Performance Verification
4-30 AFG3000 Series Arbitrary/Function Generators Service Manual
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
Figure 4-8.
Figure 4-8: Total Harmonic distortion tests
2. Set up the arbitrary/function generator using the following steps:
3. Set up the spectrum analyzer according to the following table:
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:
Select menu Setting Operation
Function Sine Sine (front)
Frequency 20.00 kHz Frequency/Period (front)
Amplitude Units Vpp TopMenu > Amplitude/Level Menu > -more- >
Units > Vpp
Amplitude 1.00 Vpp Amplitude/High (front)
Channel 1 Output On On (front)
Center Frequency Span RBW
100 kHz 200 kHz 500 Hz
Spectrum analyzer (WCA280A)
50 Ω BNC coaxial cable
CH1 Output
AFG3000 series
BNC(Fe)-N(Ma) adapter
THD
C
n
2
n2=
∑
C
1
-----------------------=
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