3M 718 Manuel utilisateur

User’s Guide

3M™Static Sensor 718,

3M™ Air Ionizer Test Kit 718A

Table of Contents

Section Page

Safety Information..................................................................................... 2

1 Description................................................................................................ 3

2 Power Requirements and Battery Installation ........................................... 3

3 Operation of the 3M™ Static Sensor 718 ................................................... 4

4 Operation and Use of the 3M™Air Ionizer Test Kit 718A........................ 7

5 Service/Calibration.................................................................................... 8

6 Physical Characteristics (All values typical)........................................... 10

7 Parts Included.......................................................................................... 11

Regulatory Information........................................................................... 12

Warranty.................................................................................................. 13

SAFETY INFORMATION

Intended Use:

The 3M™Static Sensor 718 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 19,900 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™Air Ionizer Test Kit 718A is a set of accessories for use in conjunction

with the Static Sensor 718. 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

•The Static Sensor 718 and 3M™Charger 718A use 9VDC power supplied by a 9V alkaline

battery. Usage of any other power source may cause damage to the instruments.

•The Static Sensor 718 and Air Ionizer Test Kit 718A have no user-serviceable parts. Do not

disassemble the products for any reason. UNAUTHORIZED SERVICE WILL VOID THE WARRANTY.

•The Static Sensor 718 and Charger 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™Static Sensor 718 is a portable handheld instrument used for locating

and measuring electrostatic charges. It can beused to locate ESD trouble-areas,

and is a valuable tool for the ESD-control engineer. Used in conjunction with

the 3M™Air Ionizer Test Kit 718A (available separately), it can be used for

veriﬁcation and auditing of air ionizers.The Static Sensor 718 is battery-powered

and has several measurement features:

Range: measurements can be taken in a 0-1,990 kV or 19,900 kV range.

Automatic Zero: push button 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 Static Sensor 718 and 3M™Charger

718A use 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 3M™ Static Sensor 718 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

Static Sensor 718 will not produce accurate

results and the battery should be replaced.

2.4 The 3M™ Charger 718A 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 shouldreplace the

battery. Usage of the Charger 718A under low

battery conditions would lead to insufﬁcient

voltage levels being generated.

3.0 Operation of the Static Sensor 718

Supplemental notes:

For accurate measurements during

usage, it is recommended that the

outside housing of the Static Sensor

718 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

Static Sensor 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 3M™Static Sensor 718 is a precision electronic instrument. Improper use

or rough treatment can damage the unit, and render it incapable of providing

accurate measurements.2.2.4 Replace the cover. 2.3 The Static Sensor 718 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 Static Sensor 718

will not produce accurate results and the battery should be replaced.

3.1 Turning the unit ON and OFF: To turn on the Static Sensor 718,

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 Static Sensor 718, 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

high range activated, the static charge on

the object cannot be measured with the

Static Sensor 718.

3.3 Measurement Range: all measurements are in kilovolts (kV) as stated

on the front label of the unit. The Static Sensor 718 has two measurement

ranges: 0-1,990 kV and 0-19,900 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 0-1,990 kV range. Two digits

following the decimal point indicate that the sensor is in 0-19,900 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 Static Sensor 718 may be used.

Simply press the HOLD switch momentarily and the currently displayed

voltage will be frozen. A HOLD notice will also be displayed to alert the

user that the instrument is currently in HOLD status. To unfreeze the display

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™ Static Sensor

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 cm2) area.

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.

3.7 Continuous Output: an output jack is

provided on the front of the 3M™Static

Sensor 718. This output can be used to feed

a continuous signal into a data storage device

for continuous monitoring of measured

voltages. Please use a 3/32 inch (2.5 mm)

mono-phone plug to connect into the output

jack. The output signal is dependent on the

measurement range currently selected. For

the low range, the output signal is 1/1000 of

the measured electrostatic voltage. For the

high range, the output signal is 1/10,000 of

the measured voltage.

3.8 Automatic Shut-Off: the Static Sensor 718 will automatically shut-off

20 minutes after the last switch activity. This is done in order to conserve

battery power. In the event that the user needs to have the unit stay ON

continuously, when turning the unit on press the POWER AND RANGE

switches simultaneously. This deactivates the Automatic Shut-Off

feature. The BAT indicator will then ﬂash three times to indicate that the

automatic shut-off features has been disabled. The Automatic Shut-Off

feature will reset itself the next time the instrument is turned on.

4.0 Operation and Use of the 3M™Air Ionizer Test Kit 718A

It is recommended that the user be familiar with ionizer test standards ANSI/

ESD S3.1 and draft standard ANSI/ESD SP3.3 if the Air Ionizer Test Kit 718A is

used to perform veriﬁcation testing on ionizer performance.

4.1 Assembly: slide the charge plate over the Static Sensor 718 until it stops.

The charge plate slides onto the lower groove,

on the sides of the Static Sensor 718.

4.2 Charging the plate: holding the Static Sensor

718 (with charge plate attached) in one hand,

use the other hand to touch the probe of the

3M™Air Ionizer Test Kit 718A to the charge

plate. Press either the + button (for a positive

voltage) or the – button (for a negative voltage),

then remove the probe from the charge plate.

Be sure to keep the button pressed while

removing the probe from the charge plate.

The display on the Static Sensor 718 will

indicate a positive or negative charging voltage

(1.1kV minimum). If a voltage of less than

±1.1kV is displayed, check to see if the low

battery indicator on the 3M™Charger 718A is

illuminated. If illuminated, replace the battery

in the charger. If the unit continues to supply

an incorrect voltage to the charge plate, please

contact 3M for additional instructions.

4.3 Testing ionizer discharge time: after charging

the plate, hold the 3M™ Static Sensor 718

approximately one foot (30.5 cm) away from the ionizer. Monitor the

display to see how quickly the 1.1 kV charge is dissipated to 0.1 kV. The

speed at which this occurs (the discharge time) indicates how well the

ionizer is operating. Please refer to the speciﬁc ionizer’s operating manual

or consult with the ionizer manufacturer to determine what this discharge

time should be. Repeat this procedure for both a positively and a negatively

charged plate.

4.4 Testing ionizer offset balance: zero

the charge plate by touching it with a

grounded object. This can either be the

ﬁnger of a grounded person or some other

item which is connected to electrical

ground. In either case, zeroing the charge

plate should make the display on the

Static Sensor 718 read zero. Hold the

Static Sensor 718 approximately one foot

(30.5 cm) in front of the ionizer. Monitor the display. The value displayed is

the offset balance of the ionizer, which is the difference between the number

of positive and negative ions being emitted. Please refer to the speciﬁc

ionizer’s operating manual or consult with the ionizer manufacturer to

determine what this offset balance should be.

5.0 Service/Calibration

5.1 Service and Repair: in the event that you believe the Static Sensor 718 or

the 3M™Air Ionizer Test Kit 718A is in need of repair, please contact your

local 3M representative for troubleshooting help, and, as needed, repair

information. There are no user-serviceable parts on either product.

5.2 Calibration: the 3M™Static Sensor 718 and 3M™ Air Ionizer Test Kit

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).

5.3 Equipment Needed:

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

up to 10,000V

Voltmeter, with > 50 kΩinput 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 cm2) 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.

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