AFG1000 Series Specifications and Performance Verification
Total harmonic distortion test
This test verifies the total harmonic distortion (THD) using a spectrum analyzer.
1.
Connect the arbitrary function generator to the spectrum analyzer as shown in
the following figure.
Figure 11: Total harmonic distortion tests
2.
Set up the arbitrary function generator as follows:
a.
Push the Sine button on the front panel.
b.
Press the Freq/Period bezel button to choose Freq. The chosen parameter
will be lighted with white background.
c.
Use the numeric keypad or the general purpose knob to set the
frequency to 20.00 kHz.
d.
Press the Ampl/High bezel button to choose Ampl. The chosen parameter
will be lighted with white background.
e.
Use the numeric keypad or the general purpose knob to set the
amplitude
to 1.000 V
p-p
.
f.
Check that the CH1 On/Off front panel button LED is on. If not, then
the channel output is off. Push the CH1 On/Off button to turn it on.
3.
Set up the spectrum analyzer according to the following table:
Center Frequency
Span
RBW
4.
Set the Ref Level of the spectrum analyzer to 8 dBm.
5.
When the THD cannot be measured directly, it is obtained by using the
following calculation:
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