Chapter 4
Using Spectrum Analyzer
JD700B Series User’s Guide
105
Total Harmonic Distortion (THD)
The JD700B series can measure the Total Harmonic Distortion using spectrum analyzer. The Total Harmonic
Distortion is defined as the ratio of RMS voltage of the harmonics to that of the fundamental component.
This is accomplished by using a spectrum analyzer to obtain the level of each harmonic with peak detector.
Note that this functionality is not supported when the 28 GHz downconverter is in operation.
Figure 45 Total harmonic distortion screen
Setting fundamental frequency
You need to set the fundamental frequency to measure the total harmonic distortion. Once you set up, it will
automatically collect the harmonic outputs (up to the tenth harmonics as shown in Figure 45) from the
spectrum analyzer and calculate the corresponding THD value (%) and the distortion attenuation (dB).
Procedure
1
Press the
FREQ/DIST
hard key.
2
Press the
Fundamental Frequency
soft key.
3
Enter a value by using the numeric keys. You can also use the rotary knob or the arrow keys.
4
Select the unit:
GHz
,
MHz
,
kHz
, or
Hz
.
The total harmonic distortion screen changes accordingly.
Setting reference level
You can set the reference level automatically or manually to optimize the display of the traces measured, as
you desire.
Procedure
To automatically set the reference level:
1
Press the
AMP/SCALE
hard key.
2
Press the
Auto Scale
soft key.
Each time you press this key, the Y-axis scale changes to be optimized with some margin.
To set the reference or attenuation level manually:
1
Press the
AMP/SCALE
hard key.
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