My DS2072, did a single shot trace this morning at 2 sec/div. Waited till it said "WAIT" (confusing, means scope is waiting for trigger, not for you to wait...) then switched my cct on and this caused a trigger because it said "TRG" or suchlike, can't remember now, then eventually after maybe 20 seconds or so it said "STOP" in red. After about five minutes there was still nothing displaying on the screen so I moved the time/div kob back and forth one click and BYU there was my trace! Interestingly, it didn't start right on the trigger point but about 2.5mm to the right.
This display not showing up immediately only seems to happen at slower sweep speeds; high speed ones appear as soon as the scan is finished. Not sure what the borderline between high and low speed is yet though. Just that at 2 sec/div it acted up. Any ideas?
The length of time it takes to be ready for a trigger (WAIT) and then display the acquisition is a function of the time base setting * 14
-OR- memory depth * sample speed, whichever is longer. The trigger position affects the division of that length of time. Did you ever wonder what that display graphic at the top center of the screen was for?
Examine the following 5 images - all made at 1s/div. Pay attention to memory depth, the graphic at the top center of screen, and the WAIT/DISPLAY times which I have scribbled in:
1) 14k sample size and center trigger position.
2) 14M sample size and center trigger position.
3) 14M sample size and left trigger position.
2) 56M sample size and center trigger position.
3) 56M sample size and left trigger position.
EDIT: BTW, posting USB screen captures when you have problems would help us point out what mistake you're making.