FG5 Features and Specifications

Instrument Features

  • Automatic data acquisition and system controller (486 or better based PC)
  • Real-Time data processing and mass storage of all measurements
  • Environmental monitoring package including automatic logging of barometric pressure, ambient temperature and other system information.
  • On-line gravity corrections for tides, polar motion, atmosphericattraction
  • Superspring long period (30-60s) active isolation device
  • Patented vertical in-line interferometer (eliminates tilt coupling)
  • Built-in collimation optics for verticality alignment
  • Drag-free chamber surrounds the freely falling test mass to eliminate air drag
  • Automatic cart servo-controller
  • Frequency stabilized HeNe laser (Iodine stabilized HeNe laser option available for highest accuracy applications).
  • Rubidium atomic clock
  • Turbo-molecular vacuum pumping station
  • Ion-vacuum pump with battery backup power supply
  • Custom built shipping containers that are shock protected to withstand normal handling

General Specifications

  • Total shipping weight: 320kg in 6 containers
  • Total volume: 1.5 cu.m
  • Floor space requirement: 3 sq.m
  • Input voltage: 110-240 VAC (switchable), 50-60Hz
  • Nominal power requirement: 500W

Performance Specifications

  • Accuracy: 2 µGal (observed agreement between FG5 instruments)
  • Precision: 15 µGal/sqrt(Hz) at a quiet site [eg. About 1 µGal in 3.75 minutes or 0.1 µGal in 6.25 hours]
  • Operating dynamic range: World-Wide
  • Operating temperature range: 10 °C to 30 °C