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Stefan Mayer Instruments
MK-3
Triaxial Magnetic Field
Compensation System
User's Manual
valid for instruments with serial number 228 and higher
with auto-reset function
– April 2022 –
Stefan Mayer Instruments GmbH & Co. KG
Hans-B¨ o ckler-Str. 21 c, D-46535 Dinslaken, Germany
Tel./Fax: +49 2064 479762/3
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Table of Contents
Summary of Contents for Stefan Mayer Instruments MK-3
- Page 1 Triaxial Magnetic Field Compensation System User’s Manual valid for instruments with serial number 228 and higher with auto-reset function – April 2022 – Stefan Mayer Instruments GmbH & Co. KG Hans-B¨ o ckler-Str. 21 c, D-46535 Dinslaken, Germany Tel./Fax: +49 2064 479762/3...
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Page 2: Table Of Contents
Contents 1 Safety precautions 2 Introduction 3 Main frame with power supply and current sources 4 Preamplifier 5 Magnetometers 6 Filter modules 7 Operation and adjustment 7.1 Gain adjustment ......8 Specifications 8.1 Magnetometer specifications . -
Page 3: Safety Precautions
If the instrument is used in a manner not specified by the manufacturer, the protection provided by the instrument can be impaired. Stefan Mayer Instruments shall not be liable for any direct, indirect, special, incidental or consequential damages arising out of the use of its instruments. -
Page 4: Introduction
MRI scanner due to its large DC magnetic field. Therefore, the sensors are usually placed outside of the shielded MRI room, whereas the compensation coils are installed inside the MRI room. The MK-3 is a feed-forward controller with manually adjustable gain. -
Page 5: Main Frame With Power Supply And Current Sources
3-axis compensation coils, three fluxgate magnetometers, filter modules, and a 3-channel preamplifier. Compensa- tion coils are not part of the MK-3 and must be provided separately. The mains power connector and switch as well as connectors for sensors and com- pensation coils are located on the rear panel. -
Page 6: Preamplifier
The amplifier module contains window comparators which automatically reset the corresponding magnetometer in case of an overrange condition, see section 5. The MK-3 can be configured for single axis compensation with 1 to 3 sensors. Jumper settings on the preamplifier board can be changed to add the filtered X, Y, and Z magnetometer signals to the Y channel while the X and/or Z channel are deactivated. -
Page 7: Filter Modules
The scale factor is 3 V/100 T in range 199.9 T (RANGE switch up) and 3 V/10 T in range 19.99 T (RANGE switch down). The scale factor of the signal internally routed to the filter module does not depend on the range switch position and is 3 V/100 T. -
Page 8: Operation And Adjustment
MRI magnet. the external magnetometer sensing axis is aligned with the corresponding MK-3 sensor axis X, Y, or Z. If more than one filter channel (DC, 16.7 Hz, or 50 Hz) have to be activated it is recommended to start with the DC channel. -
Page 9: Specifications
Specifications Magnetometer specifications Display 3.5 digits LED display with sign Measurement range 19.99 T and 199.9 T Resolution 10 nT Noise 0.7 nT RMS Accuracy 0.5 % 25 nT 1 Digit Max. field at sensor 500 T Analog output 0.03 V/ T or 0.3 V/ T depending on range switch position, short cir- cuit protected, BNC connector Output voltage range... -
Page 10: General Specifications And Environmental Conditions
General specifications and environmental conditions Power supply built in, 115/230 V 10 %, AC 50 to 60 Hz, max. 2.0 A Power cord ratings 250 VAC, 10A Operating temperature 5 to 40 C Maximum relative humidity 80 % up to 31 C, decreasing linearly to 50 % at 40 C Maximum operating altitude 2000 m...
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