Our Blogs

Safety

Choosing the right CAT rating

CAT II, III and IV describe where an instrument may be used, not how accurate it is. Here is how to read the rating against your working environment.

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Technique

True RMS versus average responding

On a VFD-fed motor circuit an average-responding meter can read low by a wide margin. Why true RMS matters on distorted waveforms.

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Technique

Insulation testing: PI and DAR explained

Polarisation Index and Dielectric Absorption Ratio turn a single resistance reading into a picture of insulation health.

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Calibration

How often should an instrument be calibrated?

Calibration intervals depend on use, environment and the consequence of a wrong reading — not on a fixed rule.

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Field Guide

Measuring earth resistance in difficult soil

Four-wire measurement, spike placement and what to do when the ground is rocky, dry or built over.

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Field Guide

Thermal imaging for predictive maintenance

Reading a panel scan: emissivity, reflected temperature and how to tell a loose connection from a loaded one.

Article coming soon