Larson Davis System 824, Technical Reference Manual

Page: 211 / 673

9/29/09 Using ID Setting Files 7-7
NOTE: If Gain is set to -10 or -20 dB
and the microphone type is not
condenser then the gain is set to 0 dB
and the warning “Setting Conflict”
is displayed. -20, -10, 0, +10, +20, +30, +40, +50
Use the
u
and
d
keys to highlight the desired value
of gain and press
c
Check key.
Range Setting - (LOG, ISM)
The Range setting is only available
to the LOG and ISM instrument. Range selects the measurement range you desire for the
instrument. This setting provides the following three
options:
NOTE: If Range is set to “Low” and
the microphone type is not condenser
then the range is set to “Normal”
and the warning “Setting Conflict”
is displayed. Normal - The instrument’s available dynamic
range is positioned in the “normal” range which is
typically 20dB to 130dB when using a Lar-
son•Davis high-sensitivity microphone.
Low - The instrument’s input circuitry provides an
additional 20dB of gain which has the effect of
moving the instrument’s available dynamic range
downward relative to the “normal” range. The net
effect is that you can measure lower-level sounds
effectively. The degree of benefit varies depending
upon the weighting or filter that you are using.
High Range is not available for
electret or direct transducer types
(see “Transducer Setting” below). High - The instrument’s sensitivity is reduced by
20dB, which has the effect of moving the instru-
ment’s available dynamic range upward relative to
the “normal” range. Therefore you can measure
higher-level sounds effectively. The benefit varies
depending upon the weighting or octave filter that
you are using.