Larson Davis System 824, Справочное руководство

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11/8/00 RTA (optional) 10-7
Random Correction
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 2541 free-field microphone.
See Appendix C for the random inci-
dence correction filter’s response.
No - Random incidence correction is turned off.
Yes - Random incidence correction is turned on.
Autostore Settings Menu
Autostore
When a linear detector is selected,
the store rate is that of the linear
detector. Turns the Autostore function on or off. It allows the 824 to
measure and store basic information such as the Leq, Max,
and Min spectra when a measurement is ended by the trig-
gering setup or by pushing the run/stop key. When Autostore
is on, ByTime data is automatically stored in the Autostore
record if Save ByTime is set to Yes. For setups with a linear
detector, spectra are stored once every linear detector time.
When an exponential detector is
selected, samples are stored every
(exponential detector time) multi-
plied by the (exponential store rate). For setups with an exponential detector, samples are stored
every 1/256 of a second to every 32 seconds.
Pretrigger #
Pretrigger samples are only avail-
able when the trigger function is
used to start the measurement. Allows the user to select the number of pretrigger samples
that are stored with an Autostore ByTime record. The 824
keeps a circular buffer of the most recent 400 samples. The
buffer is reset every time a new run is started. The number of
spectra in the buffer is displayed in the Trigger Status view.
This setting determines how many of these spectra to copy
into the beginning of the Autostore record.
• 0 - 400 samples
Save ByTime
When Autostore is turned on, ByTime
records are automatically stored. This feature allows the user to enable or disable storage of
ByTime data in an autostore record. With this feature turned