B&K 2250 Light Manual do Utilizador Página 260

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Hand-held Analyzer Types 2250 and 2270 User Manual
A.17 Generator
Table A.17 Generator Parameters
*
Parameter Values Comment
Generator Type Internal
External
Set to Internal to use the internal noise
generator as specified below.
Set to External to switch an external generator
on/off using a logic signal:
On = 4.5 V; Off = 0 V.
The generator signal appears at the Output
Socket.
Note 1: For Reverberation Time Software
BZ-7227, set Measurement Control, Excitation
= Interrupted Noise to enable the generator
parameters.
Note 2: For Frequency Analysis Software
BZ-7223, set Output Socket Signal, Source =
Generator to enable the generator parameters
Noise Type Pink
White
The type of noise from the internal generator.
The bandwidth of the noise will be adjusted to
the frequency range from Bottom Frequency
to Top Frequency
Level [re. 1 V] –60.0 to 0.0 dB This sets the internal noise generator
attenuation in dB, referenced to 1 V. This level
stays at the set level irrespective of the
frequency range
Sound Source Unknown
Type 4292 Optimum
Type 4295 Optimum
Type 4296 Optimum
Type 4292 Flat
Type 4295 Flat
Type 4296 Flat
This setting optimises the frequency response
of the internal generator output to the
connected sound source. The ‘Flat’ setting
optimises the output for a flat power response,
the ‘Optimum’ setting optimises the power
difference between adjacent 1/1- or
1/3-octave bands, while maintaining a ‘boost’
at low frequencies.
Select a type matching your sound source:
OmniPower Sound Source Type 4292 or 4296
or OmniSource Sound Source Type 4295.
Select Unknown if you are using another
sound source, or don't want to correct the
frequency response
Escape Time 0 to 60 s Set the Escape Time to allow the operator to
leave the room before the generator is turned
on and the measurement starts
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