Add to only upper limit

Question

-Hello Everyone
I'm new with TS, and running TS2.0
Q1:
I want a multiple numeric step measurement to only compare to a upper limit value. Can I do it?
Apparently TS allows me to compare to a low limit, and not necessary have an upper limit.
However, I can't do the opposite... comparing just the upper limit and not have a low limit.
I guess an easy solution would just to add inf or -inf.
Q2:
1)Some steps I have test with different limits.
2)Some steps I have test with same limits.
3)Some steps I have test with different/same limits, but different units.
for 1) should I use multiple numeric limit test or use a loop & change step limits.
for 2) use a numeric limit test, or use a loop to do the comparisons.
for 3) again use solution in 1).
Just curious, in how the most efficient way would be.
thanx

Answer 1

Hi,
For Q1, yes you can do upper limits (GT) testing, unfortunately TestStand stores the limit value in the lower limit property whether its a lower limit test or an upper limit test. There are tricks you can do, which have been address in this forum and maybe a knowledge base note or example on the NI website, so as to store the upper limit value in the correct place.
For Q2, there are examples showing how to use different limits based on expression see
here
and there is an example in the TestStand examples under limit loader.
Whether to use Multiple Limits steps or Numeric Limit Test steps really depends on what sort of tests you perform and whether the test returns more than one result. But using MultipleLimitsTest step with the limit file can get a bit confusing to look at.
Hope this is of help.
Regards
Ray Farmer
Regards
Ray Farmer