
20
5.6.2.2 Default:
The camera defaults to max. gain if the external "black box" is not plugged into a camera that
has been modified for EGC.
5.6.3 Manual External Offset Control:
If this option is installed, the internal analog offset control potentiometer is replaced by an
external multi-turn potentiometer that is installed on an external "black box". The potentiometer
circuit connects to the camera through the DB-37 connector (pin 18 is used for the offset control
DC voltage). Since power is derived from the camera AUX. POWER pin (DB-37, pin 36), no
external power supply is needed. A micrometer knob with a locking mechanism allows the user
to accurately calibrate the application and lock-in an optimum offset setting for the application's
light level. The range of operation of the External Offset function is 0 to 14 IRE units from a dial
setting of 0.00 to 10.00 respectively. It has a linear response (see curve below).
5.6.3.1 Default:
The camera defaults to max. offset if the external "black box" is not plugged into a camera that
has been modified for External Offset Control.
5.6.3.2 RS-170 Pedestal:
The RS-170 standard specifies a "setup" or "pedestal" of 7.5 IRE units. As shown on the above
curve, this is obtained with a micrometer dial setting of around 5.25 (actual settings will vary
slightly from unit to unit).
Analog Video Offset (IRE) vs. Dial Setting
0
2
4
6
8
10
12
14
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
10.00
Dial Setting
Analog Video Offset (IRE)
RS-170 Standard Offset = 7.5 IRE
Figure 5-7: Manual External Offset Control Curve
Содержание DigitEyes Series
Страница 14: ...9 Figure 4 3 TC 245 Gate Level Drawing Texas Instruments 1994 ...
Страница 61: ...56 12 Appendix D Camera Mechanical Drawings Figure 12 1 Camera Mechanical Drawings ...
Страница 63: ...58 Figure 13 2 Camera Noise Spectrum Min Gain Bandwidth 10kHz to 4 2MHz ...
Страница 64: ...59 Figure 13 3 Camera Noise Spectrum Max Gain Bandwidth 100kHz to 4 2Mhz ...
Страница 65: ...60 Figure 13 4 Camera Noise Spectrum Max Gain Bandwidth 10kHz to full ...