| Products > Test Equipment |
| Is my hantek DSO2C10 bad/inaccurate? |
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| powerstroke7.3:
--- Quote from: ataradov on August 31, 2022, 07:20:39 am --- --- Quote from: powerstroke7.3 on August 31, 2022, 07:13:17 am ---some cases they need to be absolutely spot on --- End quote --- If it is mostly DC, then use a multimeter. That's what they are designed for. --- Quote from: powerstroke7.3 on August 31, 2022, 07:13:17 am ---Other times I'm looking at frequency. --- End quote --- Use a scope for that. --- Quote from: powerstroke7.3 on August 31, 2022, 07:13:17 am ---I don't generally bother to look at 12 V unless I'm checking to see if it's there or not. --- End quote --- Multimeter again. --- Quote from: powerstroke7.3 on August 31, 2022, 07:13:17 am ---I do work on radios that have 900 V on the plate. --- End quote --- This is some serious stuff, you need to have proper probes and adapters in either case. --- Quote from: powerstroke7.3 on August 31, 2022, 07:13:17 am ---I picked it up to look at the wave form coming out of the supposed pure sine wave inverter. --- End quote --- And you can do that. That's exactly what scope is good for. But again, proper high voltage probes are required, otherwise you will kill the scope. --- Quote from: powerstroke7.3 on August 31, 2022, 07:13:17 am ---So are there ones that will more accurately measure dc and ac voltage from say 1-40v? With precision? --- End quote --- Not really. You can get 12-bit ADC scopes which will have better resolution, but in your case you would still get only 50 mV resolution. And they are WAY more expensive. So much expensive that I personally would not stick 40 V into them without a really extreme need. If you need to do this, your experiment setup is likely incorrect. Scope is not a measurement tool. None of them are. --- End quote --- yeah ive always used my dvm or a vtvm mostly and frequency counters. Have a hv probe for fluke. 900v dc is no fun. Tends to not feel good. Work with one hand in pocket so it cant cross your heart. Why i avoid working on older radios. I plan to use this to measure ESR of electrolytic capacitors. Should be interesting. But no i didn't plan to use it for measuring voltage. Im used to older scopes that you really have to count lines to guess what the approximate voltage is. My friend claims his FNRSI tablet scope is dead accurate for voltage readings so i thought hmmm. The bad probe really threw me off. But i do think this firmware is less accurate than what it shipped with so maybe ill roll it back. I really wanted the signal generator after i realized these main boards were all the same. I appreciate your time and help. |
| ataradov:
--- Quote from: powerstroke7.3 on August 31, 2022, 07:32:31 am ---Im used to older scopes that you really have to count lines to guess what the approximate voltage is. --- End quote --- It is still the best approach with digital scopes too. It is not that hard and you can "guess" much more accurately than the measuring thing because humans are way better at ignoring noise that does not matter in a specific case. It is helpful to have individual measurements on the screen, but not that multimeter mode. This mode is a gimmick of low end scopes. It is like a transistor measurement mode on a multimeter. --- Quote from: powerstroke7.3 on August 31, 2022, 07:32:31 am ---My friend claims his FNRSI tablet scope is dead accurate for voltage readings so i thought hmmm. --- End quote --- LOL, no. FNRSI are trash. They may seem more accurate because they do a lot of "creative" averaging and other trickery. They are not real tools. |
| pcprogrammer:
--- Quote from: powerstroke7.3 on August 31, 2022, 07:32:31 am ---I plan to use this to measure ESR of electrolytic capacitors. Should be interesting. --- End quote --- To do this there are also dedicated instruments that do a better and quicker job. Even the cheap ones. As ataradov stated a scope is to make signals visible. They are also reasonably good for determining frequency, but accurate voltage levels not so much. --- Quote from: ataradov on August 31, 2022, 07:20:39 am ---You can get 12-bit ADC scopes which will have better resolution, but in your case you would still get only 50 mV resolution. And they are WAY more expensive. So much expensive that I personally would not stick 40 V into them without a really extreme need. --- End quote --- The math shows 10mV if the scope is set to 40V full screen (if this is possible with the volts per div setting of course) 40/4096 = 0,009765625. (8 divisions and 5V/div) But that is nitpicking and I agree that such a scope is very expensive and I would also be very careful with inputting a higher voltage directly into that scope. Don't want to blow up a $10K or plus scope. About the FNIRSI scopes, I wrote this in the Hantek thread too, ataradov is right. They are way bad compared to the Hantek and only show seemingly correct readings due to a lot of software filtering done on the data. And I know this because I reversed engineered the damn thing. Made the schematics for both of the FNIRSI ones and the Hantek, so can also state that the hardware of the FNIRSI is crap compared to the Hantek. The Hantek is reasonable, but also has a lot of software issues, and maybe even some programmable hardware issues. (Within the FPGA used in it) |
| powerstroke7.3:
--- Quote from: pcprogrammer on August 31, 2022, 08:12:57 am --- --- Quote from: powerstroke7.3 on August 31, 2022, 07:32:31 am ---I plan to use this to measure ESR of electrolytic capacitors. Should be interesting. --- End quote --- To do this there are also dedicated instruments that do a better and quicker job. Even the cheap ones. As ataradov stated a scope is to make signals visible. They are also reasonably good for determining frequency, but accurate voltage levels not so much. --- Quote from: ataradov on August 31, 2022, 07:20:39 am ---You can get 12-bit ADC scopes which will have better resolution, but in your case you would still get only 50 mV resolution. And they are WAY more expensive. So much expensive that I personally would not stick 40 V into them without a really extreme need. --- End quote --- The math shows 10mV if the scope is set to 40V full screen (if this is possible with the volts per div setting of course) 40/4096 = 0,009765625. (8 divisions and 5V/div) But that is nitpicking and I agree that such a scope is very expensive and I would also be very careful with inputting a higher voltage directly into that scope. Don't want to blow up a $10K or plus scope. About the FNIRSI scopes, I wrote this in the Hantek thread too, ataradov is right. They are way bad compared to the Hantek and only show seemingly correct readings due to a lot of software filtering done on the data. And I know this because I reversed engineered the damn thing. Made the schematics for both of the FNIRSI ones and the Hantek, so can also state that the hardware of the FNIRSI is crap compared to the Hantek. The Hantek is reasonable, but also has a lot of software issues, and maybe even some programmable hardware issues. (Within the FPGA used in it) --- End quote --- whats the best firmware/ software for my hantek? Some say theres better ones for accuracy |
| ataradov:
You are running into physics limitation. There is no firmware that can solve this. This is like asking what TV can show clear 4K video using VHS tape as a source. The best you can do is average and blur stuff, this is what FNRSI is doing. But this is not adding information. The information was lost after analog to digital conversion happened. But I don't think there is any firmware other than the official one anyway. |
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