User`s guide

1-59
Making Measurements
Measuring Amplifiers
Coupling Power Between Channels 1 and 2 is intended to
be used with the softkey. You can use the D2/D1 to D2 function in
harmonic measurements, where the analyzer shows the fundamental on channel 1 and the
harmonic on channel 2. D2/D1 to D2 ratios the two, showing the fundamental and the
relative power of the measured harmonic in dBc. You must uncouple channels 1 and 2 for
this measurement, using the softkey set to OFF to allow
alternating sweeps.
After uncoupling channels 1 and 2, you may want to change the fundamental power and
see the resultant change in relative harmonic power (in dBc). off
allows you to change the power of both channels simultaneously, even though they are
uncoupled in all other respects.
Frequency Range The frequency range is determined by the upper frequency range of
the instrument or system (3 or 6 GHz) and by the harmonic being displayed. The 6 GHz
operation requires an 8753ET/ES Option 006. Table 1-3 shows the highest fundamental
frequency for maximum frequency and harmonic mode.
Accuracy and input power Refer to the “Specifications and Characteristics” chapter in
the reference guide. The maximum recommended input power and maximum
recommended source power are related specifications.
Using power levels greater than the recommended values may cause undesired harmonics
in the source and receiver. The recommended power levels ensure that these harmonics are
less than −45 dBc. Use test port power to limit the input power to your test device.
Table 1-3 Maximum Fundamental Frequency using Harmonic Mode
Harmonic
Measured
Maximum Fundamental Frequency
8753ET/ES 8753ET/ES
Option 006
3 GHz 6 GHz
2nd Harmonic 1.5 GHz 3.0 GHz
3rd Harmonic 1.0 GHz 2.0 GHz
COUPLED PWR ON off
D2/D1 toD2 on OFF
COUPLED CHAN ON off
COUPLED PWR ON