Bartington Helmholtz Coil, Installation And Calibration, Page: 6 / 19

HELMHOLTZ COIL INSTALLATION AND CALIBRATION
Figure 2: Generator Tab - Offsets
In the read tab, the settings should be set to:
o
Set the readings as DC.
o
Select the appropriate data to be read (AUX X Y and Z if the sensor is connected to the
Auxiliary input, or DUT X Y and Z if connected to the Device Under Test port).
o
Press start read. You can select to switch between field amplitude readings or voltage
readings. If using the field amplitude reading, ensure that you are selecting the correct
measuring range for the sensor. On the Mag-13, the number that follows is the full range
of the sensor and corresponds to 10V.
The aim is now to trim the Static field offsets potentiometers (see Figure 1 ), and adjust these until the
field obtained is the lowest achievable. To release the potentiometers, release the locking nut until the
potentiometer can turn.
The minimum field value which can be achieved will be coil dependent, and also dependent on the
background noise. You should however be able to achieve field levels in the nT to few tens of nT range.