Atec Agilent-E8361A - Manual (Page 57)

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Frequency-offset (Option 080)
This option enables the PNA Series microwave network
analyzers to set the source frequency independently from
where the receivers are tuned. This ability is important
for two general classes of devices: mixers (and convert-
ers) and amplifiers. For frequency-translating devices
like mixers or converters, frequency-offset capability is
necessary for conversion loss/gain measurements (both
amplitude and phase), since, by definition, the input and
output frequency of the DUT are different. For amplifier
measurements, frequency offset capability is required to
measure amplifier harmonics or when using the internal
source as one of the stimuli of an IMD measurement.
Option 080 provides a very basic user interface. The user
may enter multiplier and offset values to describe how
the instrument’s receivers track the source frequency.
While flexible, the user interface requires the user to
calculate the correct values. The frequency-converter
application (Option 083) provides a much more intuitive
and easy-to-use user interface, designed specifically for
mixer and converter measurements.
Reference channel switch (Option 081)
Option 081 adds a solid-state internal RF transfer switch
in the R1 reference-receiver path. The switch allows the
instrument to easily switch between standard S-parame-
ter (non-frequency-offset) measurements and frequency-
offset measurements such as relative phase or absolute
group delay that require an external reference mixer.
The user can set the switch manually or remotely, but
it is best used with the frequency-converter application
(Option 083), where it is controlled automatically during
the vector-mixer calibration procedure.
Scalar-calibrated converter measurements (Option 082)
With a simple setup and calibration, this application
provides the highest accuracy for conversion-loss
(or gain) measurements by combining one-port and
power-meter calibrations to remove mismatch errors.
Option 080 required.
Frequency-converter application (Option 083)
The frequency-converter application adds an intuitive
and easy-to-use user interface, advanced calibration
choices that provide exceptional amplitude and phase
accuracy, and control of external signal sources for use
as local oscillators. A graphical set-up dialog box lets you
quickly set up the instrument for single or dual
conversion devices. This set-up screen also helps you
calculate and choose where mixing and image products
will fall.
Embedded LO measurements (Option 084)
Advanced software tuning that provides absolute
group delay of converters with embedded LOs without
the need for access to a common reference signal. The
measurement result is the same as locking the DUT to
the reference mixer LO. Options 080 and 083 required.
Extended power range and bias-tees (Option UNL)
Adds two 60 dB step attenuators (50 dB for E8361A) and
two bias-tees. A step attenuator and bias-tee set is inserted
between the source and test port one and another set
between the source and test port two.
Add receiver attenuator (Option 016)
A 35 dB attenuator with 5 dB steps (50 dB attenuator
with 10 dB steps for E8361A only) is added between
both test ports and their corresponding receiver. See
page 53 for a basic block diagram.