31
In this mode the display will show the VDI graph and above it the individually
selected VDI number. Next to the VDI number will be a box that will indicate whether this
specific number will be accepted or rejected (discriminated). An empty box indicates this
VDI number has not been included ( rejected) and will be discriminated. A check appears in
the box if this VDI number has been included (accepted) and will not be discriminated.
Use the + and – buttons to select the VDI numbers and the up or down arrows to check or
uncheck the selected VDI numbers.
To select an entire block of VDI numbers to accept or reject at once perform the
following. Select the first VDI number to be accepted/rejected. Press the Fn button (HOLD
will appear on screen). Now press either one of the up or down keys to choose the status of
the selected VDI group (either accepted or rejected). Now, using the + or – key, scroll to
the last VDI number in your selected group. When complete press the Fn button to end the
HOLD function.( Fig. 32).
Card
Hold
+62
[ДИСКР] - The Menu
Fig. 32
For example, if you wish to reject VDI numbers -90 to -21 while acc20 to +90
perform the following:
1. Enter the discrimination Map.
2. Set the currently selected VDI number to -90 by using the + or - buttons.
3. Use the up or down arrow to make sure the box is NOT checked.
4. Press the button [
Fn
] to enable HOLD
5. Press the button [
+
] and scroll to VDI number -20. (All VDI between -90 and -20 are
now rejected)
6. Press either the up or down arrow to change the status of the check mark.
7. Press the button [
+
] and scroll to number
VDI+90
.
Now all VDI from -20 to +90 have been accepted while -90 to -21 have been
rejected. You can scroll down through the numbers quickly by h or – to
verify.
CAUTION.
Remember when programming the maps do not make discrimination
rejected sectors too narrow (less than 10 VDI ) because, due to the influence of soil,
salinity and other external factors, VDI indexes of objects can deviate in either direction
relative to the received air test value thus increasing the probability of missing the object
you want.
