UNI-T UTS3000B/A Series User Manual page 35

The harmonic distortion component is generated by this signal at the input mixer of the spectrum
analyzer (lined up sequentially with the original 200MHz signal at 200MHz intervals).
4. Change the center frequency to the frequency value of first harmonic:
Press [Peak]>Next PK
Press [Marker]>Marker→>CF
5. Set sweep span to 50MHz, and redisplay the signal at the center of the screen:
Press [FREQ]>Span>50MHz
Press [Peak]>Marker→>CF
6. Set the attenuation to 0dB
Press [AMPT]>Attenuation>0dB
7. To recognize whether the harmonic wave component is generated by spectrum analyzer, display input
signal at trace 2 firstly:
Press [Trace]>Select Trace>Trace2
Press [Trace]>Trace Type>Clear/Write
Press [Trace]>Update>On
Press [Trace]>Display>On
8. Refresh trace 2 (sweep two times at least) and save the data of trace 2. After that, place a marker at
harmonic component of trace 2:
Press [Trace]>Update>Off
Press [Peak]
Press [Marker]>Marker Mode>Delta △
The spectrum analyzer shows the stored waveform data of trace 2 and being measured data of
trace 1. The reading of △Mkr1 is the amplitude difference between the reference marker and the
activated marker.
9. Increase radio frequency attenuation to 10dB:
Press [AMPT]>Attenuation>10dB
Please note that the reading of △Mkr1, this reading is amplitude difference of the same harmonic
distortion component at the input attenuation is set to 0dB and 10dB.
Figure 3-16 Harmonic Distortion
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