NED
UME-0027-03 XCM6040SAT2
77
9.4 Bending the line three times
①
For an integration time ratio of 10, send the following commands: “msl 4, 8,
12”; “mst 1, 10, 100”; “int 0, 1023”, then set multi-slope mode. The integration
time becomes 1000 in the first slope, 100 in the second slope, 10 in the third and
1 in the fourth. Respective knee points become ¼, ½, ¾ of the saturation level,
as the diagram below indicates.
The minimum line period is 548.8us (240MHz) or 823.2us (160MHz). The
dynamic range becomes 284 times 1 (ratio of saturation exposure amount:
28.4/0.1), i.e. 109dB (60dB + 20log284 = 109).
②
For an integration time ratio of 5, send the following commands: “msl 4, 8, 12”;
“mst 1, 5, 25”; “int 0, 156”, then choose multi-slope mode. The integration time
becomes 125 (156-(1+5+25) in the first slope, 25 in the second slope, 5 in the
third slope and 1 in the fourth slope. The respective knee points become ¼, ½,
¾ of the saturation level, as the diagram below indicates. The minimum line
period becomes 86.4us (240MHz) or 129.6us (160MHz). The dynamic range
becomes 39 times 1 (ratio of saturation exposure amount: 3.9/0.1), i.e. 92dB
(60dB + 20log39 = 91.8).
0
255
511
767
1023
o
u
tp
u
t（
1
0
b
it
d
ig
it
al
d
at
a)
light exposure（lux･sec)
0.025
0.28
2.84
28.4
Amount of saturation exposure
The first slope
The second slope
The third slope
The fourth slope
