3M 718A Manuale d'uso - Pagina 10

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5.2

Calibration: the 3M

718A products are supplied by the factory pre-calibrated. 3M does not

specify a minimum calibration cycle for the Static Sensor 718 or Air

Ionizer Test Kit 718A products. The user, usually according to internal

Quality procedures, determines calibration cycles. In the event that the

user wishes to perform a self-calibration, the following steps should be

followed for the Static Sensor 718 (user-calibration not possible on the

Air Ionizer Test Kit 718A).

Equipment Needed:

5.3

Test Fixture High-Voltage Power Supply, capable of supplying voltages

up to 10,000V

Voltmeter, with > 50 kΩ input impedance, capable of measuring voltages

down to the μV range.

Cable with a 3/32 inch (2.5 mm) mono plug and secondary connector to

interface with voltmeter.

5.4

Test fixture:

Metal plate of at least 5 square inches area

(38.7 cm

) area.

Metal stand capable of supporting Static Sensor

718, and holding it one inch (2.54 cm) away

from the metal plate, centered.

Connectors on the plate with which it can

interface with the high voltage power supply.

Connections on the metal stand with which it

can be connected to electrical ground.

5.5

Procedure:

5.5.1 Place the Static Sensor Static Sensor 718 on the

metal stand. Verify that it is exactly one inch

(2.54 cm) away from the metal plate, and that its position is centered

relative to the plate.

5.5.2 Connect the stand to ground.

5.5.3 Turn on the Static Sensor 718 and set it to the low range.

5.5.4 Ground the plate. Zero the display.

5.5.5 Remove the ground from the plate, and connect it to the high voltage

power supply. Apply a 1 kV charge to the plate.

Static Sensor 718 and 3M

™

Air Ionizer Test Kit

™