3M 718A Manuel d'instruction - Page 4

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3M 718A Manuel d'instruction
replace the battery. Usage of the
3M™ 718A Charger under low-
battery 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 liquid-
crystal 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 1-
inch (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.