chip is an employee. He’s showing us what we might get for New Year’s.
Hi fellows,
Is there solution for offset calibration saving problem yet? I tried to calibrate my quad (2.5/1.5) with probes earthed at least 20 times now and nothing seems to help! For example with 10V/div: Min = 0V and Max = 5,4V after calibration 
So, have you fellows found this issue or have I pushed wrong buttons ???
THX
I would also like to know this. No matter how much calibration I do, I cannot even get a channel to read 0V when I connect the probe to ground. It is always 1-2V. Along with an incorrect voltage reading in general, the device is pretty worthless at the moment.
I strongly propose you guys to solve this problem first as quad should be an oscilloscope!
Please, focus you ideas for tetris etc. unnecessery after we first have an full functioning oscilloscope!
Is this a feature of quad which cannot solve? Because if it is, I have to purchase a OSCILLOSCOPE!
So, does anyone have ideas for this?
details (pictures) what signal you submitted, and that you are not satisfied. maybe I can help. My DSO is working properly
- Both analog channels probes (x1) was eathed. Probe earthing crocodile to probe tip.
- Automatic calibration sequence was started with “stop” button (2 s).
- Sequence was completed and all levels achieved Zero.
- All asked volts was added to each level and fine tuned to same as digital volt meter reading.
- Calibration saved as asked (“Press “stop” to confirm the re-calibration CH-A”)
APP ver 2.5
SYS ver 1.5
???
THX!
I carried out the calibration of channels A and CH-CH-B. But now, with no signal, DSO measuring about 0.2-0.3 Vdc.
The range of scale is correct
Tnx
channels were displayed in the middle of the screen before calibration?
mode AC or DC ?
Not sure about line at display before cal. Ater it was at middle I suppose.
Mode was DC I suppose.
Why? Should I try AC?
I just tried with ac and 10v/div… Result was the same…
- Both analog channels probes (x1) was eathed. Probe earthing crocodile to probe tip.
- Automatic calibration sequence was started with “stop” button (2 s).
- Sequence was completed and all levels achieved Zero.
- All asked volts was added to each level and fine tuned to same as digital volt meter reading.
- Calibration saved as asked (“Press “stop” to confirm the re-calibration CH-A”)
two points are not clear.
photo with the correct calibration
and more, 8 bits = 255 values.
10v/div *8div = 80V
accuracy 80/255 = 0.3V
(without ofset)
WTF!
Is this 150 bucks oscilloscope or what!! At least quad was sold to me as an revolutionary oscilloscope. I was waiting some more than this!
I apologies my thoughts…
Please. answer my offset problem!
I apologize but I do not understand the language (I use google translator). So it is normal to see 0.2 to 0.3 volts in the absence of signal with the probe grounded?
I agree with chip. The published calibration procedure does not agree with the results shown on the screen. 
It is difficult to tell if the calibration is stored successfully or is complete.
Being a great engineer with good language skills is a rare combination.
You need to get a document writer with good English skills to review the docs. How about publishing a YouTube video on V2.6 calibration?
I downloaded the update FPGA_V2.5
I read in the manual which is not recommended to do this update.
What is it?
It should do so or to avoid?
thanks
I very much doubt that this is a limitation, my friend’s DSO nano v2 measures exactly 0V when the probe is grounded. According to him he has never calibrated it.
Thanks for the reply, I did the calibration several times, successfully, saving the parameters, I’m writing a manual in Italian (14 A4 pages!) of this oscilloscope and I can say to use it well.
The lowest flow rates (and not on the 10V/div) do not give 0.00V with the probe grounded. However, I still repeat the calibration.
Tnx
PS: The official manual v.0.92b explains that the internal generator can provide a square wave with adjustable duty cycle, but I do not find it anywhere this duty cycle regulation.
