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18
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Adjusting the Video Amplifier
6Adjusting the Max. Brightness/Contrast
General Remarks
•
The maximum brightness and the maximum contrast are adjusted in the window (Ad-
justment => Video Amplifier). Adjustment can be made to these set values using the
front control knobs (brightness/contrast) or by means of the ambient light sensor, when
activated.
•
The settings are always performed in the 0% field for brightness and in the 100% field
for contrast. The exception is with Magic View; see the value table.
•
Test image
- AXIOM Artis ......
We use the "Siemens" test pattern (it has larger measuring fields than the SMPTE
test pattern).for H/C adjustment.
Select zoom to magnify the fields again. Move the corresponding field (0% - 100%) to
approx. the center of the image. Note: The hand symbol may not be in the measuring
field (incorrect measurement)!
Important:
The window for the test pattern must always be fully opened in AXIOM ARTIS.. If the
window values are/were changed, the "Patient" closed, the "new" values are saved!
Open values:
WC 2048
WW 4094
- The adjustment can be performed with the test image for the particular digital system
or with the monitor multinorm test box. If the test box is used, pay attention to the cor-
rect "Norm" as well as to the BAS values!
- HICOR / ACOM
If the SMPTE test pattern is used, the test point for the black value is at the right edge
of the screen, outside the SMPTE test image.
- Multistar TOP
Use the black / white test image.
- Multistar KK
If the SMPTE test pattern is used, the zoom function must be used to obtain a
sufficiently large black area for the measurement.
- Monitor Mulitnorm Testbox.
In the list box, the corresponding system (e.g. HICOR, ... ) must be selected.
The black/white test image must be used for the adjustment.
If HICOR is selected (also general) pay attention to the video level: change the
B-signal to 650mV and the A-signal to 50mV (with 1V BAS).
•
Warm-up phase
- The monitor must be left on for at least 20 minutes (warm-up behavior of the picture
tube). If the time is too brief, it will not be possible to make a selection in the screen.
SIMOMED HM
Adjusting the Max. Brightness/Contrast
RA52-060.061.01.07.02
07.02
Page 18 of 24
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Siemens AG
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