6
3.4 Gain Control Mode (AGC/MGC)
Automatic gain control (AGC):
AGC/MGC switch is located on the rear plate.
AGC factory setting is 2V for AGC control and 3V for AGC MAX control. Therefore, the maximum gain is about
18dB as shown in Figure 6 below. AGC setting cannot be changed through the rear gain potentiometer.
Manual gain control (MGC):
The manual gain control can be adjusted from 5dB to 18dB through the gain potentiometer on rear plate.
Note: 32dB gain can be obtained through custom orders.
Figure 6. AGC and AGC MAX Control Characteristics
3.5 Gamma 1.0 and 0.45 Mode
Gamma is the numerical value of the degree of contrast in a television picture. Gamma correction is the system
response modification by providing linear transfer characteristic from the input to output. In general, circuit built
into a TV camera to compensate for non-linearity that exists in display tubes. If the camera is connected directly
to a frame grabber, it is desired to set to Gamma 1.0. For direct connection to a TV monitor, gamma 0.45 is
recommended, since TV monitor has a non-linear correction. In general, gamma 0.45 is noisier than gamma 1.0,
which is why gamma 1.0 is chosen for machine vision applications. Gamma 0.45 is preferred when seeing video
at low light level, which is common for inspection by human eyes.
Figure 7. Gamma 1.0 and 0.45 Characteristics
