A pass/fail rule should account for measurement uncertainty when a result is close to a specification limit. Agree on the decision method for the application.
How it works in practice
The measured value and its uncertainty are different quantities. Guard bands or other decision rules may be appropriate, but their choice depends on requirements and risk. Keep the rule transparent rather than silently changing it after measurement. Use current model-specific limits.
Example and interpretation
A result just below a maximum-loss limit may need review when uncertainty spans the boundary.
Checks before use
- Define the specification
- Estimate uncertainty
- Choose the decision rule
- Report borderline results clearly
Important limit
Do not declare an unqualified pass from an unsupported last decimal place.
Related Centron RF product
SMA rotary attenuator with 1 dB steps. The linked fine-step unit lists 0–10 dB in 1 dB increments. It can be considered for controlled level changes within its ratings. Dial resolution does not establish traceable accuracy; calibrate the assembled path as required.
Further reading
Keysight: Fundamentals of RF and Microwave Power Measurements. This background reference explains general principles; the selected Centron RF model’s datasheet governs its own ratings.
Related guides
Educational guide. Numerical examples use the stated assumptions and are not test results for a supplied unit.