Trigger & Alarm; Level Triggering - Gecko Compact Product User Manual

Trigger & Alarm
The primary function of the Gecko is as a continuous data recorder, but we realise that
triggering is still required to help find events of interest and to control alarms. The Gecko
has two Level trigger processes and an STA/LTA trigger process that can be enabled and
disabled. The Gecko also monitors some system parameters that can generate an alarm.
The Gecko logs the trigger time to a text file that can be used to help you find the data in
the continuous archive. This "trig.txt" file is located in the top level folder of the SD card.
We have developed a small application that can be copied to the Gecko SD card and run
from a Windows computer that will scan the trig.txt folder and then automatically extract
the continuous data from the archive, creating a discreet file in a folder called "reports" on
the SD card that contains one minute of data before and after the trigger time. At the same
time a PDF report is generated for the triggered event, with files named based on the local
time in your PC. This app simplifies vibration monitoring reporting for non-technical users.

Level Triggering

By default each Level trigger process is OFF, but simply toggle this using the Right button.
The Gecko will trigger on the vector sum of the 3D sensor channels. The percentage level of
the trigger threshold will affect the ground motion units displayed on the Set Trigger Level
screen. For accelerometers, the estimated MMI and PEIS intensity that relates to this trigger
threshold will also be displayed.
Use the Up/Down buttons to change the number values from 0.01% to 99.99% of the
recorder's full scale range. The line below will update with the ground motion value based
on the calibrated sensor sensitivity and gain of your Gecko.
Trigger & Alarm
> Level
STA/LTA
Alarm Outputs
System Alerts
Level Triggering
> Enable: On
Set Trigger Level
% of Full Scale
5.00 %
0.10316 g
MMI: VI PEIS:
15
6