24-bit Digital Seismic Recorder
Model DR-4000

The DR4000 is a rugged, ultra low power, high-performance, versatile 24-bit resolution seismic recorder. It is designed for the most demanding requirements in high performance seismic research.

This state-of-the art seismic recorder features 4 to 8 channels with high resolution ADC's on each channel that ensures no channel to channel skew, and a very low-power, high-performance DSP that controls the data acquisition, real-time digitization and filtration.

Data streams can be split into virtual streams, applying different event detectors with different trigger bandpass filters and sampling rates while simultaneously recording.

The powerful, full featured single-board PC controls the data transfer to disk and communication functions. It is active only when the SRAM is full, typically a few times a day. The proprietary Smart Time system, controlled by the DSP, maintains extremely accurate time with only occasional calls to the GPS receiver. The power hungry components such as the PC, disk, and GPS operate on an extremely low duty cycle, allowing the system to use less than Watt of power. The presence of a powerful PC, however, opens a wide range of options to the user. The industry standard PC/104 allows the use of many peripherals in a modular, stackable format, such as Ethernet cards, wireless LAN cards, satellite communication hardware, etc.

  • 24-bit high resolution
  • 132B dynamic range
  • operates in both trigger and continuous mode simultaneously
  • Multiple trigger passband pre-filters
  • High accuracy GPS timing
  • Large capacity PC compatible removable hard disk
  • Integrated display
  • Integrated keypad
  • Real time waveform display
  • 4 to 8 channels
  • Analog and digital alias filtering
Type: Differential or Single-Ended
Data Channels: 3 up to 8; (5 virtual channels for each physical)
State-of-Health 4th Channel: Standard: 24-bit resolution, internal
Gain: 1,2,4,8,16,32,64 programmable
Differential Input Signal Range: Programmable: 2.5, 20 V
Dynamic Range: >132 dB @ 100 sps (rms to FS)
Analog Anti-Aliasing Filter: >100 dB @ primary sampling rate
Input Impedance 2.5V - 1Mohm;
20 V - 26kohm
Overvoltage Protection 40 V
Type: 24-bit delta-sigma on each channel (320 kHz)
Sampling Rates: 0.1, 1, 10, 20, 40, 80, 100, 200, 500, 1000, 2000, 4000 sps
Digital Filter >130 dB @ 200 sps (FIR)
CMR @ 50, 60 Hz 120dB
Phase Linear within the passband
Type: True Real Time PLL controlled, GPS-referenced
Maximum Accuracy : <1 microsec (Software Selectable)
HOW TO ORDER Crystal Oscillator Standard: 25ppm; Optional TCXO 1 ppm/year
Basic DR-4000 Configuration The standard configuration includes 3 channels with internal 1 channel for state of health monitoring/recording, 1Gb Flash card, differential sensor input, and GPS antenna/receiver.
Channel Configuration

option -8CH,

4th Channel External Connector (Aux) option -AX
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 (specify voltage)
USB removable disk reader
Hard Disk (specify capacity)
General Spares GPS antenna/receiver
Set of spare boards
Battery (specify capacity)

S Printer Friendly Format For Specifications

Crystal Frequency Correction Resolution 0.016 ppm
GPS Duty Cycle : Once every 18 hrs to achieve <1msec accuracy, (Software Selectable)
Type: STA/LTA, up to 6 independent detectors in frequency domain
Trigger Pre-filter Up to 6 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 6 detectors associated with any physical or virtual acquisition channel
Calibration 5V square wave
Calibration Duration User selectable
Voltage: 6 - 16 Vdc
Overvoltage protection: 60 V
Power consumption ~0.75W (4 channels, 100 sps, cycled)
Display Type: Backlit VGA display.
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
Disk 1Gb Flash standard, optional 3Gb removable hard disk
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 -30 to +50C (with opt HD heater)
Humidity 100% RH
Size L10 x W 9 x D7"
(250 x 225 x 175mm)
Weight ~4.5 kg
Data Channels (3) and sensor power 10-pin Circular (MS3114)
Auxiliary Channels 10-pin Circular (MS3114) opt
LAN or serial port 10-pin Circular (MS), or DB9 opt
GPS 6-pin Circular (MS)
To PC Keyboard PS/2 Mini-DIN
To external PC RS232 (DB9)

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