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TRACE
It is important to understand the difference between sweep and refresh.
Sweep
Refresh
WRITE Modes
For the write modes, the analyzer signal response is written into trace memory during the sweep and the memory
contents are displayed on the CRT
Sets all the values in the trace memory A(B) to zero when first activated (bottom line graticule) , then
displays the signal response.
Latest signal response is written into the trace A(B) memory only at the horizontal positions where
the response is greater than the stored response.
When both m A and m B modes are selected, the analyzer writes into (sweeps) A
alternately.
STORE Modes
In the STORE modes, no updating of the trace memory is made. The current memory data is saved.
Example
With TRACE modes, signals can be observed as the analyzer sweeps, can be stored for comparison, erased, or
monitored for frequency drift.
Center and zoom in on a 20 MHz signal:
Press
Since ['s::l has set m A and (,,,.,1 B, only A is
displayed.
NOTE
refers to the spectrum analyzer sweeping from a start frequency to a
stop frequency and storing measured amplitude data into a trace
memory.
refers to the transfer of display memory data to the CRT display.
TRACE MODES
and
B
Manual Operation 37
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