Tektronix AVG1, User Manual

Page: 26 / 146

Functional Overview
2- 2
AVG1 Analog Video Generator User Manual
This module has four BNC connectors on the rear panel: one Trigger Out and
three channel outputs. The channel outputs can be configured as shown in
Table 2--1. To configure the outputs, refer to
Configure the Outputs on page C--9.
Table 2- 1: AVG1 Output Configurations
Connector GBR Y, B-Y, R-Y Hardware modulated Software modulated
Channel 1 G Y Y or Composite Composite 1
Channel 2 B B-Y C or Composite Composite 2
Channel 3 R R-Y Composite Composite 3
There are two methods of signal generation for composite signals: hardware
modulation and software modulation. Hardware modulated signals are preferred
when the lowest amount of differential phase and differential gain is required.
Hardware modulated signals use less memory than software modulated signals;
and signal parameter adjustments are more complete and responsive.
Chroma quantization makes differential phase and differential gain measure-
ments more difficult when using modulated ramp, modulated 5 step, and
modulated 10 step signals. To minimize this effect, adjust the Chroma Gain
Video Parameter to 102.0%. Refer to page 2--11.
Software modulated signals are preferred when three different signals are
supplied by the module at one time. PAL is not supported in this mode, because
of the 25 Hz offset.
Push the front-panel HELP button to display a help window. The help window
describes the window you were using when you pushed HELP.
Outputs
Modulated Signals
Online Help