Sensor Information

Sensors

The sensors that were monitored during the modal test consisted of

  • 74 Accelerometers
    • 30 PCB 336C31 (1 V/G, resolution 1 mG)
    • 6 PCB 356A18 Triax (@3 channels, 1 V/G, res. 60 microG)
    • 3 PCB XT352M85 (1 V/G, res. 70 microG)
    • 4 PCB 393M25 (1 V/G, res. 1 microG)
    • 2 PCB 333A50 (1 V/G, res. 80 microG)
    • 9 PCB U393C/393C/393B (1 V/G, res. 100 microG)
    • 5 PCB 308B02 (1 V/G, res. 500 microG)
    • 3 PCB 393B31 (10 V/G, res. 1 microG)
  • 1 Force input (Roving Impact Hammer)
    • PCB 288ED01 (100mV/lb)
  • Accelerometer layout image
  • Exact sensitivities are given in the MACL report (PDF format)
The sensors that were monitored during the operating (wind excitation) tests were

  • 62 Accelerometers
    • 3 PCB356A18 triaxes and 3 PCB336C31 (1 triax) removed
      (as shown in the figure)
  • 24 Pressure Transducers on the Primary
  • 15 Channels of wind data (5 sensors, each X, Y, Z).
    • Locations
      • Edge of primary (+X, -X, -Y)
        'X' is the elevation axis
        '+X' is to the right looking at M1
        '-Y' is 'down' when the telescope looks to horizon
      • M2
      • Top of dome
    • Data Sheet (PDF format)