3M 718A Gebruikershandleiding - Pagina 7

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3M 718A Gebruikershandleiding
and return to floating measurement, momentarily press the HOLD switch
once again. Please note that during HOLD condition the distance indicating
LED's are turned off.
3.5
Zero adjustment: the 3M
718 has a zero adjustment function, which
sets a zero reference point for all subsequent
measurements. This zero reference can be
set by pointing the instrument at a known
zero-voltage surface, and holding down the
RANGE/ZERO button for longer than 3
seconds. After 3 seconds, the display will flash
and adjust to zero. Repeat this step for both the
low and the high ranges. The zero adjustment
should be performed every time the unit is
turned on.
3.6
Measurement Accuracy:
3.6.1 Distance Indicator: the Static Sensor
718 is factory calibrated to give accurate
measurements when it is placed one inch
(2.54 cm) away from the object to be
measured. To assist the user in gauging this
distance, two light-emitting diodes (LED's) are present on the front face
of the instrument. These LED's emit two red, bullseye targets on the
surface of the object being measured. As the instrument gets closer to the
one inch measurement distance, the bullseyes begin to converge. When
they converge and become one, the instrument is approximately one inch
away, and the measurement can be made.
For more accurate measurements, it is recommended that the user
manually measure the distance between the front housing of the
instrument and the object being measured.
3.6.2 Accuracy and Size of Object to be Measured: the minimum surface
area on an electrostatically charged object which can be accurately
measured is a 5 square inch (32.3 cm
3.6.3 Measurements from Greater than One Inch (2.54 cm) Away: in the
event that a one inch separation between object-to-be measured and the
Static Sensor 718 cannot be achieved, it is possible to get approximate
readings. Please contact your 3M representative for additional
information.
Static Sensor
) area.
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