Chapter 8 —
1
/
2
" Microphone Preamplifier Type 2669
Dynamic Range
Falcon™ Range of Microphone Products
Microphone Handbook
Brüel & Kjær
8
−
6
Distortion:
Distortion (THD)
: <–80dB (1000Hz, 25V output, 3m cable)
Maximum Output:
The maximum output of the preamplifier depends on the capacitive load (for exam-
ple, extension cables) connected to the output. If the specified maximum output
current of the preamplifier is exceeded, the signal will be distorted.
Fig.8.5 and Fig.8.6 show the distortion-limited output when the preamplifier is
used with different power supplies.
Fig.8.5 Upper limit of dynamic range (3% distortion) of pream-
plifier (powered by traditional Brüel&Kjær power sup-
plies) due to capacitive loading as a function of
frequency. Note: These power supplies limit the maxi-
mum output current
1 k 10 k 200 k
10
100
1
100 k
3 m Cable
+ 3 nF
+ 30 nF
+ 100 nF
V
RMS
940768e
Frequency (Hz)
200
30
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