New 2ch pocket DSO+SG - Zeeweii DSO2512G

[Sham73]

https://www.eevblog.com/forum/testgear/new-2ch-pocket-dsosg-sigpeak-dso2512g/msg5083081/#msg5083081

I have firmware 1.3.0C. Is there an update 1.3.0C+ for it too?

[Sham73]

**Open user calibration function.
How to perform AC Gain calibration:
1. The oscilloscope measures the 2.5V 1Khz sin waveform. Observe the "PKPK" measurement item.
2. Open Menu-> Meas, then press the CH1CH2 button, and then long press the [mV] key to enter the AC Gain calibration mode.
3. The UP DOWN button is used to increase/decrease the CH1 Gain until the "PKPK" voltage is equal to or close to the voltage of the signal generator.
4. The LEFT RIGHT button is used to increase/decrease the CH2 Gain until the "PKPK" voltage is equal to or close to the voltage of the signal generator.
5. Press the OK button to exit and complete the calibration.

How to perform DC offset calibration:
1. The oscilloscope measures the DC power supply. Observe the "Mean" measurement item.
2. Open Menu-> Meas, then press the CH1CH2 button, and then long press the [V] key to enter the DC offset calibration mode.
3. The UP / DOWN button is used to increase/decrease the CH1 dc offset until the "Mean" voltage is equal to or close to the voltage of the multimeter.
4. The LEFT / RIGHT button is used to increase/decrease the CH2 dc offset until the "Mean" voltage is equal to or close to the voltage of the multimeter.
5. Press the OK button to exit and complete the calibration.
Different vertical sensitivities use different calibration parameters, so they need to be calibrated separately.


**add [ZOOM]
Long press the "s" key to turn on/off Zoom mode.
(Zoom is not supported when roll mode or cursor is on\
It is recommended to exit Zoom mode before shutting down to avoid measure item are cleared)

What sources do you use for AC and DC calibration?

[Aldo22]

What sources do you use for AC and DC calibration?

With what I had at hand.
I took my FY3224s and verified the voltage with the multimeter. This for all voltage ranges, but only at 1kHz.
Here is a photo of it: https://www.eevblog.com/forum/testgear/new-2ch-pocket-dsosg-sigpeak-dso2512g/msg5086450/#msg5086450

Today I might do it with my second scope.
But you shouldn't exaggerate, it's not a high precision device. 

[Sham73]

But you shouldn't exaggerate, it's not a high precision device. 

Do you mean FY3224s... or DSO2512G?

[Aldo22]

But you shouldn't exaggerate, it's not a high precision device. 

Do you mean FY3224s... or DSO2512G?

Both of course. 
Both are pretty much the cheapest usable representatives of their kind.
FY3224s has quite good precision (frequency response) up to 10MHz / 10V, but is not very accurate, i.e. the multimeter shows slightly different values in certain voltage ranges from what is set on the FY3224s.
Normal oscilloscopes are rarely very accurate. 2%-5% voltage is normal.
That's OK, just don't overdo the calibration, it won't be like a multimeter.

https://en.wikipedia.org/wiki/Accuracy_and_precision

[tunk]

FY3224s has quite good precision (frequency response) up to 10MHz / 10V, but is not very accurate, i.e. the multimeter shows slightly different values in certain voltage ranges from what is set on the FY3224s.

It may be caused by the multimeter - multimeters also have a frequency range.

[Aldo22]

It may be caused by the multimeter - multimeters also have a frequency range.

Absolutely, that's why I only compared the different voltage ranges at 1kHz and DC.
At 1kHz, the multimeter is quite accurate.
Then you can increase the frequency and look at the frequency response ("hobby accuracy" of course...)

[Sham73]

That's OK, just don't overdo the calibration, it won't be like a multimeter.

For calibration, I need a more or less accurate laboratory power supply and a functional signal generator, which I don’t have.

[Aldo22]

For calibration, I need a more or less accurate laboratory power supply and a functional signal generator, which I don’t have.

It's not really necessary.
You have "Auto cal" in the Aux menu.

[chemary]

That's OK, just don't overdo the calibration, it won't be like a multimeter.

For calibration, I need a more or less accurate laboratory power supply and a functional signal generator, which I don’t have.

If you don't want to spend much, I purchased a cheap device like this one https://www.aliexpress.com/item/1005006786894152.html it comes with a hand written paper with the real measured values with good equipment and also states the date and temperature when they were done, it can be used to know how good are the measures of your equipment.

[Aldo22]

That's OK, just don't overdo the calibration, it won't be like a multimeter.

For calibration, I need a more or less accurate laboratory power supply and a functional signal generator, which I don’t have.

If you don't want to spend much, I purchased a cheap device like this one https://www.aliexpress.com/item/1005006786894152.html it comes with a hand written paper with the real measured values with good equipment and also states the date and temperature when they were done, it can be used to know how good are the measures of your equipment.

That's certainly nice, but only DC (afaics) and you don't really need that kind of accuracy for the scope.
An average multimeter is perfectly adequate as a comparison.
The scope only has to display approximately the same as the multimeter. So not exactly 1.0000V but e.g. with a battery 1.5xV or 9.xxV

But Autocal is also sufficient imo.

By the way, an FY3224s also has a DC mode and you can output -10V to +10V DC. If you compare this with a multimeter, it should be accurate enough as a reference for the scope.
Of course it can do sine, square etc. anyway.

[Sham73]

That's OK, just don't overdo the calibration, it won't be like a multimeter.

For calibration, I need a more or less accurate laboratory power supply and a functional signal generator, which I don’t have.

If you don't want to spend much, I purchased a cheap device like this one https://www.aliexpress.com/item/1005006786894152.html it comes with a hand written paper with the real measured values with good equipment and also states the date and temperature when they were done, it can be used to know how good are the measures of your equipment.

I have such.  I purchased it to determine the accuracy of my Owon B41T+ multimeter.  It only has four values ​​from 2.5 to 10 VDC, so I didn't mention it.

[yrambler2001]

Looks like a new version V10.1-III with firmware v2.0.3-III

[yrambler2001]

looks like they are using ag32vf303cct6 MCU+FPGA
and opa2673 opamp

[Panchez]

I received exactly the same device. From the first minutes it glitches, freezes, reboots. Sometimes immediately, sometimes it can work for 5-10 minutes. It does not depend on whether there is a signal at the input or not. Firmware 2.0.3-III

Now I turned on the generator, while it is working, I hope the glitch is in the new firmware, maybe it will be possible to achieve more or less stable operation in this mode. Of course, it may not be in the firmware, I opened it and looked under a microscope, everything is well soldered.

It is strange that there are no updates on the manufacturer's page.

[ptluis]

I received exactly the same device. From the first minutes it glitches, freezes, reboots. Sometimes immediately, sometimes it can work for 5-10 minutes. It does not depend on whether there is a signal at the input or not. Firmware 2.0.3-III

Now I turned on the generator, while it is working, I hope the glitch is in the new firmware, maybe it will be possible to achieve more or less stable operation in this mode. Of course, it may not be in the firmware, I opened it and looked under a microscope, everything is well soldered.

It is strange that there are no updates on the manufacturer's page.

I advise you to contact the seller immediately and return the device or require a new one. if not possible contact Zeweeii directly maybe they can send you a new firmware. Don't expect firmware updates on manufacturer website because they don't do it. their products are buy and forget improvements type. That's why I quit on them.

[Panchez]

Thanks for the reply ptluis. The return shipping will be expensive for me, I contacted the seller, he compensated me part of the funds. In the end it cost me $30, I can't be without the device now, it works somehow and well, it will suit my purposes. I wrote to Zeeweii, let's see what they answer.
At first glance, the quality is good, although one probe turned out to be non-working, somewhere the central core was broken. Of course, I had no doubts, in any such Chinese there is always something glitchy)
I need to look for something compact with the same parameters, what do you recommend?

[Aldo22]

@Panchez:
You were really unlucky.
I've never heard of a DSO2512G not working at all or being delivered with defective probes.
Did something break during transportation?

If you want a “better” one, I'd say you'll have to pay more.
That depends on your needs.
The cheap scopemeters, which are discussed everywhere, are not really better scopes.

[Panchez]

Package was good. The probe is broken on the side of the clamp, I couldn't figure it out, it's pressed there, in the BNC side everything is fine.
I also looked at the reviews in the store, not a single bad one, either some component is faulty or there is a bug in the new firmware, I calibrated and reset to factory settings, I have not tried it with the second channel turned on yet, maybe it is the firmware, let's wait, maybe the manufacturer will write something, very interesting

https://youtu.be/oXpKu_qTcos

[Aldo22]

https://youtu.be/oXpKu_qTcos[/url]

I've never seen that before.

Btw: Why do you (not just you) always take videos in vertical (portrait) mode?
It looks like this on a monitor:



A smartphone can be rotated without any problems, a monitor or notebook less so.
Why do you do that?

[Panchez]

I filmed horizontally, and it's fine in the player on the computer, but for some reason YouTube didn't want to flip it, apparently it's a matter of the meta tag and resolution in phone

[ptluis]

I filmed horizontally, and it's fine in the player on the computer, but for some reason YouTube didn't want to flip it, apparently it's a matter of the meta tag and resolution in phone

What's the firmware version of your scope?

[Panchez]

Firmware 2.0.3-III

[ptluis]

Firmware 2.0.3-III

I´m sorry but I don't have that firmware version to send you. Are you able to replicate the problem everytime or it's random? contact zeweeii and ask for an email for you to send the video problem.  If they won't reply to you, try this email 1101093749@qq.com  recipient name is kugg. That's the email I used before. I don't know if it´s still valid because I haven't use it for a quite some time.

[Panchez]

Problem is random whith or without singnal may work 5 may 15 minutes/