THE FIELD NOTES

Bench measurement

Understand the reading before trusting the digits.

More counts. More accuracy?

Decode multimeter resolution and accuracy specifications, then calculate a stated error limit for a particular range and reading.

6 MIN READ WAVEFORM & BANDWIDTH

True RMS still has limits.

Understand AC versus AC+DC, bandwidth, crest factor and amplitude limits before interpreting a True RMS multimeter reading.

6 MIN READ CLAIMS & EVIDENCE

What supports a CAT marking?

A practical evidence checklist for multimeter CAT claims, accessories, declarations, reports and teardown photographs.

7 MIN READ

Begin with a defined measurement.

These guides explain published specifications and method limitations. Calculations are illustrative; product observations are attributed to the original author. Use the exact manual for your instrument and record the operating conditions.

Explore our evidence methods →