62 Inspection and maintenance
MOBILETT XP Digital SPR8-230.831.30.03.02 Siemens AG
11.05 CS SD 24
Page 62 of 74
Medical Solutions
• Connect the oscilloscope to the measuring points of the (CPU) D916 TP ”KV” and
“KVS” (also see the troubleshooting instructions). Oscilloscope setting: Channel 1 = TP
KV 1V/div, channel 2 TP KVC 2V/div, trigger channel 2, trigger stage 2.5 V, 2V/div, 50
ms/div (oscilloscope setting: Channel 1 = TP KV 1V/div, channel 2 TP KVC 2V/div, trig-
ger channel 2, trigger stage 2.5 V, 2V/div, 50 ms/div)
¹ Oscilloscope setting: Channel 1 = TP "KV" 1V/div, channel 2 TP "KVS" 2V/div,
trigger channel 2, trigger stage 2.5 V, 50 ms/div
• Follow the same procedure as described in “kV meter method”.
3.7.2 mAs accuracy
Requirement:
The measured mAs values must be within the limit values, see tables.
One of two measuring methods can be used:
1.) mAs meter method:
2.) Oscilloscope method:
Oscilloscope method:
• Open the top cover of the MOBILETT XP Digital and place it sideways on a table or the
like. Do not disconnect any cables.
• Connect the oscilloscope to the "JR" and "GND" measuring points on CPU D916.
• Switch on the MOBILETT XP Digital.
• Select the analog operating mode.
¹ After switching the unit on, wait approx. 5 minutes for it to stabilize.
X
• Release exposures according to the table.
- mAs meter (e.g., MAS meter 8160400 with a measuring accuracy of 1 % ± 1
decimal place)
- Storage oscilloscope with a measuring accuracy of ± 2.5%
Parameter setting Allowable mAs value
kV mAs
40 5 4.7 - 5.3
81 2 1.9 - 2.1
133 10 9.5 - 10.5
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