48 Inspection and Maintenance
MOBILETT Plus HP SPR8-220.101.04.03.02 Siemens AG
07.05 CS PS 24
Page 48 of 64
Medical Solutions
• If the value for the fluctuation coefficient calculated is higher than 0.045, the reason for
the deviation must be determined and corrective measures 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 values measured.
• 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 => Σ = 10.25
• Calculate the average value:
Fig. 24:
• Calculate the standard deviation:
Fig. 25:
Exposure
(n=10)
Measured values
(xi)
11.01
21.02
31.03
41.04
51.03
61.02
71.02
81.01
91.03
10 1.04