Anode Current Check By External Device - Siemens MAMMOMAT Balance Troubleshooting Manual

Filament

Anode current check by external device

Anode current check can be carried out using a voltmeter or an oscilloscope connected to resistor
R16 of PCB 92-073.
Measurement is executed during an exposure of a minimum time consistent with reading time of
device used.
In case of use of a digital voltmeter >1" and consequently 100 ÷ 130 mAs per large focal spot and 32
mAs per small focal spot.
DO NOT USE DIGITAL VOLTMETERS IN AUTORANGING MODE AS THEY NEED READING
TIMES LONGER THAN 1".
In case of use of a memory oscilloscope values suggested are the same for internal mA meter (40
mAs for the 0.3 mm focus, 13 mAs for the 0.1 mm focus).
I(A)
do not calibrate kV values not mentioned in the table.
WARNING
MAMMOMAT Balance SPB7-115.840.01 Page 32 of 62 Siemens AG
Troubleshooting Guide Rev.02 10.04 Medical Solutions