Created attachment 436 [details] 1kHz signal without and with pre-trigger set Using Pulseview v0.5.0 on Windows10 with LHT00SU1 logic analyser recognised as CWAV USBee AX When I put anything other than 0% in the Pre-Trigger capure ratio all timings halve. That means that a 1kHz signal is shown as a 2kHz signal. In the attached picture both traces are the same signal.
I don't have an explanation for this on the PV side, suspecting a driver bug.
Forgot to tell that the "time-halving" only happens when triggering is active together with the non-zero Pre-Trigger capture ratio. Today I checked two other things. First, the effect is also seen on Linux (Linux Mint 18.3 Sylvia) where it happens under the same conditions, triggering active and a non-zero Pre-Trigger capture ratio. The second thing I tested today is with a (even cheaper) 24MHz_8CH Logic Analyser under Windows 10. (Those tiny things you can get on Ebay for less than 10 euros) To my surprise it works flawlessly! No "time-halving" under any conditions. And also, the triggering makes much more sense with the 24MHz_8CH analyser. With the LHT00SU1 the triggering happened more or less at the moment I expected, with the 24MHz_8CH it is spot on.
Thanks for the follow-up :) That confirms my suspicion and so I'm re-assigning the bug.
Pretty sure this is a duplicate of #1133, marking as such. *** This bug has been marked as a duplicate of bug 1133 ***