Hi Volker,
So I played around with the single tone file you linked, and got it to work as I think you intended, as a test for whether a CW is present. I attached some images, where I zoomed in on the CW and I increased the Div to 15 to see more y-axis.
I did also change the point at 250M to -60 instead of +24 so it’s easier to play with a signal generator at my desk.
I attached three pictures, one where I increased the RBW and you can see it passing. Then two more where I shifted the CW freq and lowered the RBW and it fails both.
The limit line was configured as a min limit line.
Can you provide any more information or maybe a picture showing the scenario you see. If you are able to zoom in on the span as well, it could help me determine why you are unable to reproduce my results.
I will need to look into the roundings, I agree that it is an issue. I will try to get a fix for this for next release. I’ve been editing the files in a text editor for now and it seems to be working.
Edit: I think I see the issue you are experiencing with the line always passing sometimes. One of the issues here is that the spike that you are putting in the limit line is very narrow, and there are only a finite number of points in the sweep, so it is possible that the entirety of the spike and adjacent points fits between two of the sweep points. Basically the lowest RBW you can get away with is what you should use as it will increase the number of points in the sweep giving you more resolution to test again the limit line with.
I look forward to your response.
Regards