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Trigger & Alarm
The primary function of the Gecko is to record data continuously, but triggering is still
required to help detect 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 Windows application that can be copied to the Gecko SD card and run
from a PC that will scan the trig.txt folder and then automatically extract the continuous
data from the archive. The program will create a discreet file for each trigger time, stored in
a folder called "reports" on the SD card. Each waveform file 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.
Trigger List
The latest 20 trigger times stored in the "trig.txt" file are also visible via the LCD by
pressing the Right button from the home screen until you see the trigger list.
The latest event is at the top of the list (time in UTC) and you can scroll down to view older
trigger times. The peak 3D and 1D signal levels that occurred within the first 10 seconds
after the event was detected are shown in the units of the 3D and 1D sensor.
An "s" after the trigger time indicates the Trigger was generated by the STA/LTA process.
Similarly "p" indicates a Level-High trigger, and "q" indicates a Level-Low trigger.
Trigger & Alarm
Level – High
> Level – Low
STA/LTA
Alarm Outputs
System Alerts
Time
mm/s
0123:45s 697.1 155.1
2359:59s
25.6
2230:00s
11.1
15
dB
88.8
70.0
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