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ESR
97User Manual 1175.7068.02 ─ 12
b) In the "MKR" menu, press the "Marker 3" softkey.
"Marker 3" is activated as a delta marker ("D3 [1]"). It is automatically set on
the next largest harmonic of the signal. The frequency offset and level offset
from marker 1 on the fundamental are displayed in the channel information bar
(see Figure 3-9).
Figure 3-9: Measuring the harmonic suppression of the internal reference generator.
Delta markers D2 [1] and D3 [1] show the offset of the first and second harmonics from
the fundamental.
Reducing Noise
The signal analyzer offers three methods to differentiate the harmonics of a signal from
the noise effectively:
●
Reducing the video bandwidth
●
Averaging the trace
●
Reducing the resolution bandwidth
Reducing the video bandwidth and averaging the traces cause the noise from the ana-
lyzer or the DUT to be reduced, depending on which component is larger. Both averag-
ing methods reduce the measurement uncertainty, particularly in the case of small sig-
nal-to-noise ratios, because the measurement signal is also separated from the noise.
Basic Measurement Examples
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