Hi
My app is controlling two pumps via RS-232 (qextserialport). The pumps should be updated with a new rate every second. It works fine but when I compare the elapsed time in my qt-app with an accurate stop-watch it differs approximately 1 second per minute. The Qtimer seems to be slower than the stop-watch.

It is even worse (slower) when I controll two pumps from the same app so I need to controll each pump from one software each. Having two apps open is not a big problem the biggest problem is that the pumps are running for about 24-48 hours before stop and adding all differences in Qtimer means that after 24 hours the app has only pumped for about 23.5 hours whilst the timer says 24 h. Are there any Qtimer with more accuracy or depends this problem on the machine (HP-Laptop quite new)

Thanksfor any help!
Thomas