David, Thanks, yes, I have matched cables, etc. I have a couple of sources with less than 10ns rise time at 100Khz. I didn't see any other frequency listed than that.
The primary failure is on the REPET calibration which it does first on the CHAN DLY cal. If it fails, the manual then suggests probing TP291 with REPET on. I can't get a solid trace there but when I turn on REPET when looking at relatively fast signals, it works fine. This test must have something to do with the phase of what is on TP291 and whatever clock is used for the REPET sampling.
The gains, Trigger, CTE all pass. I'll keep screwing with it.
Thanks.
Jerry