Larson Davis System 824 Training Manual

6-44 System 824 Training Manual 2/19/98
Step 6 Let’s enter a level of “085 dB”. After you have
chosen this “SPL Excd Lvl 1”, press c to
enter the selection.
You can set the other three exceedance level parame-
ters (SPL Excd Lvl 2, Pk-1 Excd Lvl, and Pk-2 Excd Lvl)
in the same fashion. For this exercise, we will ignore
them.
“Hysteresis” is used to establish the
end of an exceedance event. It is the
value, in dB, that must drop below
the exceedance level to signify the
end of the event. For example, if we
consider our established “SPL Excd
Lvl 1”, a hysteresis value of 5 would
mean that during an exceedance
event, if the SPL level drops below
80 dB (SPL Excd Lvl 1 minus Hys-
teresis), the 824 will stop gathering
data, and re-arm its trigger for the
next exceedance event.
Step 7 Press d to highlight “Hysteresis”.
Step 8 Let’s set the “Hysteresis” to 5. Press r to
enter the “Hysteresis” window.

Larson Davis System 824 Specifications

General

Brand	Larson Davis
Model	System 824
Category	Measuring Instruments
Language	English