Bartington Magmeter-2 Manuale utente
Operation Manual for
Magmeter-2
Power Supply and Display 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 Magmeter-2 5
4.1. Summary 5
4.2. Functional Description 5
4.2.1. Power 5
4.2.2. Signal Buffering 5
4.2.3. Filtering 6
5. Magmeter-2 Inputs, Outputs and Controls 6
5.1. Back Panel Connections and Controls 7
5.2. Front Panel Controls 8
5.3. Top Panel Displays 9
6. Installing Magmeter-2 10
6.1. Installing and Replacing the Internal Batteries 10
6.2. Initial Charging of the Battery Cells 13
6.3. Location of the Equipment 13
6.3.1. Potentially Hazardous Locations 13
6.3.2. Orientation 14
6.3.3. Temperature 14
6.3.4. Proximity to Other Equipment 14
6.4. Connecting the Equipment 14
6.5. Initial Settings 15
6.5.1. Magnetometer Output Type Selection 15
7. Using Magmeter-2 15
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7.1. Environmental Precautions 15
7.2. Switching On and Off 15
8. Troubleshooting 16
9. Care and Maintenance 18
9.1. Fuses 18
9.2. Calibration 18
9.3. Cleaning 18
10. End of Life Disposal 19
10.1. Waste Electrical and Electronic Equipment (WEEE) Regulations 19
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1. About this Manual
This manual describes the installation, operation and maintenance of the Magmeter-2 Power
Supply and Display Units. It should be read in conjunction with the product brochure (DS2520)
and outline drawing DR3694 which can be found on the Magmeter-2 product page on the
Bartington Instruments website at: www.bartington.com.
Photographs of key components are included, labelled with numbers.
1.1. Symbols Glossary
This manual provides the information necessary to help customers install and operate the
Magmeter-2 Power Supply and Display Units from Bartington Instruments.
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: The fitting of non-approved battery cells may be dangerous. It could also affect
the safety of users, damage the equipment and invalidate the terms and conditions of the
Warranty.
WARNING: These products are not qualified for use in explosive atmospheres or life
support systems. Consult Bartington Instruments for advice.
Caution: The Magmeter-2 is fitted with AA size NiMH (Nickel Metal Hydride) rechargeable
batteries. Only AA size rechargeable batteries that are specified as compatible in product
brochure DS2520 can be used in this product.
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3. Compatible Magnetometers
Caution: Use of incompatible magnetometers may cause damage to the Magmeter-2 and/
or the magnetometer. The Magmeter-2 is designed to operate with various Bartington
Instruments magnetometers. For the current list refer to product brochure DS2520 or the
product compatibility table at www.bartington.com/product-compatibility.html.
Note: Bartington Instruments cannot advise on the integration of this equipment with any
third party products.
4. Introduction to the Magmeter-2
4.1. Summary
The Magmeter-2 provides a battery backed power supply of ±12V for most of Bartington
Instruments range of single and three-axis fluxgate sensors. It incorporates three LCDs
displaying the real-time DC field or AC field as an RMS value being measured by the connected
sensor. It also provides simple access to filtered versions of the sensor’s XYZ outputs.
Magmeter-2 has a 4⁄ digit display. See product brochure DS2520 for the precise resolutions of
the unit.
4.2. Functional Description
4.2.1. Power
The Magmeter-2 will supply power as stated in product brochure DS2520 for a range of sensors.
The power is supplied from the internal, rechargeable batteries or from the plug-in power
adaptor, which is also used to charge the Magmeter-2 batteries.
Note: When connected to the mains, the Magmeter-2 will operate without any battery cells
being installed. To install or replace defective cells, refer to Installing and Replacing the
Internal Batteries.
Caution: The operating temperature range is altered during battery charging.
4.2.2. Signal Buffering
The input buffer is a differential instrumentation amplifier to minimise loading on input signals.
Note: Output must be selected as Balanced or Unbalanced, using the Magnetometer
Output Type Selector Switch, depending on the type of sensor connected. See
Magnetometer Output Type Selection.
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When Unbalanced is selected, one input of each differential amplifier is connected to Signal
Ground, which is normally joined to Power Ground at the sensor, thereby eliminating the error
caused by voltage dropped in the long Power Ground cable.
When Balanced is selected, both inputs of the differential amplifier are connected to the sensor.
In Balanced mode, the differential signals and input amplifiers give the best possible accuracy.
There is no interaction of signal ground currents and unequal sensor ground potentials caused
by different voltage drops in the Power Ground cabling. Compared to Unbalanced mode, this
configuration has the higher interference noise rejection, as noise will appear as a common
mode signal at the input amplifiers.
After filtering, each analogue signal is fed to the appropriate BNC connector via a low impedance
buffer. These buffers allow long cables to be used with high input impedance data acquisition
systems. Refer to product brochure DS2520 for maximum loads.
Note: Measuring these outputs can lead to a greater accuracy than that displayed on the
LCDs.
4.2.3. Filtering
A permanent low-pass filter and selectable high-pass filter are provided for each channel: X, Y
and Z. Refer to product brochure DS2520 for the cut-off frequency of the filters.
The low-pass filters remove the high frequency noise components of the signal from the sensor.
The high frequency signal is associated with the excitation signal (breakthrough) of the fluxgate
sensor.
The high-pass filters are intended to filter out the DC or static field component so that the
alternating components above the cut-off frequency of the filter can be isolated.
5. Magmeter-2 Inputs, Outputs and Controls
Note: The precise external layout of the Magmeter-2 and Magmeter-2 may differ subtly
but the principles remain the same. Outline drawings for both units are available from the
product page.
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5.1. Back Panel Connections and Controls
1. X Signal Conditioned Output (BNC connector)
2. Y Signal Conditioned Output (BNC connector)
3. Z Signal Conditioned Output (BNC connector)
The 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 low/high-
pass filters.
4. Space for unique serial number
5. Magnetometer socket for the connection of the magnetometer cable
Note: Ensure correct orientation of the connector (indicated by the cut-out on the
connector body aligning with the notch in the socket).
45
321
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5.2. Front Panel Controls
6. Magnetometer Output Type Selector Switch
Balanced (button out)
Unbalanced (button pressed in)
Caution: This switch must be set to match your magnetometer output type to ensure
correct results (see Magnetometer Output Type Selection).
7. DC/AC Coupling (High Pass Filter (HPF) Control)
DC (button out)
AC (button pressed in)
8. Charge LED
9. On/Off LED
10. On/Off Switch
11. Socket for external charging adaptor
6 7 8
9
11 10
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5.3. Top Panel Displays
12. X Signal Value Display
13. Y Signal Value Display
14. Z Signal Value Display
Note: The displays output the RMS value of the analogue output voltages if in AC mode. If
the device is in DC mode, output is given in DC voltage.
15. Scaling Selection Switch
Caution: This switch must be set to the scaling corresponding to your magnetometer
output type to ensure correct results (see Magnetometer Output Type Selection).
Note: Where applicable, scaling parameters are indicated by 1V on Magmeter-2, e.g. the
first switch position on Magmeter-2 is 100µT/1V.
16. Backlight
Note: The button must be pressed and held to enable screen illumination.
15
12
13
14
16
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Caution: Prolonged use of the backlight will increase rate of battery discharge.
6. Installing Magmeter-2
6.1. Installing and Replacing the Internal Batteries
To install the battery cells, or to remove discharged or defective cells, use the following
procedure:
Key: A – Enclosure lid retaining screw B – Enclosure lid retaining screw
C – Earth lead fixing (do not remove)
A B
C
Indice
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