Instructions

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The measurement markers normally operate on the Live trace. However, the Live and View
traces can be “swapped” by pressing the Swap key. This stops the sweep and causes the View
trace to be placed in front of the Live trace. When the traces are swapped, the measurement
markers operate on the View trace.
When the sweep is re-started (or the Swap key pressed again), the View and Live traces are
swapped back.
Either the Live trace or the View trace can be saved to a trace file (see section 5.1).
The Reference trace is purple and is always underneath the other traces if they are on. The
reference trace is created by recalling a trace file from the memory. Measurement markers
cannot be used on a Reference trace.
Note that the View and Reference traces relate to the frequency span, RBW and level settings
that existed when they were stored. Changing these parameters will result in the graticule
values and annotations no longer being correct for these traces.
However, it is possible to recall a Reference trace along with its State. This restores the
frequency span, RBW and level settings that existed when it was stored (see section 5.1).
4.5.2 Sweep Progress Indicator Line
There are two modes by which the live trace is updated from the sweep. For sweep times
below approximately 1 second, the trace is updated at the end of the sweep. For longer sweep
times, the trace is updated continuously while the sweep is taking place.
In this latter mode a yellow line appears at the bottom of the graticule indicating the progress of
the sweep through its span.
4.5.3 Setting the Trace Writing Mode
provides control of the way in which the sweep is written to the Live trace. Creates
a set of bottom-row function keys as follows:
each frequency point of the trace is written with the amplitude obtained from the
current sweep.
the trace is written with the highest amplitude value found for each frequency point
since the sweep mode was selected and sweeping commenced.
the trace is written with the average amplitude value over a number of sweeps.
operates in both Average and Peak hold modes and re-starts the averaging or peak
hold process from zero.
opens a second set of action keys which are only active when either Peak Hold or
Average have been selected, as detailed below:
this is the default mode in which the “processed” trace (Peak Hold or Average) is
displayed in place of the Normal trace.
enables the Normal trace and the “processed” trace (Peak Hold or Average) to be
displayed simultaneously – see section 4.5.3.1. The default is for the Normal trace
to be displayed in front of the “processed” trace.
Trace
Mode
Normal
Peak
Hold
Average
Reset
-more-
1 of 2
Single
Trace
Dual
Trace