Quick Start Guide 1302.6163.62 - 04
5.21
R&S ESU
Measuring Harmonics of Sinusoidal Signals
5.4 Measuring Harmonics of Sinusoidal Signals
Measuring the harmonics of a signal is a very common task that can be optimally performed
by using an analyzer.
In the following example, the generator signal with 128 MHz and -30 dBm is used again.
5.4.1 Measuring the Suppression of the First and Second Harmonic of an
Input Signal
1. Reset the instrument.
➢
Press the
PRESET
key.
The R&S ESU is now in the default state.
➢
Press the
SPECTRUM
hotkey.
2. Set the start frequency to 100 MHz and the stop frequency to 400 MHz.
➢
Press the
FREQ
key.
➢
Press the
START
softkey and enter
100 MHz
.
➢
Press the
STOP
softkey and enter
400 MHz
.
The R&S ESU displays the fundamental and the first and second harmonics of the input
signal.
3. For maximum sensitivity, set the RF attenuation to 0 dB.
➢
Press the
AMPT
key.
➢
Press the
RF ATTEN MANUAL
softkey and enter
0 dB
.
4. To average (suppress) the noise, reduce the video bandwidth.
➢
Press the
BW
key.
➢
Press the
COUPLING RATIO
softkey.
➢
Using the arrow keys, select
RBW/VBW NOISE [10]
.
The video bandwidth (VBW) will now always be set to less than the resolution bandwidth
(RBW) by a factor of 10.
5. Activate the marker.
➢
Press the
MKR
key.
Marker 1 will be activated and positioned to the signal maximum (fundamental at 128
MHz). The level and frequency of the marker will be displayed in the marker information
field.
6. Activate the delta marker and measure the harmonic suppression.
➢
Press the
MARKER 2
softkey in the marker menu.
Marker 2 will be activated as the delta marker (Delta 2 [T1]). It automatically appears on
the largest harmonic of the signal. The frequency offset and level offset from marker 1
are displayed in the marker field at the top edge of the screen.
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