2 calibration equation, 3 description of pcdmm functions, 1 menus – Campbell Scientific DMM600 Duff Moisture Meter User Manual
Page 18: Calibration equation, Description of pcdmm functions, Menus, 2. pcdmm, User, Interface display
DMM600 Duff Moisture Meter
FIGURE 7-2. PCDMM user interface display
7.5.2 Calibration Equation
The frequency output of the DMM600 is converted to water content using a
calibration equation. The response of the DMM600 to changing water content
is best described with a quadratic calibration equation. A factory calibration is
part of the DMM600 operating system and will always be displayed.
The factory calibration to convert frequency (MHz) to volumetric water
content is:
VolumetricWater Content
freq
freq
=
+
−
5 288 5 905
0142
2
.
.
*
.
*
User derived calibrations are easily loaded to the DMM600 using PCDMM.
The coefficients from the calibrations are entered into the appropriate box then
Send Calibration button is used to transfer the values to the DMM600.
7.5.3 Description of PCDMM Functions
This information is also available from the HELP menu.
7.5.3.1 Menus
Options/Comx selects computer serial communications port x.
Options/Disconnect terminates serial communications.
Options/Exit terminates program PCDMM.
12
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