Finally got into the oscope game thanks in no small part to your channel. With recent updates in form factor for machinery diagnostics such as the Hantek and Picoscope products, I now have all the diagnostic power I'll ever need. Cheers!
I have just bought one of these, very impressed. Looking at the manual, the behaviour you describe here might be explained in section 4.3 about acquisition. The different acquisition modes sample the signal in different ways and the sampling rate is also affected by the timebase setting. More or less sample points may be resulting in movement of the trace.
Isn't this down to the memory size of the scope? At the higher timebase you will have fewer points per period of your waveform. If you 'zoom in' to a faster timebase the memory of the scope means it's able to record more information per waveform period so can better rebuild the original waveform using the sinx interpolation. If you're able to switch the view to line or point view, then you can see the actual recordings of the scope and what information it's working with to rebuild the trace on screen. Then see where the points are at the different timebase settings.
@@LockdownElectronics might make an interesting video, assuming the Hantek can switch to a points or linear interpolation display instead of sinx(x)/x?
Looks like a calibration issue to me. Have you try to run a self calibration on the unit after a suitable warm-up time? Other things comes to mind is: Do you have the latest FW on the thing? Have you try to contact Hantek's support with this matter?
Thank you this interesting experiment. I think that many devices are marketed faster than the firmware can keep up. This results in forcing the consumer to find the defects in many of these products. I wonder if a firmware update would remedy the 8 to 20 ns time base dissimilarity?
There is no chance of a multimeter giving a sensible result at those sort of frequencies, however you comment has set me thinking! An RF probe would be able to provide measurements. I have ordered a suitable diode to construct one and see what results I get, hopefully the subject of a future video.....
Hi. That is not the only problem that this scope has. When you change VOLTS/DIV, the voltage reading is changing as well. And that's not all, when you change the Probe Attenuation in conjunction with VOLTS/DIV it also changes the voltage reading. I did many tests on a 5v PC USB power output. Can you confirm that you have the same discrepancy? . . 500mV/Div - Mean - 5.00V 2.00V/Div - Mean - 4.96V 5.00V/Div - Mean - 4.60V 10.00V/Div - Mean - 4.80V 50.00V/Div - Mean - 6.00V . . etc. PS. The vertical position knob changes the volt readings too. 73.
do you have problems with mesuring low voltage signals? 100mv? 10mv? I want ot buy this model, but i have seen other models that have problems with low voltage signals.
In the last two days I watched near all the Hantek videos on TH-cam, because I bought one. And for me it seems that Hantek is a garbage above a few MHz. Everybody said that their functiongenerator are "old, not precise, etc." In every video when they goes above 10MHz the graph on the display starts wobling in amplitude and frequency too. I saw a video where was another scope, a Rhode&Swarz which was rock solid. And I think the Hantek has a huge disability on their converter and or clock generator. What do You think?
@@LockdownElectronics I agree, I have used several, and they all have small glitches, but not the one you showed, which I cannot test (don't have the DOS5102P). The worst is lock up requiring restart, and yes the bandwidth is generally pushing it and not super linear, but still good! I think the other guy is spoilt by hid R&S, and forgets it cost 20x as much (if not more).
Very Interesting. I wonder How the 5102P tracks compared to the 2D72? I guess if you really wanted to test accuracy you could get some crystal oscillators and use your own power supply.
WTF, that is nasty and unacceptable! I hope you contacted Hantek about a scope that should by now be fully debugged. It is widely use and popular, so hopefully Hantek will listen to you. One thought, does it happen if you use the software link via USB as well???????
Finally got into the oscope game thanks in no small part to your channel. With recent updates in form factor for machinery diagnostics such as the Hantek and Picoscope products, I now have all the diagnostic power I'll ever need. Cheers!
I have just bought one of these, very impressed. Looking at the manual, the behaviour you describe here might be explained in section 4.3 about acquisition. The different acquisition modes sample the signal in different ways and the sampling rate is also affected by the timebase setting. More or less sample points may be resulting in movement of the trace.
Agreed, I need to have a more detailed look at the manual.
Isn't this down to the memory size of the scope? At the higher timebase you will have fewer points per period of your waveform. If you 'zoom in' to a faster timebase the memory of the scope means it's able to record more information per waveform period so can better rebuild the original waveform using the sinx interpolation. If you're able to switch the view to line or point view, then you can see the actual recordings of the scope and what information it's working with to rebuild the trace on screen. Then see where the points are at the different timebase settings.
Yes I think you are correct, I was thinking along the same lines recently, however you have put it far more eloquently than I could!
@@LockdownElectronics might make an interesting video, assuming the Hantek can switch to a points or linear interpolation display instead of sinx(x)/x?
Looks like a calibration issue to me. Have you try to run a self calibration on the unit after a suitable warm-up time?
Other things comes to mind is: Do you have the latest FW on the thing? Have you try to contact Hantek's support with this matter?
Thank you this interesting experiment. I think that many devices are marketed faster than the firmware can keep up. This results in forcing the consumer to find the defects in many of these products. I wonder if a firmware update would remedy the 8 to 20 ns time base dissimilarity?
So looking at the graph the scope is more of an 80mhz Oscilloscope?
It would be interesting to compare the voltage "glitch" with a multimeter.
There is no chance of a multimeter giving a sensible result at those sort of frequencies, however you comment has set me thinking!
An RF probe would be able to provide measurements. I have ordered a suitable diode to construct one and see what results I get, hopefully the subject of a future video.....
I’m experimenting the same kind of issue, which recently appeared. .. hmmm
Hi.
That is not the only problem that this scope has. When you change VOLTS/DIV, the voltage reading is changing as well.
And that's not all, when you change the Probe Attenuation in conjunction with VOLTS/DIV it also changes the voltage reading. I did many tests on a 5v PC USB power output.
Can you confirm that you have the same discrepancy?
.
.
500mV/Div - Mean - 5.00V
2.00V/Div - Mean - 4.96V
5.00V/Div - Mean - 4.60V
10.00V/Div - Mean - 4.80V
50.00V/Div - Mean - 6.00V
.
.
etc.
PS. The vertical position knob changes the volt readings too.
73.
do you have problems with mesuring low voltage signals? 100mv? 10mv? I want ot buy this model, but i have seen other models that have problems with low voltage signals.
In the last two days I watched near all the Hantek videos on TH-cam, because I bought one. And for me it seems that Hantek is a garbage above a few MHz. Everybody said that their functiongenerator are "old, not precise, etc." In every video when they goes above 10MHz the graph on the display starts wobling in amplitude and frequency too. I saw a video where was another scope, a Rhode&Swarz which was rock solid. And I think the Hantek has a huge disability on their converter and or clock generator. What do You think?
In my experience, my Hantek scopes were far from garbage. My DSO5102P was an excellent learning tool.
@@LockdownElectronics I agree, I have used several, and they all have small glitches, but not the one you showed, which I cannot test (don't have the DOS5102P). The worst is lock up requiring restart, and yes the bandwidth is generally pushing it and not super linear, but still good! I think the other guy is spoilt by hid R&S, and forgets it cost 20x as much (if not more).
Very Interesting. I wonder How the 5102P tracks compared to the 2D72? I guess if you really wanted to test accuracy you could get some crystal oscillators and use your own power supply.
I am going to do a comparison of scopes, I will include some graphs, I have another scope on route from China!
WTF, that is nasty and unacceptable! I hope you contacted Hantek about a scope that should by now be fully debugged. It is widely use and popular, so hopefully Hantek will listen to you.
One thought, does it happen if you use the software link via USB as well???????