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REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol
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marmad:

--- Quote from: Marty_MC on January 15, 2014, 01:06:15 pm ---Hello freaks,

first of all, I know this board is discussing about sniffing on the I2C bus then rather of using the DSO. However so many people are there who are using the DSO. So I believe someone can answer my question very quick. I am adding a big sorry to write an off-topic question there.
My question is very simple: It is triggering problem
I am struggling with a measurement problem: I have a big power Generator who is generating 400Volts AC. The armature coil is driven by 15V DC.
Unfortunately sometimes the 400V is going to zero for 10 Seconds. After that, everything is OK for hours or days. I am trying to figure out the reason. For that I am monitoring on channel A the one 230V AC phase and on channel B the 15 DC. However how can I parametrize a trigger?  I want to store the "event" of the two Voltages. At the moment I do not what the reason for the problem is. I do  not know if the 15DC is going to zero or the 400V before.
My idea is to store the event of the power drop-out. The DSO should stop after that event the acquisition.
i can not sit hours or days on the DSO to wait for the drop-out event. The problem is the event is very short, only 10 Sec. It can happen in the middle of the night. 

Thank you so much for our help. Any sorry again for the off-topic story.
 MartyMC

--- End quote ---

Welcome, Marty!

Some (or all) of this may be obvious, but I'll write it anyway (in case there are others who can benefit):

You'll want to use either Single Shot mode or Frame (Segment) Recording - either one will store the event.
If you use the full 56 M sample size @ 1s/div - you'll get a reasonably detailed view of 14 seconds (7s pre/post trigger). Don't forget to adjust the horizontal trigger position if you want a different division between pre/post-trigger information (e.g. if you only want 1 second pre-trigger, adjust the h.trigger position 6 divs left).
As far as your trigger goes, I assume if the AC goes out, the 15V will go out as well (or vice-versa)? If so, for capture purposes, it doesn't really matter which one initiates the event - as long as you capture enough pre-trigger data to include it. So as long as you calculate the maximum amount of time it takes for an AC dropout to drop the 15V, you can just trigger using a Falling Edge trigger on the 15V. Correct me if I'm wrong with my assumptions - otherwise another option is to use one of the pattern triggers with both channels as sources.

I hope some of this is helpful for you.
Wim13:

--- Quote from: marmad on January 15, 2014, 05:25:38 am ---
If Rigol wants to reproduce the Window trigger as specified by most other sources (which is a single defined Window), then the Enter / Exit button names need to be reversed - and the Rise / Fall names should be changed to one of the suggestions previously mentioned.


--- End quote ---

i dont agree, read your post careful,

T2 is a window and T1 is a window,

if rise =true and exit=true,
then the T2 window is all that is >= T2 level
then the T1 window is all that is >= T1 level

so the first event is when a signal enters window T2, then if next sample is bigger
then window T2 is true;

If the signal rises futher: then when input == level T1, it ENTERs window T1.....
if the signal grows further it is still in window T1

Then if the signal goes down....( not rise)... and it crosses the boundery of T1, it EXITs window T1

So in my opinion Rigol is correct, in enter en exit..

marmad:

--- Quote from: Wim13 on January 15, 2014, 02:46:55 pm ---
--- Quote from: marmad on January 15, 2014, 05:25:38 am ---
If Rigol wants to reproduce the Window trigger as specified by most other sources (which is a single defined Window), then the Enter / Exit button names need to be reversed - and the Rise / Fall names should be changed to one of the suggestions previously mentioned.


--- End quote ---

i dont agree, read your post careful,

T2 is a window and T1 is a window,

So in my opinion Rigol is correct, in enter en exit..

--- End quote ---

;D  Read my post again carefully - notice the bold section above. All other descriptions of Window triggers online talk about it as ONE window - in the middle. My final point addressed that: if Rigol wanted their trigger to follow the standard description of a Window trigger.

Otherwise, if they want to define it as two windows with a dead-band (as mentioned before), they just need to change the name/icons of Rising and Falling (which are a mistake).
Wim13:


Well some google, lots of different window systems are used:

on the ni site : Window Triggering: A window trigger occurs when a signal either enters or leaves a window you specify.

and that says it all, the window you specify...,

But i found this strange: see picture, i does not use T2 for trigger in this picture,
just using T1..., i think this is not correct..
marmad:

--- Quote from: Wim13 on January 15, 2014, 04:54:20 pm ---on the ni site : Window Triggering: A window trigger occurs when a signal either enters or leaves a window you specify.
--- End quote ---

The pertinent bit here is "A window" - in other words, a single window - which is how everyone (but Rigol) defines a Window trigger.


--- Quote ---But i found this strange: see picture, i does not use T2 for trigger in this picture,
just using T1..., i think this is not correct..

--- End quote ---

I'm telling you - they have the wrong name for the buttons! In your image, if instead of "Rising Edge" Icon button it was labelled "TopWindow" or "Over" or "Above", then the trigger would make perfect sense to what it's doing: Exiting the Top/Over/Above section.
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