FGM Triaxial
     Fluxgate Magnetometers

Features
  • Portable, hand held and battery operated
  • Continuous measurement of the x, y and z axes
  • Displays read in milligauss, nanotesla, or microtesla
  • Analog output allows monitoring of all three axes simultaneously
  • The RS 232 connection on the FGM-5DTAA allows remote control and monitoring
  • The FGM-5DTAA also has field nulling, internal data storage and resultant vector calculation capabilities
  • Accuracy of 0.25%
  • Band width response DC to 100 Hz

Applications

FGM-4DTAM
  • Evaluate shielding effectiveness
  • Measure magnetic signature of vehicles
  • Package inspection
  • Monitoring magnetic environments
  • Measure Earth's field vector components
  • Solenoid/Helmholtz coil calibration and control
  • Field Mapping

Single Axis Specifications

 

FGM-4DTAM

FGM-5DTAA

Power

One nine volt battery. Nominal operating power consumption is 153 mW

Two 9 V batteries. Nominal operating power consumption is 550 mW; when powered down 20 mW

Operating Time

Thirty hours continuous operation with a 9V Alkaline battery

24 hours continuous operation with Lithium batteries

Display

4 digit LCD with low battery indicator

Two lines by 16 characters LCD. Viewing dimensions
are 89.4 mm L x 13.7 mm H x (3.54" L x 0.54" H)

Analog Output

2.0 V DC
5 pin microdin connector

2.5 V DC
8 pin minidin connector

Component

X, Y, or Z

X, Y, or Z

R

D2

I3

Range

2000 mG - 200T

1000 mG - 100T

1732 mG - 173T

180 degrees

90 degrees

Resolution

0.1 mG - 0.01T

0.01 mG - 1nT

0.01 mG - 1nT

0.01 degrees

0.1 degrees

Accuracy
Absolute1
Relative1

0.5% F.S., 1 count
N/A

(0.25% of reading + 20nT)
0.25% of reading

(0.5% of reading + 20nT)
0.5% of reading

1 degree
1 degree

1 degree
1 degree

Angular Alignment

3.0 degrees

--

--

See above

See above

Frequency Response

DC - 100 Hz

DC - 100 Hz

DC - 100 Hz

N/A

N/A

Linearity

0.02% FS

0.02% FS

0.02% FS

--

--

The FGM-4DTAM Triaxial Magnetometer is a sophisticated and very accurate instrument. The 4 digit display permits resolution of 0.1 mGauss (0.01 T) in a 1999.9 mGauss (199.9 T) field.

In addition to its high degree of accuracy, it is simple and easy to operate. There are no adjustments to make. Just turn on the power, select the display units that you prefer (milligauss or microtesla) and select the magnetic field vector (X, Y or Z).

The FGM-4DTAM simultaneously measures the three magnetic field vectors in the rectangular coordinate system. The vector component selected manually is displayed on the instrument's LCD. Each of the X, Y, and Z components are available at all times through the analog output.

FGM-5DTAA

The FGM-5DTAA Triaxial Magnetometer is a highly accurate instrument which uses fluxgate technology to measure the three vector components of the magnetic field.

The FGM-5DTAA combines high resolution, accuracy and linearity with the convenience of a portable hand held instrument. It has been designed specifically for measuring weak magnetic fields. The 5-digit display permits resolution of 0.01 mGauss (0.001 T) in a 1000 mGauss (100 T) field with accuracy of 0.25%. In the relative mode, small variations in magnetic fields can be precisely measured in the presence of a large field such as the Earth's magnetic field.

FGM-5DTAA Special Features
In addition to its high level of accuracy, the FGM-5DTAA has a number of unique and special features.

  • Two vector representation allows the user to display either the rectangular  (X, Y, Z) or polar (R, D, I) components of the magnetic field. The polar representation is convenientfor measuring the magnitude and direction of the field. No manual calculations required.
  • The field magnitude can be displayed in one of three common units; nanotesla (nT), microtesla (T), or milligauss (mGauss).
  • The Relative Display Mode permits measurement of changes in magnetic fields from an initial value.
  • Multiple analog outputs make the raw analog magnetometer signal as well as the processed signal available for recording or further processing through an 8 pin microDIN connector. The raw signals are useful for wide band AC field measurements. The processed signal outputs match the selected vector representation values and can be set to one of 8 gain levels to provide higher output voltage resolution as required.

Data Storage

Parameter

Snapshot

Record

Manual

Number of
points:

525

525

525

Duration:

7.5 seconds

30 seconds

User determined

Sample Rate:

69.5 samples/second

17.4 samples/second

User determined

Serial Port:

Three wire RS232 port operating at 9600 baud,
one start bit, one stop bit and no parity.

Angular Alignment:

The X and Y axes sensors are aligned parallel to the base surface and
along its length and width edges, respectively, to within 0.25 degrees.
The Z axis sensor is aligned normal to the base surface within 0.25 degrees. This sensor arrangement represents a right-handed coordinate system.

Analog Outputs

Parameter

DAC Output

Analog Magnetometer

Number:

31

32

Gains:

1,2,4,8,16,32,64,128

None

Voltage Range:

2.5 volts

2.5 volts

Scale Factor:

24.41 x gain µ V/nT

24.41 V/nT

Accuracy:

1% of full scale

5% of full scale

Resolution:

12 bits

Not applicable

Zero Field Output:

0 5 mV

0 5 mV

Frequency Response:

DC to 10 Hz nominal

DC to > 100 Hz

1 Corresponds to actual or relative values based on the selected mode and coordinates.
2 Corresponds to the actual rectangular component values.

FGM-5DTAA Interface Program
The FGM-5DTAA Interface Program is a convenient way to control a locally connected FGM-5DTAA Triaxial Fluxgate  Magnetometer through an RS232 serial communications port of an IBM compatible personal computer (PC) or with a remote FGM-5DTAA over a network. The program runs under the Microsoft Windows operating systems.

With a serial port connection, the FGM-5DTAA Interface can be used to:

  • Set the measurement coordinates to Rectangular or Polar
  • Set the measurement mode of each vector component to Absolute or Relative
  • Acquire and display a single reading or three vector components
  • Activate one of the FGM-5DTAA recording functions (Snapshot or Record)
  • Download the recorded data stored in the FGM-5DTAA data buffer and display it on the strip chart
  • Perform a strip chart recording of the FGM-5DTAA readings at a user selectable sample interval
  • Print the strip chart
  • Save downloaded or strip chart data on disk in a spreadsheet compatible format
  • Retrieve and display previously saved data
  • Record and later display manual data

The strip chart Save, Load and Print functions are available through a menu that pops up when the right mouse button is pressed.

With a network connection, the FGM-5DTAA Interface can be used to:

  • Download data stored in a buffer by the remote FGM-5DTAA network server
  • Download data files logged by the remote FGM-5DTAA server
  • Download the most recent reading taken by the remote FGM-5DTAA
  • Strip chart data as it is being acquired by the remote FGM-5DTAA

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