Siemens 25 Руководство по устранению неполадок - Страница 6

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Higher kV indicates error in kVsoll / kV sensing / kV regulator.

7.5.2 mA / mAs Measurement

mAs measurement could be carried out either by mAs-meter or by electrical

measurement.

7.5.2.1

mAs-meter

Remove mAs link on D920.

Insert mAs-meter leads in the banana sockets mA+ and mA- on D920.

Set meter in the mAs mode at 200mAs.

Set exposure parameters as 60kV 20mAs.

Release an exposure.

The meter will read 19 - 21mAs.

Repeat for exposure parameters 90kV 16mAs.

The meter will read 14.4 to 17.6mAs.

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 meter will read 23 - 27mA.

7.5.2.2

Electrical

Connect oscilloscope at D915.TP.JR.

Set exposure parameters as 60kV 2.5mAs.

Release an exposure.

The recorded waveform will read 1.58 - 1.62V.

The exposure time will be 76 - 84mS.

Lower mA indicates error in mAsoll / mAsensing / mA regulator circuit.

Higher mA indicates error in mAsoll / mA sensing / mA regulator OR Low kV.

Incorrect mAs indicates Error in timer.

7.6

In case of CODEs which Impair radiography, perform the following checks.

Measure the supply voltage at site using the digital multimeter.

Ensure that the supply conditions

• Voltage

• Frequency

• Mains Resistance

are within limits as specified in the Technical Specifications for the Unit.

Switch the Unit ON

Siemens Ltd. Med India

Version 6.0

Service Manual

Service Instructions

7-5