3M 718 Instruction Manual
Instruction Manual
3
718 Static Sensor
Safety Information
Intended Use
The 3M™ 718 Static Sensor is a portable,
handheld instrument designed for measuring
voltages associated with electrostatic charge.
Its intended use is for measuring the amount
of voltage, in a range from 0-20 kilovolts,
associated with an electrostatic charge
buildup on a surface. Any deviation from
this intended use could impair the
instrument’s effectiveness and possibly lead
to an unsafe operating condition.
The 3M™ 718A Air Ionizer Test Kit is a
set of accessories for use in conjunction
with the 3M 718 Static Sensor. Their
intended use is for verifying the operation of
air ionizers by measuring the neutralization
time for a static charge placed on a
stationary metal plate. Any deviation
from this intended use could impair the
instrument’s effectiveness and possibly lead
to an unsafe operating condition.
Caution Statements
• The 718 Static Sensor and 718A Charger
use DC 9V power supplied by a 9V
alkaline battery. Usage of any other
power source may cause damage to the
instruments.
• The 718 Static Sensor and 718A Air
Ionizer Test Kit have no user-serviceable
parts. Do not disassemble the products for
any reason. UNAUTHORIZED SERVICE WILL VOID THE WARRANTY.
• The 718 and 718A are NOT designed for usage in hazardous environments where the
possibility of explosion or fire exists.
Read and understand all safety information before installing and operating
this equipment.
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 02 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
replace the battery. Usage of the
3M™ 718A Charger under lowbattery conditions would lead
to insufficient voltage levels
being generated.
3.0 Operation of the 718 Static
Sensor
Supplemental notes:
For accurate measurements during usage,
it is recommended that the outside housing
of the 3M™ 718 Static Sensor be
connected to an electrical ground. This
can be accomplished by having the user
holding the instrument connected to
ground through either a static control wrist
strap, or while wearing static control
footwear. The enclosure of the 718 is
made of conductive plastic and is,
therefore, electrically connected to
whomever is holding the instrument. In
addition, ground for the instrument can be
provided through the Voltage Monitor
Output on the front of the case.
The 718 Static Sensor is a precision
electronic instrument. Improper use or
rough treatment can damage the unit, and
render it incapable of providing accurate
measurements.
3.1 Turning the unit ON and OFF: To
turn on the 718 Static Sensor,
momentarily press down on the
membrane switch labeled POWER.
Determining that the power is on can
be verified by seeing that the liquidcrystal display (LCD) is on, and that
the red light-emitting diodes in the
front of the sensor are lit. To shut off
the 718 Static Sensor, momentarily
press down on the membrane switch
labeled POWER. Determining that
the power is off can be verified by
seeing that the liquid-crystal display
(LCD) is off.
3.2 Making Electrostatic Voltage
Measurements: hold the instrument 1inch (2.54 cm) away from the object
being measured. The display will
update with the voltage measurement
in kilovolts. If the measured voltage
is greater than the measurement range
of the instrument, a –1. will be
displayed. At this time, switch to
a greater range. If over-ranging
occurs even with the 20 kV range
activated, the static charge on the
object cannot be measured with the
718 Static Sensor.
3.3 Measurement Range: all measurements
are in kilovolts (kV) as stated on the
front label of the unit. The 718 has
two measurement ranges: 0-2 kV and
0-20 kV. The unit’s current
measurement range mode can be
verified by checking the display.
Three digits following the decimal
point indicate that the unit is in 0-2 kV
range. Two digits following the
decimal point indicate that the sensor
is in 0-20 kV range. To change
between measurement ranges, press
the RANGE/HOLD button once,
momentarily.
3.4 HOLD Function: in the event that the
user wishes to freeze the current
measurement, the HOLD function of
the 718 Static Sensor may be used.
Simply press the HOLD switch
momentarily and the currently
displayed voltage will be frozen.
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