Siemens MULTIMOBIL 5C, Руководство по устранению неисправностей, Страница: 15 / 74

Service Instructions
Multimobil 5C
Siemens Ltd. Med India Version 5.0 Page 14 of 73
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SIEMENS LTD. All rights reserved. For internal use only
¾ Set exposure parameters as 60kV 20mAs.
¾
Release an exposure.
¾ The readings should be within
±
5% of the selected value.
¾ Repeat with meter setting 77-150kV and exposure parameter setting as 90kV
20mAs.
2.6.5.2 Electrical
¾ Connect oscilloscope at D915.TP.kV.
¾
Set the exposure parameters as 60kV, 2.5mAs.
¾ Release an exposure.
¾ The recorded waveform should be within
±
5% of the set value. (1V
⇒
20 kV)
¾ Repeat with 90kV 1.6mAs.
2.6.6 mA / mAs Measurement
¾ mAs measurement could be carried out either by mAs-meter or by electrical
measurement.
2.6.6.1 mAs-meter
¾ Remove mAs link on D506.
¾ Insert mAs-meter leads in the banana sockets mA+ and mA- on D506.
¾ Set meter at DC mA, 200mAs and in the mAs mode.
¾ Set exposure parameters as 60kV 20mAs.
¾ Release an exposure.
¾ The reading should be within
±
5% of the selected value.
¾ Repeat for exposure parameters 90kV 16mAs.
¾
The actual tube current can be measured by setting the meter in mA mode.
¾ Set the exposure parameters as 60kV 50mAs.
¾ Release an exposure.
¾
During the exposure, the reading should be within ± 5% of the mA as per the
exposure chart.
2.6.6.2 Electrical
¾
Connect oscilloscope at D915.TP.JR.
¾ Set exposure parameters 60kV 2.5mAs.
¾ Release an exposure.
¾
The recorded waveform should be within ± 5% of the mA as per the exposure chart.
(1V
⇒
20mA)
2.6.7 Tuning
It is necessary to re-tune the unit in case of undershoot or overshoot observed in the
mA wave shape.