In field verification, which equipment is typically used?

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In field verification, you need a reference that you can carry to the measurement site. Portable standards are compact, calibrated references with traceability to national standards, so they let you verify an instrument’s readings on site without sending equipment back to a lab. They enable quick, practical checks under real-use conditions and help confirm the device stays within tolerance in its actual operating environment.

The primary national standard is typically large and stationary, designed to establish overall metrological integrity at a national level rather than for on-site checks. Large lab-grade equipment likewise requires controlled lab conditions and isn’t practical to move to the field. Software simulations don’t provide a real-world verification of an instrument’s physical output in the field, since they model behavior rather than measure actual signals. So portable standards are the most suitable choice for field verification.