![]() ![]() ![]() The delay between the keyboard’s caps lock LED first lighting up (‘zero point’) and the monitor first exhibiting a change on the screen was calculated. The first test has the monitor running at 155Hz with the monitor running Microsoft Paint fullscreen such that a left click closes this view and returns to the application. The video below shows three separate tests, which are explained below the video. Using a Samsung Galaxy Note 9 with 960 fps slow motion video capture and a Rocat Arvo gaming keyboard (low latency, caps lock LED lights up with very little delay), we found the tool did indeed offer useful data and if used in an appropriate way provided strikingly similar results to SMTT 2.0. Our initial testing using a Dell S2719DGF and this tool has been very promising indeed. This sort of flexibility is very welcome, so we took the tool for a spin to see whether it could provide reliable measurements that were at all comparable to something like SMTT 2.0. They could run the monitor at any refresh rate it supports, any frame rate and in any specific application. The Display Input Lag Tester tool is not only self-contained, it does not restrict the user in terms of the testing environment. This sort of ‘self-contained’ test has some advantages over methods such as SMTT 2.0 or the less reliable ‘stop watch and camera’ method, in particular that it doesn’t require multiple screens to be set up in clone mode. a specific test program run at a certain refresh rate and resolution). ![]() Furthermore, they’re usually inflexible in terms of the assessment conditions (e.g. These tools would require specific investment by the user for something that would have no other use to them. The principle is essentially similar to signal generator based input lag assessment tools, Leo Bodnar’s device being the best known iteration of that. This can be calculated if the video is reviewed or edited using software that allows the user to see individual frames of the video, which includes the player integrated into Windows 10. In other words, it gives users an indication of the input lag of their display. They can then use a high speed camera (such as the ‘slow motion’ recording feature found on some modern Smartphones) to calculate the time delay between the mouse button being clicked and the screen reacting to this input. His tool, appropriately named Display Input Lag Tester ( download here via Google Drive) allows users to have an LED of choice on their keyboard (num lock, caps lock or scroll lock) light up when they click their mouse button. We were recently contacted by Raymond Wang via our YouTube channel (see pinned post on our LG 34GK950F video review) who has developed a novel method of input lag assessment using basic equipment which many users will have at home. ![]()
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