3M 718A Manuel de l'utilisateur - Page 7

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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

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) area.