How do you plot multiple curves on the same graph when using a while loop?

I am writing a program that will plot the IV Output chracterisitcs curves for a MOSFET transistor. I have two sweep variables Vg and Vd. For each Vg valve selected, Vd is swept from its start to stop voltage creating a graph for that Vg valve. Both of the sweeps are done using while loops. Ideally I would like to display all of the Vg plots on the same graph while having the ability to do real-time graphing. Can anyone help me figure this problem out? I have attached my program. Thanks!!
Tammy
Attachments:
outputfin2.vi ‏165 KB

Hi Tammy & Tica T,
As far as I see it - this thread is a very bad version of already existing bad version......
http://forums.ni.com/ni/board/message?board.id=170&message.id=127857
I expected, that an Applications Engineer from NI knows something about a Transistor and how an Output characteristic looks like !! Take a look to a typical Transistor Datasheet ( e.g. n-channel MOSFET) - you will see, that there is no relation of ID vs Time like in your example ( values vs time ) but IDrain vs VDrain at different VGate's ( no relation to Mr. Bill Gates ).
Find attached a vi, that in general does what you need - drawing of curves vs x-axis (XY-graph in use) - in test_sweep.zip. And that you geet an impression, how it might be done ...... dynamic Output characteristic of a Transistor with Standard Equipment of a Lab ( Scope + Generator + Power Supply ) find in addition a Frontpanel - picture. One of the interesting points here is - the self-heating effect; visible on ch3 of scope - 5µs Pulse is already a very long time...... This measurement was done in order to compare with our own Transistors.........
Hope this helps a little bit to understand, what we are talking about.
Regards
Werner
Attachments:
test_sweep.zip ‏358 KB
dynamic Transistor char.png ‏65 KB

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