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 (mG).
• 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 eight gain levels to provide higher output voltage resolution as
required.
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 either Microsoft Windows 95/98 or Windows NT 4.0
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
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 μ 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.
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.