 2 UC-0211 Low-frequency Adaptor
*. Quantity depends on which analyzer is to be tested.

Microphone Type 4964 – Supplement to Instruction Manual BE 17122

3
Chapter 2
Information Required by the Standards
2.1 Introduction
This chapter contains detailed information required by the standards to be described in the Instruction Manual.
No additional information is required in Chapter 2 when using Microphone Type 4964 together
with the analyzer.

Microphone Type 4964 – Supplement to Instruction Manual BE 17124

5
Chapter 3
Conformance Testing
3.1 Introduction
This chapter contains the information needed to conduct conformance testing according to the
specified standards.
3.5 Electrical Substitute for Microphones
3.1.1 Without Low-frequency Adaptor UC-0211
NOTE: Low-frequency Adaptor UC-0211 should not be mounted on the preamplifier.
To obtain a BNC-type electrical input, replace the microphone with a WA-0302-B, 15 pF, fitted with a
10–32 UNF to BNC adaptor, UA-0245.
This Electrical Substitute for Microphones has (together with the preamplifier) a nominal attenuation of
0.65 dB.
The electrical input obtained in this way has a maximum input level of at least ±15.24 VPeak and no
damage will occur for signals up to ±20 VPeak.
All electrical inputs can be short-circuited when needed for test.
To calibrate the analyzer for the electrical conformances test with a calibration that corresponds to the
calibration you would get if the analyzer were fitted with a microphone with the nominal Open Circuit
Sensitivity, do the following:
1) On the Setup display (Full tab):
•SetInput, Transd. Used to the microphone that you intend to substitute
•SetInput, Input to Top Socket
2) Calibrate the analyzer by typing in the nominal sensitivity as the Sensitivity on the Calibration
display. For Microphone Type 4964, the nominal sensitivity is the microphone’s Open Circuit
Sensitivity (50.00 mV/Pa), attenuated by the Microphone Preamplifier ZC-0032’s nominal
attenuation (0.25 dB), which equates to 48.58 mV/Pa. Do not press the Start Calibration button.
3) Connect an electrical sinusoidal signal with a frequency of 1 kHz to the Electrical Substitute for
Microphones and adjust the amplitude of this signal until LZF (or LCF) displays 94.00 dB in the
Calibration display. This electrical amplitude is the 94.00 dB reference for the electrical tests. The
amplitude will typically be 52.5 mV. This is due to the attenuation of the Electrical Substitute for
Microphones together with the preamplifier (nominally 0.65 dB).

Microphone Type 4964 – Supplement to Instruction Manual BE 17126
3.1.2 With Low-frequency Adaptor UC-0211
NOTE: Low-frequency Adaptor UC-0211 should be mounted on the preamplifier.
To obtain a BNC-type electrical input, replace the microphone with a WA-0302-B, 15 pF, fitted with a
10–32 UNF to BNC adaptor, UA-0245.
This Electrical Substitute for Microphones has (together with the preamplifier and Low-frequency
Adaptor UC-0211) a nominal attenuation of 17.78 dB.
The electrical input obtained in this way has a maximum input level without overload of typically
±0.67 VPeak and no damage will occur for signals up to ±50 VPeak.
All electrical inputs can be short-circuited when needed for test.
To calibrate the analyzer for the electrical conformances test with a calibration that corresponds to the
calibration you would get if the analyzer were fitted with a microphone with the nominal Open Circuit
Sensitivity, do the following:
1) On the Setup display (Full tab):
•SetInput, Transd. Used to the microphone that you intend to substitute
•SetInput, Input to Top Socket
2) Calibrate the analyzer by typing in the nominal sensitivity as the Sensitivity on the Calibration
display. For Microphone Type 4964, the nominal sensitivity is the microphone’s Open Circuit
Sensitivity (50.00 mV/Pa), attenuated by the Microphone Preamplifier ZC-0032’s nominal
attenuation with UA-0211 mounted (18.25 dB), which equates to 6.12 mV/Pa. Do not press the Start
Calibration button.
3) Connect an electrical sinusoidal signal with a frequency of 1 kHz to the Electrical Substitute for
Microphones and adjust the amplitude of this signal until LZF (or LCF) displays 94.00 dB in the
Calibration display. This electrical amplitude is the 94.00 dB reference for the electrical tests. The
amplitude will typically be 5.81 mV. This is due to the attenuation of the Electrical Substitute for
Microphones together with the preamplifier and UC-0211 (nominally 17.78 dB).
3.6 Testing 1/1-octave-band and 1/3-octave-band Filters
For tests where Low Frequency is set to Normal or Extended follow the procedure in the Instruction
Manual BE 1712 Section 3.6.
For tests where Low Frequency is set to Very Low use the following procedure:
NOTE: These measurements require Frequency Analysis Software and Low Frequency Option to be
enabled.
Low-frequency Adaptor UC-0211 must be mounted on preamplifier ZC-0032 and electrical input must be
introduced trough the Electrical Substitute for Microphones WA-0302-B mounted on UC-0211.
All tests according to IEC 61260 must be conducted with Setup screen:
•Transd. Used parameter set to 4964+UC-0211 and Low Frequency set to Very Low
•Frequency Settings parameter Spectrum set to Z

7
Chapter 4
Specifications
4.1 Specifications
Specifications are given for the configuration detailed in Chapter 1.
Unless specifically noted, specifications are given as typical data under Reference Environmental
Conditions, and with the system calibrated to the nominal microphone open circuit sensitivity.
NOTE: The specifications given here for the Z-weighting, as defined in IEC 61672–1, are also valid for
the Lin response, as defined in IEC 60651.
4.5 Microphone
Microphone Type 4964 and Microphone Preamplifier ZC-0032:
Type: Prepolarized Low-frequency Free-field ½Condenser Microphone
Nominal Open Circuit Sensitivity: 50 mV/Pa, (corresponding to –26 dB re 1 V/Pa) ± 1.5 dB
Capacitance: 14 pF (at 250 Hz)
Nominal Preamplifier Attenuation: 0.25 dB without UC-0211, 18.25 dB with UC-0211
Extension Cables between Microphone Preamplifier ZC-0032 and the analyzer: Up to 100 m without
degradation of the specifications. NOTE: EMC is only tested with a 10 m cable (AO-0441-D-100)
Microphone Reference Point: The centre of the front surface of the microphone protection grid
Reference Direction of Sound Incidence: See the small drawings in the lower right corner of the
directional response graphs in section 4.7 Directional Responses
4.6 Frequency Responses
4.6.2 Typical Low-frequency Responses
The typical Low-frequency Responses for Z frequency weighting are given in Fig.4.2a and Fig.4.2b. The
Electrical Responses are for the rear ‘Input’ socket. The Acoustical Responses include Microphone
Type 4964 and Microphone Preamplifier ZC-0032.
Low-frequency Responses depend on the state of the Low Frequency parameter on the Setup display,
under Frequency Settings.
Low-frequency Responses are not influenced by the windscreen.
Low-frequency Responses are influenced by frequency response compensation.

Microphone Type 4964 – Supplement to Instruction Manual BE 17128
The Low-frequency Responses for introduction of the electrical signal through the recommended means to
substitute the microphone with an electrical input facility (section 3.5 Electrical Substitute for Microphones)
differs from the electrical responses in Fig.4.2a because it also includes Microphone Preamplifier ZC-0032.
Fig.4.2a Typical low-frequency responses without UC-0211
Fig.4.2b Typical low-frequency responses with UC-0211
4.8 Self-generated Noise
Self-generated noise is given for nominal microphone Open Circuit Sensitivity. Sound Field Correction
set to Free-field and no microphone accessories selected.
Electrical Response, Low Frequency set to Extended
Electrical Response, Low Frequency set to Normal
Acoustical Response With Type 4964, Low Frequency set to Extended
Acoustical Response With Type 4964, Low Frequency set to Normal 130463
-4
-2
0
2
4
dB
0.1 1 10 100 Hz
Electrical Response, Low Frequency set to Very Low
Acoustical Response With Type 4964, Low Frequency set to Very Low 130464
–4
–2
0
2
4
dB
0.1 1 10 100 Hz

CHAPTER 4
Specifications 9
4.8.1 Maximum Broadband Self-generated Noise
Table 4.1a
Maximum broadband
self-generated noise
without UC-0211
Maximum
Noise
Frequency Weighting
A-weighting
(dB) B-weighting (dB) C-weighting (dB) Z-weighting*
Normal (dB)
*. minimum 120 seconds LZeq
Z-weighting*
Extended (dB)
Single-range
Microphone 15.6 14.4 14.4 16.2 16.2
Electrical 13.6 12.9 14.4 19.6 28.1
Total 17.7 16.7 17.4 21.2 28.4
High Range
Microphone 15.6 14.4 14.4 16.2 16.2
Electrical 31.8 30.4 30.4 34.7 35.3
Total 31.9 30.5 30.5 34.8 35.4
Low Range
Microphone 15.6 14.4 14.4 16.2 16.2
Electrical 13.6 12.9 14.4 19.6 28.1
Total 17.7 16.7 17.4 21.2 28.4
Table 4.1b
Maximum broadband
self-generated noise
with UC-0211 Maximum Noise
Frequency Weighting
A-weighting
(dB) B-weighting (dB) C-weighting (dB) Z-weighting*
Very Low (dB)
*. minimum 120 seconds LZeq
Single-range
Microphone 15.6 14.4 14.5 16.2
Electrical 30.8 29.5 29.6 36.8
Total 30.9 29.6 29.7 36.8
High Range
Microphone 15.6 14.4 14.5 16.2
Electrical 49.8 48.4 48.4 52.6
Total 49.8 48.4 48.4 52.6
Low Range
Microphone 15.6 14.4 14.5 16.2
Electrical 30.8 29.5 29.6 36.8
Total 30.9 29.6 29.7 36.8

Microphone Type 4964 – Supplement to Instruction Manual BE 171210
4.8.2 Typical Broadband Self-generated Noise
Table 4.2a
Typical broadband
self-generated noise
without UC-0211 Typical Noise
Frequency Weighting
A-weighting
(dB) B-weighting (dB) C-weighting (dB) Z-weighting*
Normal (dB)
*. minimum 120 seconds LZeq
Z-weighting*
Extended (dB)
Single-range
Microphone 14.6 13.4 13.4 15.2 15.2
Electrical 12.4 11.6 13.0 18.4 27.0
Total 16.6 15.6 16.2 20.1 27.3
High Range
Microphone 14.6 13.4 13.4 15.2 15.2
Electrical 28.3 26.9 27.0 31.2 32.5
Total 28.5 27.1 27.2 31.3 32.6
Low Range
Microphone 14.6 13.4 13.4 15.2 15.2
Electrical 12.4 11.6 13.0 18.4 27.0
Total 16.6 15.6 16.2 20.1 27.3
Table 4.2b
Typical broadband
self-generated noise
with UC-0211 Typical Noise
Frequency Weighting
A-weighting
(dB) B-weighting (dB) C-weighting (dB) Z-weighting*
Very Low (dB)
*. minimum 120 seconds LZeq
Single-range
Microphone 14.6 13.4 13.5 15.2
Electrical 29.9 28.5 28.6 34.7
Total 30.0 28.6 28.7 34.7
High Range
Microphone 14.6 13.4 13.5 15.2
Electrical 46.3 44.9 44.9 49.2
Total 46.3 44.9 44.9 49.2
Low Range
Microphone 14.6 13.4 13.5 15.2
Electrical 29.9 28.5 28.6 34.7
Total 30.0 28.6 28.7 34.7

CHAPTER 4
Specifications 11
4.8.3 Typical Self-generated Noise Spectra
Typical spectra for self-generated noise are shown in Fig.4.24a to Fig.4.29b.
Fig.4.24a Typical self-generated noise, 1/1-octave band, Single-range, without UC-0211
Fig.4.24b Typical self-generated noise, 1/1-octave band, Single-range, with UC-0211
–
20 dB
–
15 dB
–
10 dB
–5 dB
0 dB
5 dB
10 dB
15 dB
8 16 31.5 63 125 250 500 1 k 2 k 4 k 8 k 16 k
Microphone Electrical Total
130466
Microphone Electrical Total
841 2 16 31.5 63 125 250 500 1 k 2 k 4 k 8 k 16 k
30 dB
–10 dB
–5 dB
0 dB
5 dB
10 dB
15 dB
20 dB
25 dB
130467

Microphone Type 4964 – Supplement to Instruction Manual BE 171212
Fig.4.25a Typical self-generated noise, 1/1-octave band, High Range, without UC-0211
Fig.4.25b Typical self-generated noise, 1/1-octave band, High Range, with UC-0211
Fig.4.26a Typical self-generated noise, 1/1-octave band, Low Range, without UC-0211
Microphone Electrical Total
130468
–20 dB
–15 dB
–10 dB
–5 dB
0 dB
5 dB
10 dB
15 dB
20 dB
25 dB
30 dB
8 16 31.5 63 125 250 500 1 k 2 k 4 k 8 k 16 k
130469
–10 dB
–5 dB
0 dB
5 dB
10 dB
15 dB
20 dB
25 dB
30 dB
35 dB
40 dB
45 dB
50 dB
8 16 31.5 63 125 250 500 1 k 2 k 4 k 8 k12 4 16 k
Microphone Electrical Total
Microphone Electrical Total
130470
–20 dB
–15 dB
–10 dB
–5 dB
0 dB
5 dB
10 dB
15 dB
8 16 31.5 63 125 250 500 1 k 2 k 4 k 8 k 16 k

CHAPTER 4
Specifications 13
Fig.4.26b Typical self-generated noise, 1/1-octave band, Low Range, with UC-0211
Fig.4.27a Typical self-generated noise, 1/3-octave band, Single-range, without UC-0211
Fig.4.27b Typical self-generated noise, 1/3-octave band, Single-range, with UC-0211
Microphone Electrical Total
130471
–10 dB
–5 dB
0 dB
5 dB
10 dB
15 dB
20 dB
25 dB
30 dB
8421 16 31.5 63 125 250 500 1 k 2 k 4 k 8 k 16 k
6.3
8
10
12.5
16 20 25
31.5
40 50 63 80
100 125 160 200 250 315 400 500 630 800
1 k
1.25 k
1.6 k
2 k
2.5 k
3.15 k
4 k 5 k
6.3 k
8 k
10 k
12.5 k
16 k 20 k
Microphone Electrical Total
130472
–20 dB
–15 dB
–10 dB
–5 dB
0 dB
5 dB
10 dB
15 dB
6.3
8
10
12.5
16
20
25
31.5
40
50
0.8
1
1.25
1.6
2
2.5
3.15
4
5
63
80
100
125
160
200
250
315
400
500
630
800
1 k
1.25 k
1.6 k
2 k
2.5 k
3.15 k
4 k 5 k
6.3 k
8 k
10 k
12.5 k
16 k
20 k
Microphone Electrical Total
130473
–10 dB
–5 dB
0 dB
5 dB
10 dB
15 dB
20 dB
25 dB
30 dB

Microphone Type 4964 – Supplement to Instruction Manual BE 171214
Fig.4.28a Typical self-generated noise, 1/3-octave band, High Range, without UC-0211
Fig.4.28b Typical self-generated noise, 1/3-octave band, High Range, with UC-0211
6.3
8
10
12.5
16 20 25
31.5
40 50 63 80
100 125 160 200 250 315 400 500 630 800
1 k
1.25 k
1.6 k
2 k
2.5 k
3.15 k
4 k 5 k
6.3 k
8 k
10 k
12.5 k
16 k 20 k
Microphone Electrical Total
130474
–20 dB
–15 dB
–10 dB
–5 dB
0 dB
5 dB
10 dB
15 dB
20 dB
25 dB
30 dB
6.3
8
10
12.5
16
20
25
31.5
40
50
0.8
1
1.25
1.6
2
2.5
3.15
4
5
63
80
100
125
160
200
250
315
400
500
630
800
1 k
1.25 k
1.6 k
2 k
2.5 k
3.15 k
4 k 5 k
6.3 k
8 k
10 k
12.5 k
16 k
20 k
Microphone Electrical Total
130475
–10 dB
–5 dB
0 dB
5 dB
10 dB
15 dB
20 dB
25 dB
30 dB
35 dB
40 dB
45 dB
50 dB