how to improve time interval between two measurments

[npoling]

In the parallel situation whichever sub vi gets the data first will execute first, so you may want somewhat of a hybrid, where you run the "set power supply current" vi in series with the "read multimeter" vi's wired in parallel.  Since you want to set the power suplly first and then read the multimeters (whichever one is read first probably doesn't matter).

Nate

[looser]

Hi Dennis...
your suggestion sounds great ,but scares me:)(I m still beginner).. Anyway, I have checked the powersupply manual and supports both kind of trigger. As far as I understood as a simple picture, I ll have a trigger condition taht will be sent 3 instruments at the same time causing them measuring simultaneusly(relatively), and after each measuremnt same trigger will be sent again by a loop and measuremnt ll be kept going. In order to make more concrete for me, what kind of trigger condition would it be? regarding the stuff above (if i understood correctly) could you provide me a simple example?
thanks

[npoling]

Dennis,

Great idea with the external trigger!

Looser,

You could alter the external trigger idea slightly to only trigger the multimeters if you are scared to externally trigger the power supply.

Nate

[Dennis_Knutson]

Here's something that can get (no pun intended) you started. The last time I had to use the GET command, I used the GPIB functions instead of the VISA GPIB Command function but I think this will work. After the GET, you should probably check the status byte of each instrument to see if the reading is complete. I'm not sure if the 34401 driver will work unmodified. In the Read Meas function, you would want something that does not do a Read or TRG command. Issuing a FETCH? may be enough. I don't have the instrument manual very handy and the only 34401 meters aren't available for me to experiment with.

[looser]

thanks Dennis, thanks npoling ..
Alhough i m ,at the moment, far away of achieving that by just looking the picture, i m ambitient:)
I ll work on it...

[Carlz]

Hi guys

Arent there any simple VISA function corresponding to the Trigger multiple devices in 488?

Cheers