Geospace Technologies GSR Geospace Seismic Recorder (GSR) User Manual Geospace Seismic Recorder GSR
Geospace Technologies Corporation Geospace Seismic Recorder (GSR) Geospace Seismic Recorder GSR
Users Manual Revised
Geospace Seismic Recorder (GSR)
USER MANUAL
OYO GEOSPACE
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.
Changes or modifications not expressly approved by Oyo Geospace could void the user’s authority to operate this equipment.
Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC
Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own
expense.
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GSR MODULE
Deployment
The GSR 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 satalite constellation. The seismic sensors should be
deployed and plugged into the seismic input connector prior to connection of the battery. The
seismic input connector is black on the single channel unit and blue on the multiple channel
units. Once the sensors are deployed and attached, connect the battery cable to the red
connector. The GSR will immediately begin a power on self test.
The GSR 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 GSR will flash codes to indicate
the GSRs condition. The GSR will then enable the Global Positioning System (GPS) receiver
and begin to flash the code that indicates that it is searching for satalites. Within a few seconds
the GPS receiver will have sufficient satalite information to obtain a 3 dimensional fix. The
flash code will change to indicate this condition and the GSR will now begin to acquire seismic
data if it has been programmed to begin recording immediately. See Programming below.
After several minutes the internal GSR 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 GSR may be connected to a laptop computer and used as a hub to monitor the status of any
GSRs within a 50m to 100m radius via a high frequency radio link. In this mode the loptop/hub
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GSR User Manual 3of 7 16 June 2008
monitors and logs status information from all of the GSRs that it communicates with. The
laptop stores the GPS location, acquisition status, temperature, battery status and the non-
volatile memory status of each GSR. By moving the hub throughout the seismic spread all of
the GSRs 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.
Flash Codes
GSR Start-up Error Codes
Critical GSR 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-Volitile Memory Error: LED on solid for 1 second followed by 6 short pulses.
Non-Volitile Memory Full: LED on solid for 1 second followed by 7 short pulses.
GSR 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 GSR 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 GSR recording parameters such as sample rate, pre-amp gain, record mode, and testing,
are programmed and stored in non-volatile memory in the GSR by the GeoReaper. See the
GeoReaper User Manual for further instruction.
• Scalability greater than 50,000 channels
• Delivers high resolution with a 24-bit delta-sigma ADC
• Built-in GPS receiver and disciplined clock
• Up to 30 days of continuous recording
• Compatible with explosive, vibratory and impulsive energy sources
• Accepts standard analog sensor inputs
• Has a built-in full resolution test generator
• Available as 1, 2, 3 or 4 channel versions
• Has an LED Status/Deployment State Indicator
• RFID for location/inventory assistance
• Wireless short range communication for status verification
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Geospace Seismic Recorder (GSR)
GSR System Tests
The seismic channel performance and sensor tests can be
performed by the GSR System. The user can choose a partial or
complete set of tests that can be run in sequence. The user can
also choose to display all of the results or only the failures. In the
tests described below, the System Software automatically controls
the Channe
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l Input Switch Positions and Test Oscillator Settings
during the tests. All tests can be run at all sample intervals and
preamp gains of the GSR.
- Harmonic Distortion - Gain Accuracy
- Impulse Response - Common Mode Rejection
- Equivalent Input Noise - Geophone Impedance and THD
- Instantaneous System Dynamic Range - Crossf
eed (multi-channel)
All specifications subject to change without notice
Cable-Free
Autonomous Data Recording
The GSR is designed for cable-free/radio-free
seismic data recording. The self-contained unit
includes 1 to 4 channels of 24-bit digitization, an
integrated/high sensitivity GPS receiver, built-in
test signal generator, up to 4 GB per channel of
non-volatile solid-state data storage, and a high-
speed data port. The unit is housed in a sealed
case, with input connector, extended life battery
connector/data port connector.
Above: GSR Data Recorder.
Below: GSR unit connected to geophone string and battery unit.
Above: GSR Battery Unit
Geospace Seismic Recorder (GSR)
Features and Specifications
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24-bit digital recorder
Built-in GPS and disciplined clock
Built-in full resolution test signal
generator
Solid-state flash memory
Scalability greater than 50,000 channels
Greater than 30 days of continuous
recording
Compatible with vibratory, explosive and
impulsive energy sources.
LED Status/Deployment State Indicator
RFID for location & inventory assistance
Accepts standard analog sensor input
IEEE 802.15.4 wireless status retrieval
• Available as 1,2,3, or 4 channel versions
• 24-bit delta-sigma ADC
• 3 Hz to 1600 Hz freq. response
• <1 μsec. of UTC (GPS clock)
• Up to 4 GBytes per channel flash memory
storage
• 12 Volt external battery
• Operating Temperature: -40° C to +85° C
• Humidity: 0 to 100%
• Selectable Gains:
- X1, X2, X4, X8, X16, X32, X64
0, 6, 12, 18, 24, 30, 36 dB
• Sample Intervals:
- 4, 2, 1, .5, .25 milliseconds
• Max Timing Error: 20 μseconds
Max input signal: 1.80 Vrms @ 0 Gain
Total Dynamic Range: 140 dB
System Dynamic Range @ 0dB Gain:
126 dB @ 4 msec SI
124 dB @ 2 msec SI
120 dB @ 1 msec SI
117 dB @ .5 msec SI
106 dB @ .25 msec SI
Equivalent Input Noise @ 2 msec SI:
1.13 μV @ Gain 0 dB
.58 μV @ Gain 6 dB
.33 μV @ Gain 12 dB
.22 μV @ Gain 18 dB
.19 μV @ Gain 24 dB
.18 μV @ Gain 30 dB
.17μV@Gain36dB
Input Impedance:
20 kohms/0.06 μf Difference Mode
205 kohms Common Mode
System Dynamic Range @ 2 msec SI
124 dB @ Gain 0 dB 123 dB @
Gain 6 dB 122 dB @ Gain 12 dB
120 dB @ Gain 18 dB 115 dB @
Gain 24 dB 110 dB @ Gain 30
dB 105 dB @ Gain 36 dB
Total Harmonic Distortion: 0.0005%
Common Mode Rejection: 0.001%
Gain Accuracy: 1%
Anti Alias Filter:
Rejection @ Nyquist: 130 dB
Frequency @ -3 dB: 0.87 Nyquist
Linear or Minimum Phase
Time Standard: <1 ppm
Weight: 2 pounds
Max. Dimension: 3.5"Wx3.0"Hx6.67"L
For more information: gshields@oyogeospace.com • Tel: 713.986.4444 • Fax: 713.986.4445
All specifications subject to change without notice
Geospace Seismic Recorder (GSR)
GeoRes-XTC GSR Data Management System
The GeoRes-XTC consists of two embedded software modules:
GeoReaper performs pre-deployment param rete programming, i.e. sample rate, pre-
amp gain, record mode, testing, etc. and data c eoll ction via Ethernet connection to the
Data Transfer Module (DTM) and a high speed PC.
GeoMerge allows the system to read and import all three major components of SPS (R,
S and X records). It will merge all GSR data int Eo S G-D or SEG-2 files according to SPS
X records (Cross-Reference File, sorted in the same order as the Source 'S' File) and
convert all latitude and longitude information in hto t e same coordinates used in the SPS
files. These data are then output to the field dat hard media abase (RAID memory) and/or
(tape, disk, etc.).
The GeoRes-XTC is compatible with third pa tyr generated SPS files.
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GeoRes-XTC High Spee
d Computer Data Transfer Module (DTM)
7007 Pinemont • Houston, T xas, U.S.A. • www.oyogeospace.com e
Tel: 713 986-4444 • Fax: 713 986-4445
Regional
Offices
OYO Geospace Canada, Inc.
2735-37 Avenue N.E. Calgary,
Alberta, Canada T1Y 5R8 403
250-9600
OYO Geo-Impulse International LLC
Kirovogradska 36 Ufa, ya,
Baskortostan, Russia 450001 011
(7) 3472 25 39 73
OYO Geospace China
Room 700, 7th Floor, Lido Office Tower, Lido Place
Jichang Road, Jiang Tai Road, Beijing, 100004, P.R.China
011 (86) 10 643 78 758
OYO Instruments, Europe Ltd.
F3 Bramingham Business Park, Enterprise Way, Luton
Bedfordshire LU3 4BU, England
011 44 (0) 1582 573 980