Encoder Board PAL

Burst amplitude

19. Adjust the burst amplitude potentiometer to obtain a burst amplitude of 300mV.

Measure at:

CVBS out

Adjust with:

ZR210

Required result:

300mV

Correct:

 

0.1V

2µS

100

 

90

 

10

 

0%

 

 

VA+300mV

Burst timing

20.Observe waveform monitor or oscilloscope and adjust the burst position so that it is 5.6µS from the leading edge of the line synchronisation.

Measure at:

CVBS out

Adjust with:

ZR209

Required result:

Correct:

 

50mV

1µS

100

 

90

 

10

 

0%

 

 

t+5.6µs 178kHz

Genlock free-running preset

21.Remove genlock signal from camera.

22.Turn lock range potentiometer ZR215 fully counterclockwise.

23.Observe colour monitor, waveform monitor or vectorscope and adjust oscillator preset potentiometer.

Measure at: CVBS out

Adjust with: ZR216

Required result:

Minimum freerunning speed

Sc-H phase relationship

24.Switch vectorscope to internal synchronisation.

25.Adjust Sc-H phase potentiometer for 180°.

Measure at:

CVBS out

Adjust with:

ZR217

Required result:

Correct:

 

 

%

 

 

VOLT

120

 

 

 

100

R

cy

0.7

 

 

80

g

MG

 

 

V

 

 

 

 

60

75

 

 

 

100

b

5

40

YL

 

 

U

0

 

 

 

20

yl

B

-5

 

 

 

0

20

G

mg

 

 

 

 

43

r

CY

0.3

 

 

26. Switch off power and return encoder board to its position in the camera.

Adjustments

Technical Manual LDK 20(S) - Studio Camera

4-41

Page 67
Image 67
Technicolor - Thomson LDK 20(S) Burst amplitude, Burst timing, Genlock free-running preset, Sc-H phase relationship