| Products > Test Equipment |
| Most accurate signal generator |
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| bdunham7:
--- Quote from: loop123 on March 25, 2024, 01:43:02 pm ---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? --- End quote --- Any reasonable DDS-based AWG (arbitrary waveform generator) is probably what you are looking for, but your stated accuracy requirements are not as easily achieved. I'd suggest not just randomly picking numbers when you make a request like that and instead figure out what accuracy you really need. For testing an audio amplifier a 0.3dB accuracy, which corresponds to about 3% voltage error, should be good enough and is easily achievable by inexpensive AWGs. For testing an ADC, that depends on exactly what testing you are doing. For frequency accuracy with a sine wave, it should be easy to achieve <50ppm error, but you seem to be implying that you want an accuracy of better than 1 in 500 million, or 2ppb, which would be unreasonably difficult for an inexpensive AWG. IDK about under $200, but the Siglent SDG810 is $239 and seems to do what you need (but not what you stated originally). https://siglentna.com/wp-content/uploads/dlm_uploads/2017/10/SDG800_DataSheet_DS02008-E02D.pdf Other more expensive AWGs may have better specs if you actually need them. The Siglent SDG2042X that I have is roughly 1ppm and 0.1dB. Getting better than that starts to cost real money. |
| voltsandjolts:
--- Quote from: radiolistener on March 25, 2024, 02:55:26 pm ---But I'm not sure what is the use case for so precise signal? :o --- End quote --- The OP is "experimenting" in electrical signals of the human body, see other nonsense threads. |
| nctnico:
Cheap and super accurate don't go well together. When you need accuracy, you'll need a levelled signal generator like the ones being used to calibrate oscilloscopes. There is an HP / Agilent generator model with accurate outputs but I can't remember the model number. |
| switchabl:
--- Quote from: nctnico on March 25, 2024, 04:50:05 pm ---There is an HP / Agilent generator model with accurate outputs but I can't remember the model number. --- End quote --- You may be thinking of the 3245A Universal Source. The headline spec for AC amplitude accuracy is 0.4% which would be roughly on par with an APx555. 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. |
| Fungus:
--- Quote from: voltsandjolts on March 25, 2024, 03:37:15 pm ---The OP is "experimenting" in electrical signals of the human body, see other nonsense threads. --- End quote --- Oh... I did wonder about somebody posting those requirements along with a picture of a FNIRSI. |
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