Chapter 8
Measure Mode – Basic Tab
QAM Ingress
DSAM Help User Guide
Rev. 001
189
Measurement
Information Area
The QAM type (64 or 256) and channel number appear at the top of
the screen in the right corner. Directly below the channel number is the
channel frequency and channel level information.
In the right corner under the selected channel plan the QAM type (64
or 256) and channel number is displayed. Directly below the channel
number is the channel frequency and channel level information.
Graph
The trace changes only if levels are different from the levels of the
previous trace.
Graph Information
Bar
This area consists of the start, stop and center frequency.
Marker Status Area
The QAM ingress measurement mode also contains an area referred
to as the Marker Status area (below the Graph Information Bar). This
area consists of the marker name (A or B), marker frequency (in MHz),
and measured signal level for the frequencies which the markers are
on. The black square around the letter A or B below the graph displays
the active marker. The delta value (in dB) between the markers is also
displayed.
View Menu
To access different functions and shortcuts to other tests
1
Press the
View
softkey.
2
Using the arrow keys, select one of the following options:
Auto Reference (Shift, 9)
– Enables you to automatically view
measurement results in the best reference setting on the graph.
5 dB/div
or
10 dB/div
– Enables you to adjust the vertical resolu-
tion of the graph for the best viewing.
Peak Hold
– When Peak Hold is enabled, peak values are reset.
NOTE
For information about how to read the graph, see
.
NOTE
For best reference setting results you may need to press the Auto
Reference button up to three times.
21128026 R001 DSAM Help User Guide.book Page 189 Thursday, February 5, 2009 2:02 PM
