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To measure induced electrostatic fields such as ionizer imbalance, first zero the
meter as above then hold it in front of the ionizer or other field being measured
and monitor the meter reading.
To utilize the Model 204 as an electrostatic fieldmeter, remove the Charged
Plate Detector by pulling down on the tab to unsnap it from the ground snap and
then slide it forward. Turn on the POWER, depress the green ZERO/RESET
push button for approximately 1 second to zero the meter. If a reading other
than 000±2 is indicated, zero the meter using the ZERO control. If an offset is
required adjust the ZERO control at this time. CAUTION: When zeroing the
meter make sure it is pointing away from any electrostatic fields. Covering
the front of the meter with the hand will shield the input from any fields
present.
Bring the Meter towards the surface being measured. At a distance of 1"
(25mm), read the magnitude and polarity. Multiply the reading on the DPM by 10
to obtain the actual voltage being measured. (The meter is permanently set to
read 2000V full scale for the CPM mode.) All measurements are normally
referenced to the potential of the user who may or may not be at ground. To
obtain a solid ground reference, connect the Analyzer to ground using the coiled
cord provided.
To return the Model 204 to the charged plate analyzer function, install the
Charged Plate detector by sliding it over the front of the unit and snapping it
onto the ¼" (6mm) snap located on the bottom of the instrument.
4.0 TEST PROCEDURES
The Model 216 Charged Plate Analyzer Kit is capable of performing many of the
tests normally performed with laboratory grade equipment. The following
describes recommended procedures for performing the most common CPM
tests.
4.1
Ionizer Balance
This test is performed with either the Charged Plate detector attached or
with the addition of the 6"x6" (152x152mm) detector plate. Turn on the
ionizer. Hold the Analyzer approximately 12" (30cm) in front of the ionizer.
Momentarily ground the detector plate by touching it with a finger or a
grounded lead.
reading for approximately 15 seconds. The meter should read typically
less than ±30 Volts or whatever maximum balance limit is specified.
4.2
Static Propensity
This test is the measurement of static charge build-up on personnel
walking across a floor or performing a defined step test. It is used to
evaluate flooring and footwear. However, this test procedure also applies
to any activity that results in a static charge being generated.
Make sure the DPM reads zero. Observe the meter
8
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