Tektronix 2200 Manual Do Utilizador

2-78

For 50 µS to 70 µS of delay, select the serial source with the latest delay and 
connect it to the serial-to-analog converter. 

For 70 µS to 90 µS, select the serial source with the earliest delay and 
connect it to the serial-to-analog converter.

1. Connect the Y (or G) output of the converter to the scope. 

2. Adjust the delayed sweep on the scope so that the midpoint of the 

black-to-white transition is at a reference point.

3. Connect this source to a primary switcher input, and select it on the 

program bus. 

4. Connect the serial program output to the input of the converter. Adjust 

the rotary switches on the front of the Sync Generator Module so that 
the black-to-white transition is later than the previously noted 
reference point by the desired amount of delay.

A

A

B

B

Analog chroma key input requirement

Serial chroma key input requirement

Output timing range adjustment

Nominal switcher delay

Minimum switcher delay (Serial input)

+/- A

+/- B

+ C

 D

E

+/- 1 µS

+/-22 µS

+16 µS

70 µS

48 µS

Nominal Switcher Delay D µS

E

C

Output timing range
Manually adjustable
 +E µS

Nominal Output Timing

Nominal Reference Timing

Analog Chroma Key 
input requirement
manually adjustable 
+/- A µS

Serial input timing 
requirement 
automatically 
adjusts +/- B µS

Entire switcher timing (input and output) may move 
+/- 37 µS relative to the reference.