RIGOL Chapter 2 Performance Verification Test
DG800 Performance Verification Guide
b) Set the start frequency to 5MHz and stop frequency to 30MHz.
c) Set the resolution bandwidth to 3kHz.
5. Use the marker function to make measurements and record the measurement
values of the base waveform and 2
nd
order harmonic. Calculate
[2]
the harmonic
distortion and judge whether it is less than -55dBc.
6. Keep the output impedance of CH1 of DG800 at 50Ω. Set the output waveform
of CH1 as a sine waveform with 20MHz frequency, 0dBm amplitude and 0V
dc
offset.
7. Keep the reference level, input attenuation and resolution bandwidth of the
spectrum analyzer as 10dBm, 20dB and 3kHz respectively. Set its start
frequency to 10MHz and stop frequency to 60MHz.
8. Use the marker function to make measurements and record the measurement
values of the base waveform and 2
nd
order harmonic. Calculate
[2]
the harmonic
distortion and judge whether it is less than -50dBc.
9. Keep the output impedance of CH1 of DG800 at 50Ω. Set the output waveform
of CH1 as a sine waveform with 30MHz frequency, 0dBm amplitude and 0V
dc
offset.
10. Keep the input attenuation, reference level and resolution bandwidth of the
spectrum analyzer as 20dB, 10dBm and 3kHz respectively. Set its start
frequency to 20MHz and stop frequency to 120MHz.
11. Use the marker function to make measurements and record the measurement
values of the base waveform and 2
nd
order harmonic. Calculate
[2]
the harmonic
distortion and judge whether it is less than -40dBc.
12. Repeat steps 1 to 11 to test the harmonic distortion of CH2 and record the test
results.
Note
[2]
: 2
nd
order harmonic distortion = 2
nd
order harmonic measurement value – base waveform
measurement value
For example, when the output waveform frequency of the channel is 10MHz, if the base
waveform measurement value is 0.8dBm and the 2
nd
order harmonic measurement value
is -56.2dBm, the 2
nd
order harmonic distortion = (-56.2) -0.8=-57dBc<-55dBc and the
test result fulfills the specification requirement.
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