C-72
Chapter C - Basic Operations
Automated Chemistry Analyzer
AU2700 User's Guide
May, 2002
6. Use function key F5 (previous control test) and function key F6 (next control test) to look
at other QC test charts.
7. Select function key F3 (print) to print statistics, data, graphs, or comments.
8. Optional Step: Select function key F4 (comment) if you want to enter a comment.
9. After checking the chart, press function key F2 (exit).
The main screen returns.
Twin Plot Chart
Before viewing charts, look up QC alarms using the alarm help function and check the QC
samples listed on the printout for error flags. If an alarm or error flag occurs, correct the
problem. QC samples must be run with no flags or alarms before routine sample results are
valid.
See Also
For information about errors flags, refer to the Error Flags Chapter.
In quality control, usually a normal control and an abnormal control are used. The following
figure shows a two-dimensional plot with the normal control on the x-axis and the abnormal
control on the y-axis.
OLP4086E
+2SD
-2SD
Normal region
sample
Abnormal
region sample
MEAN
-2SD
MEAN +2SD
When the normal and abnormal controls are within a control limit, and both samples are high
values or low values, perform a calibration to determine system errors. If the high value of
an abnormal control is low, reagent deterioration may be the cause. The twin plot offers the
advantage of classifying problems as either a system error or a random error. To be used, it
must be programmed for multi-rule control procedures to determine if a drift is occurring or if
the reagent is unstable.
See Also
For information about shifts and trends, refer to the Troubleshooting Chapter.
Содержание AU2700
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