Mas Accuracy - Siemens MOBILETT XP Digital Maintenance Instruction

62
•
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)
•
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:
- mAs meter (e.g., MAS meter 8160400 with a measuring accuracy of 1 % ± 1
decimal place)
2.) Oscilloscope method:
- Storage oscilloscope with a measuring accuracy of ± 2.5%
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.
•
X
Release exposures according to the table.
Parameter setting
MOBILETT XP Digital
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
After switching the unit on, wait approx. 5 minutes for it to stabilize.
kV
40
81
133
SPR8-230.831.30.03.02
11.05
Inspection and maintenance
Allowable mAs value
mAs
5
2
10
Page 62 of 74
CS SD 24
4.7 - 5.3
1.9 - 2.1
9.5 - 10.5
Siemens AG
Medical Solutions