Products > Test Equipment
New toy(?) scope Fnirsi DPOX180H, claimed 180MHz/500MSps (May 2023)
radiolistener:
--- Quote from: ptluis on September 22, 2023, 11:39:05 pm ---instead of solving the problems this model has, they insert the "old" one into a new dress and try to fool everybody into buying another one with the same bugs :palm:
--- End quote ---
this is not a bug, this is a feature :)
ptluis:
--- Quote from: radiolistener on September 25, 2023, 06:26:33 pm ---
--- Quote from: ptluis on September 22, 2023, 11:39:05 pm ---instead of solving the problems this model has, they insert the "old" one into a new dress and try to fool everybody into buying another one with the same bugs :palm:
--- End quote ---
this is not a bug, this is a feature :)
--- End quote ---
:) :palm:
csuhi17:
I don't know how legitimate this method is.:
Fnirsi's sampling is 500Ms/s, i.e. there are 2ns between two samples.
The storage/memory depth is 120kp, that is, if you make a single shoot in 20us/div from a 50Mhz color signal, it should be smooth.
But if you zoom in on it
There is 10ns between two points and the total length of the signal is 20us*12div, that is, it is only 24k samples.
If you don't watch it in 20us/div, but in 200us/div, you will see it better with a 5Mhz signal.
I couldn't insert the picture into the text, 16 belongs to 18 and 19 to 20
battlecoder:
--- Quote from: csuhi17 on September 26, 2023, 04:45:42 am ---I don't know how legitimate this method is.:
Fnirsi's sampling is 500Ms/s, i.e. there are 2ns between two samples.
The storage/memory depth is 120kp, that is, if you make a single shoot in 20us/div from a 50Mhz color signal, it should be smooth.
(Attachment Link)
But if you zoom in on it
(Attachment Link)
There is 10ns between two points and the total length of the signal is 20us*12div, that is, it is only 24k samples.
If you don't watch it in 20us/div, but in 200us/div, you will see it better with a 5Mhz signal.
(Attachment Link) (Attachment Link)
I couldn't insert the picture into the text, 16 belongs to 18 and 19 to 20
--- End quote ---
Well it sounds reasonable to me.
I tried to measure similarly, but under different parameters, and got the same results.
I single-trigger captured 240ms of a 1Mhz waveform (i.e: A full screen of data (12 divisions) at 20ms per division).
Then I zoomed in horizontally until I was able to measure the distance between data points. At 10uS I was getting exactly 1 data point per division. In fact, the oscilloscope didn't let me to go finer than 10uS per division (probably because at that point I was already at one data point per division).
So, 240 ms of waveform = 240000 us of data .... divided by 10us of separation between points = 24K points.
Rooster Cogburn:
I found myself wishing on multiple occasions that I could scroll around more. The triggering options are so limited (no holdoff, no pulse triggers, no video triggers etc.) that it would be at least nice to have more memory so I can still see the part I was interested in.
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