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How Do I Calibrate My TDR Meter?

Calibration

The FieldScout TDR is fully calibrated at the factory. Further calibration is not required, nor recommended. The meter has internal calibrations that will work for many soil types. Each meter will have a small difference in how it responds to identical soil conditions. This can be due to air being introduced while measuring, bent probes, loose probes, sensor drift or component tolerances. The meter allows for adjustments to the calibration to account for these differences.

Should the user prefer to perform the calibration, the following are required:

  1. A clean glass or plastic container. The container must be at least 4" (10cm) wide and 2" (5.08cm) longer than the length of the TDR rods.

  2. A sufficient volume of unused distilled or de-ionized water to fill the above container.
    Note: Well or municipal tap water cannot be substituted

Procedure:

  1. Pour all the distilled/de-ionized water into the container.
    Note: The water and container must be free of minerals and salts to calibrate properly

  2. From the Settings Menu, set the rod length to the correct length of the rods currently installed.

  3. From the Settings Menu, choose the Calibration option.

  4. Press the MENU|SELECT button to initiate the calibration process.  Follow the display messages.

  5. While keeping objects and personnel clear from the area; raise the meter so the rods are in the air. Press the MENU|SELECT button and wait until the meter indicates it is ready.

  6. Immerse the rods completely in the distilled/de-ionized water until the sensor base is in contact with the liquid. Keep the sensor base and rods centered in the container. Do not submerge the sensor base.

  7. Press the MENU|SELECT button and wait until the meter indicates it is ready. The meter will then show that the calibration is complete for that specific rod length. If more than one rod size is being used, a calibration operation must be done for each rod length used.