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Hantek 2000 series - 2C42/2C72/2D42/2D72

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crsojr:
Olá Microchip grato pela sua resposta. Eu entendi o que você escreveu. Eu me expressei errado. O que acontece é que antes do firmware antigo quando aparecia a opção pico-pico o valor não estava correto.
Ex. Na sinusóide a 60 Hz em 3 db, o valor máximo é o valor RMS x 1,4142. Quando eu coloco o osciloscópio para medir o valor pico-a-pico, que deveria ser 2x, o pico deu errado.
Então atualizei o firmware do 2C42 onde agora ele mostra o MIN MAX, mas ele ainda mostra valores errados ..
Deixei dois vídeos no google drive um com a dica x10 e outro com a dica x100.
Por favor veja.
Existe um verdadeiro multímetro rms com valor sinusoidal onde o valor de pico deve ser rms * 1.4142. Não consigo encontrar nenhum parâmetro para este resultado no osciloscópio.
Pode me ajudar ?
Muito obrigado.
Link:
https://drive.google.com/open?id=1W1cfMEbwGr43AkVJR8kWncV-Ece-XWVc
https://drive.google.com/open?id=1kAwDCebhwv3j2wE-dPbTFaX0BQ7gVX0-

crsojr:
Hello, how are you?
Please could you help me, I saw in your post that you also have a Hantek 2C42. I would like to ask a question if in a sine wave your device correctly marks MAX and MIN? For mine when I have a true rms multimeter and with 2C42 the MAX and MIN value that would be of peak peak is different from that marked by the multimeter and calculated according to grammar.
Can you help me?
Thanks

Microcheap:
This handheld only gives you the peak value of the signal, your multimeter shows RMS values. To simplify, for a sine wave Vrms = Vpeak/sqrt(2).
You were reading 40Vp then, Vrms = 40/1.414 => Vrms = 28V, a little too high but not far from the 22V shown in the multimeter. Now, the reason for this higher value is probably because you are measuring a low frequency signal with AC coupling.
I did a quick test here with my scope and I noticed that for frequencies from around 100Hz to about 40Hz the amplitude of the signal will overshoot a bit with AC coupling enabled (that is a characteristic of the filter in the scopes's front-end). So, try to change the coupling to DC and measure again.

I strongly recommend this article for more details: https://blogs.keysight.com/blogs/tech/bench.entry.html/2018/10/18/when_to_use_ac_coupl-X0K7.html

By the way, you can get the rms and other types of measurement connecting the oscilloscope to a PC and using the software. Just be careful not to damage your equipment when poking mains voltage with the device connected to the USB port of a grounded computer:
https://youtu.be/xaELqAo4kkQ

beltet:

--- Quote from: Microcheap on April 18, 2019, 02:35:23 am ---
--- Quote from: uncle_sem on April 17, 2019, 12:48:28 pm ---so, is it possible to hack 2d42 to make it 2d72?

--- End quote ---

Yes it is, https://www.eevblog.com/forum/testgear/hantek-2c422c722d422d72/msg2220975/#msg2220975 but you will need to open your device and have a ST-Link v2 to reprogram de FW. The procedure is described in a few posts back.

If you try it just make sure to backup your device before do any change.

--- End quote ---

Then I start to wonder if the 2D82auto also have the same hardware and you can just flash the firmware there aswell.
Where do you source the firmware files? And can you provide a link to the forum that you are referring to, as my Google Fu was not enough.
Starting to want one of these especially with the specific car diagnostic feutures.

Microcheap:
I bet that the 2D82 is exactly the same hardware as the other models, the only difference being in the software.

To change the BW  of your scope, you will need a ST-Link and then connect it to the device as described a few msg back in this same thread: https://www.eevblog.com/forum/testgear/hantek-2c422c722d422d72/msg2186756/#msg2186756
Extract the FW, open it with a Hex editor and look for the serial number in it, it will end with "-40" just change it to "-70" save and reprogram the flash memory. Now your handheld has a maximum BW of 70MHz.

I haven't test it yet but I would believe that to unlock the car diagnose features it is a similar process.

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