APD Mode Operating Instructions 13-13
13.4.3 START (APD)
When the Start button is pressed the sweep between initial and stop
frequency is performed for the period of time related to the value set in the
Search Hold Time field.
When a limit, and the YY Offset are activated, the highest of them, plus
offset, is shown on the graph.
The frequencies overcoming the limit will be investigated in the next steps.
If the YY Offset is set to 0 (disabled) the highest signals will be further
investigated even if they are under the limits.
13.4.3.1 Sweep running
From the upper left corner, the User can see if the Preselector is ON or OFF;
if the Preamplifier is ON or OFF; which attenuation is in use and the
minimum attenuation set (from 0 up to 50 dB).
The RBW for APD measurements must be mandatory set at 1 MHz and the
detector is Peak.
The third line shows the Ref level and the sweeping frequency.
13.4.3.2 Signal by
signal measurements
When the time for sweeping is elapsed the instrument automatically goes
on to the steps in which each of the n frequencies (n is set in the Num. of
freqs parameter) is measured for the period indicated in the Time field of the
Setup page.
For each frequency the display shows a screen similar to the one in the
following picture.
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