7-8 824 Reference Manual 9/29/09
NOTE: The Range setting is not meant to
be switched dynamically in real time—in
part because selecting the “High” option
requires a stabilization period.
Furthermore, the System 824’s large
dynamic range (110dB) often makes
dynamic range switching unnecessary.
The Range setting merely allows you to
move the available dynamic range either
up or down when you need to measure
extremely high or low sound levels.
Transducer Setting - (SSA,
LOG, ISM)
Transducer sets the desired transducer. This setting provides
the following three settings:
NOTE: Using an electret microphone
with the polarization voltage supplied
with the “condnsr” option, will change
the microphones sensitivity and
frequency response characteristics.
Condnsr - This indicates that the microphone
being used is an air condenser type and the System
824 will generate the appropriate polarization
voltage to make it function properly.
NOTE: The frequency characteristics of
the 377B41 & 377A60 microphones
change sufficiently enough in high range
as to no longer meet Type 1 standards.
Thus we recommend using the normal
sensitivity microphones, such as 2540 &
2559 to measure high amplitude signals.
NOTE: The transducer setting is a
system setting that is not saved or
recalled with an ID even though it
appears in the SETUP menu.
Elctret - This indicates that the microphone being
used is an “electret” (pre-polarized) microphone.
The instrument will not generate any polarization
voltage.
Direct - This indicates that no microphone is
being used and that electrical signals are being
injected directly into the preamp. The instrument
will not generate any polarization voltage.
Random Incidence Microphone
Correction - (Available to all
Instrument types)
The Random Corr setting gives you the option of turning on
a digital filter to provide the correction necessary to provide
a random incidence response when measuring with a 2540
or 377B41 free-field microphone.
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