Keysight N9340B Demo Manual page 10

Section 5
Measuring Signal to Noise with Delta Markers
Figure 2. Delta markers
Harmonic distortion is present in any electronic system where a signal travels
through an active device. Communication engineers are extremely concerned
with harmonic distortion. For example, cellular radio systems must be checked
for harmonics of the carrier signal that might interfere with other systems
operating at the same frequencies as the harmonics.
In this section, the 100 MHz signal's harmonics will be located using marker
delta. The marker delta function allows you to easily compare the frequency
and amplitude differences between two signals.
Note: Besides harmonics, you can also measure the amplitude ratio of any two signals present in dBc
using delta markers. The Marker Normal function lets you enter the exact frequency you want the
marker to go. The Delta Marker function lets you enter the exact frequency difference desired and
places the second marker at that point. The amplitude difference is shown in the upper right corner
of the display.
Instruction
Set center frequency and span.
Place a marker at the highest peak on the
display (100 MHz).
Anchor the first marker and activate a second
marker.
Move the second marker to another signal
peak by rotating the knob or entering the
frequency offset.
10
Key strokes
[FREQ], {Center Freq}, [290], {MHz},
{SPAN}, [420], {MHz}
[MARKER], {Peak Search}, {Return}
[MARKER], {Delta}
Rotate the knob, or press [100], {MHz}