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ZVT GUI Reference
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Operating Manual 1145.1084.12 – 30 320
Mixer Power Cal...
The Scalar Mixer Measurement Power Calibration wizard controls the power calibration of the scalar mixer
measurement. A power calibration ensures accurate levels of the mixer input signals (RF and LO source
power calibration) and an accurate power measurement of the mixer output signal (IF source or receiver
calibration). The necessary calibration steps are automatically performed across the entire frequency
range of the active mixer measurement (Define Frequencies).
The mixer power calibration procedure depends on the correction type selected in the Define Scalar Mixer
Measurement dialog.
Mixer Power Cal procedure and example: scalar correction
Due to the different frequency ranges of the input and output signals and the external equipment needed,
the mixer power calibration must be performed in several steps. For a test setup where the RF and LO
signals are provided by port 1 and an external generator, respectively, where the RF signal is swept, the
LO signal is at fixed frequency, and where the swept IF signal is analyzed at port 2, the following test
setups are required:
1. Source power calibration for the RF signal. A power sensor is connected to port 1. The RF power
(red) is calibrated over the selected RF sweep range. As a preparative for step 2 the analyzer also
calibrates the source in the IF frequency range. The correction data for both calibration sweeps is
stored.
2. Receiver power calibration for the IF signal. No external device is needed. The receiver (port 2) is
calibrated in the IF frequency range using the source signal from port 1 (red) calibrated in the first step.
3. Source power calibration for the LO signal, provided e.g. by an external generator. A power
sensor is connected to the generator's RF output (red signal). The analyzer controls the generator. The
generator's RF source power (red) is calibrated at the selected LO frequency. No RF connection to or from
the network analyzer is needed.
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