User`s guide

Making Measurements 4
N9340B User’s Guide 53
After the performance of the source/analyzer
combination has been verified, the DUT (device
under test, for example, an amplifier) would be
inserted between the directional coupler output
and the analyzer input.
2 Set one source (signal generator) to 300 MHz
and the other source to 301 MHz. This will
define the frequency separation at 1 MHz. Set
both sources equal in amplitude, as measured by
the analyzer. In this example, they are both set
to –5 dBm.
3 Set the analyzer center frequency and span:
• Press [PRESET] (Factory preset)
• Press [FREQ] > 300.5 > {MHz}
• Press [SPAN] > 5 > {MHz}
4 Reduce the RBW until the distortion products
are visible:
• Press [BW/SWP] > {RBW}, and reduce the RBW
using the knob, the arrow keys or the numeric
keypad.
5 Move the signal to the reference level:
• Press [MARKER] > {Peak Search}
• Press [MARKER] > {Marker To} > {To Ref}
6 Reduce the RBW until the distortion products
are visible:
• Press [BW/SWP] > {RBW}, and reduce the RBW
using the knob, the arrow keys or the numeric
keypad.
7 Activate the second marker and place it on the
peak of the distortion product (beside the test
signal) using the Next Peak:
• Press [MARKER] > {Delta}
NOTE
The coupler used should have a high isolation between
the two input ports to limit the sources intermodulation.