Larson Davis SoundAdvisor 831C Reference Manual page 123

SoundAdvisor Model 831C
Step 3
Check Enable Time History and select the desired time Period from the drop-
down menu.
Step 4
Enable the desired Time History Options. Not all options are available for every
time period. Table 16.1 shows data that is displayed for each Time History
Metric, depending on the Time Interval Option you select.
Setting up a Measurement With Time History 16-2