Mammomat 1000/3000
Register 3
SP B7-230.033.07
Page 2 of 6
Siemens-Elema AB
Installation and Start-Up
Rev. 03
11.99
SPS-UD
Solna, Sweden
10 - 2
Checks with high voltage
3.
Connect oscilloscope to P.C. board D705 as follows:
•
Channel 1 to measuring point "KVIST
(actual value)
" (1 V= 5 kV).
•
Channel 2 to measuring point "MAIST
(actual value)
" (1 V= 40 mA).
•
Trigger at measuring point "KVE" (start with high voltage "ON"), rising edge.
•
Twist the measuring leads and connect their grounding braids to measuring
point "0 VA".
4.
Connect service PC to circuit board D702 using the connection cable.
5.
Start service program, see Chapter 20 "Appendix".
6.
Check the anode menu for correct selection (tungsten anode enabled or disabled,
depending on which type of X-ray tube the customer has choosen). See Service
Program Instructions RX B7-230.114.01. ... .
Checking X-ray tube high voltage, tube currrent and mAs values
10
1.
System "ON".
2.
Set the "cassette loaded" switch to "OFF" with the service PC program:
Configuration - Miscellaneous - Cassette loaded check.
3.
Trigger test exposures with the following exposure values and check the kV
values and tube current characteristic on the oscilloscope (see oscillograms).
The accuracy of the kV is
&
5% plus
&
1.5 kV during the first 5 ms of the exposure.
For mA values < 50 mA, the accuracy of the kV is
&
5% plus
&
2 kV during the first
5 ms.
The tube current must rise quickly to the set value at the beginning of the expo-
sure and run linearly during the exposure, however, not when TCR is running.
The accuracy of the mAs product must be
&
10%.
4.
Replace the jumper previously removed.
Tube current reduction
10
Switch S3 on circuit board D702 must be set to upper position.
It is possible to select tungsten anode, even if the customer does
not have this option. However, the 50
µ
m Rh filter will then be
missing.
In MAMMOMAT, the tube current reduction is factory-set to "ON"
(see Chapter 12 "Further programming" and test certificate). In
this way, the tube current is reduced to approximately 50 mA at
the start of the exposure during the time programmed in Chapter
12 "Further programming". The tube current reduction is effective
only in IONTOMAT mode with Bucky.
NOTICE
NOTICE
NOTICE
