The EDL, made by EARTH DATA (U.K.), is a digital recording system for stand-alone use.
Adaptor cables are available for all types of broadband seismometers belonging to the DEPAS pool.
Digitiser SetUp and Control can be done via serial link (manufacturer software). Additionally, a GFZ-GIPP made Recorder SetUp and Status View Software (including Digitiser Parameters) is available for the use of WIN/DOS and PocketPC based field palmtops. The GFZ User Software also supports Group SetUp; and the Control functions, as Status View and Configuration File Download, are performed as one-key commands.
Data Retrieval is supported by GFZ User Software and by a set of Hard Disk Reading Adaptors. The adaptors convert IDE into SCSI for direct access to the hard disk from any LINUX PC.
A limited set of adaptors converts IDE for USB or FireWire connection. Have also an extended look at the recorder (154 kByte) and at the GFZ type casing (149 kByte).
EarthData PR6-24 Recorder, 63 units
35 Units 3 Channels (111 Units with USB connector)
28 Units 6 Channels (28 Units with USB connector)
Hard Disk, 372 units
45 Units 10.0 GByte
4 Units 20.0 GByte
33 Units 30.0 GByte
340 Units 40.0 GByte
Parameters - Input Signal
Channels 3 or 6, plus 4 auxiliary
Preamplification 1; 10 ; 0.4 (85 units only)
Clipping 1; 10 ; 0.4 (85 units only)
Digital Signal
Sampling Rate 1; 2; 4; 5; 10; 20; 25; 40; 50; 75; 100, 120; 125; 150; 200; 250; 300; 375; 500; 600; 750; 1000 sps; 3000 sps (reduced dynamic range)
Resolution MiniSEED, ASCII: 1 microVolt/digit ( @ PreAmp = 1 ) digitiser output: 3.9 nanoVolt/digit
Dynamic Range 140 dB @ 100 sps 145 dB @ 25 sps (4 Byte digitiser output 150 dB) 96 dB @ 3000 sps (upper 2 Bytes only)
Time Keeping
Clock 1*10e-6 (TCXO)
Synchronisation GPS, continuously or cycled
Digitiser Buffer
RAM (volatile) 16 MByte
Format 4 Byte
Data Storage
Hard Disk 10.0 GByte (Data Partition 8.8 GByte, FAT 32) 30.0 GByte (Data Partition 27.3 GByte, FAT 32), 40.0 GByte (Data Partition 36.6 GByte, FAT 32)
Storage Format ASCII, upper 3 Bytes of digitiser output MiniSEED, compressed (Steim-1), based on, upper 3 Bytes 'legacy', PR2400 multiplex (equivalent to digitiser output)
Physical Parameter
Power Consumption < 1.8 Watts (GPS cycled) to 2 Watts (GPS conti) @ 3*100 sps
Weight Recorder, including disk: 4.3 kg (new series 3.75 kg
Operating Temperatures Recorder and Disk: -20 to +65 °C
Connectors (Front Panel, Hard Disk)
The SUMMIT, made by Deutsche Montan Technologie (DMT), is a multi-channel digital recording system. The system consists of single-channel recorders (Remote Units, RU) connected along a two-wire Data Link, and a Central Unit (PC-board or workstation). Sensor adaptors are available for geophone chains (PE-7 connector) and for the S_ MARK L-4C-3D geophone.
The information is stored first in the Remote Unit on nonvolatile RAM, and then transmitted to the Central Unit on request.
Remote Unit ID Numbers are set by a SUMMIT handheld terminal. Parameter SetUp, Line Check, and Data Retrieval are controlled from the Central Unit.
Long Data links require Repeater Units (RP) every 250 m. All Repeater Units also implement the function of Line Distributor Units.
An 'intelligent RP' is currently tested. It will make available the same remote control functions as given for the Remote Units (RU).
Pool Contents
Remote Units 96 Units: 2 Channels, 48 kSample/Channel, external power supply
Repeater and Distributor Units, 80 Units: Repeater (for max. cable length of 250 m)
Data Link Cable 40 drums: 250 m, built-in line terminator at each end 10 drums: 120 to 230 m, spare cable
Parameters
Input Signal
Channels 2
Clipping 4 Vpp @ low preamp (0 dB)
Digital Signal
Sample Interval 1/32; 1/16; 1/8; 1/4; 1/2; 1; 2; 4; 8 ms
Format 4 Byte, SEG2
Digitizer 24-bit Delta-Sigma ADC
Preamplifier 1 or 8 (0 dB resp. 18 dB)
Time Keeping
Clock 1*10e-6
Synchronisation Record Start pulse to all RUs by Central Unit
Data Storage
RAM 48 kSample/channel
Physical Parameters
Battery Power Usage (external 12V/12Ah battery)
Remote Units 300 h (stand-by); 220 h (20% acquisition); 150 h (max. acquisition, e.g. vibroseis)
Repeater 200 h (stand-by); 100 h (continuous line check or data transfer)
Weight
Recorder/Repeater 2 kg
Battery 12V/12Ah 4 kg
Cable Drum 250 m 9 kg
Operating Temperatures
Recorder/Repeater -30 to +80 °C