Gecko Compact Operational manual

Gecko
141 Palmer Street, Richmond VIC 3121 Australia T:[phone] [email protected]
For all models: Compact, Rugged, Blast, Tremor, Prism, SMA & SMA-HR
Seismographs, Accelerographs
Recorders, Vibration Monitors

Gecko Firmware V6.2
Welcome to the world of simplified seismic recording with your new Kelunji Gecko
seismograph. Within minutes you can be recording earthquakes, blasts and other ground
vibrations using our latest generation instrument that makes high dynamic range, high
sample rate, low power, continuous recording accessible to experts and novices alike.
In the Gecko, we have simplified the modern digital seismograph. The low cost of flash
memory means you can save weeks, months, even years of continuous data on a single
memory card. The Gecko can record everything continuously while logging trigger times for
you to sort through back at the lab. Even if your trigger settings missed the event, you’ll
always be able to retrieve that chunk of time from the continuous archive.
An even more efficient way of managing your data is not to have to collect it at all, so we
have included a simple telemetry protocol that streams data packets over the Internet via a
cellular data modem or Ethernet/WiFi link. Data from all of your stations is then available in
a single archive for you to access whenever you need it. Simply install our free “Streams”
data reception software on your Windows, Mac or Linux PC and watch your data live on
screen while it is archived away to your PC. Streams is ideal for collating data from multiple
network-connected structural monitoring instruments. Download it free today from the SRC
website: https://www.src.com.au/downloads/live-stream/
Our “Waves” waveform analysis application is available as a free download for Windows,
Mac and Linux from http://www.src.com.au/downloads/waves/ . Each Gecko purchased is
entitled to one Waves product key that will remove the advertisement that pops up for 10
seconds when you launch the program. You can email [email protected] with your recorder
serial number to obtain a product key. Each product key can only be used once and is not
transferable to another computer.
Happy recording!
From the Gecko development team.

Table of Contents
Getting Started ................................................................................ 1
Setting up your recorder .................................................................................... 1
The User Interface ............................................................................................. 2
Menu Map ........................................................................................................... 3
The Home Screen ............................................................................. 4
Status Screen Loop – Right Button ..................................................................... 4
Realtime Data Loop – Up Button......................................................................... 5
Vector Sum .......................................................................................................5
Sensor Signal ....................................................................................................5
Raw Signal ........................................................................................................5
The Main Menu ................................................................................. 6
Unmount SD card ............................................................................................... 6
Data Storage .....................................................................................................7
Station Info ........................................................................................................ 7
Station Code......................................................................................................8
Network Code ....................................................................................................8
Location ID........................................................................................................8
Sample Rate ....................................................................................................... 9
Channels to Store ............................................................................................. 10
Channels to Send.............................................................................................. 10
Sensor Setup .................................................................................................... 11
3D Sensor ....................................................................................................... 11
1D Sensor ....................................................................................................... 14
Input Amplifier................................................................................................. 14
Trigger & Alarm................................................................................................ 15
Trigger List...................................................................................................... 15
Level Triggering ............................................................................................... 16
STA/LTA Triggering........................................................................................... 16
Alarm Outputs ................................................................................................. 17
System Alerts .................................................................................................. 17
On-screen Alerts .............................................................................................. 18
Telemetry ......................................................................................................... 18
Mode .............................................................................................................. 19
Device ............................................................................................................ 19
Settings File ..................................................................................................... 20
Start Calibration ............................................................................................... 20
Data Storage and Formats.............................................................. 21
The Root Directory ........................................................................................... 22
The Data Folder ............................................................................................... 22
The Histogram Folder........................................................................................ 23
MiniSEED files................................................................................................... 23

Upgrading the Gecko firmware ......................................................................... 24
Ports & Wiring................................................................................ 24
Power connector .............................................................................................. 24
Alarm & Communications port .......................................................................... 25
4D Sensor port (2018 Compact & Rugged) ....................................................... 25
1D Sensor port (mid-2019 Blast & SMA)........................................................... 25
Technical Specifications ................................................................. 26
Register your Gecko ....................................................................... 29
Warranty........................................................................................ 30
Extended warranty ........................................................................................... 30
Appendix A..................................................................................... 31
Installing the Gecko Blast or SMA..................................................................... 31
Gains, range and clip levels ............................................................................... 32
Installing the Gecko Pro-bodied sensors .......................................................... 33
Calibrating a Gecko SMA-HR .............................................................................. 35
Checking Prism Operation.................................................................................. 36
Appendix B..................................................................................... 37
Internal Battery ............................................................................................... 37
Charge Regulator ............................................................................................. 38
LED Patterns (routine) ...................................................................................... 38
LED Patterns (exceptions) ................................................................................. 38
Appendix C..................................................................................... 39
USR-W610 Ethernet & WiFi Adaptor ................................................................. 39
Quick Configure ............................................................................................... 39
Troubleshooting ............................................................................................... 41
Appendix D..................................................................................... 42
NTC 221 4G Modem & Ethernet Router ............................................................. 42

1
Getting Started
All Gecko models have a 2-pin power port, 6-pin alarm/communications port, and a coaxial
GPS aerial connection. From mid 2019 Gecko Blast & SMA models also have a 4-pin port for
an external sensor channel. Gecko Compact & Rugged have a 19-pin sensor connection.
Setting up your recorder
The two-pin connector is the power input to the Gecko. The default Gecko operating voltage
range is 11.8 to 24 Volts DC (useful for 12V DC battery over-discharge protection), but it
can be factory switched to extend the range to 7V to 30V DC at no cost. If the power is
removed then restored, the Gecko will restart using the saved settings.
The Gecko only takes a few seconds to initialise the operating system after power is applied.
If an SD card is installed at power-up, the card is checked during the boot process. When
the card is ready, the Gecko will start storing continuous data within a few seconds.
The small gold coaxial socket is the connection for the GPS aerial. The GPS is crucial in
maintaining accurate absolute time to synchronise recordings from various instruments and
monitoring locations, but it also provides global position information. Simply screw the GPS
cable plug onto the threaded GPS socket until finger-tight.
The Gecko Compact and Rugged is supplied with a sensor plug which you can attach to your
sensor cable. You can find the wiring diagram at the end of this manual. Align the keyed
plug with the socket and push it on, locking it in place with the bayonet-style collar.
At this point you now have a fully functioning recorder, but you will need to modify some
settings to suit your application. Setting a unique station code is an essential starting point.

2
The User Interface
The Gecko does not require a computer to control it. All recorder settings are accessible
through the LCD and are modified using the four control buttons.
Gecko Compact (above)
Gecko Rugged; and Gecko digital velocity sensors (above)
Gecko digital acceleration sensors (above)
SEISMOGRAPH
RIGHT
MENU
(LEFT)
UP DOWN
ACCELEROGRAPH
RIGHT
MENU
(LEFT)
UP DOWN

3
Menu Map
After start-up, pressing the Menu button will toggle between the main menu and the home
screen. The LCD backlight will stay on for 2 minutes from the last button press.
On most screens you can scroll Up and Down through a list and enter a menu item or
toggle a setting by using the Right button. Pressing the Menu button will save the current
setting and take you back one menu level.
Pressing Up from the home screen shows signal levels in various ways. Pressing the Right
and Down buttons modifies the signal levels, as described in the orange box below.
Depending on the model of Gecko and your current configuration, some menu items may be
hidden from view.
For example, if you have a Gecko with an internal 3D sensor, the 3D sensor menu will not
be accessible as users should not change the sensor configuration. Older model 3-channel
Gecko recorders will not show the 1D sensor menu, and if your chosen sensor does not
have a calibration duration, the Start Calibration option is hidden.
Peak Signal Sensor Signal Raw Values
3D 0.1234567 mm/s Next screen (shown at right) 2019-04-01 11:52:18 Next screen (shown at right) E: -2,726 0.6
max 11.1234567 mm/s uu Clear max values E: -0.0439408 mm/s uu Offset Signal to Zero N: 4,326 0.8
1D 80.2123546 dB N: 0.0360011 mm/s uq Clear Zero Offset Z: -698 0.7
max 101.1234567 dB
Back to Home Screen Z: -0.0011021 mm/s Back to Home Screen O: 12,356 1.2
p
Home Screen Info & Telemetry 3D/1D Sensor Info GPS location information Recent Triggers
2019-04-01 11:52:16 Volt: 14.06 250sps 3D Sensor Name & S/N Lat: -37.8189800 Time mm/s dB
GECKO Storing ENZO+ uTemp: 35.5° x1 uGecko Pro SMA-HR Long: 145.0109620 u0122:56s 690.1 105.0
GPS:04 Sending ___O+ #2000374 v6.2.4573 E:0123 N:4567 Z:8910 Sats: 12 Alt: 22m 2359:59s 10.3 89.1
32GB free:92.23495% Connected to Server Type: Acceleration hAcc: 6m vAcc: 14m 1326:46s 20.9 95.2
Station Information Save Continuous Data
Main Menu
Station Code Channel E: On
Send Continuous Data 3D Sensor
Unmount SD card > Network Code Channel N: On Channel E: Off Sensor Name
> Station Info Location ID (3D) Channel Z: On Channel N: Off > Type: Velocity
Sample Rate Location ID (1D) Channel O: On Channel Z: On Sensitivity ch E
Channels to Store 3D Vector: Off Channel O: Off Sensitivity ch N
Channels to Send 3D Vector: Off Sensitivity ch Z
3D Sensor
3D Sensor
Zero Correct: NONE
1D Sensor
1D Sensor
Select a Sensor
Select a Sensor
Cal Enable
Input Amplifier Select a Sensor > Sensor Serial No Customise Sensor Cal Type
Trigger & Alarm > Sensor Serial No Mass Lock > Geophone 28.8V/m/s Cal Duration
Telemetry Mass Unlock Geospace GS-1 1Hz Cal Sine Freq
Settings File Mass Centre ...<more> SIG+ Mode: Normal
Start Calibration
Trigger & Alarm
SIG- Mode: Normal
Level - High
Level Triggering
DC Offset: Normal
Communications
> Level - Low
STA/LTA Triggering
Enable: Off
STA/LTA Enable: Off > Sensor: 3D
% of Full Scale
> Mode: Continuous Alarm Outputs > Threshold Set Trigger Level 5.00
Device: Serial System Alerts STA window 1.2933 mm/s
...<more>
t
p
u
p
t

4
The Home Screen
The four lines on the home screen show:
• the Gecko clock’s date and time (in UTC – Universal Time Coordinated)
• the station code, and which channels are being stored to the SD card
• the number of GPS satellites visible; and what is being sent via Telemetry
• the SD card capacity and percentage of storage remaining
2020-09-01 06:17:52
GECKO Storing ENZO+
GPS:04 Sending ___O+
32GB free:92.23495%
“O” is the 4th channel on some Gecko models, and “+” is the vector sum of channels ENZ.
The “Storing” word animates using qdown arrows to indicate packets of data are being
written to the SD card. The “Sending” word animates using pup arrows to indicate packets
of data are being streamed to a remote computer.
Status Screen Loop – Right Button
The Gecko has several status pages accessible from the Home screen. Press the Right
button to scroll through them, or press the Menu button to return to the Home screen.
• The first screen shows input power voltage and CPU temperature, the current sample
rate and input amplifier (gain) setting, followed by the Gecko serial number and
firmware version number. The bottom line shows the telemetry connection status
• The next screen shows the name and serial number of the 3D sensor connected to
channels ENZ. The sensor type is shown on the bottom line
• If you have a 4-channel recorder, the next screen shows the 1D sensor information
• The next shows the GPS location information. The “hAcc” value is the horizontal
accuracy value of the GPS aerial position in metres as read from the GPS receiver,
and “vAcc” is the vertical accuracy.
• The final screen shows a list of the last 20 trigger times and peak values in the 10
seconds after the trigger time. An “s” after the time indicates it was an STA/LTA
trigger, a pindicates a Level-High trigger, and a qindicates a Level-Low trigger.
Use the Down button to scroll to older triggers, or Up to view the latest trigger.
Home Screen Info & Telemetry 3D/1D Sensor Info GPS location information Recent Triggers
2019-04-01 11:52:16 Volt: 14.06 250sps 3D Sensor Name & S/N Lat: -37.8189800 Time mm/s dB
GECKO Storing ENZO+ uTemp: 35.5° x1 uGecko Pro SMA-HR Long: 145.0109620 u0122:56s 690.1 105.0
GPS:04 Sending ___O+ #2000374 v6.2.4573 E:0123 N:4567 Z:8910 Sats: 12 Alt: 22m 2359:59s 10.3 89.1
32GB free:92.23495% Connected to Server Type: Acceleration hAcc: 6m vAcc: 14m 1326:46s 20.9 95.2
u

5
Realtime Data Loop – Up Button
Press the Up button from the Home screen to view real time sensor data.
Vector Sum
The first screen shows real time peak sensor output in
sensor units, calculated based on the sensor and gain
settings. Tap the sensor to see the numbers change.
It shows the live peak vector
sum of the 3D sensor, and holds the peak value (max). For
4-channel models, the live data from channel O is shown and
its peak (max) value is also held.
If you have a 3-channel recorder with an accelerometer connected (or have a Gecko SMA
variant) this screen will display an estimate of the Modified Mercalli Intensity (MMI) and
Philippine Earthquake Intensity Scale (PEIS) value based on the maximum displayed
acceleration. Press the Right button twice to clear the retained peak (max) values.
Sensor Signal
Press the Up button again to see the ground motion values
for each sensor axis. Pressing the Right button on this
screen will prompt you to either press the Right button
again to remove any signal offset (it averages the signal for
2 seconds), or press the Down button to clear the any existing offset correction. The Drift
Correction feature (see: 3D Sensor settings) will also correct signal offset over time.
Raw Signal
Pressing Up again will display the raw numbers from the analogue-to-digital converter
(ADC) in real time. The values shown are up to ±8.4 million recorder counts, which
represents a signed 24-bit range number.
The zero level can be controlled in the same way as the
Sensor Signal screen. If you have a 4-channel Gecko, the
date and time line will not be shown, with channel O
appearing at the bottom.
If STA/TA triggering is enabled, the STA/LTA ratio is also displayed in real time at the end of
each line. It is the ratio of the average signal in the short term divided by the average
signal in the long term. When nothing much is happening, this value will sit around 1.0, but
a short burst of anomalous signal will increase the number. This ratio may assist you in
determining at what level to set your STA/LTA trigger threshold.
3D 0.1234567 mm/s
max 11.1234567 mm/s
1D 80.0360011 dB
max 101.0011021 dB
Vector Sum Display
3D 0.002464 g
max 0.020267 g
MMI: IV PEIS: 4
2019-04-01 11:52:18
E: -0.0439408 mm/s
N: 0.0360011 mm/s
Z: -0.0011021 mm/s
2019-04-01 11:52:20
E: -2,726 0.6
N: 4,326 0.8
Z: -356 1.2

6
The Main Menu
Pressing the Menu button from the home screen will show you a list of actions and settings
for managing your recorder. The main menu includes some or all of the following items:
Main Menu
Unmount SD card
> Station Info
Sample Rate
Channels to Store
Channels to Send
3D sensor
1D sensor
Input Amplifier
Trigger & Alarm
Telemetry
Settings File
Start Calibration
If you change any settings, they are usually applied once you exit to the home screen. The
settings are automatically saved to the recorder’s configuration file.
Unmount SD card
Data is being sampled at all times, whether an SD card is present or not, because data may
be telemetered without an SD card. If there is no SD card, backfilling of unsent data will not
be possible.
Before you remove the SD card, you should unmount the SD card so that the system does
not try to write data to the card while it is being removed, an action that can corrupt the
current file, the FAT file system, or the SD card.
When you insert an SD card, it will automatically be mounted.