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:
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