Products > Test Equipment
New 2ch pocket DSO+SG - Zeeweii DSO2512G
Sham73:
--- Quote from: pcprogrammer on April 26, 2024, 12:18:26 pm ---
--- Quote from: Sham73 on April 26, 2024, 09:58:23 am ---2) I have 2 video capture adapters. One of them is working, the other is not. It turns on when you twist or press the board in a certain way, but not always. Upon careful examination, I did not find any contact failure on the board. Therefore, I want to compare both adapters on an oscilloscope. I want to ask: can I simultaneously check both adapters with both probes, connecting each of them to its own minus, or is this not possible?
--- End quote ---
As long as the 2 video capture adapters share a common ground you will be fine, but make sure the ground of the probes are connected to the same ground potential.
Are these video capture adapters USB devices? If so it is best to connect then to the same computer for performing these tests. Then the ground potentials will be more or less the same. Connecting the probe grounds to the separate devices will cause ground loops and this might lead to incorrect measurements, but the scope you are using is not the most accurate either. >:D
--- End quote ---
Yes, USB adapters - UTV-007. To receive the same signals, I want to connect their RCA connectors through a splitter to one video signal source - an analog video camera or an old Japanese VCR, and USB connectors to a smartphone and tablet. Although, I probably don’t need to connect it to my tablet or smartphone - I think this will not change the signal.
What is its inaccuracy? I thought it was only inaccurate at high frequencies.
pcprogrammer:
--- Quote from: Sham73 on April 26, 2024, 02:07:03 pm ---Yes, USB adapters - UTV-007. To receive the same signals, I want to connect their RCA connectors through a splitter to one video signal source - an analog video camera or an old Japanese VCR, and USB connectors to a smartphone and tablet. Although, I probably don’t need to connect it to my tablet or smartphone - I think this will not change the signal.
What is its inaccuracy? I thought it was only inaccurate at high frequencies.
--- End quote ---
Then it is no problem. The ground will be equal due to the input signal splitter. You will still need to power the adapter to be able to follow the signal through active components.
I don't know what the accuracy of this scope is, but doubt it will be less then 3%. All these cheap Chinese scopes use cheap components and have somewhat crappy designs.
Aldo22:
--- Quote from: pcprogrammer on April 26, 2024, 03:27:21 pm ---I don't know what the accuracy of this scope is, but doubt it will be less then 3%. All these cheap Chinese scopes use cheap components and have somewhat crappy designs.
--- End quote ---
Newer firmware can be calibrated manually.
I once took a few measurements here:
https://www.eevblog.com/forum/testgear/new-2ch-pocket-dsosg-sigpeak-dso2512g/msg5087293/#msg5087293
I think that's quite all right. It's a scope and a cheap one at that.
Sham73:
--- Quote from: Aldo22 on April 26, 2024, 03:44:57 pm ---
--- Quote from: pcprogrammer on April 26, 2024, 03:27:21 pm ---I don't know what the accuracy of this scope is, but doubt it will be less then 3%. All these cheap Chinese scopes use cheap components and have somewhat crappy designs.
--- End quote ---
Newer firmware can be calibrated manually.
I once took a few measurements here:
https://www.eevblog.com/forum/testgear/new-2ch-pocket-dsosg-sigpeak-dso2512g/msg5087293/#msg5087293
I think that's quite all right. It's a scope and a cheap one at that.
--- End quote ---
What is the newest firmware?
Aldo22:
--- Quote from: Sham73 on April 26, 2024, 04:57:01 pm ---What is the newest firmware?
--- End quote ---
I don't know, probably 1.3.0c.
Try this (instructions by ptluis)
**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)
https://www.eevblog.com/forum/testgear/new-2ch-pocket-dsosg-sigpeak-dso2512g/msg5083081/#msg5083081
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