Many applications require objects that are sheets, wafers, panels, or plates of conductive or conductively coated material.

Delcom meters do not directly measure the resistivity of material—instead, they measure the sheet conductance of a conductive layer.

The essential element of an eddy current meter is an inductor in a ferrite core.

Four point probes are the traditional instruments for determining sheet resistance. However, for many applications, Delcom’s eddy current meters are much more useful.

Each Delcom sensor is calibrated against a National Institute for Standards and Technology (NIST) standard.

Theoretically, a Delcom eddy current meter could measure from zero to infinity ohms/square. However, in reality, such a range is not practical or necessary.

Eddy current meters usually have a top and a bottom inductor. Material reads as a higher sheet resistance in the exact middle elevation between the top and the bottom halves of the sensor.

The S3 meter has a single-sided sensor. As such, the magnetic field is thrown off from the face of the sensor in a fountain-like pattern.

The essential elements of a Delcom eddy current meter’s sensor are inductors in ferrite cores.

When material smaller than minimum sample size is measured, the meter will deliver a higher reading in ohms/square (more resistive) than the material would read if it was equal to or larger than the minimum sample size.

Eddy current meters experience reading drift correlating to drift in the surrounding temperature and variation in the meter’s own internal temperature.

The readings of eddy current meters are affected by changes in temperature—both external and internal.

Mapping the sheet resistance or conductance of a sheet, panel, or wafer can be easily accomplished with a Delcom eddy current meter.

One useful advantage of Delcom’s eddy current meters is their ability to measure multiple layers.

Eddy current instruments are technically not capable of measuring material smaller than the stated minimum sample size.

In most cases, Delcom meters should never need to be recalibrated. However, users do have the ability to calibrate their instruments if desired.