Atmospheric corrections

The Monitoring software applies an atmospheric parts per million (PPM) correction that is applied to measured slope distances to correct for the effects of the earth's atmosphere. PPM is determined from observed pressure and temperature readings together with specific instrument constants.

The pressure and instrument constant is obtained directly from the instrument, but you must manually enter the temperature. To change these settings during monitoring, tap Pause and then tap Atmosphere. The Monitoring software automatically calculates the atmospheric correction based on the entered values.

 

  • If you prefer to use an alternative pressure reading, you can overwrite the barometric pressure from the instrument.

  • If you enter an atmospheric pressure and want to return to using the internal atmospheric pressure of the instrument, you must restart the Monitoring application.

The temperature and pressure (and therefore, atmospheric correction) is saved in the job with the measurements for every epoch. You can update the temperature at any time during monitoring—the corrections will apply to the next epoch.