Table of Contents
Advertisement
Encoder Board NTSC
Set-up
1. Switch off power. Place encoder board on service extender.
Genlock camera with black burst signal. Switch on power.
2. Connect oscilloscope via a vectorscope terminated with 75Ohm to the CVBS output of the camera.
3. Switch on colour bar.
Black balance
4. Turn chroma potentiometer R4 on encoder board fully clockwise (max. chroma).
5. Adjust the I and Q balance potentiometers for minimum unbalance in black.
Measure at:
Adjust with:
CVBS out
ZR203
ZR206
6. Turn chroma potentiometer R4 on encoder board fully counterclockwise (zero chrominance).
CVBS amplitude
7. Adjust the CVBS gain potentiometer to obtain an output amplitude of 549mV (77 IRE).
Measure at:
Adjust with:
CVBS out
R14
White bar amplitude
8. Adjust the white amplitude potentiometer to obtain an output of 714mV (100 IRE).
Measure at:
Adjust with:
CVBS out
ZR213
Adjustments
Required result:
Smallest possible
dot in centre of
vectorscope
Required result:
Correct:
549mV
(77 IRE)
100
90
10
0%
Required result:
Correct:
714mV
100
90
10
0%
Technical Manual LDK 20(S) - Studio Camera
0.1V
10µS
VA+549mV
10µS
0.1V
VA+714mV
4-43
Advertisement
Table of Contents
