Locking The Detect Level; Calibrating The X And R Noise Thresholds - Thermo Scientific APEX 100 User Manual

Locking the Detect Level

This function locks the current detect-level setting so that it cannot be changed—for
example by running the auto-calibration function. In the screen below, the detect-level
setting (40) is not currently locked.
To lock the detect-level setting, press the Go button and the X changes to a check
mark—indicating the detect-level setting is now locked (in our example at 40).
Detection Level Lock

Calibrating the X and R Noise Thresholds

This function allows you to calibrate the X and R noise thresholds for background noise,
and is typically used in applications where vibration from the conveyor creates
background noise that the detector may interpret as a contaminant passing through the
search head. Vibration—it is important to note—usually shows up in the X threshold
(where it increases the value).
Calibrate Noise Thresholds
Calibrating the X and R Thresholds for Background Noise
To calibrate the X and R thresholds for background noise in a conveyor application, do
the following.
1) Turn the conveyor on (making sure no product, test samples, and so on are on the
conveyor or near the search head).
2) Make sure the "Calibrate Noise Thresholds" function is highlighted, as shown above.
3) Press the Go button and a monitor screen appears.
4) Wait for the calibration function to finish. (The detector will close the menu and
assign values for the X and R noise thresholds.)
Page 166 Thermo Scientific APEX User's Guide