24-bit Strong Motion Accelerograph

Model SMR-4000-4A

The eentec SMR4000 is a portable, rugged, ultra low power, high-performance, versatile 24-bit resolution accelerograph.

The standard 4-channel (optional 8-channel) unit contains an optional internal triaxial 2g EA-120 low noise force balance accelerometer package. An ultra low noise accelerometer package (Model EA-120).

The hinged front panel allows for easy adjusting and leveling of the optional accelerometer package after the unit is installed. If required, an accelerometer adjustment board option can be included to further fine-tune the accelerometer's zero bias.

A 1Gb compact flash card for data storage is standard. Data is retrieved by removal of the PC compatible compact flash card, or through dial up telephone access (internal modem optional), or via LAN (Ethernet card optional).

The SMR-4000 includes GPS receiver and antenna and "Smart Timing" software, allowing the user to select the timing accuracy, which will automatically control the GPS cycling. 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 SMR line includes multi-channel systems up to 24 channels (Model SMR-4000X)

  • 24-bit high resolution
  • 132B dynamic range operates in both trigger and continuous mode
  • Multiple trigger passband pre-filters
  • High accuracy GPS timing
  • Large PC compatible compact flash card
  • Low power
  • 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 channels. Internal fourth channel is used as state-of-health channel, and 5 virtual channels for each,physical channel
State-of-Health Standard: 24-bit resolution, optional external connector
Gain: Software programmable: 1,2,4,8,16,32,64
Single Ended Input Range, Software programmable: 2.5, 10 V
opt. Differential Input
Dynamic Range: >132 dB @ 100 sps (1.6 bits noise)
(rms to full scale)
Analog Anti-Aliasing Filter: >100 dB @ primary sampling rate
Input Impedance Data inputs: 2.5V - 1Mohm; 10 - 26kohm State-of-health input: 1Mohm
Overvoltage Protection 40 V
Type: 24-bit delta-sigma converter in each channel
Sampling Rates: 0.1, 1, 10, 20, 40, 80, 100, 200, 500, 1000, 2000 4000 sps
Digital Filter (@ output Nyquist): >130 dB @ 200 sps
(FIR or optional IIR)
Phase Linear within the passband
Static RAM Buffer: Standard: 4MB expandable to 16MB
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 SMR-4000-4A Configuration The standard configuration includes 3 channels with internal 1 channel for state of health monitoring, 1Gb compact flash card, 4Mb internal RAM buffer, and GPS antenna/receiver. Internal EA-120, +/-2 g accelerometers, single ended sensor
8 Channel Configuration option -8CH
4th Channel External Connector (Aux) option -AX
Differential Sensor Input Configuration option -DI
16 Mb RAM Buffer option -16RB
Full VGA Display option -FD
Full PC Keyboard (miniature) option -KB
Microsoft Windows O/S option -MSW (requires option -FD and -KB)
Removable Disk option -xxGb (specify capacity, must turn power off to remove)
Internal Modem option -56IM
LAN option option -LAN
Sensor Options

R-1 Rotational Seismometer (requires 8 channel option -8CH)

EA-140 Force Balanced Accelerometer
Supplies and Accessories External Battery pack w/ charger (specify voltage)
USB compact flash frame (laptop or PC)
Compact Flash 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 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 4 ch ~1W, 100sps, (Display off, PC and GPS cycled)
Display Type: 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
Flash Disk 512 Mb compact flash card optional 1Gb
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 Painted Steel, optional stainless steel
Waterproofing Submersible to 1m depth
Operating Temperature -10 to +50C
Humidity 100% RH
Size L10xW8xD6"
Weight 8 lb typ
Power 2-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)
EA-140 (optional)
Full Scale Ranges:
+/- 2 g standard, 0.5 g, 5 g or adjustable optional

Full Scale Output Voltage:
+/- 10V for + 12 V input standard, +/- 2V opt
Natural Frequency:
50 Hz minimum
Noise per Root Hz: <1 V 0.4 V
Dynamic Range: 135 dB @ +/- 10V 148 dB @ + 10V
Resolution at + 10 V Output: 0.4 g @ 1g
0.8 g @ 2g
0.1g @ 1g
0.2 g @ 2g
Broadband RMS Noise: 25 V, DC to 50 Hz 5 V, DC to 50 Hz
Broadband Dynamic Range: 120 dB @ +/- 10V 145 dB @ + 10V
Zero G Bias:
+/- 0.01g (optional adjustable)
+/- 1% over temperature range
Cross Axis Sensitivity:
0.02 g/g (0.005 g/g option )
Frequency Response +/- 3 dB:
DC to 50 Hz standard
(25Hz, 100Hz and 200Hz optional)
Nominally 70% critical
Zero Output Temp Effect:
Less than 5 mg over range (others optional)
Scale Factor Temp. Effect: 0.05% / deg C 0.02% / deg C
Self Test
Voltage applied on self test input produces predictable output
Level Adjustment
Accelerometers mounted on an internal, easy to access plate for leveling after installation
Zero Bias Adjustment
Optional electronic module for user adjustable zero bias
Full Scale Adjustment
Optional electronic module for selecting full scale range (0.25g to 2g)
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