7-6
824 Reference Manual
9/29/09
There are certain features (such as
event counting) that function only
with one selection of frequency
weighting and one selection of
detector, both user selected. These
same weighting and detector
selections also determine the metrics
used for features such as L
N
,
Intervals, Exceedances, etc.
Impl
-
An impulse detector which has a very fast
rise time (a 35 mS time constant) but a very slow
decay time.
Weighting Setting - (SSA, LOG,
ISM)
Weighting -
selects the desired frequency weighting for the
RMS and secondary peak detectors. The
Weighting
setting
provides the following three options:
A
-
The instrument uses an A-weighted input filter.
C
-
The instrument uses a C-weighted input filter.
FLT
-
The instrument uses Flat weighting (see
specifications for passband frequency in Appendix
C).
Gain Setting - (SSA)
The Gain setting is only available in
the SSA instrument. The -10 and -20
dB gain settings are not available for
electret or direct transducer types
(see “Transducer”).
Gain
- The gain setting sets the measuring range of the
instrument in 10 dB steps by adjusting the amplification of
the microphone’s signal. The gain is set from the
SSA Setup
Menu
, highlighting and selecting
SLM
, then
Gain
to obtain
the following
Gain Menu.
In the display, the lowest and highest levels that can be
measured accurately are indicated by each live display’s
graph scale. The following selections are available:
Summary of Contents for System 824
Page 1: ...Model 824 Precision Sound Level Meter Real Time Analyzer Reference Manual...
Page 2: ......
Page 3: ...I824 01 Rev P Technical Reference Manual Larson Davis Model 824...
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Page 366: ...10 36 824 Reference Manual 9 29 09...
Page 460: ...A 4 824 Reference Manual 9 29 09 shown below Both versions work properly with the Model 824...
Page 538: ...A 82 824 Reference Manual 9 29 09...
Page 546: ...B 8 824 Reference Manual 9 29 09...
Page 569: ...9 29 09 C 23 Windscreen Response with Respect to No Windscreen...
Page 596: ...C 50 824 Reference Manual 9 29 09...
Page 630: ...E 10 824 Reference Manual 9 29 09...
Page 638: ...F 8 824 Reference Manual 9 29 09...
Page 648: ...G 10 824 Reference Manual 9 29 09...
Page 672: ...iv xxiv Index Model 831 Technical Reference Manual...