Test Dispatch - Dec 2025 Newsletter

1.TestStand Scalability: If you are testing two different product models (e.g., Model X and Model Y) on the same fixture, you must use two entirely separate TestStand Sequence Files (.seq).

• Fact

• ✅Myth

Why it matters: In TestStand, it is best practice to use a single sequence file and manage model differentiation using logic. This can be achieved by reading a Model ID property from the UUT (Unit Under Test) and using Preconditions on steps or Flow Control (like If/Else) to selectively execute model-specific steps. This simplifies maintenance and deployment compared to managing two almost identical files.

2.Metrology/Calibration: Once an automated test system is qualified, the measurement uncertainty remains constant and requires no further periodic verification against traceable standards.

• Fact

• ✅Myth

Why it matters: Measurement uncertainty is not static. It can change due to factors like component drift, physical wear and tear on relays or cables, and environmental changes. Periodic verification and calibration against traceable standards are mandatory to ensure the system remains within its specified measurement tolerance throughout its operational life.

3.Custom Executives: For 99% of production applications, a standard NI TestStand Process Model (Sequential, Parallel, or Batch) provides all necessary process control and never needs custom modification.

• Fact

• ✅Myth

Why it matters: While the standard TestStand Process Models are highly capable, they often lack the necessary complexity for real-world production environments. Most large-scale test systems require custom modifications to the Process Model to handle specific requirements like communicating with a Manufacturing Execution System (MES), custom database logging formats, unique operator sequencing, or complex error handling routines.