Hall Effect Probe
Newsletter – Using the Handy Hall Effect Probe
Hall Effect Probe Brochure
TeachSpin's HE1-A Hall Effect Probe is a rugged
and versatile device that produces a low impedance output
voltage directly proportional to the magnetic field at its
sensors. It can measure both the radial and transverse
components of the field at a given region of space. It can
measure both constant and low frequency alternating magnetic
fields. The HE1-A is a high sensitivity device capable of
measuring the magnetic field created by a 10 ampere current
flowing in a long straight wire at a radial distance of up
to one half meter.
The probe has two gain settings that give the instrument a
large dynamic range. It has a linear response to better
than 0.1% over the entire range. The manual zero adjust
allows the operator to set the output voltage to zero in
the local ambient Earth's magnetic field. HE1-A has its
own power supply that plugs directly into a standard wall
outlet of 110VAC. An analog or digital voltmeter is needed
to determine the output of the probe. TeachSpin recommends
a digital voltmeter capable of measuring millivolts, since
the instrument has a maximum sensitivity of about
10-3 mT/mV and a voltage stability of 2mV. The
maximum output is +/- 11 volts.
HE1-A is not calibrated. The job of calibration is left as
an exercise for the student or it can be done by the teacher.
We recommend using a Helmholtz pair, such as the one provided
since the field is very uniform in the central region between
the two coils. Data set 1 is a typical calibration curve using
our MF1-A coils. Data set 2 shows the magnetic field as a
function of radial distance from a long straight wire carrying
10 amperes of current.
The probe is available with a handsome non-magnetic stand made of hardwood,
aluminum and brass components. The probe has a built in ring stand clamp
made of aluminum with nylon thumb screws. As with all of TeachSpin's
instruments, HE1-A is warranted for two years.