Agilent Technologies 8753ET User Manual page 70

Making Measurements
Measuring Amplifiers
Figure 1-47 Gain Compression and 2nd Harmonic Output Level
Understanding Harmonic Operation
Single-Channel Operation You can view the second or third harmonic alone by using only one of the
analyzer's channels.
Dual-Channel Operation To make the following types of measurements, uncouple channels 1 and 2, and
switch on dual channel.
• The analyzer measures the fundamental on one channel while measuring the second or third harmonic
on the other channel.
• The analyzer measures the second harmonic on one channel while measuring the third harmonic on the
other channel.
• Using the
COUPLED PWR ON off
while measuring the second or third harmonic in dBc on channel 2.
• Using the
COUPLED PWR ON off
This is useful when you are using the D2/D1 to D2 feature because you can change fundamental power
and see the resultant change in the harmonic power.
The analyzer shows the fundamental frequency value on the display. However, a marker in the active entry
area shows the harmonic frequency in addition to the fundamental. If you use the harmonic mode, the
annotation H=2 or H=3 appears on the left-hand side of the display. The measured harmonic cannot not
exceed the frequency limitations of the network analyzer's receiver.
1-56
feature, the analyzer measures the fundamental on channel 1
feature, the analyzer couples power between channels 1 and 2.