Chapter 9 Advanced features
Page 9-12 MAN 0384
î Display background (exited by time-out) â a display appears, showing
the background signal. This display disappears when the time-out set in
the Time-out box is exceeded.
Alignment alarms
In normal operation the alignment of the system is monitored by the software and
an auto-alignment procedure is automatically performed if the system is out of
alignment. This will add a few seconds to the measurement time. Setting an align-
ment alarm will warn that the alignment threshold has been triggered but will not
stop the measurement.
To set an Alignment alarm in a manual measurement:
1. Select Measure-Manual.
2. Once the background measurements are complete, press the Options button.
3. Select the Measurement tab.
4. Select Alarms.
5. Select the Enable (warns when alignment is poor) check box.
6. Adjust the Sensitivity slider if necessary.
Diameter alarms
It is possible to set alarm limits for the three percentiles (D[v,0.1], D[v,0.5],
D[v,0.9]) that will trigger if the reported value of a percentile falls outside a prede-
fined size range. An upper and lower size limit can be set for each of the three per-
centiles.
The alarm can be set to stop the measurement if the alarm is triggered to allow
investigation of the source of the alarm.
To set a Diameter alarm in a manual measurement:
1. Select Measure-Manual.
2. Once the background measurements are complete, press the Options button.
3. Select the Measurement tab.
4. Select Alarms.
5. From the Diameter alarms section, enable a percentile alarm by selecting the
relevant Enable check box.
6. Set the upper and lower size limits for the alarm by changing the values within
the Lower limit and Upper limit boxes.
7. Click OK.
MAN0384-1.0 Mastersizer 2000.book Page 12 Tuesday, March 20, 2007 8:56 AM
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