Rohde & Schwarz 1145.1010.04/05/06, Руководство по эксплуатации

Страница: 329 / 813

R&S
®
ZVA/ZVB/ZVT Channel Menu
1145.1084.12 4.167 E-6
Always select the balanced port configuration before defining port groups. When a new balanced
port is created, the analyzer deactivates Simultaneous Measurement of Port Group and deletes all
existing port groups.
Remote control: SOURce<Ch>:GROup<group_no> <log_port1>,<log_port2>
SOURce<Ch>:GROup<group_no>:CLEar [ALL]
Harmonics
The Harmonics submenu controls the measurement of arbitrary harmonics or ratios between harmonics
and the fundamental wave. Together with the Mixer measurement and the arbitrary configuration of
generator and receiver frequencies (Port Configuration), the harmonics measurement is included in
option R&S ZVA-K4.
Harmonics Measurements
Harmonics are signals at an integer multiple of the fundamental frequency. The fundamental is the first
harmonic, the n
th
harmonic is n times the frequency of the fundamental. The production of harmonic
frequencies by an electronic system when a signal is applied at the input is known as harmonic
distortion.
The purpose of the Harmonics menu is to measure the harmonic distortion of a DUT. To this end the
source remains at the fundamental frequency whereas the receiver is set to n times the fundamental
frequency. Two different types of results are provided:
•
In the direct measurement, the n
th
harmonic of the stimulus signal is measured. The result is
displayed as a wave quantity but can be modified and converted using the functions in the
Trace menu.
•
In the relative measurement, the n
th
harmonic of the stimulus signal is divided by 1
st
harmonic
(fundamental) received from the DUT. The result corresponds to the n
th
harmonic distortion
factor.
Harmonic distortion measurements can be performed irrespective of the sweep type: A frequency
sweep yields the harmonics as a function of the frequency, a power sweep yields the power-dependent
harmonics at fixed frequency.
•
2nd Harmonic Port 1 to Port 2... activates the measurement of the second harmonic at port 2
with port 1 as source port.