Instructions
Page 26 
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 










