Can TestStand 3.1 have an expression (or variable) for a numeric limit in a numeric limits test?

[Test developer]

All I see is a chance to enter constants in the high and low limits.

What about a local variable?

[AllenP]

This function is not possible in TestStand 3.5 or earlier.  You can use a pre-expression to set the value of a limit.  For example, Step.Limits.Low = 15 is a valid pre-expression.

Allen P

NI

[Test developer]

What happens with the numeric limit settings in the edit limits dialog box?

If it's a pre-expression, would they get over-written?

[AllenP]

The edit-time copy of your sequence remains unchagned with the constant values.  The run-time copy is updated.  Since the pre-expression always executes before the code does, it is essentially the same as having an expression for the limit.

The edit dialog box, since it only touches the edit-time copy of your sequence, will keep whatever constant values you select for it.

Allen P.

NI

[RayFarmer]

Hi,

There is an example in the teststand examples folder which will allow you to use an expression in the limits file.

This maybe a be a solution for you.

Regards

Ray Farmer