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Most accurate signal generator

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bdunham7:

--- Quote from: switchabl on March 25, 2024, 05:17:45 pm ---The prize for actual "most accurate signal generator" probably goes to one of the JAWS (Josephson Arbitrary Waveform Synthesizer) developed by several national metrology institutes.

--- End quote ---

Note that even the $550,000 JAWS 2V system would not quite meet the OP's initial accuracy requirement of 1 part in 100,000 over the audio range.   :palm: 

see the top of p. 3

https://www.nist.gov/system/files/documents/2023/01/10/6011.pdf

DaneLaw:

--- Quote from: bdunham7 on March 25, 2024, 06:00:19 pm ---
--- Quote from: switchabl on March 25, 2024, 05:17:45 pm ---The prize for actual "most accurate signal generator" probably goes to one of the JAWS (Josephson Arbitrary Waveform Synthesizer) developed by several national metrology institutes.

--- End quote ---

Note that even the $550,000 JAWS 2V system would not quite meet the OP's initial accuracy requirement of 1 part in 100,000 over the audio range.   :palm: 

see the top of p. 3

https://www.nist.gov/system/files/documents/2023/01/10/6011.pdf

--- End quote ---

Then what would?
Let's help OP get his "most accurate signal generator" that matches his criteria.
A custom jobby build to tolerances by a big brand name, so OP can exchange his TC3 Fnirsi and his 15 USD FG-100 for one of those..
Accuracy matters..!

loop123:

--- Quote from: radiolistener on March 25, 2024, 02:25:32 pm ---I think SDG6022X signal accuracy should be good enough for amateur needs.
https://siglentna.com/product/sdg6022x/

But its performance is not the best. So, if you want better performance, there is may be a sense to look for some specialized signal generator for your needs?

What do you mean when talking "most accurate"? Less noise / less spurs / high dynamic range? 

If you're interested in precise amplitude, then there is a sense to look for RF generator. They have pretty clean sine output and allows to setup calibrated amplitude. But note, all signal generators have fixed output impedance, usually 50 Ω (sometimes there is a switch between 50 Ω and 600 Ω). And if your load is not 50 Ω, then you're needs to recalculate amplitude, that is normal and expected behavior.

--- End quote ---

The use is specifically to test the E1DC Cosmos ADC to see if for example it's 0dB corresponds to 1.7V or 1.8V in its lowest setting (with best dynamic range). Just to test its overall accuracy. My present 2 signal generators don't even produce output where I can be certain it's 1V or 1.5V for example. So I need one where I can produce accurate 1.7V or 1.8V to see which voltage would clip it and establish the baseline because different units vary according to the manufacturer. I didn't know choosing signal generator is that complicated that is why didn't post the entire picture below in the original message. In the following is the -128dB noise floor of my E1DA I tested using REW RTA. My budget for the stand alone signal generator is less than $200. Please recommend which one specifically I should get knowing my requirements. Thanks.

https://e1dashz.wixsite.com/index/cosmos-adc







bdunham7:

--- Quote from: loop123 on March 25, 2024, 09:11:30 pm ---I didn't know choosing signal generator is that complicated that is why didn't post the entire picture below in the original message. In the following is the -128dB noise floor of my E1DA I tested using REW RTA. My budget for the stand alone signal generator is less than $200. Please recommend which one specifically I should get knowing my requirements. Thanks.

--- End quote ---

The models I mentioned would more than suffice but they blow your budget.  The cheap and cheerful FY6900 will mostly likely work just fine, but I couldn't personally guarantee it without testing the unit first.

https://www.aliexpress.us/item/3256802190692386.html

nctnico:

--- Quote from: bdunham7 on March 25, 2024, 09:30:50 pm ---
--- Quote from: loop123 on March 25, 2024, 09:11:30 pm ---I didn't know choosing signal generator is that complicated that is why didn't post the entire picture below in the original message. In the following is the -128dB noise floor of my E1DA I tested using REW RTA. My budget for the stand alone signal generator is less than $200. Please recommend which one specifically I should get knowing my requirements. Thanks.

--- End quote ---

The models I mentioned would more than suffice but they blow your budget.  The cheap and cheerful FY6900 will mostly likely work just fine, but I couldn't personally guarantee it without testing the unit first.

https://www.aliexpress.us/item/3256802190692386.html

--- End quote ---
The UNI-T UTG932E will also work and is generally available from local distributors which helps with warranty issues (or returning it if it turns out to be no good). I have no hands-on experience with the UNI-T UTG932E or the FY6900, but the UTG932E looks like it has a better user interface as well.

But either will be way better compared to the FG-100 according to this review: https://hackaday.com/2018/05/17/review-fg-100-dds-function-generator/ Spoiler alert: the FG-100 is a waste of money.

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