I have no trouble displaying just the measurements I want to show, turning others off, adding new ones or displaying old, previously turned off measurements. Of course I actually use the scope every day to make measurements (however quirky or wrong or misspelled they may turn out to be) so I am very familiar with how the system operates. It appears that some people weren't even aware of the "Select Item" list or haven't used it very much.
When I first got my scope a couple years ago, there was only the Clear menu where you could supposedly delete individual items or all. There, deleting just grayed it out. It did not remove it from the screen. So, I stopped using that menu since it wasn't useful to me. Instead, I just treated the display as a de-duplicating, broken buffer. When I wanted different items displayed, I just pushed five new measurements into the buffer to fill it with what I wanted to see, even if that meant that not all five were ones that I needed.
So, I never noticed when the Sel.Item menu was added.
Perhaps it may help to think of the measurement display as a sort of list buffer that holds the last five that you have selected and allows you to turn on or off any of those using the "Select Item" list. When you want to add a sixth one, it goes in the fifth place and pushes the rest down one position, and the old "first" one is gone. It gets slightly more complicated when you have Large or ExtraLarge fonts selected since only three or two of the five can be displayed at one time, or if you insist on displaying your chosen measurements in some particular order.
Unfortunately, it's a rather broken system because deleting an item doesn't delete it, it grays it out. Deselecting an item hides it, but unless it's the left-most item it'll come back when you add new measurements.
Try this:
1. Add five measurements to the display. I currently have
Period,
Freq,
+Width,
Max, and
Min.
2. From the Sel.Item menu, deselect items 3 (
+Width) and 4 (
Max). You should now only see
Period,
Freq, and
Min, which looks nice, but don't get happy yet.
3. Add a new measurement. I'll add
Vpp.
Now, I have on my screen
Freq,
+Width,
Max,
Min, and
Vpp.
Period is gone. I didn't deselect it. However, it got pushed out even though two other measurements were deselected to make room for the new measurement. Deselecting is not deleting. Deselected items can't be seen but still occupy space.
+Width and
Max are
back. I did not re-select them. They reappeared simply by adding a new measurement.
4. Now let's use delete. In the Clear menu, delete
Max. It'll be grayed out as if it's deselected.
5. Add
Vtop. Now we have
Freq,
+Width,
Min,
Vpp and
Vtop. Now Max really got deleted.
Thus, delete grays out items as though they're deselected instead of removing them from the screen, but then deletes them when adding new ones. Deselect hides measurements so that they look like they're deleted, but then restores them when adding new measurements.
Sure, the Rigol software often appears to be a set of "kludges" that were cobbled together by a committee of junior programmers who have never actually used an oscilloscope...
Yes, that is how it seems.
But what did you expect, it's only 400 dollars. Shouldn't you be happy that it even "pretends" to do measurements at all?
Hehe. Yes.
We've all become adept at it. I got a bit too happy last night when it seemed to be fixed.