SEDIS V + VI

SEDIS V is a lightweight seismic recorder offering various options
for seismic surveys, namely Wide Aperture Reflection / Refraction Seismic Profiling (WARRP) investigations, seismicity and microearthquake studies, and conventional reflection seismic surveys.
The instrument can be used offshore (integrated in an Ocean-Bottom Seismigraph (OBS)) or as a stand-alone seismic unit onshore.

It is a perfect tool to obtain accurate seismic data to evaluate reliable 2- and 3-dimensional models of velocity distribution and reflectivities. Both marine and land versions record up to six channels (hydrophones and/or geo-phones) on a flash memory of 16 GByte inside the instrument, allowing up to 28 of continuous data acquisition (see specification).

Power is provided by alkaline D-size batteries, solar panels and batteries. Activation of the instrument and selection of recording parameters can be programmed with any IBM compatible PC. Data compression of minimum 2.5 x is also possible and event detection and event storage is included in the software and can be activated if required .

Software for quality control and instrument test functions is included.
It is possible to record continuously or at prefixed time windows.
Precise sampling rates (selectable from 1 to 16 ms) are guaranteed by a stabilised quartz.

SEDIS VI is a lightweight seismic recorder offering various options
for seismic surveys, namely Wide Aperture Reflection / Refraction Seismic Profiling (WARRP) investigations, seismicity and microearthquake studies, and conventional reflection seismic surveys.
The instrument can be used offshore (integrated in an Ocean-Bottom Seismigraph (OBS)) or as a stand-alone seismic unit onshore.

It is a perfect tool to obtain accurate seismic data to evaluate reliable 2- and 3-dimensional models of velocity distribution and reflectivities. Both marine and land versions record up to four channels (hydrophones and/or geo-phones) on a flash memory of 32 GByte inside the instrument, allowing long time continuous data acquisition (see specification).

Power is provided by alkaline or lithium D-size batteries or solar panels. Activation of the instrument and selection of recording parameters can be programmed with any IBM compatible PC.

Software for quality control and instrument test functions is included.
It is possible to record continuously or at prefixed time windows.
Precise sampling rates (selectable from 1 to 16 ms) are guaranteed by a stabilised quartz.

Technical specifications SEDIS V:

Analogue inputs:	6 differential channels
Input signal range:	+/- 4.5 V
Over voltage protection:	+ /- 40 V
A/D converter:	High performance Delta-Sigma CS 5321 on each channel
Digital filters:	CS 5322, cut-off frequencies: 500 Hz, 250 Hz,125 Hz, 62.5 Hz
Dynamic range:	120 dB at 250Hz sample rate
Clock oscillator:	OCXO, 0.01 PPM, 0-50 C
Main processor:	200MHz ARM9 CPU
Onboard memory:	32 Mbytes SDRAM
Data storage interface:	SD Card
Comunication Interfaces:	LAN, Bluetooth, Serials Port, USB Ports,
Power supply:	voltage: 9-36 VDC
Power consumption:	1.8 W for 4 channels, 1.2 W for standby
Data storage:	8 GByte SD Flash Memory Card, 2x 8 GByte CF data storage
Operating System:	Linux (R)
Size:	10.5 x 12.5 x 20 cm3
Weight:	1.6 kg

Technical specifications SEDIS VI:

Data acquisition:
Analogue inputs	4 differential channels
Supported sampling intervals*	0,25; 0,5;1ms … 1000 ms
Power consumption	~1.65 W @ 15 MHz ~ 1.85 W @ 166 MHz
Size and weight	133 * 105 * 85 mm, 870 g
ADC board specifications:
A/D converter	Cirrus Logic CS5371A
Digital filter	Cirrus Logic CS5376A
Amplifiers	2x CS3301 Geophone Amplifier, 2x CS3302 Hydrophone Amplifier
GPS Unit	Trimble embedded GPS receiver SveeSix-CM3
	with power-off control
Clock oscillator	Mxa 37/8, accuracy 1x10-8
Built-in sensors	1 x Compass Module, 1 x Battery Level, Sensor, 1 x Temperature Sensor
Embedded Linux PC specifications:
Main processor	200 MHz ARM9 with scalable working freq
Working modes	Data acqusition @ 15 Mhz, Data backup @ 166 Mhz
Data storage interface	SDHC Card USB-Stick, SCSI
Power supply	Voltage: 9-36 VDC
Data storage	32 Gb SDHC Card, 2x USB-Stick of 64Gb each
Operating temperature	-40 C to +70 C
* For 1 msec sampling rate interval only 3 channels can be used