XQ1395 Datasheet, PDF (5/6 Pages) PerkinElmer Optoelectronics – 1 High Resolution Resistron - Camera Tube

Blemish Specification
- Test Conditions
The tube shall be centred and focused according to the operating and adjusting instructions for
optimum performance.
Illumination should be adjusted to a signal current of 250 nA at a beam current for stabilising a
signal of 500 nA.
- Target Zone
A uniformly illuminated field with an aspect ratio of 3:4 and a scanned area of 15.0 mm x 20.0 mm
shall be displayed on the target of the camera tube. According to the following drawing the scanned
area is divided into three zones 1, 2 and 3.
The blemish size is measured in percent of the picture height. The equivalent numbers of TV-lines
are indicated for comparison purposes only. Black and white spots are equally weighted.
Measurement of blemishes will be performed with and without target illumination. The minimum
separation between two target spots must be greater than the diameter of the larger one, otherwise
the combination is considered as a whole. Target spots with a diameter ≤ 0.2 % of the picture height
as well as blemishes with a modulation depth ≤ 10 % are not counted, unless an accumulation
causes a smudged appearance.
Blurred spots, streaks, stripes, mesh defects and mottled or grainy background are only permitted
up to a noise amplitude of 10 %.
20 mm
Figure 2
Target Zone of Image Tubes
10 mm
5 mm
Zone 3
Zone 2
Zone 1
Possible Number, Size and Location of Blemishes
Specification
Blemish size in % of picture height Blemish size TV lines
15.0mm = 100 %
625 line system
> 0.7
>4
> 0.5 … ≤ 0.7
>3…4
> 0.2 … ≤ 0.5
>1…3
Max. permissible total number of blemishes
Maximum permissible number of blemishes
Zone 1
Zone 2
Zone 3
0
0
0
0
0
1
0
2
4
4
Blemishes outside the zone are not counted.
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Camera Tube
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