Appendix 3. Static eld measurements: WPH-DC
Warning:
• Under high eld conditions (above 30 mT), it is not recommended to connect
the SMP2 directly to the WPH-DC probe as the SMP2 contains ferromagnetic
elements. In these cases, you must use the 5-meter extension cable to keep
the SMP2 as far away as possible.
Important note: if it is suspected that the measuring point may perhaps have an
elevated eld, it is recommended to carry out a preliminary assessment around that
point, approaching progressively. If it is found that the eld is close to 30 mT, where
the SMP2 will be placed to take the nal measurement, precautions should be taken to
prevent the SMP2 from moving, or using the extension cable as mentioned previously.
• The WPH-DC probe integrates hall sensor technology that allows very high
elds to be measured (up to 10 T) but these sensors have a residual voltage
(without the presence of a magnetic eld) that must be compensated to
perform an accurate measurement. For this, you would have to use the “zero
Gauss” camera delivered with the equipment and make the zeroing of the
probe. (More detail below).
User’s Manual Electromagnetic Field Meter SMP2 P. 68