Larson Davis 831 - Time History; Metrics Logged

Model 831 Manual Time History 11-1
CHAPTER
11
Time History
This chapter describes the measurement features
associated with the optional data logging firmware 831-
LOG and 831-FST.
Metrics Logged
Using the Time History mode, the Model 831 can
automatically log a large number of metrics, or parameters,
both acoustic and non-acoustic, at equal time intervals.
Available Time Intervals
831-LOG
When the Model 831 has the optional firmware 831-LOG
enabled, the available range of intervals is from 20
milliseconds to 24 hours.
831-LOG and 831-FST
When the Model 831 has both the optional firmware 831-
LOG and 831-FST enabled, the available range of intervals
is from 2.5 milliseconds to 24 hours. For more detailed
information, see "Increased Time Resolution” on page 11-2.
Available Metrics
Interval
When the user-selected time interval is 00 milliseconds,
any or all of the metrics listed in the following sections will
be measured and stored for each time increment.
When the user-selected time interval is 
50 milliseconds,
the only metrics which can be measured and stored are those
shown in bold in the following sections.