Hitachi KP-FD140F User Manual
Page 15
5
-AUTO-
Setting value 83000000 h
Gain is automatically adjusted in the range of 0 to 18 dB in response to light source brightness.
(5) SHUTTER
(CSR: F0F0 081C h)
Sets electronic shutter speed.
-OFF-
Setting value 80000000 h
Switches off shutter operation.
*The shutter speed (at OFF) is as follows.
・
KP-FD140F/F140F
1/30 second (VGA), 1/15 second (SVGA, XGA, SXGA)
・
KP-FD32F/F32F
1/60 second
・
KP-F83F 1/30
second
-Manual adjustment-
Setting value 82000xxx h
xxx: 000h to 600h
Electronic shutter can be set in the range of 10 to 1/100,000 second.
Shutter speed setting value can be derived as follows. (ShutterSpeed : μsecond)
a)
Setting value xyy obtained from exposure time.
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
×
⎟
⎠
⎞
⎜
⎝
⎛
−
=
=
9
100
1
10
h
ed
ShutterSpe
ed
ShutterSpe
x
yy
x
int
))
int(log(
b) Exposure
time obtained from setting value.
sec]
)[
9
100h
yy
1
(
10
1
x
µ
Ч
+
Ч
=
+
ed
ShutterSpe
Ex.1 Exposure time = setting value nnn to obtain 1/125 second (= 8000μsecond).
2C7
nnn
C7h
9
100h
yy
x
3
=
∴
=
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
×
⎟
⎠
⎞
⎜
⎝
⎛
−
=
=
=
1
10
8000
3
8000
int
))
int(log(
Ex.2 Setting value 25Dh that produces 1/234.22 second exposure time.
[sec]
22
.
234
1
sec]
[
4269.53
)
9
100h
5Dh
1
(
10
1
2
=
=
Ч
+
Ч
=
+
µ
ed
ShutterSpe
-AUTO-
Setting value 83000000 h
Auto electronic shutter operates to vary the shutter speed in the range of 10 to 1/100,000 second in
response to light source brightness.
If light is excessive, a suitable level is selected for maintaining a video output. This function is effective
when using microscope or other optical system without an automatic lens iris.
(6) AUTO EXPOSURE
(CSR: F0F0 0804 h)
At auto gain (AGC) or shutter (AES) setting, the sensitivity is automatically adjusted to maintain the
proper video level.
-Manual adjustment-
Setting value 820000xx h
xx: 00h to FFh (standard 80h)
Video level decreases toward 00h and increases toward FFh.