The same test script and hardware was used in both a 100% and 125% scaling condition. This allows the USB Serial event to be sent, and received, by the experiment program at a time when the program can rapidly receive and process the event. In this test we set the trigger offset to 7 msec. The MilliKey DeLux can be configured to send the USB Serial event a fixed number of msec after the actual light sensor trigger time, called the trigger offset. The appropriate light sensor threshold level for the monitor being tested was set by the test script itself. The MilliKey DeLux was configured to generate a USB Serial event after the DeLux light sensor detected the monitor brightness crossed a digital threshold level. The same script was connected to a MilliKey with the DeLux light sensor via USB Serial. The stated response time of the SyncMaster P2770 is 1 msec, which probably means it is closer to 2 msec peak to peak.Ī Python 3 test script used the open source PsychoP圓 experiment package to make 1000 dark -> light display changes, recording the flip() time of each dark->light change. In this test we used was a Dell G5 15 laptop running Windows 10 with NVIDIA graphics connected to a SyncMaster P2770 LCD monitor. Using the MilliKey DeLux light sensor upgrade and PsychoP圓 we compared the display update time reported by () to the time the experiment received a 1000 Hz USB serial event triggered by the MilliKey DeLux light sensor in response to each screen brightness change. Windows 10 Monitor Scale Setting 125% results in extra 1 frame (monitor retrace) delay. Windows 10 Monitor Scale Setting 100% results in expected display change timing. When using a 70 Hz monitor for example, this adds an extra 14.3 msec delay, causing the reported display update time to be off by one retrace as well. We have found that if the Windows 10 Display -> Scale (and layout) setting is not set to 100%, the Windows 10 operating system adds an extra frame delay to the actual monitor update time. It looks like you need to be careful with your display settings in Windows 10, otherwise Windows 10 could be adding an extra frame delay to the display update times reported by your experiment software.
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