| Products > Test Equipment |
| Is my hantek DSO2C10 bad/inaccurate? |
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| powerstroke7.3:
Had a bad probe. I was using a probe i bought years ago for my old tek. |
| powerstroke7.3:
--- Quote from: ataradov on August 31, 2022, 06:04:07 am ---I doubt any low end scope would be useful for anything radio-related anyway. Again, from what you shown so far your scope does exactly what it should do. Any other reasonably priced scope would behave the same way. --- End quote --- are they really this bad? Techcorner and all these you tube guys raved about this scope. I have a old tektronix 2247a but it developed a problem where it only works on .1ms to .5ms sec/division. Am i better off with a older tektronix scope? I can find one locally for about 100-200 usd I cant use this thing for anything much as far as i can tell. I cant see how it could be this bad? Im a amateur extra class . I know a little, not much, i work on radios. But i cant imagine using this other than a toy to get a general feel visually :-// |
| ataradov:
--- Quote from: powerstroke7.3 on August 31, 2022, 06:50:59 am ---are they really this bad? --- End quote --- They are not bad. They are just not designed for what you want to do. They are also horrible at hammering nails. --- Quote from: powerstroke7.3 on August 31, 2022, 06:50:59 am ---Techcorner and all these you tube guys raved about this scope. --- End quote --- It is a decent low end scope. But what you want to do is not possible even with higher end scopes, this is not what differentiates them. --- Quote from: powerstroke7.3 on August 31, 2022, 06:50:59 am ---Am i better off with a older tektronix scope? I can find one locally for about 100-200 usd --- End quote --- It depends, but most likely no. Why do you think old Tek scope would be better here? Modern digital scopes are better in almost all possible practical respects. --- Quote from: powerstroke7.3 on August 31, 2022, 06:50:59 am ---I cant use this thing for anything much as far as i can tell. I cant see how it could be this bad? --- End quote --- It is extremely useful for a ton of tasks, but measuring high voltages is not one of them. Scopes in general are not measurement tools, they are for observing waveforms. If this is not what you want to do, then you don't need a scope. There is also a question of experiment setup. For example, why do you need to measure that 12 V? What do you expect to see here? As was described, you may want to measure noise on top of 12 V DC. In this case you can measure DC using a multimeter and use AC coupling to measure the noise. In this case you would need way lower V/div setting, resulting in a much higher accuracy. This is where scope is irreplaceable. |
| powerstroke7.3:
--- Quote from: ataradov on August 31, 2022, 06:58:15 am --- --- Quote from: powerstroke7.3 on August 31, 2022, 06:50:59 am ---are they really this bad? --- End quote --- They are not bad. They are just not designed for what you want to do. They are also horrible at hammering nails. --- Quote from: powerstroke7.3 on August 31, 2022, 06:50:59 am ---Techcorner and all these you tube guys raved about this scope. --- End quote --- It is a decent low end scope. But what you want to do is not possible even with higher end scopes, this is not what differentiates them. --- Quote from: powerstroke7.3 on August 31, 2022, 06:50:59 am ---Am i better off with a older tektronix scope? I can find one locally for about 100-200 usd --- End quote --- It depends, but most likely no. Why do you think old Tek scope would be better here? Modern digital scopes are better in almost all possible practical respects. --- Quote from: powerstroke7.3 on August 31, 2022, 06:50:59 am ---I cant use this thing for anything much as far as i can tell. I cant see how it could be this bad? --- End quote --- It is extremely useful for a ton of tasks, but measuring high voltages is not one of them. Scopes in general are not measurement tools, they are for observing waveforms. If this is not what you want to do, then you don't need a scope. There is also a question of experiment setup. For example, why do you need to measure that 12 V? What do you expect to see here? As was described, you may want to measure noise on top of 12 V DC. In this case you can measure DC using a multimeter and use AC coupling to measure the noise. In this case you would need way lower V/div setting, resulting in a much higher accuracy. This is where scope is irreplaceable. --- End quote --- When doing an alignment on certain radios you're mostly going to be looking at very low voltages reference voltages in that type of thing and in some cases they need to be absolutely spot on for something like a local oscillator or PLL Other times I'm looking at frequency. Which this thing does seem to be pretty good at reading. I don't generally bother to look at 12 V unless I'm checking to see if it's there or not. And unless I'm working on older radios I'm not usually dealing with high voltage but occasionally I do work on radios that have 900 V on the plate. I picked it up to look at the wave form coming out of the supposed pure sine wave inverter when i couldn't get my tektronix to work. had to make sure that it was not a modified sine wave. I have another 24 to 120v inverter that is causing 20db over s9 noise in my radios reciever, so ive used it to look at that dirty thing.I have also used scopes in the past to look at the AC ripple in dirty DC power supply. Ive had several older scopes. Some very old. I didn't figure anything older with a crt could possibly compare. So are there ones that will more accurately measure dc and ac voltage from say 1-40v? With precision? |
| ataradov:
--- 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. |
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