178 Chapter 8
Hardware Options
Verifying Option 122 or 140, Wide Bandwidth Digitizer
Viewing the wide band response to a comb signal
(inner loop test):
The wideband IF is only accessible in the Basic instrument mode.
1. Press
Mode, Basic
2. Press Meas Setup, IF Path, Wide. This selects the wideband IF path.
3. Press
Input/Output, Input Port, IF Align.
4. Press
IF Align Signal.
5. Press
Signal Type and select Comb The comb signal stimulates the
entire 80 MHz IF bandwidth (for Option 122) or 40 MHz IF
bandwidth (for Option 140).
6. Press
Meas Setup, Res BW and type in 150kHz
You will see a display of the internal comb signal that is generated on
the A7 Wideband Analog IF assembly and sent through both the Analog
IF assembly and the A32 Wide Band Digital IF assemblies. We will call
this the inner loop test since it is contained inside the wideband Analog
IF and Digital IF assemblies only. Disregarding the center tone, all
comb teeth should be within 15 dB of each other, and at least 20 dB
above the noise floor. See Figure 8-5 below. Also see the chart on page
180.
Figure 8-5 Comb Teeth
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