how to Sycnorise 3 measurements

[looser]

Hi all..
I have been advised that in order to make 3 independent measurement at the same time, i should build parallel measuremnts that enables sycnorise between those. I couldnt find anz example in the example VI's.. is there any one who can guide me or supply examples?
thanks
(using LV7.0)

[tbd]

Hi L,

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@looser wrote:
Hi all..
I have been advised that in order to make 3 independent measurement at the same time, i should build parallel measuremnts that enables sycnorise between those. I couldnt find anz example in the example VI's.. is there any one who can guide me or supply examples?
thanks
(using LV7.0)

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Are you measuring three different voltages simultaneously?  What kind of hardware (DAQ board or measurement equipment) are you using?  When you say "at the same time", if all three measurements were made within one micro-second, would that be good enough?  How close-together do the measurements need to be?  After you make the (3) measurements, how much time will typically elapse before you want to do the (3) measurements again?

Cheers!

[looser]

Hi tbd..
What i mean simultaneously is that these 3 measurments should be done as close as possible. 1 micro second would be enough. The devices are 2 agilent multimter and one Kepco power supply with GPIB! The elapsed time should be around 300 ms before new measurements. I tried to built measuring scheme as making 3 parallel loops in each there is one measuring sub vi. but it s still not sycnorized enough, plus the execution order of the loops is hybrid..( changing). I read some techniques like triggering but it s kind of hard for me since i m beginner.
if u look at the attached file, u might understand what i want. At the beginning i initialize 3 devices. later in the loop, i set the power supply current to certain value, i wait for a while for system stabilization, and after that i want to measure out put of the power supply and other 2 multimeter in very short time ( 1 sec would be enough). But this configuration, it s not satisfied. I would be glad if u give me some concrete idea or examoles.
thanks

[tbd]

Hi L,

How close together do the 3 measurements need to be?  Is 10 ms close enough?  With your test-setup, that's probably reasonable.   (It mostly depends on the Kepco PS...)

You're going to have to read the __ manual - sorry!  As you said, the subject will be "triggering".  Look in both manuals for "GET" or "Group Execute Trigger".

I'm sure the Agilent device(s) will support "GET" - hopefully the Kepco will too.  If so, you'll setup a measurement on all 3 devices, then send one trigger.  See GPIB\GPIB 488.2\"TriggerList"

If the Kepco doesn't support "GET", maybe it will support *TRG - not as good, but better than nothing.

Post back when you learn more about what kind of triggering (including "external") your devices support.

Cheers!