Chapter 1 — Introduction
The Preamplifiers
Falcon™ Range of Microphone Products
Microphone Handbook
Brüel & Kjær
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When the program is started from Windows™, the calibration data in the \DATA
directory of the disk in the A drive is shown. If no data is found, the Open box
automatically appears. Select the Sensitivity file to access all data associated with
the microphone. Selecting a Result or Work file will only give you access to that
particular response.
The data can be copied to the hard disk using the Copy Microphone Data function
in the File menu. Individual data files are named with the microphone’s serial
number to prevent file name conflicts with data files from other microphones.
The data shown can also be printed out or copied to the clipboard for further
processing in spreadsheets and text editors.
When a Sensitivity file is selected, all frequency responses are obtained by adding
the relevant corrections and the low-frequency response to the actuator response.
Any additional information about Brüel&Kjær Microphone Viewer can be seen in
the README.TXT file. In addition, help in the form of hypertext is included
throughout to guide you.
1.4 The Preamplifiers
The
1
/
2
" Microphone Preamplifier Type 2669 has been developed for making preci-
sion acoustic measurements with Brüel&Kjær’s wide range of condenser micro-
phones. You can connect
1
/
2
" microphones directly and 1",
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4
" and
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8
" types using
adaptors.
The preamplifier, cable and its connectors all fulfil EMC requirements.
You can verify the condition of the microphone, preamplifier and cable in-situ using
Brüel&Kjær’s patented Charge-injection Calibration technique. This means that
you can detect defects in the entire measurement set-up, including the microphone.
The preamplifier’s low output impedance allows long extension cables to be used
without problems.
The robust, compact design means that you can use the
1
/
2
"Microphone Preamplifi-
er Type 2669 over a wide range of environmental conditions. The cable, which you
can detach from the preamplifier, is very thin but strong and remains flexible down
to –20°C.
The
1
/
2
" Microphone CCLD Preamplifier Type 2671 has been developed for use with
prepolarised microphones in mind.
Full details of the
1
/
2
" Microphone CCLD Preamplifier Type 2671 are available in
the 2671 Product Data Sheet.
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