User`s guide

7-89
Operating Concepts
Knowing the Instrument Modes
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).
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 7-4 shows the highest fundamental frequency for maximum
frequency and harmonic mode.
Accuracy and Input Power
Refer to the 8753ES and the 8753ET specifications and characteristics chapters of the
reference guide for recommendations on the maximum recommended input power and
maximum source power.
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 7-4 Maximum Fundamental Frequency Using Harmonic Mode
Harmonic
Measured
Maximum Fundamental Frequency
8753ET/ES with Option 002 8753ET/ES with Option 002 and Option 006
2nd Harmonic 1.5 GHz 3.0 GHz
3rd Harmonic 1.0 GHz 2.0 GHz
COUPLE PWR ON off
D2/D1 toD2 on OFF
COUPLED CHAN ON off
COUPLE PWR ON off