Checking The Filament Frequency; Filament Current Measurement; Checking Of Kv And Mas Values - Siemens MULTIMOBIL 5C Troubleshooting Manual

5.3.2 Checking the Filament frequency

Turn the Unit OFF.
Open X11 connector on D915.
Connect oscilloscope to D915.TP.CAL
Turn the unit ON unit displays
Measure the CAL frequency at the CAL TP on D915.
It should be within 1.25 to 1.5kHz
If not tune P3 to set CAL within the above range.
Switch off the unit
Connect back X10 connector.

5.3.3 Filament current measurement

Turn the Unit OFF.
Connect oscilloscope to D915.TP.IH
Turn the Unit ON.
After approx. 3 seconds the Stand-by filament current starts & should be 1.5V ±
0.2V
Select radiography mode
Select the exposure release switch for 1 sec to enter into preparation.
Observe the change in voltage level from 1.5 V ± 0.2V to Preheat value 2.8V ±
0.3 V.
Note: Preheat value is parameter (kV & mAs) specific. Just observe the change in
level on preheating step.

5.3.4 Checking of kV and mAs values

5.3.4.1 Checking the high voltage kVsoll and kVist
Connect oscilloscope to D915.TP.KVS & D915.TP.KV
Turn the unit ON.
Select radiography mode.
Set parameters of 60kV 10mAs
Trigger an exposure.
Siemens Ltd. Med India Version 5.0
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Service Instructions
Multimobil 5C
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