Things You'll Need

Instructions

1

Calibrate the machine according to the materials specifications. Most ferrite scopes have three calibration standard sets, which cover low, medium and high range standards. The calibration procedure is outlined in the specification manual.
2

Locate the welded seam or other area where ferrite is to be tested. Inspect visually for fissures, which can indicate low ferrite levels.
3

Bring the probe into contact with the welded surface and hold it in place until an audible sound is heard. This should take no longer than three seconds. Record the ferrite number (FN) reading. More than one measurement should be taken to ensure statistical validity. Perform 10 successive measurements n the same area by lowering the probe perpendicular to the specimen. Record each measurement.
4

Report the average ferrite number of your readings. The ferrite number can be bracketed between two values to indicate a range. This provides sufficient information in most applications where a minimum ferrite content or a ferrite range is specified.