| Products > Test Equipment |
| Most accurate signal generator |
| << < (10/34) > >> |
| nctnico:
--- Quote from: loop123 on March 26, 2024, 11:16:50 am --- --- Quote from: Aldo22 on March 26, 2024, 08:09:13 am --- --- Quote from: loop123 on March 26, 2024, 06:48:42 am ---No. I just wrote 1.00001V to drive the point that it should not be 1.2V or 0.9V but exactly 1V. It doesn't have to be 1.00001V but only 1.01 volt for example. It is enough. With that clarified. I just need a sine wave generator that can produce 1.8V (error of 1.801V) and 5000Hz (not 5001Hz or 4999 Hz). How do you build them anyway? Since I'd rarely use it. My budget for finished product (I want ot avoid building it) is lower to $50.. --- End quote --- You're starting to look like a troll to me. First you have $200 now $50. First you want 10uV error, then you want 10mV error and now 1mV? Anyway, the only halfway complete (new) signal generator for $50 that I know of is the FY3200S. It is what it is. Not nearly what you want, but obviously you don't really know. (Attached an excerpt of the specs for FY3200S) P.S. At least FY3200S has detailed manufacturer specs, which isn't necessarily a given for $50. ;) --- End quote --- The $200 you guys mentioned are so complex with dozens of functions like square waves and even custom waves. I dont need them I just need sine wave so I think I need single $50 accurate sine wave output only. well. I thought its easy to get 1.8000001V accuracy. But it would be too costly or impossible as you guys say. So I need it to be accurate to 1.80V only, that is good enough. Frequency should be like 3000.0Hz accurate. --- End quote --- Unfortunately not. The cheap devices (new or used) are no good. Really get something like the FY6900 or UTG932E. Getting a sine wave out of these is very simple and the level is reasonable accurate (say within 2% of the level at audio frequencies). Good enough to check whether your acquisition system is doing what you expect. |
| gf:
Even your FNIRSI is possibly good enough for your use case. Set the generator to 50Hz sine wave and adjust the output voltage until you mease 1V AC with your multimeter. Then attach a 100 kOhm : 1 Ohm voltage divider and you have a 10µV source. |
| shapirus:
--- Quote from: nctnico on March 26, 2024, 11:49:01 am ---Unfortunately not. The cheap devices (new or used) are no good. --- End quote --- Certainly more than good enough. If we read between lines, then e.g. a JDS2800 should work just fine. The microvolt and microhertz accuracy requirement is an obvious nonsense: the OP seems to not know exactly what he needs. I bet he just needs a basic signal generator that's good enough to be a starting point. Plus, of course, a DMM, one that can measure AC with a reasonable accuracy in the required frequency range, is also needed for fine tuning, and a basic oscilloscope would be nice to have as well. But even without the DMM and oscilloscope, the JDS2800 is decently good, voltage-wise to about 10-30 mV (set 1.8 Vpp, measure RMS; set 5.091 Vpp, measure RMS). Frequency-wise it's even better: match down to 6th digit when measured by Rigol DHO800 (not that they can't be off by the same amount of course -- would need say a GPSDO to verify this). All of the above is valid only as long as we consider any sane practical application, of course. |
| loop123:
--- Quote from: BennoG on March 26, 2024, 08:21:30 am ---The OP probably does not understand that the output load needs to be 50 ohm. If you not load the generator with 50 ohm the output voltage is usually double the output voltage you set on the generator. Or for the el cheapo chinese the unloaded output is the set voltage and as soon as you put a load on the output the voltage drops. Benno --- End quote --- The E1DA ADC has input impedance of 640 Ohm while the Scaler has input impedance of 200k Ohm. What would happen to the signal generator with 50 ohm output impedance in them? My multimeter has this specs up to 500Hz only. What best inexpensive multimeter that can measure at least 10Hz to 20000Hz with accuracy of 1/100000th (ops, i mean just accurate enough in 2.01V or 3000.01 Hz? |
| ebastler:
--- Quote from: loop123 on March 26, 2024, 01:03:08 pm ---My multimeter has this specs up to 500Hz only. What best inexpensive multimeter that can measure at least 10Hz to 20000Hz with accuracy of 1/100000th (ops, i mean just accurate enough in 2.01V or 3000.01 Hz? --- End quote --- As already suggested above, the Uni-T UT61E (or the newer UT161E) comes close, but does not quite meet your most recent requirements: * Specified up to 10 kHz * AC voltage accuracy +- 0.8% up to 1 kHz, +- 1.2% up tp 10 kHz, hence about 2V +- 0.02V (depending on frequency) for your example. * Frequency accuracy is +- 0.01%, hence 3000 Hz +- 0.3 Hz for your example. The UT61E should be available below $100, the newer 161E a bit over $100. The "E" suffix is important! The other UT61 or UT161 variants have significantly worse accuracy and resolution. Maybe there is a "better AC multimeter" in this price range, but I am not aware of one. |
| Navigation |
| Message Index |
| Next page |
| Previous page |