3M 718 Manuel d'instruction - Page 3

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3M 718 Manuel d'instruction
1.0 Description
The 3M™ 718 Static Sensor is a portable
handheld instrument used for locating and
measuring electrostatic charges. It can be
used to locate ESD trouble-areas, and is a
valuable tool for the ESD-control
engineer. Used in conjunction with the
3M™ 718A Air Ionizer Test Kit (available
separately), it can be used for verification
and auditing of air ionizers.
The 718 Static Sensor is battery-powered
and has several measurement features:
Range: measurements can be taken in a 0-
2 kV or 0-20 kV range.
Automatic Zero: pushbutton feature
allows easy adjustment to zero. No screws
or dials to turn.
HOLD function: allows the User to
"freeze" a displayed measurement, for
later evaluation.
Automatic shutoff: conserves battery
power by shutting off the instrument after
20 minutes of inactivity.
2.0 Power Requirements and
Battery Installation
2.1 Both the 718 and 718A Charger us
DC 9V power supplied by a 9V
alkaline battery.
2.2 To install the battery on either unit:
2.2.1 Remove the battery cover, located in
the lower back of the unit. To do
this, press down on the cover and
slide it downward.
2.2.2 Pull the battery connector out of the
housing, and align the male/female
ends of the connector with the
proper terminals on the battery.
2.2.3 Connect the two, and place the
connected battery into the housing
by inserting the connector end first,
then following up with the other end
of the battery.
2.2.4 Replace the cover.
2.3 The 718 Static Sensor has a Low
Battery indicator. Once the battery is
depleted to approximately 6.5 volts,
the instrument will show BAT in the
display. At this time, the 718 will not
produce accurate results and the
battery should be replaced. A fresh
alkaline battery should last greater
than 50 hours, when the instrument is
in continuous usage.
2.4 The 718A Charger also has a low-
battery indicator. This is an LED
located at the left-hand side of the
unit. When the battery voltage drops
below operating level, the LED will
light up. At this time, the user should