Products > Test Equipment
Most accurate signal generator
Fungus:
--- Quote from: loop123 on March 25, 2024, 01:43:02 pm ---For general use for example testing any amplifier or ADC. So what sub $200 is accurate enough?
--- End quote ---
For Audio amplifiers? The Unit-T UTG932e is plenty accurate enough.
(and it's the only sub-$200 generator worth considering, so if that's your budget then... :-// )
radiolistener:
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.
PA0PBZ:
Get yourself a 2nd hand Wavetek 98, 8 digits frequency resolution, 4 digits amplitude, can be had for $100.
https://www.testmart.com/webdata/mfr_pdfs/FLUPR/WAV_98.pdf
Electro Fan:
--- Quote from: loop123 on March 25, 2024, 01:43:02 pm ---
--- Quote from: Fungus on March 25, 2024, 12:34:21 pm ---Signal generators aren't cheap. Those Aliexpress gadgets are toys, as you've seen, they output waves but that's about it.
I think the cheapest signal generator worth owning is the Unit-T UTG932e. That's your baseline for price.
--- Quote from: loop123 on March 25, 2024, 08:40:00 am ---It has to be accurate in 1/100000th or output say 1.00001 V
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Maybe you mean the smallest change you can make in the output, not "accuracy"?
1/100000th is approx. 17 bits so you'd need a generator with 18 bits (or more) to achieve that.
If you really meant "accuracy" then I don't think that exists in a signal generator. If it does, you won't want to pay for it.
PS: You'll definitely get a better answer if you say what you're trying to achieve.
--- End quote ---
Since Im not even sure what amplitude my 2 china signal generator is outputting. I just want something where you can input the voltage and frequency in the led and it would produce accurate output. Just accuracy, not about resolution. For general use for example testing any amplifier or ADC. So what sub $200 is accurate enough?
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The Uni-T UTG generator models are good baseline models to consider as you look at your options.
https://storage.googleapis.com/uni-tdocuments/UTG900E_Series_User_Manual_REV2.pdf
Not 100% sure about your objectives but if you want to build something that is still more accurate and flexible you might consider finding a solid signal generator that has a 10 MHz Reference Input, such as the Siglent SDG1032X, but this alone will set you back about $350.
https://siglentna.com/wp-content/uploads/dlm_uploads/2022/06/SDG1000X_UserManual_UM0201X-E01E.pdf
See on page 4: 10 MHz Clock Input/Output
Then, for about $100-200 you can add a GPSDO, such as some model made by BG7TBL on eBay.
https://www.ebay.com/itm/296236063029?itmmeta=01HSTZB4K00HP2PPEAZA5PW64B&hash=item44f90b9935:g:VRcAAOSw~dFl1E5q&itmprp=enc%3AAQAJAAAA4MtrtctaRljoQ7FmzGN3WVi2l6pgv1PrjLbi0NuhSM6pql7j7%2FqoyB89uRCzMNoK1x7q2qqF8jDl6XJbPSmvasas2NC%2FLGC0n8zpFPfTsgCcPsqYTXZkGMCqsiPEnaxCA5%2BNPzBLAqu7SsAm6%2BedWsAY9%2Ftwa2Rs8%2BCBJDfSr7q5nGRd2PczloEG%2FdH%2BnABJG0aix8aCPaSfPNyhsqMeVzFRv4IjEnkS3XXZtPivapJnUvtBKsPFXodPxHLgBkeH8I%2Bih7gUaWTsOl1YSwDAFR%2F3%2BbmvOOXwfYo4aadWujoH%7Ctkp%3ABk9SR8bJrN_OYw
The GPSDO 10 MHz output connects to the 10 MHz input on the back of the Siglent generator.
Altogether this will set you back about $550 but you should be good to go on flexible and accurate signal frequency management.
Or you could start with the Siglent and see if you want/need the GPSDO.
Hint: what you are looking for is something with a good clock source.
Maybe study oscillators:
https://blog.bliley.com/quartz-crystal-oscillators-guide-ocxo-tcxo-vcxo-clocks
radiolistener:
--- Quote from: loop123 on March 25, 2024, 08:40:00 am ---It has to be accurate in 1/100000th or output say 1.00001 V or has
--- End quote ---
if you want to setup 1 V or 0.00001 V, RF generator can do that, it can even do 0.000001 V or 0.0000001 V.
But it doing it with logarithmic scale, while 1.00001 V requires linear scale with 0.00001 V resolution.
I didn't hear that such generators exists.
--- Quote from: loop123 on March 25, 2024, 08:40:00 am ---frequency accuracy of say 5000.00000 Hz
--- End quote ---
That is 0.002 ppm. Using rubidium frequency standard it can be possible.
But I'm not sure what is the use case for so precise signal? :o
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