24-bit Multichannel Digital Strong Motion Recorder
Model SMR-4000

The SMR4000-x is a rugged, ultra low power, high-performance, versatile 24-bit resolution modular multi-channel strong motion recording system. The modular design allows channels to be added in groups of four up to 12channels. The multi-channel units (8 to 12 channels) are suitable for large structure monitoring and include differential sensor inputs to allow long sensor runs in noisy building environments. Multiple sensor inputs are easily connected via twist lock Bendix style connections.

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

The proprietary Smart Time system, controlled by the DSP, maintains extremely accurate time with only occasional calls to the GPS receiver. Data sampling is precisely synchronized with the internal time so all channels have the exact number of samples within all time periods. Re-indexing of data is never required.

The power hungry components such as the PC, disk, and GPS operate on an extremely low duty cycle. 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 flash disk
  • Integrated display
  • Integrated keypad
  • Real time waveform display
  • 4 to 12 channels
  • Analog and digital alias filtering
Type: Differential or Single-Ended
Data Channels: 4 opt. up to 12 (5 virtual channels per physical channel
State-of-Health 4th Channel: Standard: 24-bit resolution
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 converter in 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 SMR-4000 Configuration The standard configuration includes 8 channels, 128Mb flash drive, single ended sensor input, and GPS antenna/receiver.
Channel Configuration

option -12CH,

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 Flash Drives option -xx (specify capacity, must turn power off to remove)
Internal Modem option -56IM
LAN option option -LAN
Sensor Options EA-120 FBA Accelerometer,
EA-140 Accelerometer,
R-1 Rotational Seismometer,
EP-105 Broadband
Supplies and Accessories External Battery pack w/ charger (specify voltage)
USB Flash card reader
Flash 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 >1W (4-channel)
Display Type: Backlit 320x200 graphic LCD 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
Hard Disk 1Gb flash disk
Disk/File Compatibility: Any PC
Temperature Range: -30 to +50C
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 Painted Steel, optional stainless steel
Waterproofing NEMA 6
Operating Temperature -30 to +50C (with opt HD heater)
Humidity 100% RH
Size (12ch) 10" L x 12 W "x 6" H
(250 x 300 x 150mm)
Weight ~5 kg
Power 2-pin Circular (MS)
Data Channels Twist lock circular connectors
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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