Loma IQ3X Operating Instructions Manual page 76

Operating Instructions
Aluminium
In this option you can enter the aluminum test piece size in mm to be used for PV testing.
Leave the option value blank if this test piece should not be used as part of the PV test.
False Threshold
The false threshold value is used to detect when metal test pieces are larger in size than those
specified by the PV test.
If this threshold is exceeded at any time during a test it does not count towards a successful test.
All PV test samples must be passed correctly for the PV test to be successful.
To ensure the correct false threshold value is entered, note the signal values obtained whilst
passing all the test pieces used. The ideal false threshold value is the largest signal obtained plus
a small margin added for error.
If you are not sure what margin for error to apply, test with the next size up test pieces, note the
values obtained and then set the threshold about midway between the largest signal value from
the test pieces to be used and the largest signal value from the next size up.
Note that PVS test pieces are not recorded in the Contaminants Log or included
within the reject count.
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