Just bought a nano dso v.2 and I wonder if it is capable of detecting a signal (short length,and voltage triggered)and leaving the waveform displayed on the screen.
I ask because I do quite a bit of camera repair and this would be a wonderful thing as shutter testers are expensive and hard to find for most film camera enthusiests.
I am currently using BENF 3.6 firmware, and while I can use an analog oscope,the dso is new and alittle daunting to me.
I am more than pleased with nano v2 and the information on seed studio and this forum has been very helpful.
It reminds me of the energy and innovation i saw in the days apple and commadore.
Thank you for the opportunity to participate in something new and refreshing.
Any help would be appreciated.
Does Tr. Mode > SINGLE not work for your needs?
Generall speaking, The single mode in DSO can meet you request…,except the “short length” signal is really very ,very short… 
I don’t mean to be vague but as I understand some dso’s when set up correctly can capture to the display, not memory, an image of a one time event.
Of course the image is dependent on preset time or period settings before the pulse.
Something like persistence of vision.Am I using a proper term for one shot capture?
Like I said earlier I know the limitations of an analog scope (use of seperate trigger for photo graphic exposure with high speed film).
As you can see this method is way beyond the average hobbyist.
I’m just getting started with my nano and I’m sure I’ll become more proficient with it.
If someone could lead this old tweaker through basic setup for this possible useful test mode,I would be very thankful.
There is a series of videos available that explain all functions of the Nano:
youtube.com/user/lwgraves?feature=mhum#p/p
Perhaps you could look through those “DSO Nano” videos to find your answers. These video adress all firmware updates as they were made available. YOu can nuse v3.61 firmware, but some displays will behave slightly different.
Ok, let’s imagine you want to capture a spike of some sort on the rising slope.
Set the VD (Voltage/Div) and TD (Time/Div) to the propper settings (otherwise you might damage your Nano, especially if the Voltage is set too low).
Go to the Menu TR (Trigger) and set Tr. Kind to the rising slope, the Tr. Level to the Voltage to Trigger and the Tr. Mode to “Sing” for Single. With this Trigger Setting the Nano will stay blank (“Sing” is green and the Trigger sign is red) until the trigger is met (“Sing” goes red and Measurement line is displayed). The trigger event will be in the middle of the screen. To “re-arm” the Nano (to be able to capture again), you have to press the “A” Button on top of the Nano (“Sing” goes back to green).
If you are only interested in the event after the Trigger, you can switch the Buffer from the normal Setting (Pri Equal, which means remember equal parts from the measurements before and after the trigger) with XA -> Buffer Pri to the Post Mode (Pri Post to use the whole buffer to capture the measurements after the trigger).
For a video explanation of all the nice functions of the Nano I also recommend the wonderful videos from lygras post.
Here’s the one for the trigger Modes (Shown on the older Nano V1 with the same features):http://www.youtube.com/watch?v=OOPvjUMVM94
That’s it, just what I need.It is a matter of a detector, a photo transistor to send a signal
about 1volt to the input of the nano representing shutter open time.I have the detector and will use your excellent instructions.If it works as I believe it will then I and other camera hobbiests will be grateful.Thank you very much for your expert help.I will try to contribute to the forum as best I can.
p.s. I really look forward to the quad model.
UPDATE:with the forum’s assistance I was able to use my dso nano V2 to test camera shutters at very close tolerances.
The quality of the traces showed defects down to nano seconds.
Thanks to all members for your assistance,please keep up the good work.
Just one bitch; had to repair broken B button,reassembled dso and it’s good as new.
Have preordered quad dso and look forward to it being in stock.