Products > Test Equipment

New toy(?) scope Fnirsi DPOX180H, claimed 180MHz/500MSps (May 2023)

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csuhi17:
I apologize for my poor wording and the poor quality of the video.

It is true that there is a lot of noise where I recorded the first video, 100V/m measured with ER02. I don't know how accurate this value is and how much it can be confusing.

I recorded the video again, this time sitting in my car, with a phone that at least has auto focus.

https://youtu.be/Yu_mY6qaujg

Unfortunately, I don't know the language well, I use the translator, I hope I can write intelligibly.

The error appears for me when only one channel is active.
The CH1 channel manages to produce up to this level. The CH2 rarely does it.

I reduce the time to 5ns-50ns and the voltage to 5mv/Div.
I press an ORIG button, then move the trigger line up and press the STO/RET button, while moving the trigger line even higher.

There is a part in the video when I set the voltage of CH1 to 10V/Div and the error is still there.

The error is after 1:30 in the video, I was a bit unlucky before that.
And around 2:30 you can see that when I increased the voltage to 10 Volts.

I first noticed the error when I was looking at the trigger delay in single-shot mode.
None of my scopes behave this way, so I'm interested in what the reason is.

battlecoder:

--- Quote from: csuhi17 on October 02, 2023, 08:30:06 am ---I apologize for my poor wording and the poor quality of the video.

It is true that there is a lot of noise where I recorded the first video, 100V/m measured with ER02. I don't know how accurate this value is and how much it can be confusing.

I recorded the video again, this time sitting in my car, with a phone that at least has auto focus.

https://youtu.be/Yu_mY6qaujg

Unfortunately, I don't know the language well, I use the translator, I hope I can write intelligibly.

The error appears for me when only one channel is active.
The CH1 channel manages to produce up to this level. The CH2 rarely does it.

I reduce the time to 5ns-50ns and the voltage to 5mv/Div.
I press an ORIG button, then move the trigger line up and press the STO/RET button, while moving the trigger line even higher.

There is a part in the video when I set the voltage of CH1 to 10V/Div and the error is still there.

The error is after 1:30 in the video, I was a bit unlucky before that.
And around 2:30 you can see that when I increased the voltage to 10 Volts.

I first noticed the error when I was looking at the trigger delay in single-shot mode.
None of my scopes behave this way, so I'm interested in what the reason is.

--- End quote ---

Ok so after playing with this A LOT, I managed to reproduce the issue but not consistently. It happened to me very rarely, and it was normally after using ORIG and 50% and then moving the trigger line or the waveform manually and re-arming the trigger again, at which point it would do what it's doing to you for a couple of seconds, and then it would behave normally.

So you might be right, there could be something weird there. Maybe the sampling buffer it's just treated as a circular buffer and any remnants of previous readings actually trigger the capture. But that would be me just randomly guessing at this point.

csuhi17:
Unfortunately, it's rare for me when it works well.
with the given setting.
But since I already know about it, I will be able to handle it.
fortunately, there is no such error at 100nS.

I hope it's just some software glitch.

I looked at several waveforms to upload. But the mistake was independent of that.

I am patiently waiting for the next firmware

Nik:
I played more with FNIRSI's custom generator and created in a software some test waveforms that anybody can use by copying attached Captures.zip into FNIRSI's internal disk:

1. Sweep sine 1 to 10. Good stuff to check built-in filters or get frequency response out of something.

2. Peaks to see built-in generator resolution. It can handle just a bit over 20 MHz.

3. Interleaved Hi-Lo to see the highest frequency sine the generator can make.. 44 MHz. Can be used in case if default 20MHz not enough.

As they were made with software, they are precise, ie in wave3 hi and low goes strictly one by one making whole waveform perfectly cycled. In wave1 Sweep sine is also precise as it was generated by a software and values have no noise. In wave 2 there is a pattern where you can see how much you can squeeze built-in generator as there is a pattern with hil-lo-hi samples and lo-hi-lo and single hi and single lo.

It seems generator supports a bit more than 300 samples at low freq, but FNIRSI software has some limitation.

Another thing is upon pressing SAVEW device records upto 48k points into file. 48k points for 5uS/div 1x Probe whereas on screen device shows only 48k/(5us*12divs*2ns per sample)=30k points for that time base and hides others.

infino:
Either the oscilloscope is defective or there is a lot of interference.
You can also short-circuit the input and check.

My oscilloscope stopped charging a couple weeks ago, was the culprit ip2312
Already repaired,  who will face the problem, pay attention, the chip has a ground pad on the body, unsolder with a hot air

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