Numeric Limit Test - Several arrays and 1 limit set per array

Hello !
I am quite new to Teststand and I get stuck with an issue of which the solution should not be that intricate ... (I think ...).
I would like to use a "Numeric Limit Test" vi (LabVIEW module). This vi returns 3 arrays and I would like to define 1 "min/max" set for each array.
i.e. :
ARRAY1 => each element compared to min1 & max1
ARRAY2 => each element compared to min2 & max2
ARRAY3 => each element compared to min3 & max3
For 1 array, I found this solution : I write Locals.ARRAY1[RunState.LoopIndex] in "DataSource" and all the elements of the array are compared to the limits I have chosen. Of course, when I add 2 arrays, the same limits are compared to those new arrays but I would like to allocate 1 limits set to 1 array.
Does anyone have an idea of an easy solution ?
My Teststand code and the little vi are here below if it might help.
Thank you in advance !
Solved!
Go to Solution.
Attachments:
Arrays_Generator.vi ‏11 KB
Sequence File 1.seq ‏7 KB

Consider this example. The trick is Repeat One Measurement on the Data Source tab.
jigg
CTA, CLA
teststandhelp.com
~Will work for kudos and/or BBQ~
Attachments:
MultiARray.seq ‏7 KB
Output3Arrays.vi ‏10 KB

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Multiple Numeric Limit Test - Evaluate Post and Status Expression

We have a Multiple Numeric Limit Test where the limits for one of the measurements is a function of one of the other measurements.
In the Post-Expression there are two expressions that set the low and high limit based on one of the readings.
But the comparison does not seem to be using the calculated limits.
The report file shows the correct calculated Low and High Limits, and shows the measured reading as being in between the Low and High limit, but fails that measurement. I feel the Status Expression is using the default limits that are out of range.
The post expression looks like this
Step.Result.Measurement[2].Limits.Low=Step.NumericArray[1]*1.9,
Step.Result.Measurement[2].Limits.High=Step.NumericArray[1]*2.1
In Table 3-4 "Order of Action that a Step Performs", Evaluate Post-Expression (Action #15) is before Evaluate Status Expression (Action #16), but it seems that is not the case.
Or am I changing the wrong Low and High Limits. Am I just changing the Limits used in the report file and not the limits used for comparison?
Again the correct low and high limits are in the report but not used for comparison.
Thanks

Digging into the NI step type for Multiple Numeric Limit Test, I find that the comparison is done at Post-Step substep which is before my Post Expression is evaluated to set the correct limits.
So I have added code to my VI module to set the limits after taking the measurements but before returning to TestStand.

Dynamically configure multiple numeric limit test measurements

I seek to dynamically (programatically) configure a multiple numeric limit test such that I may set / increase / change the number of measurements in the step during execution. For example, I'd like to setup the step for 5 measurements:
M1, M2, M3, M4, M5 with limits 4<=x<=13.
I'll set the result data to {1,2,3,4,5}.
I can successfully set:
MyMultipleNumLimTestStep.ExpectedNumMeas = 5
MyMultipleNumLimTestStep.NumericArray (Number of elements to 5)
MyMultipleNumLimTestStep.DataSourceArray (Number of elements to 5)
MyMultipleNumLimTestStep.Result.Measurement (Numer of elements to 5)
Following that, I can access the individual measurement property objects (by offset) and set the Name, Limits.Low, Limits.High, etc...
During execution, I can view the step variables to see the values getting set correctly.
BUT, in the report, I only see measurement name, status and the measurement value. NOT the units, limits, comparison type.
Step
Status
Measurement
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Limits
Low Limit
High Limit
Comparison Type
AmpMatchTest
Failed
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M1
Failed
1.000
M2
Failed
2.000
M3
Failed
3.000
M4
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4.000
M5
Passed
5.000
Take note, prior to execution, I have no entries defined in the Limits tab of the step settings for this step. If I were to define, say, two steps and run again:
Step
Status
Measurement
Units
Limits
Low Limit
High Limit
Comparison Type
AmpMatchTest
Failed
Measurement:
M1
Failed
1.000
dB
4
13
GELE(>= <=)
M2
Failed
2.000
dB
4
13
GELE(>= <=)
M3
Failed
3.000
M4
Passed
4.000
M5
Passed
5.000
If I define >5 entries, my code will limit the result to 5. Any ideas?
Thanks,
Derek

Hi jigg.
I also need to configure a multiple numeric limit test programatically. Unfortunately your solution seems not to work (in Teststand 2013). Also with your code I get limits and comparsion entries in the report only for the first measurement. This is the one already existing in the step configuration.
Step
Status
Measurement
Units
Limits
Low Limit
High Limit
Comparison Type
Dynamic Call
Passed
Measurement:
AllParts
Passed
1
1 = Pass
1
EQ(==)
Another Part
Passed
1
Part 20
Passed
1
Part 2
Passed
1
Part 1
Passed
1
If I add a second measurement in the step, this one is shifted (like expected) and shows the limits and comparsion in the report.
Step
Status
Measurement
Units
Limits
Low Limit
High Limit
Comparison Type
Dynamic Call
Failed
Measurement:
AllParts
Passed
1
1 = Pass
1
EQ(==)
Another Part
Passed
1
Part 20
Passed
1
Part 2
Passed
1
Part 1
Passed
1
Measurement 1
Failed
0
1 = Pass
1
EQ(==)
What is special with the preconfigured measurements, compared to the programatically created test? Any help is very appreciated.
Thanks
--rainer

Multiple Multiple Numeric Limit Test

Hello
I have a test that I have written (LabVIEW) that produces 2 arrays of numeric Values. 1 array of Gain data and 1 array of Noise data. I want to apply (different) limits to each array (Same limit for each element within array). How do I do this in TestStand. I have used the multiple numeric limit test for tests returning a single array of data but my test returns 2 arrays.
It would be really in-efficient to split the test up into 2 tests as both Noise and Gain data comes back from the instruments in one sweep.
Any clues ?
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Chris

Chris,
Since your code module returns two arrays and you do not want to call the module twice you could have the LabVIEW multiple numeric limit test step to validate one of the arrays and have a None multiple numeric limit step to validate the second array. You have to send one of the arrays to a local or global variable so you can access it from the None multiple numeric limit step.
You could even execute these steps in a separate sequence and call it using a Sequence Call step if you want to see all the process as a single step.
Another option would be to create your own multiple numeric limit step type in order to support two different arrays as the data source at the same time. This solution requires more work from you. You could take the existing multiple numeric limit step type code as a starting point.
You can fin the code under <TestStand>\Components\NI\StepTypes\CommonSubSteps.
If you plan on modifying the code it is better to make a copy under <TestStand>\Components\User\StepTypes and modify it there.
This will prevent future upgrades from overwriting your changes.
If you have any question let me know.
Hope it Helps.
Antonio Lie.

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~Will work for kudos and/or BBQ~

Can I exclude measurement (of multiple numeric limit test) from results ?

I'm working on test where instrument returns multiple results at one call.
I use NI MultipleNumericLimitTest -step type (TS 2.0.1).
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I could do this for example by setting Comparison type of selected measurement to "No Comparison", so that this measurement is assumed to PASS always.
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