Kamera Video

Video camera

A. Goal
1. Know the video camera.
2. Measuring the composite video on a video camera.
3. Determine the parameters of composite video.

B. Used Equipment
1 Video Camera
1 Oscilloscope 40 MHz and passive probe
An RCA cable connector - BNC )(75

C. Circuit diagram

 

D. Preliminary
A comprehensive idea of a TV camera function is depicted in Figure 3-2 and 3-3. In Figure 3-2 the camera is aimed at scene / view so that the optical image (optical image) can be focused on the target plate tube makers (pick-up tube). If you can look inside, you'll see the shadow-optical. The resulting video signal is shown by the oscilloscope waveform in the bottom left of the picture. Above is a monitor oscilloscope, which shows a reproduced image.
 

Figure 3-3. Block diagram that shows how the television camera composite video signal output channel. Here is shown the reflection and focusing the camera tube.

Details of the video signal waveform which is more fully shown by the block diagram in Figure 3-3. At first, blanking pulses added to signal the camera. They cause the signal amplitude to the black levels so pengulangjejakan (retrace) the MRV will not be visible. Further alignment pulses (sync) is inserted. Alignment (synchronization) is required to set the time & MRV horizontal and vertical.
Camera signal with blanking and synchronization (sync) is called a composite video signal (composite video signal). Sometimes the term is not a composite video signal (noncompoxite video signal) is used to identify the signal with blanking camera but without alignment. Standard output level of the composite video signal from the camera is 1Vpuncak-to-peak (pp = peak to peak) with the alignment pulses in the down position for negative polarity.

E. Experimental Procedure
1. Set-up devices like the picture above, connect the video camera out with input CRO.
2. Consolidate his instrument.
3. Set the appropriate CRO to be easily observed (MODE on the TV-H position and / or TV-V). When seeing a wave of horizontal synchronization MODE switch put on the TV-H position, while to see a wave of vertical sync put the MODE switch on the TV-V position.
4. Determine the synchronization pulses, blanking pulses, front and rear porch, and image information.
5. Image of the wave form and specify voltage.
F. Experiment Results and Analysis

 
If the mode switch on the TV-H


If the switch on the TV-V mode

 
Images credit picture information

Fig pulse alignment
 
Fig pulse blanking (blanking)


If the switch on the TV-V mode voltage = 1.2V
 If the switch on the TV-H mode voltage = 2V
Data Analysis

 



TV-V

TV-H

Pulsa Penyelarasan

Pulsa Pengosongan

Pulsa Informasi

Serambi depan
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Serambi Belakang

G. Conclusion
1. Blanking pulse causes the signal amplitude to the black levels so pengulangjejakan (retrace) the MRV will not be visible.
2. Toll-alignment (synchronization) is required to set the time & MRV horizontal and vertical.
3. Voltage is obtained between the mode switch on the TV-V = 1.2V while the mode switch on the TV-H = 2 V.
4. Alignment between the scanning process on the camera with a TV is called synchronization.

5. The components forming the composite video is 5, namely:
• image signal (luminance signal)
• horizontal blanking pulse
• vertical blanking pulse
• Horizontal synchronization pulse
• Vertical synchronization pulse