3M 718A Manuale di istruzioni - Pagina 6
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3.7 Continuous Output: an output jack is
provided on the front of the 3M™
718 Static Sensor. This output can
be used to feed a continuous signal
into a data storage device for
continuous monitoring of measured
voltages. Please use a 3/32 inch (2.5
mm) mono-phone plug to connect
into the output jack. The output is
designed to drive a digital voltmeter
with an input impedance of greater
than 50 kΩ. The output signal is
dependent on the measurement range
currently selected. For the low (2
kV) range, the output signal is 1/1000
of the measured electrostatic voltage.
For the high (20 kV) range, the
output signal is 1/10,000 of the
measured voltage.
3.8 Automatic Shut-Off: the 718 Static
Sensor will automatically shut-off 20
minutes after the last switch activity.
This is done in order to conserve
battery power. In the event that the
user needs to have the unit stay ON
continuously, when turning the unit
on depress the POWER AND
RANGE switches simultaneously.
This deactivates the Automatic Shut-
Off feature. The BAT indicator will
then flash three times to indicate that
the automatic shut-off features has
been disabled. The Automatic Shut-
Off feature will reset itself the next
time the instrument is turned on.
4.0 Operation and Use of the
718A Air Ionizer Test Kit
It is recommended that the user be familiar
with ionizer test standards ANSI/ESD S3.1
and draft standard ESD DSP3.3 if the
3M™ 718A Air Ionizer Test Kit is used to
perform verification testing on ionizer
performance.
4.1 Assembly: slide the charge plate over
the 718 Static sensor until it stops.
The charge plate slides onto the lower
groove, on the sides of the 718.
4.2 Charging the plate: holding the 718
Static Sensor (with charge plate
attached) in one hand, use the other
hand to touch the probe of the 718A
Charger to the charge plate. Press
+
either the
button (for a positive
voltage) or the
voltage), then remove the probe from
the charge plate. Be sure to keep the
button pressed while removing the
probe from the charge plate. The
display on the 3M™ 718 Static Sensor
will indicate a positive or negative
charging voltage (1.1kV minimum).
If a voltage of less than ±1.1kV is
displayed, check to see if the low
battery indicator on the 718A Charger
is illuminated. If illuminated, replace
the battery in the charger. If the unit
continues to supply an incorrect
voltage to the charge plate, please
contact 3M for additional instructions.
–
button (for a negative