BARTINGTON INSTRUMENTS
Page 13 of 16
The current drain is independent of the power supply voltage, and the unit will operate with
input voltages down to ±8V. As the output voltage swing is limited to 2V less than the supply
voltage, for a supply of ±8V the output will operate normally with any output b6V and
-6V, representing a field of 0.6 of the full scale value in each direction. The scaling factor and
linearity will remain at the normal value up to this saturation point. The output will remain at
the saturation level if the field is increased beyond this point. Asymmetric supplies may be used,
provided that the minimum and maximum voltages are not exceeded for either polarity.
A1.1. Signal/power ground
The two signal/power ground conductors are connected to a common point within the sensor.
The power supply common (power 0V) should be connected to only one of them, which becomes
the power ground. The other conductor becomes the signal ground and is used as the 0V output
from the sensor. Each signal is then measured between the X, Y and Z output conductors and the
signal ground output. In this way, the signal ground carries no power supply currents.
The minimum current in the power ground conductor is approximately 25mA. On long cables,
this will give rise to an appreciable potential difference between the power supply end and
the sensor end of the power ground conductor. The use of separate power and signal ground
conductors will ensure that this voltage is not included in the voltage measured between the
signal outputs and the signal ground.
