22-bit Digital Seismic Recorder
Model DAS-6102-x

The DAS-6102 is a portable, rugged, ultra low power, high-performance, versatile 22-bit resolution digital seismic recording system

The standard system is configured for 4-channels. Optional configurations include configurations up to 32 channels. All channels operate synchronously up to 2,000 samples per second.

A standard 20Gb removable hard disk is included, with optional disk capacities to to 32Gb. Data is retrieved by removal of the PC compatible compact hard drive, or through dial up telephone access (internal modem optional), or via LAN (Ethernet card optional).

The DAS-6102 includes a GPS receiver and antenna and "Smart Timing" software, allowing the user to select the timing accuracy, which will automatically control and minimize the GPS cycling times. The integrated display and keyboard allows for easy setup in the field and real time viewing of up to 3 waveforms.

For large permanent installations, the DAS product line includes multi-channel PC based or rack mounted systems up to 32 channels (Models DAS-6102-PC or -I)

  • 22-bit high resolution
  • 112B dynamic range
  • operates in both trigger and continuous mode
  • Multiple trigger passband pre-filters
  • High accuracy GPS timing
  • Large PC compatible removable hard disk
  • Integrated display
  • Integrated keypad
  • Real time waveform display
  • 4 to 32 channels
  • Analog and digital alias filtering
Type: Differential or Single-Ended
Data Channels: 3 + 1; optional up to 32 channels. Fourth channel is used as state-of-health channel.
State-of-Health 4th Channel: Standard: 22-bit resolution, optional external connector
Gain: Software programmable: 1,2,4,8
Single Ended Input Range, Software programmable: 2.5 Optional Differential Input
Dynamic Range: >112 dB @ 200 sps
(rms to full scale)
Analog Anti-Aliasing Filter: >90 dB @ primary sampling rate
Input Impedance Data inputs: 2.5V - 1Mohm
Overvoltage Protection 40 V
Type: 22-bit delta-sigma converter in each channel (570 kHz)
Sampling Rates: 1, 10, 20, 40, 80, 100, 200, 500, 1000, 2000 sps
Digital Filter Built-in DSP-based digital filter
Phase Linear within the passband
Type: True Real Time PLL controlled, GPS-referenced
Maximum Accuracy : <1msec, (Software Selectable)
HOW TO ORDER Crystal Oscillator Standard: 25ppm; Optional TCXO 1 ppm/year
Basic DAS-6102 Configuration The standard configuration includes 3 channels with internal 1 (mux) channel for state of health monitoring/recording, 10Gb hard drive, single ended sensor input, and GPS antenna/receiver.
Channel Configuration

option -8CH, -12CH, -16CH, -20CH, -24CH, -32CH

4th Channel External Connector (Aux) option -AX
Differential Sensor Input Configuration option -DI
Full VGA Display option -FD
Full PC Keyboard (miniature) option -KB
Microsoft Windows O/S option -MSW (requires option -FD and -KB)
Removable 12Gb, 20Gb, or 30Gb Drives option -xxGb (specify capacity, must turn power off to remove)
Internal Modem option -56IM
LAN option option -LAN
Sensor Options EP-300 Broadband,
EP-105 Broadband,
SP-400 Medium Period Seismometer,
R-1 Rotational Seismometer
Supplies and Accessories External Battery pack w/ charger
PC removable disk frame
Hard Disk (specify capacity)
General Spares GPS antenna/receiver
Set of spare boards
Battery (specify capacity)

S Printer Friendly Format For Specifications

GPS Duty Cycle : Once every 18 hrs to achieve <1msec accuracy, (Software Selectable)
Type: STA/LTA, Level, up to 5 independent detectors in frequency domain
Trigger Pre-filter Up to 5 trigger passbands
Pre-event data buffer Up to 90 seconds (@100 sps)
Post-event buffer User configured - no limitations
Trigger channels May be controlled by one, several or all 5 detectors associated with any physical or virtual acquisition channel
Calibration 5V square wave (others optional)
Calibration Duration User selectable
Voltage: 7 - 16 Vdc
Overvoltage protection: 60 V
Power consumption 4 ch ~5W, 100sps, (Display off, PC and GPS cycled)
Display Type: Backlit 320x200 graphic LCD display, opt. TFT color 640x480 (1/4) VGA
Keypad: 12 (numerical + function) keys
Full PC keyboard Optional
User Control: Menu-driven; state-of-health messaging
Data display: Up to 3 channels simultaneously in real time
Remote PC: RS232 com2 port
Hard Disk 10Gb standard, optional to 32Gb
Disk/File Compatibility: Any PC
Temperature Range: -10 to +50C (built-in automatic heater for optional hard disk)
Data Formats: Mini-SEED w/Steim-2 compression up to x6 CSS 3.0: long integer; separate data description in ASCII
Dial-up Telephone Line Access RS232 com2 port; optional internal modem; Automatic PC dial up communication software included
Ethernet Optional LAN card
Housing Reinforced plastic
Waterproofing Submersible to 1m depth
Operating Temperature -10 to +50C
Humidity 100% RH
Size L12"xW10"xD6"
Weight 9.5lb typ (4 ch w/ sensor)
Power 2-pin Circular (MS)
Data 10-pin Circular (MS)
LAN or serial port 10-pin Circular (MS), or DB9
GPS 6-pin Circular (MS)
To PC Keyboard PS/2 Mini-DIN
To external PC RS232 (DB9)

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