Functions and Measurements
Making Distortion Measurements
54
2 Set one source (signal generator) to 300 MHz and the other
source to 301 MHz, for a frequency separation of 1 MHz. Set
the sources equal in amplitude as measured by the analyzer
(in this example, they are set to –5 dBm).
3 Set the analyzer center frequency and span:
Press > Preset (With Preset Type of Factory)
Press > Center Freq > 300.5 > MHz
Press > 5 > MHz
4 Reduce the RBW until the distortion products are visible:
Press and
5 Move the signal to the reference level:
Press
Press
> Mkr -> Ref Lvl
6 Reduce the RBW until the distortion products are visible:
Press and
7 Activate the second marker and place it on the peak of the
distortion product (beside the test signal) using the Next
PeaK:
Press
> Delta > Delta (On)
Press > Next Peak
8 Measure the other distortion product:
Press
> Normal
Press > Next Peak
NOTE
The coupler should have a high degree of isolation between the two
input ports so the sources do not intermodulate.
Preset/
System
Frequency
SPAN
BW/
Avg
F
Peak
Search
Marker
BW/
Avg
F
Marker
Peak
Search
Marker
Peak
Search
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