Siemens MOBILETT Plus Maintenance Instructions Manual page 47
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Also See for MOBILETT Plus:
- Service instructions manual (114 pages) ,
- Manual (58 pages) ,
- Installation instructions manual (44 pages)
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Inspection and maintenance
•
If the value for the calculated fluctuation coefficient is higher than 0.045, the reason for
the deviation must be determined and corrective measures must be taken.
Refer to section "P10 - Fast adaptation" in the service instructions.
QSQ
Fluctuation coefficient C
Steps for calculating C
Example:
The values used in the example are not real values.
•
Release 10 exposures and record the measured values.
Exposure
(n=10)
1
2
3
4
5
6
7
8
9
10
•
Add the measured values:
Σ = 1.01 + 1.02 + 1.03 + 1.04 + 1.03 + 1.02 + 1.02 + 1.01 + 1.03 + 1.04 => S = 10.25
•
Calculate the average value:
Fig. 24:
•
Calculate the standard deviation:
Fig. 25:
Siemens AG
Medical Solutions
Measured val-
ues
(xi)
1.01
1.02
1.03
1.04
1.03
1.02
1.02
1.01
1.03
1.04
SPR8-215.831.04.03.02
07.05
MOBILETT Plus/ -E/ -M
Page 47 of 64
CS PS 24
47
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