Instrument Control (GPIB, Serial, VISA, IVI)
How can I control power supply by steps
You can always ask, but Im not always able to generate a comment immediately.
In this case you have to replace my "control" of the sr830 with one that works.
You best start with a simple program that only controls the sr830.
Probably it will need some initialization, and exit code also.
This program can then be changed into 3 vi's called init sr830.vi doit sr830.vi and exit sr830.vi.
This is all that is needed to complete your program.
Use the init.vi on the position of the visa resource in my example
Use the doit.vi with a voltage input on the position of the update magfield.vi
use the exit.vi after the while.
PS the vi you attached missed also a lot of subvi's so no way to do it for you.
good luck
Dear Mr. Albert,
I have been modified and tested with the example that you kindly did for me. I am so sorry that the power supply drivers are not included in the attached files. I don’t know why they are not included in it. May be my poor knowledge in Lab View.
I
have attached the snap shot of the step voltage power supply program that I modified
your example. When I measured with it, I could not get the step voltage as I wanted.
For example, I want to get voltage start from 0V with step voltages 0.01, up to 10 V and then decrease to -10 V and then to 10 V. The output to the PSU should be
(1)0,0.01,0.02,0.03,0.04,0.05……….9.99,10
(2)10,9.99,……………………………..0,-0.01,-0.02,……-10,
(3)-10 ,-9.9,…………………………………………….+10 V stop and INITIALIZE to zero.
However,
it stops at 2 V and did not continue as I expected. I tried many times in the start Voltage and step size array . I put start voltage 0 V and then voltages as 10.-10 and 10 with same step size 1 V.
My request is what should I modified to get the output as I expect and how can I put the values in these arrays to get for step 1 through step 3 continuously.
Thanks for all the kind help and suggestions for me.
Sophie
You should have used the step voltage example.vi I did send you in the other thread.
In that example all stepvoltages are calculated before in a loop they are used to output to the generator.
This example uses a subvi to calculate all the steps and you have screenshots of a modified subvi that also tries to output the values.
Pleas look carfully at the text in the icons in the example. One of those subvi's is a dummy one
At that position you should place a vi that outputs a voltage to the generator. By replacing the dummy one.
After that vi, a wait is placed and after the wait the dmm is read out.
so you have a complete example, study it more carefully
good luck
can you send me the modified example that worked in simulation mode, with real drivers for the magnet control?
There must be something wrong in that control.
I really do not understand why you are not calculating all values and then use this array of values to do the actual stepping.
Pleas do not mix the generation of the values by the rest of the program.
It is much less understandable that way.
Another question is regarding your sweep values function: Why are you using locals? In this it is absoultely unnessecary.
Having long wires is not an excuse, readability could but you can do your compares before the wires get twisted.
