Technical data

336 Chapter 12
GSM and EDGE Analyzer
Using the GSM Analyzer and the EDGE Analyzer
GSM and EDGE Analyzer
displayed results are due to variances in the signal over time.
The Graphics Display contains the graphical view of your measurement. You can
change this view by pressing [Display] and [View], and then selecting one of the
three view options available to you. The three views are:
• Channel Scanner: The graphics display shows channel power. In this display,
the power of each selected channel is shown. The Y-axis labels display the
absolute power (dBm), and dB/division. The X-axis labels display the frequency
or channel number. Channel Scanner in GSM Tx Analyzer and in EDGE Tx
Analyzer both use the ‘Peak Detector’ and therefore the displayed bar height is
the 'Peak power in the acquisition'.
• Power vs. Time with Zoom set to “Slots”: The graphics display shows power
versus time for the channel selected using [Display], then [Position]. In this
display, the power of the channel (or of part of the channel) you selected is
shown against time. The Y-axis labels display the absolute power (dBm), and
dB/division. The X-axis represents time, and shows from 60 μs before the first
of your specified timeslots, up to 60 μs after the last of your specified timeslots.
You can display one or more of the eight slots in the channel of interest. The
number of slots displayed is determined by your Zoom Interval setting. For more
details, see “Setting Zoom Interval” on page 353.
The left-most slot displayed is determined by your Zoom Offset setting. For
more details, see “Setting Zoom Offset” on page 352.
NOTE It is worth noting that regardless of which slot you have displayed in the graphics
portion of the screen, the displayed metrics always refer to the first slot, that is, to
Slot 0.
If the Power versus Time mask is set to On, you will also see a mask indicating
the lower and the upper limits for the channels you are displaying. The lower
limit mask is displayed in yellow, and the upper limit mask in magenta (pink).
The green signal trace must lie between these limits for it to pass the Mask Test.
For more details on the PvT mask, see “Setting PvT Mask” on page 354.
The power in each slot is displayed at the top of the screen, together with the
results of the mask test for each slot. A ‘P’ in a green circle represents a Pass,
and an ‘F’ in a red triangle represents a Fail. Each red triangle has an arrow
beside it that indicates whether it is the upper limit, the lower limit, or both
limits that have failed. A double-ended arrow indicates both upper and lower
limits failed, an arrow pointing up indicates an upper limit failure, and an arrow
pointing down indicates a lower limit failure. These pass and fail indicators are