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ALPHALAB The Air Shipment Milligauss Meter (Oersted Meter)
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The Air Shipment Milligauss Meter has been designed so that one person alone can be the tester, and do repackaging, if necessary, without moving from the area. The remote sensor, shown on the right side, is connected through a 15-foot cable to the control box (left). This control box is placed next to both the package and the tester (person) so the tester can manually rotate the shipment. The remote sensor is placed either 15 feet or 7 feet away, depending on which test is being done.
Using knobs on the control box, the meter is first set to zero without the air shipment present. This compensates for the field in the room (including the earth's field). This “zero” adjust remains accurate until the sensor is moved or if something large and magnetic is moved nearby. After zeroing, the package is brought in and rotated (in a “lazy Susan” manner) 360° on the floor. As the package is rotated, the tester is watching to see if the display ever reads over “5.25” or “-5.25” milligauss, or “2.00” or -2.00”, depending on which test is being done. With the fast update speed of the numerical display, the whole test requires about 20 seconds, including 360° rotation.
The meter is performing “relative” field measurements when used as described above (where the meter detects up or down deviations of the field relative to the normal room field). In addition, this meter can perform absolute field measurements of up to +/-1500 milligauss (compare to the earth field of 200 to 600 milligauss). This absolute measurement function is handy for checking the effectiveness of demagnetization steps and for other research and process monitoring with magnetic materials.
The Air Shipment Milligauss Meter is accurate +/-2% of reading in the temperature range 30°F - 120°F or -1C to 49C (IATA and FAA regulations only require +/-5%) and comes with certification traceable to NIST. It has a 4 ½ digit display which reads up to +/-199.99 or +/-1999.9 milligauss (selected by the RANGE knob. Accuracy guaranteed up to +/- 1500 milligauss).