Tracking Gate Threshold

Automatically tracks and compensates temperature-induced offset drift, so inspection runs without manual adjustment after the initial setup.

In eddy current structure testing, the pass/fail gate must be set carefully: good parts must fall inside the gate and defective parts outside it, so the gate is set to clearly separate the two.

Even with a well-set gate, one issue remains: offset drift. Active components on a circuit board change their output slightly with temperature, as shown below.

Example distribution of input offset voltage drift

In an eddy current instrument that amplifies small signals, these drifts add up in the final output, and the higher the sensitivity, the larger the temperature drift. Eventually the signal moves outside the gate and a good part is judged defective.

Other instruments require a NULL every few hours or manual repositioning of the gate. This increases operator fatigue and leads to inspection mistakes.

MEGACOIL minimizes drift with zero-drift components and uses Tracking Gate Threshold technology, which corrects the gate for temperature changes. The software calculates the temperature change and tracks the output signal, automatically keeping the gate on the good-part region — so inspection runs automatically after the initial setup.

Looking for the right eddy current solution for your line?

From sample tests and custom probe design to installation, our engineers are with you.

Inquiry & Demo Request ☎ 042-861-0881