The Individual Tests - Siemens SOMATOM Spirit Operator's Manual

Constancy Test of the Monitor
Performing the luminance
measurements
F.6-6

The individual tests

In this test the veiling luminance (environmental lighting) and
the maximum contrast are tested.
F . 6
Switch the monitor off and wait at least 30 seconds.
✧
Adjust then the room lighting to the operating conditions
✧
using the dimmer switch.
Measure veiling luminance Ls at the center of the screen
✧
with the luminance meter.
i
When taking measurements with the luminance meter, observe
. 6 F
the distance recommended by the manufacturer (40 - 60 cm).
Switch on the monitor.
✧
Select test image 1 to measure the minimum and maxi-
✧
mum luminance.
i
In test image 1, the squares for the maximum grayscale value
. 6 F
(L , bright field) and the minimum grayscale value (L
max.
black field) are used.
Quality Assurance
,
min.
SOMATOM Spirit
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