Rayto RT-7200 - Page 28

RT-7200 Auto Hematology Analyzer User’s Manual
points in chart will randomly distributed on both sides of centerline, the farther from
centerline, the nearer to upper/lower control limits, there will be fewer points. Graphic screen
is as follows:
Fig.4-13 X-R QC chart
 Lot No.: lot number of QC object
 Expiry: validity period of QC object
 Seq#.: sequence number of current QC point
Each screen displays two-parameter QC data distribution. QC chart of each parameter is
composed of X chart and R chart, reflecting QC data mean and range fluctuation
respectively. Three values on the left of X chart are, from top to bottom:
X
+
RA
2
,
X
,
X
-
RA
2
, respectively. Three values on the left of R chart are, from top to bottom:
RD
4
,
R
,
RD
3
, respectively; where,
X
=
k
i 1=
Σ
i
X
/K,
i
X
is mean value of group i,
R
= /K, is
the difference between maximum and minimum of group i, K is subgroup quantity, , ,
are coefficients determined by number of samples in each group.
k
i 1=
Σ
i
R
i
R
2
A
4
D
3
D
Press “↓”, “↑” keys on keyboard or frame to switch between parameters.
Press “←”, “→” keys on keyboard or frame to display QC data of various sequence
numbers.
Press “Print” button to print out one current group of QC data.
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