TestStand - change test limits based on a previous test result.

[jimbobaggies]

Hi there.

Is there a way of setting limits during a test? What we want to do is take a measurement, read back the result, and based on this adjust the test limits later on in the test sequence.

TIA

Jim.

[WireWeaver]

You can set the limits to a variable and then modify the variable. Alternatively you can access the limits directly in the Step.Limits container. e.g.:

Step.Limits.Low = Step.Result.Numeric + 1

If you decide to modify the limits in one of the step expressions, be aware that the post expression happens before the status expression, which is where the pass/fail value is determined:

https://www.ni.com/docs/en-US/bundle/teststand/page/step-execution.html

Hope this helps!

Trent

[pulidotech]

I would create a local variable and in the post expression for the step where you take the measurement, add something like Locals.Variable=Step.Result.Numeric

Then, in your later step, make the limit utilize Locals.Variable