Automatic measurement

[enricopug]

Hello everyone, I hope to fnd a solution here.

I'm planning a VI wich make an automatic measurement with instruments connected with computer through GPIB.

The instrument are:

-Oscilloscope (HP 54645A)

-Wafeform Generator (Agilent 33250A)

-Data Acquisition (34970A)

I have two big problems I ask you a help.

1) To have two different Graph for the two channel of Oscilloscope I put a "Flat sequence Structure" but if one of channel is not connect the VI give me error. I wish that it read the channel connect and not read the channel not connect

2)With Data acquisition I've planned that it make a series of measurement of temperature with regular intervals of time. I wish find a way to export the results in a file excel which in columns there are measurement that it made.

Thank to everyone who will respond

[GerdW]

Hi Enrico,

1)

- In your VI you don't use the error cluster that much. Use them always and as much as possible!

- When you know which channels are connected you should program an algorithm to just measure the connected ones.

- When you don't know which ones are connected you should do some error handling in your VI!

2)

Write your data into a spreadsheet file - there are several functions/VIs allowing you this easily…

For "regular" time intervals it's kind of overkill to use a TimedWhileLoop in your application: you are talking to an external device so a normal While loop with a standard wait function inside is sufficient. In your special case a FOR loop would be more appropriate as you limit the number of readings…

[enricopug]

GerdW thank you very much for your answer and your help.

With your advices I changed little bit my project, and I've resolved the second problem but I didn't understand how resolve the first.

I have tried other way to project the oscilloscope but I can't resolve my problem: if I don't attack one channel to oscilloscope the VI gives me error in the error cluster and doesn't show anything in the block diagram. 

If you (or anyone else) have a little time to see the attached for say me what I wrong, I'll be appreciative 

I put the all project (L_primo progetto.vi) and the part of project where I have the problem (HP54645A.vi)