20 Hz Recording, Sediment Profiling

20 Hz Recording, Sediment Profiling

The SediMeter gets burst sampling at 20 Hz, long accelerometer recordings at 400 Hz, and a brand new sediment profiling functionality.

We are pleased to announce the following new features in the 4th generation SediMeters (firmware rev. 2 and software ver. 6):

  • Burst sampling at 0.125 Hz to 20 Hz, up to 255 records per burst
  • Up to 5k 3D-accelerometer samples at rates from 10 Hz to 400 Hz
  • Vibration and free-fall triggered sampling
  • New flexible modes
    • No internal sampling
    • Only timed internal sampling, with or without bursts
    • Only triggered internal sampling, with or without bursts
    • Both timed and triggered internal sampling
      • Bursts in neither
      • Bursts in both
      • Bursts only in timed measurements
      • Bursts only in triggered measurements
  • The accelerometer can be set up using the free software
    • Free-fall threshold and duration
    • Vibration threshold and duration
    • 10 bit/20 samples or 8 bit/30 samples per record
    • ±2, ±4, ±8, or ±16 g range
    • 1, 10, 25, 50, 100, 200, or 400 Hz rate
    • Convenient presets for SediMeter™, SediSond™, and both
  • Flexible choices for displaying OBS turbidity array data in the software
    • A clean time series
    • A single free-fall burst sample
    • A single vibration burst sample
  • More control over displaying the accelerometer data
    • Record by record, or burst by burst
    • Ability to listen to the accelerometer data in mono or stereo
  • A new window for displaying interpreted SediSond™ free-fall data
    • Acceleration, velocity and turbidity as a function of vertical position

All this is included in the SediMeter™ SM4 rev. 2 for both SM4 and SM4P instruments, but the SediSond™ mode is only usable in the SM4P due to the mechanical construction. Reference: Erlingsson, U., 2024: Electronic Sediment Profiler: SediSond™. http://dx.doi.org/10.13140/RG.2.2.36757.13284

The SediMeter™ SM4P configured as a SediSond™ for sediment profiling.