Specifications

BARTINGTON INSTRUMENTS
Page 6 of 18 OM2443/2
6.2. Functional Description
6.2.1. Power
The PSU1 will supply ±12V DC for powering a range of magnetometers. Please refer to the
datasheet for the latest list of compatible products. The power is supplied from the internal,
rechargeable batteries or from the plug-in power adapter, which is also used to charge the PSU1
batteries.
Note: The PSU1 will operate without any battery cells being installed. To install, or replace
defective cells, refer to section 8.1: Installing and Replacing the Internal Batteries.
6.2.2. Signal Buffering
Single-ended output signals on BNC connectors are buffered from differential or single-ended
output magnetometers.
After filtering, each analogue signal is fed to the appropriate BNC connector via a low impedance
buffer. These buffers allow long cables and low input impedance data acquisition systems to be
used. Refer to the appropriate datasheet for maximum loads.
The output common return is also buffered to eliminate crosstalk due to signal currents sharing
the Va common return. A high impedance AC path is also provided between the Va common and
cable screen to improve AC noise performance.
6.2.3. Filtering
Filtering is provided by a low-pass filter and selectable high-pass filter for DC or AC coupling.
A low pass and a high pass filter are included in each of the channels for the signals from the X,
Y and Z axes of the sensor. Refer to the appropriate datasheet for the frequency response of the
filters.
The low pass filters remove the high frequency noise components of the signal from the sensor.
The high pass filters are intended to isolate the DC or static field component so that the
alternating components above this frequency can be measured or analysed.