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BR3 - mobile seismic station

BR3 device is based on one-chip-microcontroller PIC. Using 4-input 16-bit A/D converter is digitalized signal from active or passive seismic sensor, geophone. Input can be sampled from 16 Hz do 1024 Hz and is stored onto a flash memory (MMC). Time is synchronized by GPS receiver - RMC and pulse per second. Captured data can be transfered into a computer by serial interface, RS232. It is an light, easy controlled and battery powered device suitable for short-time experiments such as quarry blasts, technological vibrations, refraction seismology and shallow seismics. Passive geophones - SM-6b (Sensor Netherland) are used a components of 3-D sensor. These sensors are called SM6-3D and one of them, the reference, is calibrated by the Czech Metrology Institution.


Technical specification
Analog inputs 3 (4)
Sampling frequency [Hz] 16, 32, 64, 128, 256, 512, 1024
Input range [V] ±2
Analog gain [-] 10×, 100× (jumpers inside)
Input range [mV] ±250
Relative potential [V] +2.5 (common pole)
A/D converter input range [V] 0..5)
A/D converter resolution 16-bit (65535 levels)
Trigger criterion level
Time synchronization GPS, RMC, pulse per second
Conectivity RS232
External power supply +12 V (10..14 V), current max. 400 mA
Operation time [hour] 20
Dimensions 190 × 190 × 80 mm


  • firmware (1.06T)
  • manual (czech)
  • datasheet (czech)
  • excel template (czech)
  • Screens

    Station Screen

    Amplitude Characteristics of SM6-3D Sensor

    Phase Characteristics of SM6-3D Sensor


  • Ing. Jaroslav Štrunc (
  • Ing. Milan Brož, CSc. (
  • Department of Seismotectonics, IRSM AS CR