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EOSC10Kv3 - LT AN67 10kHz oscillator : new updated version !
EOSC10Kv3 - LT AN67 10kHz oscillator : new updated version !
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Old 27th March 2020, 03:16 PM   #141
Frex is offline Frex  France
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Join Date: Nov 2009
Hello,

What is output level of the oscillator ?
Did you have tried to lowered it to show how THD change ? (by turning front panel trimmer).
Do you have strictly followed the adjustment procedure of the oscillator ? (in the deign folder).
Regards.

Frex
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Old 27th March 2020, 03:26 PM   #142
lemon is offline lemon  Greece
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Join Date: Apr 2009
At the first, you must forget the Spectrum FFT of your oscilloscope. The 8bit is very limit for that.

The Radford is the DMS4? I don't know if this is capable to achieve 0.00001@ THD (-140dB) measurement at the range of 10KHz-100KHz. I see at technical papers of DMS4, a noise level a little better from 96dB, at the 10-100KHz range for the input voltage range of 1-10V

The 10KHz signal wants 6-8 measurements above the fundamental frequency (i.e 20-30-40-50-60-80KHz) to measure the THD with accuracy.
Please, repeat the measurement with the Radford only and a range of 10-100KHz.
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