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Testing the NEW SIGLENT SDG1022X-PLUS, output 100Mhz!!

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2N3055:

--- Quote from: Tankj on December 12, 2024, 04:20:19 pm ---
--- Quote from: newbrain on December 12, 2024, 04:05:14 pm ---Thanks for your tests, I'll be deciding in a few months which AWG to buy and every additional piece of information is useful.

There's one thing that looks a bit odd, though.
According to the data sheet, the harmonic distortion should be lower than -65 dBc for frequencies less than 10 MHz at 0 dBm over 50 Ω - your test conditions.
(Attachment Link)
In many of your pictures, I see values for the 2nd harmonic about 20 dB higher than that.
I can expect some non linearity in the scope front end, but less than what I see.

Maybe changing the vertical scale of Channel 1 to a higher value (200 mV/) would help?

--- End quote ---

Yes, you hit the point.
on the datasheet it also mentions Non-harmonic spurious, which is -70dBc under 50MHz. My test results also seem to be a bit higher.

I don't think its due to the non-linearity of the frontend of scope. The scope has a very good test Results.
But I'll test it as you said and see how it goes.

--- End quote ---

For least distortion, don't stretch signal across whole vertical, but less.
Experiment where you have least distortion..

Tankj:

--- Quote from: 2N3055 on December 12, 2024, 04:11:38 pm ---
You returned it because of color?
It is exactly the same machine AFAIK....

--- End quote ---

Part of it :palm:
plus a cheaper price for SDS1204XHD + SDG1022XPLUS, when the seller didn't want to give full refund. maybe business is hard for him

2N3055:

--- Quote from: Tankj on December 12, 2024, 04:31:18 pm ---
--- Quote from: 2N3055 on December 12, 2024, 04:11:38 pm ---
You returned it because of color?
It is exactly the same machine AFAIK....

--- End quote ---

Part of it :palm:
plus a cheaper price for SDS1204XHD + SDG1022XPLUS, when the seller didn't want to give full refund. maybe business is hard for him

--- End quote ---
Fair enough!

Tankj:

--- Quote from: newbrain on December 12, 2024, 04:05:14 pm ---Thanks for your tests, I'll be deciding in a few months which AWG to buy and every additional piece of information is useful.

There's one thing that looks a bit odd, though.
According to the data sheet, the harmonic distortion should be lower than -65 dBc for frequencies less than 10 MHz at 0 dBm over 50 Ω - your test conditions.
(Attachment Link)
In many of your pictures, I see values for the 2nd harmonic about 20 dB higher than that.
I can expect some non linearity in the scope front end, but less than what I see.

Maybe changing the vertical scale of Channel 1 to a higher value (200 mV/) would help?

--- End quote ---

Did a quick test again, all settings are the same except the vertical scale to 200mV, this time 0.63Vpp on 1.6V full scale.

You are right, the noisy harmonics are gone, all tests met the specified performance. I can get even lower harmonics with 250mV vertical scale after I did the screenshots.

1kHz, all harmonics are under -65dB :-+


1Mhz, highest harmonics are around -64.5dB


25Mhz, -55dB 50Mhz harmonic


1Mhz spurious, under -77dB






Tankj:

--- Quote from: 2N3055 on December 12, 2024, 04:27:16 pm ---For least distortion, don't stretch signal across whole vertical, but less.
Experiment where you have least distortion..

--- End quote ---

Thanks!
I repeat the test, result on previous post. You are definitely right here, the nonlinearity of the scope frontend indeed have a huge impact on this test!

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