Tektronix AVG1, User Manual

Page: 143 / 146

Glossary
AVG1 Analog Video Generator User Manual
Glossary- 3
SCPI
Standard Commands for Programmable Instruments. SCPI is a standard that
provides guidelines for remote programming of instruments. These
guidelines provide a consistent programming environment for instrument
control and data transfer.
Signal Set
An arbitrary group of signals.
Soft key
An item on the display that changes state or initiates an action when you
touch it on screen. You use soft keys to select test signals or enter a file
name.
Software Modulation
When signals are software modulated, the data is directly stored in each
channel of fast access memory, in which case the AVG1 can output three
different composite signals. With software modulated signals, the subcarrier
is directly defined when the signal data is created.
Termination
In order to accurately send a signal through a transmission line, there must
be an impedance at the end that matches the impedance of the source and of
the line itself. Amplitude errors and reflections will otherwise result. Video
is a 75
Ω
system, so a 75
Ω
terminator must be put at the end of the signal
path.
Y
Abbreviation for luminance.