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46 Chapter 2
Operation
Using the Mixers with the 8566B Spectrum Analyzer
Operation
“Harmonic 6L”, where “L” stands for locked, or you could press Shift+z to manually
harmonic lock.
Figure 2-18
TYPICAL MILLIMETER SIGNAL DISPLAY
A menu of millimeter measurement functions is accessed by pressing SHIFT, 1, MHz. Even
though the spectrum analyzer is in an external mixer band, the 8566B spectrum analyzer
retains full operation capability (except for use of the RF input attenuator and preselector).
Amplitude Calibration
Procedure
Each 11970 series harmonic mixer is characterized at the factory and comes with a
calibration chart (See Figure 2-19). The horizontal axis of the chart gives the frequency
range of the mixer and the two vertical axis scales are calibrated in conversion loss and in
reference level offset.
To correct the amplitude calibration of the spectrum analyzer to account for the conversion
loss of the harmonic mixer, press
SHIFT, 1, MHz, which accesses the millimeter menu. Then
press
SHIFT, 5, MHz to access conversion loss entry and key in the appropriate value on the
spectrum analyzer as shown on the mixer calibration chart.
For measurements that span the entire band, choose an average value of conversion loss
from the conversion loss chart. For those spectrum analyzers with date codes earlier than
13.8.86, the conversion loss is changed using the reference level function. Press
SHIFT, then
REFERENCE LEVEL, then key in the reference level offset shown on the right side of the
mixer calibration chart.