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Introduction
Magnetic susceptibility corresponds to the ability of a material to be magnetized in an external field. Bulk (volume) susceptibility χvol can be directly related to the relative permeability (μr ) of a material: χvol = μr - 1 and where μr is the ratio of permeability of material/permeability of vacuum.
Figure 1. Magnetic susceptibility of common rocks (from Bartington User Manual)
Instrument settings
Instrument units
The instrument is pre-set to display the susceptibility value directly in either SI or CGS units.
Numerical conversion from SI to CGS units (Table1) is accomplished by dividing the SI value by 4π, i.e. χCG = χSI/4π. The MS2 meter performs this function internally but by using the constant 0.4π to keep the numbers in a similar range of magnitude.
Table 1. Mass and volume magnetic susceptibility in SI and CGS units (from Bartington User Manual)
Instrument range selection
The instrument is pre-set to display the susceptibility value in either the 1.0 or 0.1 range. Table 2 shows the exponent value of the least significant digit (i.e. the last digit on the LCD) for each range. The units in Table 2 is for volume susceptibility.
Table 2. Exponent values for least significant digit in 1.0 and 0.1 ranges (from Bartington User Manual)
On the 0.1 range a decimal point will be displayed, effectively moving all the digits on the LCD to the left when compared with the 1.0 range. It should also be noted that one measurement in the 0.1 range will be an average of multiple readings taken over a period of 10 seconds.