HDNS-2200 View Datasheet(PDF) - Agilent Technologies, Inc
Part Name
Description
MFG CO.
'HDNS-2200' PDF : 36 Pages View PDF
Shutter_Lower
Access: Read
Address: 0x0e
Reset Value: 0x64
Bit
7
6
5
4
3
2
1
0
Field
S7
S6
S5
S4
S3
S2
S1
S0
Shutter_Upper
Access: Read
Address: 0x0f
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
S15
S14
S13
S12
S11
S10
S9
S8
Data Type: Sixteen bit word.
USAGE: Units are clock cycles; default value is 64. Read Shutter_Upper first, then Shutter_Lower. They should be read consecutively. The shutter is
adjusted to keep the average and maximum pixel values within normal operating ranges. The shutter value may be different on every frame. For
each frame, the shutter can only change by ± 1/16 of the current value. Shown below is a graph of 250 sequentially acquired shutter values,
while the sensor was moved slowly over white paper.
Shutter Values (White Paper)
64
48
32
16
0
0
25
50
75
100
125
150
175
200
225
250
The focus point is important and
could affect the shutter value.
Figure 40 shows another setup
with various Z-heights. This
graph clearly shows that the
shutter value is dependent on
focus distance. It shows average
readings over different heights.
3.5
3.0
X + 3σ
X
2.5
X – 3σ
2.0
1.5
1.0
0.5
0
-1 -0.75 -0.5 -0.25 0 0.25 0.5 0.75 1
Distance from Nominal Focus (mm)
Figure 40. Typical shutter vs. Z (white paper).
31
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