Products > Test Equipment
Most accurate signal generator
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Fungus:
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

--- End quote ---

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.

Fungus:

--- Quote from: DimitriP on March 25, 2024, 12:15:57 pm ---For audio, using a USB audio interface and software will be "cheaper" than buying stand alone instruments.

--- End quote ---

But getting an accurate output voltage won't be easy.
Antonio90:

--- 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

--- End quote ---

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 ---
17 bits ENOB looks to me more like 22-24 bits. Cheap audio interfaces can do that resolution-wise, but not accuracy-wise. It would need high frequency stability, so some kind of hacked-in OCXO or TCXO, and then a low noise amplifier to get the 5Vpp.

loop123:

--- 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

--- End quote ---

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?
ebastler:

--- Quote from: loop123 on March 25, 2024, 01:43:02 pm ---So what sub $200 is accurate enough?

--- End quote ---

Accurate enough for what? What do you want to do with the generator? You mention amplifiers and ADCs -- are these just for audio use, or something more specialised? Do you want to develop audio amplifiers, or repair them? What specifications do these amplifiers have, or what do you have in mind? etc.

As a general comment: It's not "just accuracy". Accuracy is harder to achieve than resolution. E.g. my 3 meter tape measure easily has 1 mm resolution -- I can clearly see the scale lines every mm. But is it accurate to 1 mm? Maybe not; it might actually be 3.002 meters long instead of 3 meters.
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