How to make your own grain calibration.
If you need to make a calibration scale for a particular crop that is not included in the meter, this can be
done as follows:
1. Turn on the meter by pressing ON/TEST.
2. When MEASURE appears press ON/TEST again.
3. Use the arrow keys ⇑ or ⇓ scroll through the crop options until Bit is displayed.
4. Fill the test cell with a sample of the desired crop for which you know the moisture content, grind
the sample and perform the test as described earlier.
5. Note down the value which appears in the display, eg. 03.65, and the temperature, eg. 19C, together
with the moisture content in the crop. Perform this process repeatedly using samples with different
levels of known moisture content until the calibration scale meets the range and requirements
needed. The more samples that are used the more accurate the calibration will be. Try always to use
samples at the same temperature.
6. Plot the values on a graph, either manually or using Excel, with moisture content on the y-axis and
Bit on the x-axis and draw a line or curve that best fits the points. The calibration is now completed
and moisture contents can now be read off the y-axis for any Bit value measured using subsequent
samples of the same crop in the meter.
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