Geospace GSB User manual

GSB User Manual
GSB User Manual (593-01940-01 Rev C) release date: TBD Page 1 of 27
GSB
User Manual
Geospace Technologies Corporation
7007 Pinemont Drive
Houston, TX 77040
TEL [phone]
FAX [phone]
www.geospace.com

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© 2020 Geospace Technology Corporation
This document is copyrighted by Geospace Technology Corporation (GTC). No part of this publication
may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any
language or computer language in any form or by any means, electronic, manual, or otherwise, without
written permission of Geospace Technologies Corporation, 7007 Pinemont Drive, Houston, Texas 77040,
U.S.A. Copyright violators may be subject to civil penalties.
DISCLAIMER:
Geospace Technologies Corporation makes no warranties as to the accuracy, validity, or fitness for use
of the contents of this Manual. Geospace Technologies Corporation reserves the right to revise the
information in this Manual at any time without prior notice.

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Table of Contents
1. - Features...................................................................................................................4
2. – GSB data downloader and charger......................................................................5
2.1 – Portable chargers and data retrieval.............................................................. 5
2.2 – GSB trailer.............................................................................................................. 6
3. – GSB operational modes ........................................................................................6
3.1 – Record mode ......................................................................................................... 7
3.2 – Sleep mode............................................................................................................ 8
3.3 – Disabled mode...................................................................................................... 8
3.4 – Search lost device mode................................................................................... 8
3.5 – Powered off........................................................................................................... 8
4– Field operation instructions....................................................................................9
4.1 – Deploying GSBs................................................................................................... 9
4.2 – Picking up GSBs................................................................................................ 13
4.3 –GSB LED flash codes ........................................................................................ 15
4.4 – LineViewer, LHR+LHV operations ................................................................ 16
4.5 – Extended operation time ................................................................................. 17
4.6 – Charge of internal battery ............................................................................... 18
4.7 – Preparing GSBs for storage or shipment................................................... 19
5. – GSB test................................................................................................................20
5.1 – Instrument test ................................................................................................... 21
5.2 – Sensor test .......................................................................................................... 24
6– Attachments ...........................................................................................................26
6.1 – GSB-1 specifications........................................................................................ 26
6.2 –GSB-3 specifications ........................................................................................ 27

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1. - Features
The GSB is a continuous cable-free autonomous seismic data recorder unit that
includes a battery inside the case. There are models available for 1or 3 channels.
The GSB has two external connectors, one to download data/charge the internal
battery and the connector for the external geophone.
Features include
24 bits resolution and 124 dB instantaneous dynamic range
Battery life: 60 days @ 24 hours/day operation for 1 channel devices or
40 days for 3 channels
A low power option is available for GSB-3s to increase operation time
Record time can be extended by connecting an external battery or a solar
panel
Built-in full resolution test signal generator
Solid state flash memory: 16 or 32 GB (115-230 days at 2 ms SR per
channel)
No additional equipment required to start recording seismic data during
deployment
Provides QC status via radio to LHR 2.0 and LineViewer_32_1.1.1.102
or higher versions
Includes an internal inclinometer for tilt measurements

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Temperature operation range: -40 to +60°C
GSB LED provides information about unit state, errors and charging
process, useful during deployment and pick-up operations
Charging the internal battery requires as little as one hour for every 10
days of deployment
Light weight 1 Kg (1 or 3 channels models)
2. – GSB data downloader and charger
The GSB racks provide an interface to download data and charge the internal
battery. The racks are 12 slots modular. There are two types of racks available to
be used with the GSBs:
•Portable for small crew operation or to be used in remote sites.
•GSB trailer for normal operations.
2.1 – Portable chargers and data retrieval
The portable charger can charge internal battery and retrieve seismic data from up
to 24 GSBs simultaneously.

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2.2 – GSB trailer
The GSB trailer includes several modules according to the customer’s request,
each module can charge the internal battery and retrieve seismic data from up to
60 GSBs simultaneously. A trailer with 8 modules (480 slots) can charge
approximately 2000 GSBs per days.
Vertical racks can also be installed in containers or any warehouse.
3. – GSB operational modes
The operational modes for the GSB are
•Record mode. Recording seismic data

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•Sleep mode. GSB is on, but it does not record seismic data (to reduce power
consumption)
•Disabled mode. GSB had not been activated to start recording data
•Search lost device mode. To improve the GSP position accuracy and
display a SOS pattern in the LED
•Powered off. All GSB circuitry is turned off. It is set when devices are
programmed to storage or shipping mode
3.1 – Record mode
This is the normal operation mode in the field when the GSBs are recording
seismic data. To be in this mode, the desired recording hours should be
programmed using parameters set in GeoReaper.
To enter into record mode, the GSBs must be deployed following the sequence
explained in section 4.1.

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3.2 – Sleep mode
In this mode, the GSBs are not recording seismic data, but the units still have
some basic circuitry active, including the internal radio. The GSBs are in this
mode when they are not inside the record hours window time programmed by
GeoReaper.
3.3 – Disabled mode
The GSBs are not recording data, but they are not in sleep mode. They are in this
mode after one of the following circumstances:
•The GSB was removed from the rack, and record mode had not been
activated.
•The GSB was commanded to go to disable mode immediately before the
unit was picked up from the spread. The sequence is explained in section
4.2.
3.4 – Search lost device mode
In this mode, the GSB searches for GPS for 15 minutes to get an accurate position
while showing a SOS LED pattern. It helps to improve its location if the device is
recording or to find a disabled device (lost in the field). To put a device in this
mode, the user should use the LHR+LHV combo to perform the “Find Lost
Device” operation. If you are searching for a lost GSB that has not been deployed
yet, you need to use the scripted channel -1. The devices are programmed to use a
different channel at this time to avoid getting QC data while they are being
transported to the field location.
3.5 – Powered off
In this mode, all GSB circuitry is turned off. It is programmed under the
GeoReaper command, and it is used when the units are getting ready to be
shipped to another location or are to be stored during longer period of times. It
returns to any functional mode after it is placed in the rack or connected to an
external Geospace battery.

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The GSB LED flashes 5 times per second while they are in the rack. Once they
are removed from the rack (or the rack is powered off), the LED flashes on solid
for 5 seconds and then turns off.
4– Field operation instructions
When the GSBs are removed from the rack, they immediately go to disabled mode
(radio channel for communication is programmed to channel -1). In this mode, the
GSB LED shows two quick flashes every 10 seconds (see section 4.3 for detailed
LED flash codes descriptions).
4.1 – Deploying GSBs
To deploy GSBs (to start recording seismic data), follow the next steps:
A. Plant the sensor properly on the ground.

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B. Put the GSB in record mode:
a. Hold the GSB from the geophone side, and keep it as vertical as
possible (see notes at the end of this section).
b. Observe that the GSB LED goes to an intermediate state where the
LED flashes for one second on followed by one second off pattern.