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01 INTRODUCTION
The PFM-711B is an accurate, portable electrostatic field measuring device that is easy to use and
designed for one hand operation. The PFM-711B is a digital, electronic chopper design, which allows
the instrument to make electrostatic field measurements in areas where ionized air is present.
For accurate, repeatable performance, the PFM-711B must be grounded during normal operations.
Used by itself, the PFM-711B will measure electrostatic fields emanating from virtually any flat
surface or object.
The PFM-711B uses a dual range for measuring surface voltage and electrostatic potentials. In the
kV/inch range, the PFM-711B will indicate electrostatic field voltage from 0 to ±20,000 volts in 10 volt
increments at a distance of 1” (25 mm) from the charged surface with an accuracy of ±5%
of the
displayed value.
In the V/inch range, the instrument measures field density from 0 to ±1,999 volts in 1 volt increments
at a distance of 1” (25 mm) from the charged surface with an accuracy of ±5%
of the displayed value.
The two LED ranging lights help position the meter
at the right distance from a charged object for
accurate measurements.
The conductive case and ground snap provides the ground reference for its measuring circuit. For
accurate measurements, it is necessary that the person holding the meter be properly grounded, or
the meter has a ground connection made to the metal snap on the case.
By attaching a CPM-720B Charge Plate to the PFM-711B, the meter can also be used for Ion Balance
voltage measurements.
The PCS-730B can be used to place a ±1000V charge on the CPM-720B Charge Plate making it
possible to also measure the discharge times of air ionization equipment per ANSI/ESD SP3.3 Periodic
Verification of Air Ionizers.
