Test Instruments & Measurement

Choosing instruments, using them safely, and knowing where each one misleads. Measurement category is a safety rating rather than an accuracy one, and the two commonest field errors — averaging meters on distorted waveforms, and ghost voltages on high-impedance inputs — both produce confident, entirely believable wrong numbers.

What this covers

• ▪Measurement categories and instrument selection — Test Instruments and the Measurement Errors That Mislead You
• ▪True-RMS versus averaging on distorted waveforms — Test Instruments and the Measurement Errors That Mislead You
• ▪Ghost voltages and low-impedance mode — Test Instruments and the Measurement Errors That Mislead You
• ▪AC versus DC clamp measurement — Test Instruments and the Measurement Errors That Mislead You
• ▪Insulation testing and protecting electronics — Insulation Testing Without Destroying the Electronics
• ▪Interpreting readings in context — Test Instruments and the Measurement Errors That Mislead You

Diagnosis guides

• Test Instruments and the Measurement Errors That Mislead You

  Multimeters, clamp meters, insulation testers, voltage indicators and thermal cameras used on generators, UPS systems, inverters, drives and installations

  8 diagnostic steps · intermediate · qualified electrician

• Insulation Testing Without Destroying the Electronics

  Insulation resistance testing on motors, generators, cables, switchgear and installations containing drives, controllers, UPS equipment and electronic protection

  8 diagnostic steps · intermediate · qualified electrician

Related categories

• Electrical Safety & Safe Isolation
• Motor Diagnosis & Rewinding
• PCB & Motherboard Repair
• Industrial Electronics & Drives