3M 963, Инструкция по эксплуатации

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7
Section 7.
Performance Verification
The 963/963E Benchtop Air Ionizers
are factory adjusted to provide
optimum performance. Further
adjustment in the field is not possible.
However, the following instructions
can be followed to determine whether
the Ionizer is performing to
specification. The testing follows the
procedure outlined in the standard for
Ionization, ANSI/ESD S3.1. Please
refer to this standard for more
complete information.
7.1 Equipment Needed
3M 711 Charge Analyzer or
equivalent charge plate monitor
(CPM). If an alternate CPM is
used, please refer to its Operating
Manual for details on how to
perform the following instructions.
7.2 Static Discharge Time
The 963/963E Benchtop Air
Ionizer will reduce the charge on
the 6" x 6" square isolated metal
plate on the CPM from ± 1000
volts to ± 100 volts in less than 1
second (High fan speed). The
metal plate for the CPM must be
located at a distance of one foot
(30cm) from the ionizer and
centered in the air stream.
7.21 Attach the flat plate electrode to
the 711. Refer to the owner's
manual for the 711 for complete
operating instructions.
7.22 Place the 711 on its side allowing
for viewing of the display.
Position the 711 so that the plate
is parallel to the ionizer at a
distance of one foot. The plate of
the 711 should be centered (up &
down, left & right) in the air
stream. It may be necessary to
raise the ionizer from the surface
to allow for centering on the
711charge plate. If so, use a
block of appropriate height to
elevate the 711. Please note that
the plate must be kept totally
isolated from ground and that the
edge of the plate should be raised
up a minimum distance of 3
inches from the work surface.
This is illustrated in Fig. 11 of
ANSI/ESD-S3.1.
7.23 Turn on the ionizer at high speed
and allow it to run for five
minutes.
7.24 Charge the plate positive as
described in the 711 operating
instructions for "Static Decay
Time" mode. Observe the
discharge time indicated on the
711. Repeat this step for
negative polarity.
7.3 Ion Balance
The ionized air blower will stay
within an offset voltage of +/-15
volts (max. deviation from zero)
at a distance of one foot, when
measured using the following
procedure.
7.31 Position the ionizer and CPM as
stated above in Section 7.22.
7.32 Turn on the ionizer at high speed
and allow it to run for five
minutes.
7.33 Use a ground wire to ground the
charge plate of the 711. This will
remove any/all residual charge
present on the charge plate. If
the CPM does not zero, adjust
the zero control.
7.34 Remove the ground wire and
observe the display on the 711.
The voltage (either ±) observed
during this time is the "offset
voltage" and is a measure of
instantaneous ion imbalances
produced by the ionizer.