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Portable Integrated Seismic Recorder & Accelerometer
Brand: Reftek Systems IncThe SMHR2 combines Reftek's latest generation of universal broadband seismic recorder, with the advanced high resolution, force-balance accelerometer, model 147.
Designed to facilitate installation, security, and maintenance in a single, secure enclosure optimized for early warning system installations.
The SMHR2 features a 32-bit A/D performance boost and boasts a large dynamic range. The enhanced dynamic range enables the SMHR2 to record very small vibrations from its integrated seismic sensor, providing detailed data for seismic analysis.
Features- >135 dB dynamic range for detailed event data & high quality scientific analysis
- Ultra low latency for Earthquake Early Warning Systems
- Built-in Seedlink server for robust data transmission
- Precise & accurate timing
- Low-noise, force balance accelerometer
- Sensitivity & offset stable
Specifications
Brand
Type
- 32-bit SAR A/D converters
Dynamic Range
- > 135 dB @ 100 sps
Input Channels
- 3
Gain Options
- Available with x1 or x2 gain
Input Full Scale
- Matched @ x1 gain
Input Impendance
- 26 Kohms, 0.002 uFd, differential @ x1
- 2 Mohms, 0.002 uFd, differential @ x64
Common Mode Rejection
- > 90 dB
Sample Rates
- 1000, 500, 250, 200, 125, 100, 50, 40, 20, 10, 5, 1 sps
Multiple Sample Rates
- Supported for rates in the group 1000, 200, 100, 50, 40, 20, 10, 5, 1
Sampling
- Simultaneous on all channels
FIR Filter
- 140 dB down in the stopband
Time Base Type
- GNSS Receiver with Internal Disciplined Oscillator
Accuracy with GNSS
- ± 10 μsec after validated 3-D Fix and Locked
Free-Running Accuracy
- 0.1 ppm over the temp. range of 0° C to 70° C
- 0.2 ppm from -30° C to 0° C
Alternate Time Sources
- PTP or NTP
Input Voltage
- 9-24 Vdc
Average Power (3 Channels, Accelerometer, No Communication, GNSS Duty Cycle)
- 2.4 Watts
Average Power (3 Channels, Accelerometer, with Communication, GNSS Duty Cycle)
- 2.7 Watts
Internal Battery
- 1.2 Ah, Lead Acid
Low Voltage Disconnect
- User-programmable. Additional hardware cutoff fixed at 9.0 Volts
Format
- Miniseed, MRF
Transmission
- SeedLink Server, RTP
Trigger Types
- Continuous, STA/LTA, Level, Vote, Time, External and Cros
Internal Capacity
- 8 Gb internal Flash memory data buffer, USB
Ethernet
- 10/100 Base-T, TCP/IP, UDP/IP, FTP, RTP DHCP, Static, Link-Local
WiFi
- Access-point mode for local command & control
WebUI
- Accessible via WiFi or Ethernet
Screen
- 2.8” TFT
Full-Scale Output
- ± 4 g, (Optional ± 2 g)
Self-Noise
- < 1 μm/s/s
Linearity
- < 0.1 %
Frequency Response
- DC - 250 Hz (± 3 dB)
Damping
- 0.7
Self-test Response
- Logic level input will produce consistent g level output
Lightning Protection
- Built-in surge protection
Cross Axis Sensitivity
- < 1 %
Hysteresis
- < 0.1 % of Full Scale
Thermal Drift
- ≤ 600 μg/°C
- Earthquake Early Warning
- Local and regional broadband seismic networks
- Structural health monitoring