1- 57
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.
Ta ble 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.
Tab le 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
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