Applied Physics Systems 113D User manual

DOC PN:260-0004 DOC DESC: Model 113DUser Manual SEPTMEBER 2022. REVISION: 0A
APPLIED PHYSICS SYSTEMS, INC. | APPLIEDPHYSICS.COM
1
MODEL 113D
FLUXGATE MAGNETOMETER
USER MANUAL
CONTACT US
HEADQUARTERS
425 Clyde Avenue Mountain View, CA 94043
OFFICE
650.965.0500
EMAIL
[email protected]m
APPLIEDPHYSICS.COM

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COPYRIGHT
Copyright 2014 - 2022 Applied Physics Systems Incorporated.
All Rights Reserved.
The contents of this manual may not be reprinted in part or whole without
permission.
The contents of this manual are subject to change without notice.
TRADEMARKS
All other brands or products mentioned are trademarks or registered trademarks
of their respective holders and should be treated as such.
CONTACT INFORMATION
Applied Physics Systems
Corporate Headquarters
425 Clyde Avenue
Mountain View, California 94043 USA
Phone: [phone]
Email: [email protected]
Web: www.appliedphysics.com
Technical Support Hours:
Monday - Friday
9:00 AM - 5:00 PM
Pacific Standard Time
DOCUMENT NUMBER
260-0004 rev. A

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REVISION HISTORY
Revision
Description
Date
1
Initial draft of this manual.
June 2015
A
New Format
Sept 2022
TABLE OF CONTENTS
MODEL 113D .................................................................................................................................... 1
FLUXGATE MAGNETOMETER ................................................................................................................... 1
COPYRIGHT........................................................................................................................................................................2
TRADEMARKS....................................................................................................................................................................2
CONTACT INFORMATION...........................................................................................................................................2
DOCUMENT NUMBER....................................................................................................................................................2
REVISION HISTORY .........................................................................................................................................................3
FIGURES .................................................................................................................................................... 4
TABLES ...................................................................................................................................................... 4
1–INTRODUCTION........................................................................................................................................................ 5
2-SYSTEMSPECIFICATIONS .................................................................................................................................. 6
3-MECHANICAL FEATURES .................................................................................................................................... 8
4-ELECTRICAL INTERFACE...................................................................................................................................... 9
5–INITIAL SETUP OF THE SYSTEM .......................................................................................................................10
6–OPERATION OF SYSTEM .................................................................................................................................... 12
7–MODEL 113D BINARY MODE PROTOCAL.....................................................................................................13
8-DESCRIPTON OF THE SYSTEM INTERAL CONSTANTS.........................................................................15
9-CHANGING THE BAUD RATE............................................................................................................................16
10 -AVERAGING DATA ACQUISITIONS............................................................................................................. 17

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FIGURES
Figure 1. Model 113D Magnetometer................................................................................................................ 8
Figure 2. Electrical Interface for Model 113D Sensor............................................................................. 9
TABLES
Table 1. System Specifications........................................................................................................................... 6
Table 2. Serial IN and OUT Connections...................................................................................................... 11
Table 3. Commonly Used Byte Constants................................................................................................15
Table 4. Model 113D Commonly Used Float Constants....................................................................16
Table 5. Baud Rates..................................................................................................................................................16
Table 6. Byte 23 Value for Averaging Data Acquisitions ................................................................ 17
Table 7. Model 113D Float Constants ............................................................................................................. 17
Table 8. Byte Constant Numbers and Their Meanings....................................................................19

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1 – INTRODUCTION
The Model 113D Sensor is a tri-axial vector magnetometer system with a high-
speed digital interface that can transmit XYZ magnetic field values at up to 140
times per second.
The 113D System contains a microprocessor and a three channel 16-bit analog to
digital converter. The system also contains a temperature sensor. The functions
performed by the system microprocessor and A to D subsystem are: 1) conversion
of the sensor analog outputs to digital form; 2) calibration of the sensor scale,
offset and alignment; 3) implementation of serial communications between the
system and an external computer.
The 113D System communicates with the outside world over a bi-directional RS232
serial interface. An ASCII character command language has been created to
facilitate communication with the 113D. For instance, if the ASCII characters for 0, S
and D are sent in sequence, the 113D interprets this as a "send data" command and
responds by sending over the serial interface an ASCII string representing the value
of the magnetometer and temperature outputs. The leading zero in this sequence
denotes the system serial number.
An autosend data mode is included in the 113D software. When this mode is active,
data is automatically repeatedly sent out the serial port after power is applied to
the system.
The 113D magnetometers are calibrated by mounting the system in a precision
holding fixture, placing this in a 3-axis Helmholtz coil and systematically applying
known magnetic fields to the sensor. System calibration can be performed at a
base temperature (usually 25°C) or as an option over a temperature range (for
example 0-75°C).
When the system is calibrated over a temperature range, data is read from the
system at temperature intervals between the minimum and maximum
temperature specification. For instance, for calibration over the interval of 0-75°C,
data is usually read at 25°C temperature intervals at 0°C, 25°C, 50°C and 75°C. The

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data taken at each temperature includes scale, offset and sensor alignment data.
The recorded data is then used to create a look up table for scale, offset and
alignment corrections. This table is then downloaded into the 113D internal EEROM
memory where it can be accessed by the system internal microprocessor.
Corrections to the sensor data can then be made by the internal microprocessor
system before data is transmitted.
2 - SYSTEM SPECIFICATIONS
Table 1. System Specifications
Specifications are subject to change without notice.
ELECTRICAL
Input Voltage Range
+4.95 to +12 VDC
Current Draw
80 mA @ 5.0 VDC
Digital Output Protocols
RS232 and TTL
Digital Output Formats
ASCII and Binary
Baud Rate (User Selectable)
300, 1200, 2400, 4800, 9600 (default)
Data Rate in Autosend Mode
ASCII mode: 70 transmissions/sec
Binary mode: 1400 transmissions/sec
Analog to Digital
16-bit
ENVIRONMENTAL
Operating Temperature
Range
0°C to +70°C
Shock
1000 G 1 ms half sine wave
Vibration
10 G RMS random 50 Hz to 500 Hz
PERFORMANCE
Range
±6.0x104 nTesla (±0.6 Gauss)
1.0x105 nTesla (1 Gauss) optional
Resolution
2 nTesla (20 μGauss)
Accuracy @ full-scale
±1%
Noise Level
±0.5 nT (±5 μGauss) peak-to-peak
Frequency Response
70 Hz
PHYSICAL

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Width/Length (PC board)
2.5” (63.5 mm)
Height (PC board)
0.625” (15.88 mm)
Weight
25 g
Input/Output Connections
Flying leads (Teflon insulated) #26 gauge >6”
(152.4 mm) length

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3 - MECHANICAL FEATURES
An outline drawing of the 113D System is shown in Fig. 1. The orientation of the X, Y
and Z axes and the approximate location of the magnetometer sensors is also
shown in Fig. 1. The output polarity sense of the axes is such that a field pointing
in the direction of the arrows shown in Fig. 1 will produce a positive output
voltage. For example, if the X axis magnetometer is pointed north, then the
output will be positive.
Figure 1. Model 113D Magnetometer

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4 - ELECTRICAL INTERFACE
The electrical interface to the Model 113D System is shown in Fig. 2. Flying leads
(#26 gauge Teflon insulated) are used to make connection to the system. The
function of the output wires is shown in Fig. 2.
Figure 2. Electrical Interface for Model 113D Sensor
RS232 serial communications interface to the 113D is provided by the RS232-in and
RS232-out lines shown in Fig. 2. An external computer talks to the 113D on the serial-
in line and replies from the 113D are transmitted out on the serial-out line. The
serial-in and serial-out lines are normally set to operate at 9600 baud with one
stop bit and no parity. The user, however, can change the baud rate by setting bits
in the system EEROM. The TTL serial-out and TTL serial-in terminals on connector J5
are also serial I/Os for the 113D. These I/Os operate at TTL levels.
Two communication protocols are available: 1) ASCII and 2) BINARY. The ASCII
protocol is based upon sending ASCII characters to the 113D to obtain data. The
113D responds by sending out an ASCII data stream complete with carriage returns

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and line feeds so that it can easily be displayed on a computer terminal. The
binary protocol is used for high-speed computer-to-computer interchange. In this
case, one byte is sent to request data. The 113D then responds with a data packet
containing the desired data.
The binary command of the Model 113D is ASCII 128. This command can typically be
sent from a computer terminal by holding down the ALT key, typing 128 on the
keyboard number pad and then releasing the ALT key.
The Model 113D response to this command is of the following form:
<SOT> <MX><MY><MZ><MT><TEMP><ANAI><data check sum><EOT>
See section VII for more details of binary transfer protocol.
5 – INITIAL SETUP OF THE SYSTEM
In order to operate the Model 113D, power must be applied to it and an interface
with an external computer must be set up. The 113D can be powered from dual
input voltages of 4.9V to 12V or optionally, from a single 4.9 to 12V supply.
In order to set up a computer interface with the system, select the output protocol
of the 113D. This can be either TTL or RS232. The TTL protocol is usually used in
microprocessor-to-microprocessor communications. For this mode, the voltage
levels for a 0 and 1 are approximately ground and 5V. In the idle or marking state,
the output level is +5V.
Since PC’s use RS232 protocol, they can be directly connected to a 113D employing
this protocol. PC’s use either a 25 pin or a 9 pin D connector to implement their
serial ports. This connector is always a bulkhead male connector on the PC
chassis. The serial-in, serial- out and ground connections for these connectors are
as follows: