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Fig. 5-2 Conceptual diagram of gain and offset levels
(5-2) Setting of shutter speed
The shutter speed is determined mainly by the shutter switch position from “0” to “9”.
When a shutter speed is specified using a communication command, the communication command is prioritized.
The shutter speed to be displayed is the one that is corresponding to the currently selected shutter switch position. When
“7” is selected for the mode switch, the current shutter speed can be changed.
(Note) The change of the shutter speed is enabled only when the shutter switch is set to any positions other than “0”.
As long as the shutter switch is positioned at “0”, shutter speed cannot be changed even if “7” is selected for the
mode switch and the UP/DOWN switch is manipulated. (The shutter is always OFF where the shutter switch = “0”)
→
Refer to the next section (Section 6) for the specific setting method.
(!) Since FC1600FCL is equipped with the independent shutter setting switch and mode setting switch, it does not require
the setting manipulation for the current shutter speed unlike the FC20 series products.
(5-3) Level setting
The level setting is mostly divided into the
following two groups:
●
Gain setting
This is to set the gain (amplification ratio)
of the preamplifier between the CCD imager
device inside the camera to A/D converter.
●
Offset setting
This is to set the offset of the preamplifier
between the CCD imager device inside the
camera to A/D converter.
→
Refer to the next section (Section 6) for
the specific setting method.
(Note) As for the offset setting, it is
recommended to use the factory
default setting except for a special
case.
(Note) Follow the procedure (gain setting
→
offset setting) if fine tuning of the offset value is required.
(5-4) MGC gain setting value
●
Gain variable amplifier and integrated gain
The image signal output from CCD is amplified inside the
camera through the following variable gain amplifier and
then through the fixed gain amplifier before being input into
the A/D converter.
The left block chart shows this flow.
(Note) The gain value (dB) described here is the one based on the CCD output (0 dB) as the baseline.
●
Correlation between MGC gain setting value and MGC gain
1 to 22 dB
GAIN
0 dB (Fixed)
A/D
Preamplifier
Variable gain
amplifier
Fixed gain amplifier
CCD
Integrated gain
MGC setting
1 to 22 dB
Signal level
1023
0
Time
Image signal
(Before setting adjustment)
Increase in GAIN
Increase in OFFSET
Signal level
1023
0
Time
Signal level
1023
0
Time
