Is is possible to find a Displays actual refresh rate?

A better solution would be something like the judder test patterns.


However I believe most of those are set up for testing 24 FPS material so wouldn't necessarily tell you if you were running at 48 or some other multiple.


The HTPC forum might be a better place to check.

Some instruments will measure the display refresh rate. My PR-670 does this. Some less expensive tools like a CA-6X offer this feature as well. Judder is very difficult to confirm with visual test patterns. Measuring display refresh rate is a much better way to go.


It is a useful feature to determine if a display is really running a multiple of 24 Hz. Just because a display synchronizes with a 24 Hz source does not mean it is not converting it to 60 Hz.

The Spyder2 can return a refresh rate, but I am not sure how accurate it is, and none of the software packages I know of display it in the user interface. You would need the SDK and custom code to do it.

Ahh, interesting.


Thanks!

A photo-diode, amp, and oscilloscope can measure it... Even a pixels rise/fall time can be measured if you're so inclined. Of course, photo-diodes and amps are in most of our colorimeters but those longish TC usually gets way integrated out by our SW...


Dave



Quote:
Originally Posted by jdbimmer /forum/post/12927751


The Spyder2 can return a refresh rate, but I am not sure how accurate it is, and none of the software packages I know of display it in the user interface. You would need the SDK and custom code to do it.

Click to expand...

The Spyder2, Display2, Chroma5 all have the ability to measure refresh rates. In CalMAN V3 we do show what the refresh rate that was measured on the CRT sync step.

Derek, I wasn't sure about Calman - good to know it does. Using some quick code I wrote for the Spyder2 for fun, I recall seeing it return 59.94 Hz on a plasma at low stimulus levels and then jumping to some erroneous 100Hz+ readings at higher stimulus levels, possibly to due PWM. Not sure if the other probes do the same thing.



Quote:
Originally Posted by jdbimmer /forum/post/12936042


Derek, I wasn't sure about Calman - good to know it does. Using some quick code I wrote for the Spyder2 for fun, I recall seeing it return 59.94 Hz on a plasma at low stimulus levels and then jumping to some erroneous 100Hz+ readings at higher stimulus levels, possibly to due PWM. Not sure if the other probes do the same thing.

Click to expand...

Yes this is why the Display2 can have issues with Plasma unless it has been setup right.