R&S ZVB - Harmonics Measurements; To Measure a Harmonic of Arbitrary Order N

R&S
®
ZVA / R&S
®
ZVB / R&S
®
ZVT Measurement Examples
Harmonics Measurements
Operating Manual 1145.1084.12 – 30 91
The following example shows how to perform scalar mixer measurements on a differential mixer with
balanced RF input and IF output ports and a single-ended LO input. With a four-port analyzer, a possible
test setup involves the following connections:
 Analyzer ports 1 and 3 to the mixer's RF input port
 Analyzer ports 2 and 4 to the mixer's IF output port
 LO signal provided by an external generator (must be configured in the System Configuration
dialog)
Perform the measurement steps in the following order:
1. Activate scalar mixer mode: Click Channel – Mode – Scalar Mixer – Define Scalar Mixer Meas.
Select the external generator as LO source and define the RF frequency range.
2. System error correction: Connect a calibration to the four (single-ended) analyzer ports and
perform a full four-port (UOSM) calibration.
3. Power calibration: Perform a source power calibration at ports 1 and 3 (one power calibration for
each true differential port).
4. Activate true differential mode: Open the Balanced Ports and Port Groups dialog as described
above, combine ports 1 / 3 and ports 2/ 4 to balanced ports, and enable true differential mode.
5. Measurement: Connect the DUT and measure the desired balanced or mixed mode S-
parameters (Trace – Measure...).
Harmonics Measurements
In the Harmonic Distortion menu you can measure arbitrary harmonics or ratios between harmonics and
the fundamental wave (harmonic distortion factor).
To measure a harmonic of arbitrary order n...
1. Reset the analyzer to ensure that the following operating mode is set: Sweep Type: Lin.
Frequency, Trace - Meas.: S21, Trace - Format: dB Mag.
2. Open the Channel - Stimulus menu and reduce the Stop frequency to the maximum frequency of
your analyzer divided by n where n is the order of the harmonic you want to measure.
3. Click Channel - Mode - Harmonics - More Harmonics. In the dialog opened select the Harmonic
Order you want to measure.
4. Adjust the Source port and the receive port (Harmonics Measured at) to your test setup (for a
DUT connected between port 1 and 2 of the analyzer you can keep the default settings).
5. Close the More Harmonics dialog to enable the harmonics measurement and observe the
changed default trace Trc1.
The trace shows the nth harmonic as a wave quantity b
2
. The measured quantity is changed automatically
when the harmonics measurement is enabled.
Use 2nd Harmonic Port1 to Port2 and 3rd Harmonic Port1 to Port2 to activate the measurement of the
second and third harmonics with a single menu command.