Auto schedule pick an instrument multiple dmm

hi
I am trying to use the test stand auto scheduler
I have a test setup with 2 DMMs of the same model. I don't really mind which DMM I use for measuring a voltage since they will be connected to the DUT via a matrix switch.
I have written a sequence which will be re-used over and over on multiple DUTs and it requires access to a DMM.
Can test stand automatically pick a free DMM and switch it through to the test point I need? or do I need to specify which DMM I want to use?
Any ideas?

A lot of these questions will become answered as you become more familiar with TestStand.
However, let me see if I can try to answer them here:
Each VI is set up to call the different DMMs. So that is not a problem. The key is knowing which one to call. This is done using the Preconditions and Pre Expressions for each of the steps. You can see that the preconditions are set to look at the acquired resource. This way you know which step to call. Also you could set the switching for those steps to use the correct paths through you switch matrix as well. This is where it gets tricky though because you have to make sure that a path for DMM1 will never conflict with a path for DMM2. Because if they do then you cannot have 2 DMMs.
If you look at the Use Auto Scheduled Resource step for the DMM section you will notice that it identifies 2 resources. By the very nature of how autoscheduling works when you declare 2 like that only 1 has to be used in order for that testsocket to satisfy that section. Any of the resources scheduled in the auto scheduler are actually "soft" resources. This means that they just exist in software. Even though you have hardware physically out there the soft resources are just used to lock so threads don't tromp on each other.
TestStand knows that the DMM is available because another thread has released that soft resource. And then the testsocket just grabs whichever one is available.
The NI TestStand Reference Manual should help you out. There is a section on page B-25 which talks about Auto Scheduling.
Also, not sure if this example helps out either:
http://zone.ni.com/devzone/cda/epd/p/id/6528
Hopefully this helps. It's kinda hard to explain I wish there was more documentation out there for this.
Let me know if you still need further clarification.
jigg
CTA, CLA
teststandhelp.com
~Will work for kudos and/or BBQ~

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Use Auto Schedule dynamic lock

Hello
The setup is as follows:
My customer wants to run 4 individual test fixtures off the same PC. Each test fixture will run at least 4 parallel tests at the same time using the parallel model. For now we can assume that it is the same sequence that is executed across all sockets and fixtures. This may change but the same lock conditions will persist over different sequences.
What i need to do is to lock steps and resources, both internaly in a fixture and across all fixtures. Here is where my problem lies.
If i use a regular lock then i can acomplish this, all i need to do is keep track of what fixture is actually executing the steps. I can lock on a parameter, say Parameter.Fixture. Or just lock globaly ignoring what fixture is actually executing.
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/ Nimgaard
Solved!
Go to Solution.

Thanks for the input.
@James: Ok, then i think i got it right. I will probably post in the suggestion as i think it would be better to support lock on what the expression evaluates to rather than the component of the expression itself. I can however see why it works as it does because if you got an instrument handle then its easy to just use that handle as the lock. And when you look at the examples, it looks like actual hardware on a single test environment is what was in mind.
@dowNow: I cant do that because each fixture has its own hardware. If i put a global lock they will wait for each other which will create unnecessary long test times, and if i put one lock/hardware then any fixture can access hardware it doesnt have physical access to. At the same time, the customer wants to run it all in one application on one computer, the idea is to be able to have an operator load the different fixtures and run the tests without having to run between stations/computers. I checked the example and placing the steps is easy enough. I also have it running correctly with regular locks but that will also increase the test times as the internal resources in the test equipment will have to wait in sequence instead of using the first available resource.
Another question:
The issue is obviously tied to the OI as they want to run it on one computer, if they didnt want that then it wouldnt be a problem really. As far as i can tell, all executions are shared within the same AppManager. Would it be right to think that sequences that run on different AppManagers wont share locks, and if so, is it possible to have more than one AppManager in a single application?
Another way to solve it that comes to mind is to have each fixture access a slightly modified copy of the master file with different names on the locks. Obviously not ideal to handle code like that though.
/ Nimgaard

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Auto schedule pick an instrument multiple dmm

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