9/29/09 Using ID Setting Files 7-29
Wind/Tach Enable
Note that when the Wind/Tach
feature is enabled, Ln will
automatically be enabled as well.
When this occurs, the message
“Setting Conflict” will be shown.
Select Yes to enable the Wind/Tach function. If disabled by
selecting No, Wind/Tach data will not be measured and no
corresponding data will be displayed in Views or presented
in measurement results.
Windy Threshold “Windy” is a condition defined by wind speed above a user-
defined threshold value. Since wind can influence the
propagation of sound, it is useful to note measurements
which were made during periods of higher wind levels. The
threshold level is entered as a number field using the Wind
Units defined above.
Wind Exceedance Level The wind exceedance level represents a second threshold
level, higher than that associated with Windy. Most often
this is defined to be the wind level above which airflow over
the microphone generates pressure variations not associated
with actual acoustic signals. These pseudo-sound signals are
detected by the microphone, producing erroneous results.
The System 824 can be set to pause sampling of the sound
signal when the measured wind levels exceed this level. The
instrument will also count the number of times the wind
exceeds this level.
Windy Hysteresis To prevent multiple triggering/counting of the same Wind
exceedance event, a hysteresis value may be entered. The
event is triggered when the wind level goes over the Wind
exceedance level, but does not become re-armed until the
level drops below the value of the exceedance level minus
the hysteresis value.
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