Introduction
SEIS-UK maintains 2 compact dynamite firing units and a 24 channel Geode system.
Specification
24 channel Geode
The Geode is provided with a toughbook with multi-geode control software, power leads and an ethernet cable to join geodes together. However, although SEIS-UK do not supply geophones or geophone cables, they can be rented GEOMATRIX. A link to the GEOMATRIX website is given in the links section.
| Total number |
1 |
| Dynamic Range |
144 dB (system), 110 dB (instantaneous, measured) at 2
ms, 24 dB. |
| Bandwidth |
1.75 Hz to 20 kHz. Low corner frequency option available. |
| Preamplifier Gains |
Software selectable between 24 or 36 dB. Can be
jumpered to allow software selection of 12 or 24 dB or jumpered to 0 dB2 |
| Sample Interval |
1.75 Hz to 20 kHz. Low corner frequency option available. |
| Sample Interval |
0.02, 0.03125, 0.0625, 0.125, 0.25, 0.5, 1.0, 2.0, 4.0,
8.0, 16.0 ms. |
| Data Transmission: |
Uses Ethernet transmission standard over CAT 5
copper or multimode fiber-optic cable. Distance between boxes: CAT 5
cable up to 250m; fiber-optic cable up to 1500m. |
| Data Storage |
Stores data locally in SEG-2 on laptop/PC media. Drivers
available for tape/disk storage in SEG2/D/Y2. |
| Power |
Requires 12V external battery. Uses 0.65 W/channel during
acquisition, sleep mode reduces power consumption by 70% while in standby. |
| Environmental |
-30 to 70 degrees C. Waterproof and submersible. Withstands
a 1 m drop onto concrete on 6 sides and 8 corners |
| Dimensions |
Length 25.4cm x Width 30.5cm x Diameter 17.75cm |
| Operating System: |
Windows 95/98/ME/NT4 |
GRB-2
The Group Recording Blasters (GRB-2) are available without any recoding system. For the source of the following information and for further details on the GRB-2 please refer to Macha International Inc.
| Total number |
2 |
| Output voltage |
200 V (with a 400V option) |
| Firing energy |
1 joule |
| Firing capacity |
Maximum firing circuit resistance: 40 Ohms |
| Uphole output |
Analogue signal, un-buffered and buffered |
| Inputs |
Contact closure, opto-isolator current and TTL signal |
| Operating temperatures |
-30 C to 50 C (battery dependent) |
| Power requirements |
Four (4) 9V transistor batteries |
| Front panel display |
- Uphole time 0 to 200 milliseconds
- Cap line resistance 0 to 20 Ohms
- Uphole line resistance 0 to 2000 Ohms
|
| Size |
- Height; 3"
- Width; 4"
- Length; 12"
|
Shipping information
The GRB-2(s) are shipped in lightweight, water-tight, padded PELI cases.
| Instrument box dimensions |
220mm x 520mm x 430mm |
| Instrument box volume |
0.049 cubic meters |
| Instrument box weight (with instrument inside) |
9.8kg |
Links
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