Chapter 10 Measure Mode – Spectrum Tab
Upstream Spectrum
DSAM Help User Guide Rev. 001 251
Measurement
Information Area
The Measurement Information Area displays the overall pass/fail indi-
cator and information about the frequency currently selected by the
active marker. If Peak Hold is active, a Peak Hold icon is displayed. If
zoom is active, a zoom icon is also displayed. The right side of the
Measurement Information area displays the marker frequency.
Noise Peak
The Noise Peak is the highest point in the trace over the duration of
the measurement. If measurements (including peaks) at all frequen-
cies appear below the hash lines, a Pass icon is displayed at the top
of the screen.
Frequency Range
The Frequency Range in this mode is 4-45MHz (North America) or 4-
65MHz (International), with the start and stop frequencies indicated on
the horizontal bar at the bottom of the screen. As you move the marker
across the frequency range with the left or right arrow key, the numeric
frequency and level value is displayed below the graph. Use the up
and down arrow keys to adjust the reference level from -70 to +65
dBmV in 1dB increments.
Graph Information
Bar
This bar displays the lowest and highest frequencies measured.
Limit Check
When limit check is enabled, black/white diagonal hash lines indicate
the configured limit boundary area.
Viewing Upstream
Spectrum Results
To view upstream spectrum results
1 Press the View softkey.
Figure 228 Measure – Upstream Spectrum
Frequency Range
Limit Check
Noise Peak
Graph Information Bar
Measurement
Information Area
21128026 R001 DSAM Help User Guide.book Page 251 Thursday, February 5, 2009 2:02 PM
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