ETS-Lindgren HI-3603 VLF Survey Meter - Manual (Page 12)

HI-3603 VDT/VLF Survey Meter
© ETS-Lindgren, August, 2005
Revision E, Part # H-600042
12
The HI-3603 VDT/VLF Radiation Survey Meter package includes
the Readout-Sensor Assembly, batteries, fitted carrying case,
and a user manual.
Instrument accuracy is derived from a field calibration using a
one meter diameter pair of Helmholtz coils for establishing an
accurately known magnetic field strength and a transverse
electromagnetic (TEM) cell for creating a known electric field
strength. In the case of the Helmholtz coils, a precisely controlled
and measured sinusoidal current is driven through the coils and,
based on the dimensions of the coils, the magnetic field strength
in milliamperes per meter (mA/m) is calculated (Tell, 1983). For
electric fields, a sinusoidal voltage impressed across the cell, is
directly measured and, using the spacing between the TEM cell's
septum and wall, the electric field strength in volts per meter
(V/m) is determined as the voltage difference divided by the
spacing (Mantiply, 1984). In each case, both currents and
voltages in the calibration set-ups are determined with a true
RMS detector.
The HI-3603 indicates magnetic field strength in units of either
milliamperes per meter (mA/m), gauss (G), or tesla (T). Magnetic
field strength may be converted to the different units through the
following relations:
1 mG = 1,000 µG = 80 mA/m
1 mT = 1,000 µT = 800,000 mA/m