46 DHHS
MOBILETT XP Digital SPR8-230.814.30.03.02 Siemens AG
11.05 CS SD 24
Page 46 of 70
Medical Solutions
Test of mAs accuracy 0
Requirement:
The measured mAs values must comply with the limit values specified in the tables. One
of two measuring methods can be used:
1. mAs meter method:
- mAs meter (e.g. MAS meter 8160400 with a measuring accuracy of 1% ± 1 digit)
2. Oscilloscope method:
- Storage oscilloscope with a measuring accuracy of ± 2.5%
Oscilloscope method: 0
• Close the collimator.
• Remove the top cover and place on a table or similar surface. All cables remain con-
nected.
• Clamp the oscilloscope to the “JR” and “GND” measuring points on CPU D916.
• Switch the MOBILETT XP Digital on and select manual operation.
• After switching the unit on, wait for approx. 5 minutes to let it stabilize.
Example: Calculation of the mAs value
Fig. 19: mAs calculation
The mAs value can be calculated with the help of the oscilloscope display.
Surface “A” corresponds to the mAs value.
mAs = tube current x exposure time
mAs = 340 mA x 0.006 s = 2.0 mAs
To Next Page
Loading...
