Brüel & Kjær 1627 Instruction Manual

Instruction Manual
lnfrasound and Ultrasound Filter Set Type 1627
lnfrll•
G1 •
Ga•
A Filter Set to make use of the extended
frequency range of the Modular Precision
Sound Level Meter Type 2231. Its six filter
networks include G1 and G2 which allow
infrasound measurements (ISO/DIS 7196).
Measurements of audible sound in the pres-
ence of ultrasonic noise are possible with
filter network U (Audio) which complies with
IEC TC 29-169/WG 16. The other filter net-
works are: U1, a proposed weighting which
approximates the sensory perception of ul-
trasound; Ultra, a 12,5 kHz high-pass filter;
Infra, a 20Hz low-pass filter; and Linear.
Type 1627 can also be fitted to the Sound
Level Meters Types 2230, 2233 and 2234,
but only a limited use can be obtained.
A special microphone adaptor is included to
extend the useful low frequency range of
the
1
/2-inch Microphone Type 4155 or 4165
to below 1 Hz. Type 1627 snaps onto the
bottom of Sound Level Meter, forming a
self-contained lightweight instrument.
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BrUel
&
Kjcer