Ma / Mas Measurement; Tuning - Siemens MULTIMOBIL 5C Troubleshooting Manual

Set exposure parameters as 60kV 20mAs.
Release an exposure.
The readings should be within ±5% of the selected value.
Repeat with meter setting 77-150kV and exposure parameter setting as 90kV
20mAs.
2.6.5.2 Electrical
Connect oscilloscope at D915.TP.kV.
Set the exposure parameters as 60kV, 2.5mAs.
Release an exposure.
The recorded waveform should be within ± 5% of the set value. (1V ⇒ 20 kV)
Repeat with 90kV 1.6mAs.

2.6.6 mA / mAs Measurement

mAs measurement could be carried out either by mAs-meter or by electrical
measurement.
2.6.6.1 mAs-meter
Remove mAs link on D506.
Insert mAs-meter leads in the banana sockets mA+ and mA- on D506.
Set meter at DC mA, 200mAs and in the mAs mode.
Set exposure parameters as 60kV 20mAs.
Release an exposure.
The reading should be within ± 5% of the selected value.
Repeat for exposure parameters 90kV 16mAs.
The actual tube current can be measured by setting the meter in mA mode.
Set the exposure parameters as 60kV 50mAs.
Release an exposure.
During the exposure, the reading should be within ± 5% of the mA as per the
exposure chart.
2.6.6.2 Electrical
Connect oscilloscope at D915.TP.JR.
Set exposure parameters 60kV 2.5mAs.
Release an exposure.
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.
Siemens Ltd. Med India Version 5.0
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Service Instructions
Multimobil 5C
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