Larson Davis 824 User Manual

9/29/09 RTA (optional) 11-11
Trigger Settings Menu
Trigger Mode
The 824 triggers and starts recording an Autostore record
when Armed and the following conditions are met:
• Now - The 824 starts recording an Autostore immedi-
ately.
• L < - When the level is less than the “Trigger Level” for
“Trigger Time”, then, the 824 begins recording an Autos-
tore.
• L = - When the level is equal to the “Trigger Level”, +/-
0.5 dB, for “Trigger Time”, then, the 824 begins record-
ing an Autostore.
• L > - When the level is greater than the “Trigger Level”
for “Trigger Time”, then, the 824 begins recording an
Autostore.
• Input - The 824 starts recording an Autostore when the
logic input line changes to “Trigger Logic In” state.
• Time - The 824 starts recording an Autostore after “Trig-
ger Time” seconds.
• Count - The 824 starts recording an Autostore after
“Trig Samples” of data have been received.
Trigger Level
“L” indicates the level of the filter
specified by the Trigger Source
setting.
This level is used when the “Trigger Mode” is set to Level
(L<, L=, L>). This is the amplitude in dB at which the 824
will start recording an Autostore record. It must be valid for
the period of time set by “Trigger Time”.
• 0.0 - 255.9 dB
Trigger Time
When the “Trigger Mode” is set to Time, this is the time that
must pass before the 824 starts recording an Autostore
record. This is also a qualifier for the level settings. If the

Larson Davis 824 Specifications

General

Brand	Larson Davis
Model	824
Category	Measuring Instruments
Language	English