7-30 824 Reference Manual 9/29/09
Wind Pause Enable Select Ye s to enable the Wind Pause Function. This will
cause the System 824 to pause sampling of the input signal
whenever the wind speed is above the Wind Exceedance
Level. Select No to disable this function.
Pulse Trigger Voltage Select 0.0 V for bipolar trigger signals which are essentially
AC; triggering occurs on the zero crossing.
Select 2.5 V for unipolar trigger signals, such as those based
upon 0-5 volt logic.
Pulse Source Generally the trigger signal for windspeed detection will be
from an external transducer connected to the 9-pin connector
labeled CONTROL. In this case, select Ext.
If Int is selected, the signal connected to the System 824
input will be used to determine the Wind/Tach level. This
setting will allow the measurement of the frequency of an
acoustic signal.
LOG and SSA Time History Settings
Time History Settings are available
to both the Logging SLM (LOG) and
SLM&RTA (SSA) instruments.
The time history recording stores an L
EQ
, and if desired, one
or more additional user-selected measurements, such as Lpk
or Lmax. Levels can be stored rapidly, up to 32 samples per
second with the LOG instrument and 8 samples per second
with the SSA instrument. Since this function continues
storing data as long as the measurement is in progress, the
combination of a fast storage rate and a long measurement
time can consume a large amount of data memory.
Hysteresis
Begin
End
dB
Trigger
Time
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