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Siglent SDG2082X THD Measurements

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Conrad Hoffman:
Those levels are pretty low, maybe on the order of what I saw in my THD residual. Might be supply but I'd hesitate to assign blame without seeing a schematic. So far I've no complaint about the cleanliness of the waveforms for any practical use.

blackdog:
May I also play along?  :-DD

I did some measurements on my two Siglent function generators and that is the SDG1032X and the SDG2042X.

From both generators I did the Spectrum measurements at 1 and 3V when the generator is terminated with 50 Ohm.
The two measurement frequencies are 1KHz and 10 KHZ.
The measurements were done with a QuantAsylum 403 Audio Analyzer, software

The spectrum window is Blackman-Harris, there is 5x averaging to make the noise floor a little lower and the spurs are more visible as a result.
The SampleRate is 192KHz, 384KHz is not possible for now, then I have to modify the configuration file and I have not done that yet on this measuring computer.
This higher Sample frequency is also not really necessary for these measurements.

The first picture is the noise floor when the SDG1032X output is disabled.
I left the markers for the 10KHZ signal for a moment.

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Let me start with the SDG2042X at 1KHz and 1V RMS at a 50 Ohm load.

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The SDG2042X at 1KHz and 3V RMS at a 50 Ohm load.

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Tthe SDG2042X at 10KHz and 1V RMS at a 50 Ohm load.

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The SDG2042X at 10KHz and 3V RMS at a 50 Ohm load.

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The following measurements were made on the Siglent SDG1032X.

The SDG1032X at 1KHz and 1V RMS at a 50 Ohm load.

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The SDG1032X at 1KHz and 3V RMS at a 50 Ohm load.

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The SDG1032X at 10KHz and 1V RMS at a 50 Ohm load.

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The SDG1032X at 10KHz and 3V RMS at a 50 Ohm load.

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And now for a nice picture to show how nice the square wave of the SDG1032X is.
This was taken at a 10Hz frequency, Look how beautifully flat the harmonics are.

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Kind regards,
Bram

2N3055:

--- Quote from: blackdog on December 03, 2024, 10:06:55 pm ---

--- End quote ---

And it is your fault that I have to buy QA403 now.... :-DD

KungFuJosh:

--- Quote from: 2N3055 on December 03, 2024, 11:15:49 pm ---And it is your fault that I have to buy QA403 now.... :-DD

--- End quote ---

I've been resisting that for at least a couple years. 🤣

Conrad Hoffman:
Same here but I'm sure you've heard that resistance is futile.

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