Measurement Of Static Magnetic Fields - Aaronia NF-5030S Manual

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9.0 Measuring static magnetic fields

Measurement of static magnetic fields (Option 006)

Activating the sensor

To measure static magnetic fields like the earth's magnetic field or that of regu-

lar magnets, you will need our internal static magnetic field sensor (option 006).

Static mode is automatically activated when you set fLow=0Hz and fHigh=0Hz.

Now, choose the sensor and/or axes in the SENSOR menu (or key 6). Available

choices are (X-MSta, Y-MSta, Z-MSta). Obviously, as a static magnetic field has

a frequency of 0Hz, there is no spectrum display. Instead, a time domain dis-

play is provided (if the selected sampletime is above 77mS), i.e. level changes

are displayed on a time axis. The speed of this time domain display can be chan-

ged in the SpTime menu (or key 6). If you set the sampletime lower then 77mS

you will get a direct level display instead. Setting up the sampletime can be done

in the menu SpTime (key 8).

The measurement

the magnetic field. That's why even detailed maps of the geomagnetic field are

available (see image example).

Distortion of the geomagnetic field due to a bigger metallic obstacle, such as a

spade, can still be detected by SPECTRAN even from some distance.

The 24Bit option (option 009) increases the sensitivity yet further and allo-

ws the detection of even very minimal changes. Therefore it is perfect sui-

table for geomagnetic analysis or for accurate measurements of regular

magnets.

Currently, the static magnetic field sensor does not have a zero reference, i.e. it

can only display DIFFERENCES in field strength. A zero reference and conse-

quently a calibration is only possible with our zero-gauss-chamber. Then even

the direct value of static magnetic field can be displayed.

The earth is a huge magnet surrounded by a magnetic

field. The magnetic flux density varies between 30 µT

and 60µT depending on your location. In Germany, a

flux density of approx. 45µT is common.

This so-called geomagnetic field can be drastically

influenced by construction materials in buildings.

Therefore the results of indoor measurements will dif-

fer significantly depending on the location.

Even "in the field", measurement results can differ

widely as the earths geophysical characteristics distort

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