Glossary
Glossary- 2
RFA300A Measurement Set 8VSB
Constellation Unit
A unit half of the minimum distance between two digital (8VSB) symbols.
This is illustrated next using the constellation graph of the EVM window.
Note that a constellation unit is half of the minimum distance between two
I-channel constellation levels.
Many measurements are made in constellation units. Unit size remains
constant while the Digital Television signal varies in amplitude.
2 Constellation units
15
10
5
0
--5
--10
--15
7
5
3
1
--1
--3
--5
--7
Frequency Response
The variation of signal amplitude over a channel’s frequency range.
Group Delay
The relative time of propagation of packets of information at frequencies in
the spectrum of a waveform.
Limits Set
A set of caution and alarm parameters against which numeric measurement
results are compared.
Mask
A visual parameter within the graphic portion of the measurement window
against which acquired waveforms are compared.
Peak Transient Power
The maximum value of envelope power occasionally reached by a digitally
modulated signal.
Summary of Contents for RFA300A
Page 1: ...User Manual RFA300A Measurement Set 8VSB 071 0697 01 www tektronix com...
Page 4: ......
Page 10: ...Table of Contents vi RFA300A Measurement Set 8VSB...
Page 102: ...Appendix C System Recovery C 12 RFA300A Measurement Set 8VSB...
Page 108: ...Glossary Glossary 4 RFA300A Measurement Set 8VSB...
