Larson Davis System 824, Technical Reference Manual

Page: 245 / 673

9/29/09 Using ID Setting Files 7-41
Excd Time Hist - (LOG)
The Excd Time Hist setting enables you to indicate whether
or not to have an Exceedance Time History saved as part of
the exceedance. This setting provides the following two
options:
Yes
- The Exceedance Time History will be saved.
No
- The Exceedance Time History will not be saved.
T.H. Period - (LOG)
The T.H. Period setting allows you to set the period of time
for the Leq stored in the Exceedance Time History, in steps
of 1/32 seconds. This setting can take on any time value in
the following range:
1/32 - 32/32 seconds
Excd Trigger - (LOG)
The Excd Trigger setting enables you to select whether the
Exceedance Trigger utilizes the fixed trigger levels or uses a
special 10 dB rise then fall Passby trigger. This setting
provides the following two options:
Level
- Enables fixed level triggering.
Note: Minimum duration is not
considered when using the
Exceedance Trigger in Passby
Mode.
PassBy
- Enables 10 dB Passby triggering.
Excd Time - (LOG)
The Excd Time setting allows you to select whether the time
reported for the exceedance is the time that it started or the
time of the maximum level. This setting provides the
following two options:
Start
- The exceedance time will be logged at the
beginning of the exceedance event.
Max
- The exceedance time will be logged at the max-
imum level of the exceedance event.
Timed Excd Period - (LOG) This setting will extend an event to be at least as long as the
time set (mm:ss) if it is over the threshold for at least the
minimum duration.
NOTE: This setting is only available through the serial port.
using the command S76, see table "Setting Commands" on
page A-30Logging SLM Daily History Settings
Using the symmetry data provided
with every exceedance it is possible
to calculate the time of the Max even
though you choose to record the start
time of the event.