Capintec CAPRAC-t User Manual

CAPINTEC, INC. CAPRAC
®
-t
9-22 TESTS April 2021
Any of the entered data or the MDA Background measurement can be changed and
new results obtained by touching the any of the field boxes and re-measuring or re-
entering the data for the desired field(s). Touch the CALCULATE button and the new
results will appear using the new entries.
To exit Figure 9-16 MDA Test Results Screen,
• touch the BACK button – Figure 9-6 Quality Assurance Screen will re-appear
or
• touch the HOME button – Figure 9-5 Main Screen will appear.
Chi Square Test
The Chi Square Test provides a sensitive check of the overall counting performance of the
system. The software will use the 662 keV peak of the Cs137 Test Source for the tests.
# Repetitions 0.95 0.90 0.10 0.05
5
.711
1.06
7.78
9.49
10
3.33
4.17
14.7
16.9
15
6.57
7.79
21.1
23.7
20
10.1
11.7
27.2
30.1
Table 9-1
In the table above, you can see that for a typical 10-repetition test, the Chi Square value
should be between 3.33 and 16.9 for 90% of the time. Therefore, it is expected to be outside
this range 5% of the time. Also, because of the statistical nature of the Chi Square test, the
Chi Square values should not remain exactly the same. They are expected to vary.
The Chi Square Test value is calculated from the following equation:
( )
∑
=
−=
n
i
avi
av
xx
x
1
2
2
1
χ
tsmeasuremen
for the average
t measuremenfor counts
where
nx
ix
av
i
=
=
This equation is the same as the following:
( ) ( ) ( )
{ }
22
2
2
1
2
...
1
avnavav
av
xxxxxx
x
−++−+−=
χ
To perform the Chi Square Test, from Figure 9-6 Quality Assurance Screen, touch the CHI
SQUARE TEST button. Figure 9-17 Chi Square Test Screen will appear.

Capintec CAPRAC-t Specifications

General

Brand	Capintec
Model	CAPRAC-t
Category	Cash Counter
Language	English