Hitachi KP-F32F 用户手册

5 

Setting value 83000000 h 
Gain is automatically adjusted in the range of 0 to 18 dB in response to light source brightness. 

 

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 

 

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

x

yy

x

int

))

int(log(

 

 
b) Exposure 

time obtained from setting value.

 

sec]

)[

9

100h

yy

1

(

10

1

x

µ

×

+

×

=

+

 

 
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

　　

　　

=

=

×

+

×

=

+

µ

 

 

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 

At auto gain (AGC) or shutter (AES) setting, the sensitivity is automatically adjusted to maintain the 
proper video level.

Setting value 820000xx h 

 

xx: 00h to FFh (standard 80h) 

Video level decreases toward 00h and increases toward FFh.