Products > Test Equipment

Standardised Way To Test Oscilloscope Screen Update Rate

(1/10) > >>

EEVblog:
As per this video at around 4:00




I'm thinking about a way to come up with the best and/or most easily test screen update rate (NOT waveform update rate).
High speed camera and frame anlaysis is one way obviously.
Comments invited.

boggis the cat:
I am thinking about the purpose of the refresh rate.

Perhaps the screen refresh rate is less important than the ability to display the waveform appropriately – so a waveform with a 'glitch' repeated at different rates could be used to test for this.

Would setting an AWG to generate a glitch at different rates be a way to verify that the 'scope is functional?

EEVblog:

--- Quote from: boggis the cat on April 29, 2024, 06:20:02 am ---I am thinking about the purpose of the refresh rate.
Perhaps the screen refresh rate is less important than the ability to display the waveform appropriately – so a waveform with a 'glitch' repeated at different rates could be used to test for this.
--- End quote ---

Yes, in theory the display refresh/update rate shouldn't matter if the scope is designed to or set up to capture the thing you are interested in. Persistance is one obvious way to do that for example.
But often you are just causally using you Mk1 eyeball probing around, in whcih case you don't want your fast waveform capture rate hindered by a slow display update rate.

nctnico:

--- Quote from: EEVblog on April 29, 2024, 06:26:10 am ---
--- Quote from: boggis the cat on April 29, 2024, 06:20:02 am ---I am thinking about the purpose of the refresh rate.
Perhaps the screen refresh rate is less important than the ability to display the waveform appropriately – so a waveform with a 'glitch' repeated at different rates could be used to test for this.
--- End quote ---

Yes, in theory the display refresh/update rate shouldn't matter if the scope is designed to or set up to capture the thing you are interested in. Persistance is one obvious way to do that for example.
But often you are just causally using you Mk1 eyeball probing around, in whcih case you don't want your fast waveform capture rate hindered by a slow display update rate.

--- End quote ---
This really is a non-issue which has been discussed before. Any form of high-waveform update rate will have a certain amount of persistence time to make sure the signal stays on the screen long enough to be noticed. Think in order of magnitude of 200ms. Anything below is likely to be missed. If you think about it and think back about the relative long fade times of phosphorus used in CROs, you'll come to the conclusion that the display update period can't be a parameter in the process which shows the signal.

tautech:
As you know display HW is different so some HW analysis should reveal the reason for apparently faster display rates in SDS2000X HD.

File convertor in the webserver virtual button is a little app to convert BIN files to CSV.
It can also be downloaded to USB from the Save/Recall menu to be then transferred and installed on PC.

Setting the LAN address requires clicking OK and reopening the LAN menu to see the IP DHCP has assigned.

With mouse plugged into the scrope the scroll wheel is available for making numeric field adjustments.

Navigation

[0] Message Index

[#] Next page