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BARTINGTON INSTRUMENT
Introduction to the PSU1
Summary
The PSU1 provides a battery backed power supply of ±12 V for the Mag-03 series of three axis fluxgate
magnetic sensors. It also contains filters for the analog outputs of the sensor.
Functional Description
Power
The PSU1 will supply ±12V d.c. 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 the section on
Installing and Replacing the Internal
Batteries.
Signal Buffering
Buffered, single-ended output signals on BNC connectors from differential or single-ended output
magnetometers.
After filtering, each analog 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.
Filtering
Filtering is provided by a low-pass filter and selectable high-pass filter for d.c. or a.c. 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.
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OM2443 ISSUE 1.0
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Troubleshooting
