Selecting The Quadrature Noise-Reduction Filter - Thermo Scientific APEX 100 User Manual

Inactivating the PNR Filter
This is not recommended. However, if you need to inactivate the PNR filter, do the
following.
1) Make sure the PNR filter menu is highlighted.
2) Press the Go button and the check mark changes to an X.
3) Press the Back button to exit the menu. The PNR filter is now inactivated.

Selecting the Quadrature Noise-Reduction Filter

The default setting for the quadrature noise-reduction (QNR) filter is off, as indicated by
the X in the QNR menu below. The QNR filter is often used when testing wet products,
where it reduces 1) the background noise, and 2) the number of uncontaminated units
of product that are erroneously rejected as contaminated due to vibration. Occasionally
the QNR filter is used when testing dry products, where it lowers the detect level and
increases the ability of the search head to detect metals. The QNR filter can be used in
conjunction with the CLX and PNR filters, if needed.
Quadrature Noise Reduction
Activating the QNR Filter
1) Make sure the QNR filter menu is highlighted, as shown above.
2) Press the Go button and the X changes to a check mark.
Quadrature Noise Reduction
3) Press the Back button to exit the menu. The QNR filter is now on.
Thermo Scientific APEX User's Guide Page 159