Bartington SCU1 Manual de usuario
Operation Manual for
SCU1 Signal Conditioning Unit
BARTINGTON INSTRUMENTS
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Table of Contents
1. About this Manual 4
1.1. Symbols Glossary 4
2. Safe Use 4
3. Compatible Magnetometers 5
4. Introduction to the SCU1 5
4.1. Summary 5
4.2. Functional Description 5
4.2.1. Power 5
4.2.2. Signal Conditioning 5
5. SCU1 Inputs, Outputs and Controls 7
5.1. Back Panel Connections and Controls 7
5.2. Front Panel Displays and Controls 8
6. Installing the SCU1 10
6.1. Location of the Equipment 10
6.1.1. Environmental Precautions 10
6.1.2. Mounting 10
6.1.3. Orientation 10
6.1.4. Temperature 10
6.1.5. Proximity to Other Equipment 10
6.2. Connecting the Equipment 11
6.3. Initial Settings 11
6.3.1. Magnetometer Supply Voltage 11
6.3.2. Magnetometer Output Type Selection 11
7. Using the SCU1 12
7.1. Output Scaling 12
7.1.1. Converting Output Voltage to Magnetic Units 12
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7.2. Over-range Condition 12
7.3. Switching ON and OFF 13
7.4. Using the SCU1 Controls 13
7.4.1. Offset Controls 13
7.4.2. Gain Controls 13
7.4.3. Low Pass Filter (LPF) 14
7.4.4. High Pass Filter (HPF) 14
7.5. Using the SCU1 Outputs and Displays 15
7.5.1. Unconditioned and Conditioned Outputs 15
7.5.2. Display Panel Meters 15
8. Troubleshooting 16
9. Care and Maintenance 17
9.1. Fuses 17
9.2. Calibration 17
9.3. Cleaning 17
10. End of Life Disposal 18
Notes 18
BARTINGTON INSTRUMENTS
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1. About this Manual
This manual provides the information necessary to help customers operate the SCU1 Signal
Conditioning Unit from Bartington Instruments. It should be read in conjunction with product
brochure DS2519, which can be found on the SCU1 product page on the Bartington Instruments
website at: www.bartington.com.
1.1. Symbols Glossary
The following symbols used within this manual call your attention to specific types of
information:
WARNING: Indicates a situation in which serious bodily injury or death could result if the
warning is ignored.
Caution: Indicates a situation in which bodily injury or damage to your instrument, or both,
could result if the caution is ignored.
Identifies items that must be disposed of safely to prevent unnecessary damage to the
environment.
Note: Provides useful supporting information on how to make better use of your purchase.
2. Safe Use
WARNING: These products are not qualified for use in explosive atmospheres or life
support systems. Consult Bartington Instruments for advice.
WARNING: The SCU1 is powered by mains electricity. The unit MUST be earthed. The
centre pin of the IEC inlet on the rear panel is internally connected to all the metal panels
of the unit. Use the 3-core connecting cable supplied with the unit to ensure the unit is
correctly earthed. Use of an alternative cable may render the unit unsafe.
WARNING: The IEC mains inlet socket must be fitted with two fuses of the type specified in
the product brochure.
WARNING: This unit is not sealed against the ingress of water and must only be operated
under dry conditions.
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3. Compatible Magnetometers
The SCU1 is designed to be compatible with the sensors shown on the Product Compatibility
page of the Bartington Instruments website at: www.bartington.com/product-compatibility.html.
Caution: Use of incompatible sensors may cause damage to the SCU1 and/or the sensor.
4. Introduction to the SCU1
4.1. Summary
The SCU1 Signal Conditioning Unit combines the functions of a power supply unit, an
analogue signal conditioner and a display unit for use with compatible Bartington Instruments
magnetometers.
The unit connects to a single three-axis magnetometer and enables the user to monitor the X, Y
and Z magnetic field components via the following outputs:
• unconditioned analogue outputs (signals), direct from the magnetometer
• conditioned analogue signals (the magnetometer signals modified by the SCU1 analogue
conditioning)
• digital display meters.
The SCU1 is suitable for use in many situations including:
• where analogue signals from the magnetometer require adjustment to match the input
requirements of control electronics or of an analogue to digital (A-to-D) converter system
• as a three-axis magnetic field meter, giving a digital display of the X, Y and Z values from
the magnetometer
• where both a digital display and analogue voltage signals are required.
4.2. Functional Description
4.2.1. Power
The SCU1 includes an integral power supply for the attached magnetometer.
4.2.2. Signal Conditioning
The SCU1 applies three stages of analogue processing, converting the unconditioned
magnetometer outputs into the conditioned outputs.
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1. Filtering: Signals can be filtered (using low and high pass filters) to remove unwanted
frequencies.
2. Offset: In the second stage, a DC offset voltage can be added to or subtracted from the
magnetometer output signal, producing a DC adjusted output.
3. Gain: Finally, the DC adjusted output signal can be amplified by a variable gain stage, to
produce the conditioned output signal.
Offset and gain are controlled independently for the X, Y and Z channels, but the filter settings
are common to all three.
The conditioned output signals and the original magnetometer (unconditioned) output signals
are available as analogue voltages from the SCU1. In addition, the DC components of each
conditioned signal are displayed digitally on display meters.
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5. SCU1 Inputs, Outputs and Controls
5.1. Back Panel Connections and Controls
Figure 1. Back panel connections and controls.
Key to Figure 1
1. Unconditioned Outputs. These three BNC connectors provide buffered versions of the X,
Y and Z output signals from the magnetometer. Signals are only valid when the SCU1 is
switched ON. They are not affected by any of the other SCU1 controls.
2. Magnetometer Socket. This multi-pin socket is for the connection of the magnetometer
cable.
3. Magnetometer Output Type Selector Switch. The SCU1 can be used with magnetometers
that have unbalanced (single-ended) outputs or balanced (differential) output signals. This
switch sets the SCU1 to operate in unbalanced or balanced mode.
Caution: This switch must be set to match your magnetometer output type (see
Magnetometer Output Type Selection).
4. IEC Mains Socket (Electrical Supply Input). The unit requires an AC mains supply as
specified in the product brochure via this IEC inlet socket.
WARNING: The socket includes a removable fuse carrier. The correct fuse types must be
fitted. Refer to the product brochure for fuse details.
5. ON/OFF Switch. The IEC inlet socket includes this ON(1)/OFF(0) switch, to control power to
the unit.
1 2 3 4
5
6
BARTINGTON INSTRUMENTS
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6. Conditioned Outputs. These three BNC connectors carry the conditioned analogue output
voltages. The conditioned outputs are the magnetometer X, Y and Z signals after they have
been modified by the filter, gain and offset controls.
5.2. Front Panel Displays and Controls
Figure 2. Front panel displays and controls.
Key to Figure 2
7. Low Pass Filter (LPF) Control. The SCU1 applies low pass filtering to the magnetometer
output signals. This control sets the -3dB point frequency for the LPF.
Note: The LPF cannot be completely disabled.
8. High Pass Filter (HPF) Control. The SCU1 can apply high pass filtering to the magnetometer
output signals. This control sets the -3dB point frequency for the HPF.
9. Magnetometer Supply Voltage Control. This control sets the voltage that the SCU1 supplies
to the magnetometer connector power pins. This enables the user to vary the voltage
to compensate for cable voltage loss, ensuring the required voltage is present at the
magnetometer. See Magnetometer Supply Voltage for guidance on matching voltage to cable
length.
10. Display Panel Meters. The conditioned output voltages for the three channels are displayed
numerically on these 3½ digit meters. The meters display in volts and should only be used for
low frequency signals. See Display Panel Meters for full details on how to use the meters.
7 8 9 10
11121314
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11. Offset Switches (one for each channel). These 3-position switches control the polarity of the
offset DC voltages applied to the magnetometer output signals (see Table 1 below). There is
an individual switch for each of the X, Y and Z channels.
Switch Position Polarity Function
Centre OFF No offset
Up + Offset voltage is added
Down - Offset voltage is subtracted
Table 1. Oset switch functions.
12. Offset Coarse Controls (one for each channel).
13. Offset Fine Controls (one for each channel). These rotary controls set the offset DC voltages
applied to each of the X, Y and Z channels. For guidance on use of the offset controls see
Offset Controls.
14. Gain Controls (one for each channel). These controls set the gain (amplification) that is
applied to each of the X, Y and Z channels.
Note: The effect of the gain control is dependent on the offset voltage. See Gain Controls
for guidance on use of the gain and offset facilities.
BARTINGTON INSTRUMENTS
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6. Installing the SCU1
6.1. Location of the Equipment
6.1.1. Environmental Precautions
WARNING: This equipment is powered by mains electricity. It should not be used in wet or
damp locations, where water may enter the unit and create a safety hazard.
Refer to the product brochure for maximum environmental ratings for the SCU1.
Caution: Exceeding the maximum environmental ratings may cause irreparable damage to
the equipment.
6.1.2. Mounting
The SCU1 can be used:
• free-standing, on a bench-top, or
• mounted in a 19” rack, using the integral side brackets.
6.1.3. Orientation
The SCU1 can be orientated horizontally or vertically.
6.1.4. Temperature
To minimise temperature induced drift effects, position the SCU1:
• in a constant ambient temperature
• out of direct sunlight.
6.1.5. Proximity to Other Equipment
The SCU1 contains no high frequency electronics likely to cause emissions which could cause
interference with other equipment. The unit is unlikely to be affected by interference from other
equipment in the normal operating environment.
Note: The sensors used with this unit, being designed to measure magnetic fields, are
susceptible to electromagnetic interference. Avoid operation close to high frequency
sources of radiation. Interference is indicated by instability in the reading when the sensor
is maintained in a fixed position.
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