Si And Cgs Units; Range Selection; Calibration - Bartington MS2 Operation Manual

4.5. SI and CGS units

The instrument may be pre-set to display the susceptibility value directly in either SI or CGS
units. The table below shows the basic mass or volume specific unit thus produced.
SI
CGS
Numerical conversion from SI to CGS units is accomplished by dividing the SI value by 4π, i.e. c
= c /4π. The MS2 meter performs this function internally but by using the constant 0.4π to keep
SI
the numbers in a similar range of magnitude.

4.6. Range Selection

The instrument may be pre-set to display the susceptibility value in either the 1.0 or 0.1 range.
The table below shows the the exponent value of the least significant digit (i.e. the last digit on
the LCD) for each range. The units in the table below for volume susceptibility.
Exponent values for least significant digit in 1.0 and 0.1 ranges
1.0
0.1
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.

4.7. Calibration

All sensors are calibrated either directly or indirectly to the diamagnetism of water (H
density r (rho) = 1.
c
(mass susceptibility of H
mass
Therefore, for H O, c
vol
2
Precise mass specific measurements are only possible using the MS2B sensor where the
sample volume is accurately defined.
BARTINGTON INSTRUMENTS
Mass and volume in SI and CGS units
Mass (c
mass
10 (m /kg)
-8 3
10 (cm /g)
-6 3
SI
10
-5
10
-6
O) is -0.72 x 10
2
= r x c
mass
= 1 x -0.72 x 10 CGS.
-6
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) Volume (c
10
10
CGS
10
10
CGS
-6
)
vol
-5
-6
-6
-7
O), where
2
OM0408/49
CGS