.
The Measurement setup dialogue shown below appears. At the bottom of
the dialogue select the Enable inspection stage... check box. This pauses
the measurement after the background measurement and allows a trial
spray before measurement starts so pre-measurement checks can be per
-
formed. There’s no need to set up an output trigger so leave that check box
deselected.
.
Use the Duration box to specify how long the background measurement
will run for before moving to the next measurement stage.
Significant changes in the background may indicate spray deposition on the
optics during the measurement, reducing the accuracy of the results. To
check for these, select the Warn if background changes during
measurement check box. This makes two further options available:
Lower Detector Limit and Upper Detector Limit – set the range of
detectors that should be monitored as part of the background check.
Change (%) – sets the maximum allowable percentage change in the
average signal measured across the specified detector range which is
acceptable when carrying out the background check. If the background shift
between the beginning and end of the measurement is greater than this
percentage, a warning at the end of the measurement states that the optics
have possibly become contaminated by the spray.
.
The default set of alarms will suit most purposes; click the Alarms button
if required to review these. For full information on alarms, refer to Chapter
10. Click Next.
CHAPTER 5
Spraytec Page 5.9
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