Measurement Of Protective Ground Wire; Measurement Of Substitute Leakage Current; Value First Measured - Siemens MOBILETT Plus HP Installation And Setting Instructions Manual

Installation and setting
Fig. 7
•
Process the film and measure the deviation between the light field and the X-ray field.
Permissible deviation ±1.7 % of the SID, see fig. 7.
If the deviation is greater, see "Service Instructions, section Exchange and repairs on the
collimator".

Measurement of protective ground wire

?
Measuring instruments required: test instrument for protective ground wire
•
Measure protective ground wire according to ARTD-002.731.17... "Safety regulations for
installation and maintenance".
Resistance of protective ground wire ≤ 0.2 ohms.

Measurement of substitute leakage current

?
Measuring instruments required: test instrument for leakage current.
•
Measure the substitute leakage current according to ARTD-002.731.17...
"Safety regulations for installation and maintenance".

Value first measured

When the substitute leakage current is measured, a first measurement and so-called
repeat measurements are carried out. It is the purpose of these repetitions to detect as
early as possible any deviations from the value "first measured" and consequently
changes in the safety structure of the system.
In the measurement of the first value, the permissible maximum value of 2 mA must not
be exceeded.
The value "first measured" has to be entered in the test certificate at the end of the instal-
lation and setting instructions.
Siemens-Elema AB
Solna, Sweden
A+C
< 1,7 %
SID
B+D
< 1,7 %
SID
- - - - - - - -
________
SID = Source image distance
SPR8-220.033.01
Rev. 05 05.01
= Light field
= X-ray field
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