Thermo Scientific SAM12, Manual

Page: 57 / 176

Issue: 1.0 Operating Instructions
Thermo Fisher Scientific SAM12 User Manual 5-17
alarm conditions and background measurement - see
Alarms (page 5-12) .
Select Diagnostics|Timed Counts
to view Detectors averaged over
a selected specified period. This
function allows a count to be
made which can be used to
ascertain the efficiency and
functionality of the SAM12
To toggle between the individual Detector's Thresholds and
the Gross Sum of all Detectors views
, press the
Detectors|Gross Sum button.
To Start the Timed Counts for the Detectors
:
1. Select the number of SAM12 to be averaged by
selecting a value in the Average Over field.
2. If you require a Continuous count to be made, tick the
Continuous box.
3. Press Start button
To toggle between the Thresholds and Windows display,
tick the relevant radio button.
The variance check is a method by which the overall stability
of the background can be assessed by running a sequence of
background measurements and then assessing the variance of
the measured backgrounds over the sequence.
Select Diagnostics|Variance Test
to setup the background
monitoring over a number of
cycles to obtain a figure of
stability
Description of options:
Field Name Description
Number of Cycles Enter the number of background measurements to
be used in the test.
Cycle Duration
(seconds) Enter the duration of each measurement.
Upper Variance Limit Enter the Upper Variance Limit for the result.
Timed Counts
Variance Test