Larson Davis 824 User Manual

9/29/09 System 824 Views 5-43
Pause - Indicates the measurement paused at this
time.
Cont - Indicates the measurement continued at
this time.
Mark - Indicates a marker was set at this point in
time.
Time Cursor- The Time Cursor (the vertical bar) allows
you to scroll graphically through the history of the displayed
measurement readings using the
landrarrow keys.
The Time History display’s Status Indicator will show what
event took place at the point in time associated with the
Time Cursor’s current position.
See the section "Other Level - (LOG
only)" on page 7-33 for additional
details.
Other level - A wide range of different parameters can be
displayed in this window depending upon the setup
procedure utilized.
Single Other Level The simplest situation is when the user selects to display a
single alternative sound level parameter, Pk-II, Pk-I or
Lmax, which is setup directly using the Other Level menu in
the Time History menu. In this case, the value of this
particular parameter will always appear in the same position
as shown by the Lmax display in the figure above.
Multiple Other Levels Alternatively, the user could select from as many as forty
different parameters, which could include sound pressure
levels with different weightings (A, C, or F) and different
averaging times (S, F, I), RTA Spectra and even some non-
acoustic parameters such as Wind/Tach data, Temperature
(824 interior), External Voltage and Battery Voltage. Setting
up for multiple other levels requires the use of the Advnc TH
menu in the Time History menu. The selected parameters
will be displayed in the same position as Lmax in the figure
above. Use the
uand darrow keys to scroll through the
other selected parameters. The following shows how six
different values of “other parameter” can be displayed on
one particular Time History View by using these arrow keys.
The graphics on the second row indicate Windspeed, Wind
Direction and Temperature (measured using a temperature
transducer inside the System 824).

Larson Davis 824 Specifications

General

Brand	Larson Davis
Model	824
Category	Measuring Instruments
Language	English