Geospace GSX-LF User manual

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GSX-LF User Manual
Geospace Seismic Recorder (GSX-LF)
USER MANUAL
7007 Pinemont
Houston, TX 77040 USA
This device complies with Part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) this device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
CAUTION: Any changes or modifications to this device not explicitly approved by the manufacturer could void your authority to operate this
equipment.
FCC
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful
interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Industry Canada
(English)
This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device
may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the
device.
(French)
Le présent appareil est conforme aux CNR d’Industrie Canada applicables aux appareils radio exempts de licence. L’exploitation est autorisée
aux deux conditions suivantes : (1) l’appareil ne doit pas produire de brouillage, et (2) l’utilisateur de l’appareil doit accepter tout brouillage
radioélectrique subi, même si le brouillage est susceptible d’en compromettre le fonctionnement.

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GSX-LF User Manual
GSX-LF MODULE
Deployment
The GSX-LF should be deployed with the metal plate down. This provides sufficient earth grounding and
maximum cooling of the unit as well as providing the GPS receiver in the top to the unit with an ideal
“view” of the satellite constellation. The grounding spike should be fastened to the unit prior to
deployment to provide maximum earth coupling. The unit should be transported on its side in order to put
the unit into standby mode and minimize battery consumption prior to use. Once the unit is ready to be
deployed it should be flipped spike down and the GSX-LF will immediately begin power on self-test.
The GSX-LF will test all of its internal circuits followed immediately by an impedance test of the seismic
sensors. The LED that can be seen from the top of the GSX-LF will flash codes to indicate the GSX-LF’s
condition. The GSX-LF will enable the Global Positioning System (GPD) receiver and begin to flash the
code that indicates that it is searching for satellites. Within a few seconds the GPS receiver will have
sufficient satellite information to obtain a 3 dimensional fix. The flash code will change to indicate this
condition and the GSX-LF will now begin to acquire seismic data if it has been programmed to begin
recording immediately. See Programming below. After several minutes the internal GSX-LF clock will be
sufficiently disciplined and the GPS receiver will be turned off. The flash code will again change to
indicate this state. See the flash codes below.
Radio Status Monitoring
A GSX-LF may be connected to a laptop computer and used as a hub to monitor the status of any GSX-
LFs within a 50m to 100m radius via a high frequency radio link. In this mode the laptop/hub monitors
and logs status information from all of the GSX-LFs that it communicates with. The laptop stores the
GPS location, acquisition status, temperature, battery status and the nonvolatile memory status of each
GSX-LF. By moving the hub throughout the seismic spread all of the GSX-LFs in the survey may be
monitored and logged. This logging may take place during acquisition of seismic data with no adverse
effect on the data quality.

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GSX-LF User Manual
Flash Codes
GSX-LF Start-up Error Codes
Critical GSX-LF Error: LED flashes repeatedly on solid for 1 second followed by off for one second.
Critical Seis Input 1 Error: LED on solid for 1 second followed by 1 short pulse.
Critical Seis Input 2 Error: LED on solid for 1 second followed by 2 short pulses.
Critical Seis Input 3 Error: LED on solid for 1 second followed by 3 short pulses.
Critical Seis Input 4 Error: LED on solid for 1 second followed by 4 short pulses.
Critical Battery Error: LED on solid for 1 second followed by 5 short pulses.
Non-Volatile Memory Error: LED on solid for 1 second followed by 6 short pulses.
Non-Volatile Memory Full: LED on solid for 1 second followed by 7 short pulses.
GSX-LF Run Time Codes
GPS on but no GPS fix: One LED flash per second.
GPS on with GPS fix: Two quick flashes once per second.
Recording with GPS off: One quick flash each 8 seconds.
Sleeping: Two quick flashes each 10 seconds.
Running geophone tests: LED flashes on for 10 ms 5 times per second.
Downloading
The GSX-LF non-volatile memory may be read and cleared by removing the battery connection
and inserting the unit into one of the outlets in the GeoReaper. See the GeoReaper User Manual
for further instruction.
Programming
The GSX-LF recording parameters such as sample rate, pre-amp gain, record mode, and testing,
are programmed and stored in non-volatile memory in the GSX-LF by the GeoReaper. See the
GeoReaper User Manual for further instruction.