Michell Instruments QMA401, Руководство пользователя

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QMA401 User’s Manual
24 97450 Issue 2, March 2018
OPERATION
If Analog O/P Hold is turned off then the ‘Hold Cycles’ selection box is hidden, as shown
below:
Figure 18 Field Calibration Screen 2
Hold Cycles – If Analog O/P Hold is selected, the user can select for how many cycles
after the calibration the last measured value is held for. This is done using the onscreen
keypad which is opened.
If an external calibration source is selected the user must enter the external reference
moisture in the Ext Ref (ppm) setting.
If an internal calibration source is selected then the ‘Ext Ref’ selection box is hidden (as
shown above). If an external calibration is selected then the calibration mode is forced
to manual i.e. an automatic calibration cannot be carried out if the external calibration
source is active. The ‘Cal Method’ selection box is also hidden, as shown below:
Figure 19 Field Calibration Screen 3
If an automatic calibration is selected then calibration will begin on the time selected
using the interval and hour settings. This is done using the onscreen keypad which is
opened.