3M 725 Manual de usuario

User’s Guide

3M™Wrist Strap Monitor Model 725

Index

Section Page

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

1 Theory of Operation.................................................................................. 4

2 Operating Your System.............................................................................. 6

3 Installation When Attaching to a Static Control Work Surface................. 7

4 Installation Under Work Bench................................................................. 8

5 Installation Using 3M™ Belt Clip Model 723............................................ 9

6 Parking Clip .............................................................................................. 9

7 Battery Replacement ............................................................................... 10

8 Veriﬁcation Procedure for the 3M™ Wrist Strap Monitor Model 725 ..... 10

9 Speciﬁcations .......................................................................................... 12

10 Parts Included.......................................................................................... 12

11 Required Accessories and Optional Available Parts................................ 13

12 Additional Wrist Strap Monitoring Information ..................................... 14

13 Warranty.................................................................................................. 15

SAFETY INFORMATION

Please read, understand, and follow all safety information contained in this

User’s Guide prior to the use of this 3M™Wrist Strap Monitor Model 725.

Retain these instructions for future reference.

Intended Use:

The 3M Wrist Strap Monitor Model 725 is designed to monitor the operation

of a wrist strap grounding system for a single operator. This product has been

designed and tested for use with 3M™Dual Conductor Wrist Straps and 3M™

Work Surfaces Grounding Systems. This unit is powered by a 9 volt alkaline

battery. Use of other components or use in any other application not evaluated

by 3M may cause improper performance and/or an unsafe condition. To avoid

damage to the 3M Wrist Strap Monitor Model 725, do not use this monitor

outside of the operating conditions listed in this user’s guide.

Explanation of Symbols

CAUTION

Operator(s) Wrist Strap Assembly Ground

Work Surface Ground

Earth; ground

Power input connector polarity (center negative)

Explanation of Signal Word Consequences

WARNING Indicates a potentially hazardous situation which, if not avoided, could

result in death or serious injury and/or property damage.

CAUTION Indicates a potentially hazardous situation which, if not avoided, may

result in minor or moderate injury and/or property damage.

NOTICE Indicates a situation which, if not avoided, could result in property damage.

WARNING

To reduce the risks associated with medical device malfunction which, if not avoided, could result in

serious injury or death:

• Persons with active implanted medical devices (such as heart pacemaker devices) should never

use this monitor.

CAUTION

To reduce the risks associated with environmental contamination which, if not avoided, could result in

minor or moderate injury:

• Dispose of monitor in accordance with all applicable local and government regulations.

NOTICE

To prevent damage to the 3M™Wrist Strap Monitor Model 725:

• Users should not attempt to service this device.

• Do not use in wet or humid environments.

To reduce the risk of damage to components or assemblies being handled:

• Always properly ground your tools and dissipative surfaces to known good ground before

connecting the Wrist Strap Monitor Model 725 for monitoring. If unsure of suitable ground,

contact a licensed electrician before installation.

• Always ensure operator grounding during use of monitor. The Wrist Strap Monitor Model 725

does not provide grounding.

ENVIRONMENTAL CONDITIONS

This equipment has been tested and found to be safe to operate within these environmental conditions.

This is not a warranty of equipment performance within these conditions.

• Indoor use only

• Ingress Protection: IPX0

• Altitude: Up to 2,000 m

• Pollution degree 2.

• Temperature: Maximum 110°F / 43°C Minimum 50°F / 10°C

• Humidity: Maximum relative humidity 80% for temperatures up to 31°C decreasing linearly to

50% relative humidity at 40°C .

Figure 1 – 3MTM Wrist Strap Monitor Model 725 with 3MTM

Dual Conductor Wrist Strap Assemblies.

3MTM Dual Conductor

Metal Wrist Strap*

3MTM

Dual Conductor

Fabric Wrist Strap*

3MTM Wrist Strap

Monitor Model 725

SECTION 1

Theory of Operation

(Refer to Figure 1)

The 3M™Wrist Strap Monitor Model 725 is designed to monitor the operation of

the wrist strap grounding system of a single operator. The system features special

wrist bands and ground cords that contain two independent conductors.*

The

Wrist Strap Monitor Model 725

performs a resistance measurement by

applying an electrical current of less than 1 μA. The path for the current is through

one conductor of the wrist strap ground cord that contains a current-limiting resistor,

through one side of the wrist band, through the skin of the wearer under the band,

through the second side of the wrist band, through the second conductor of the wrist

strap ground cord that contains a current limiting resistor, and ﬁnally back to the

monitor. If the resistance of the wrist strap loop is less than 35 megohms**, the wrist

strap ground cord, wrist band, and the interface of the wrist band to the arm of the

wearer are considered to be functioning correctly. If the measured resistance is over

35 megohms**, a red lamp ﬂashes along with a chirping audible alarm

In addition, the Wrist Strap Monitor Model 725 monitors the ground clip

connection to a predetermined electrical ground. This is accomplished by

measuring the resistance from the monitor, through one conductor of the monitor’s

ground cord and metal clip, through the ground point conducting medium, through

the other metal clip and conductor of the monitor’s ground cord, and ﬁnally back

to the Wrist Strap Monitor Model 725. If the resistance of this loop exceeds 10

megohms***, a red lamp will illuminate with a continuous audible alarm. This

indicates that there is a problem with the monitor’s ground cord or the ground

point connection.

*3M™

Dual Conductor Cord & Wrist Band are required for use with

the 3M™

Wrist Strap Monitor Model 725, ordered separately.

** Resistance values are ±15%

*** Resistance values are +15%, -50%

The

3M™

Wrist Strap Monitor Model 725 requires only a small amount of current to operate.

When the red lamp and the audible alarm are activated simultaneously, the monitor requires

approximately 5 μA of current. When the lamp and alarm are not activated (normal condition),

the monitor requires approximately 50 μA of current.

As with any battery operated electronic device, the life

of the battery will be determined by the frequency of

use. However, for the Wrist Strap Monitor Model 725

you can expect a battery life of approximately one year

in continuous operation under normal conditions.

Note: Use an alkaline battery for longer life.

The Wrist Strap Monitor Model 725 monitors

the battery voltage and alerts the operator when it is necessary to change the

battery. When the battery voltage falls below 6 volts the red lamp will illuminate

with no audible alarm. At this time the Wrist Strap Monitor Model 725 is still

operational, making reliable resistance measurements of the wrist strap assembly

and the ground connection.

Voltage on Operator when Connected to the 3M Wrist Strap Monitor

Model 725

There is a concern about the voltage that is applied to an operator while they are connected

to a monitor. Some of today’s electronic components are extremely sensitive to electrostatic

discharge from a person (less than 10 volts). The following chart for the Wrist Strap Monitor

Model 725 illustrates the level of voltage that will appear on the operator under various

resistance conditions.

Voltage on Operator when connected to the Wrist Strap Monitor Model 725

Condition Observed Voltage

No Skin Resistance 0.8V

200K Ohm Skin Resistance 0.9V

Likely Case Before Alarm 3.5V

Worst Case Before Alarm 6.8V

Absolute Worst Case 9.0V

NOTICE

The 3M™Wrist Strap Monitor

Model 725 does not have the

capability of verifying that the

ground point is a suitable ground.

If you are not sure what a suitable

ground is, contact a licensed

electrician before installation.

Note: For more information about wrist strap monitoring see Additional Wrist Strap Monitoring

Information (Section 12).

SECTION 2

Operating Your System

To operate the 3M™Wrist Strap Monitor Model 725, attach the monitor’s (6 ft.)

ground cord with dual conductor ground clip to a suitable ground.

Attach a 3M™Dual Conductor Ground

Cord to a 3M™Dual Conductor Wrist

Band. Place the wrist band on your

wrist and plug the cord into the jack

on the front of the Wrist Strap Monitor

Model 725. Plugging into the jack

activates the monitor and causes it to

emit a short beep and the red lamp

to momentarily ﬂash. If the red lamp

ﬂashes with an intermittent audible

alarm or at any time during use, the

resistance of the wrist strap assembly

is greater than 35 megohms.** If

the red lamp and the audible alarm

remain on continuously, check the dual

conductor ground clip connection.

The system is now ready for use.

**Resistance values are ±15%

Note: Operators may complain that the alarm

is sounding too often until they learn to

adjust the wrist band to ﬁt securely or apply

an approved skin moisturizer on a frequent

basis. Please remember that the monitor is

informing you that the operator is exceeding

the established static control requirement for

resistance to ground when wearing a static

protective wrist strap assembly. These alarms

alert the operator when sensitive electronics

are possibly being exposed to static electricity.

Prior to incorporating the wrist strap monitor

into your static control process, the operator

could be unaware of these events.

Figure 2

NOTICE

If you decide not to use the dual

conductor ground clip that is attached

to the monitor’s ground cord in the

way described in this user instruction

manual, observe the following

precaution: Attach each of the two wires

of the monitor’s ground cord to separate

ground bonding points. By attaching the

wires to the same ground but at different

physical locations, the monitor can

check for loose or lost connections.

SECTION 3

Installation When Attaching to a Static Control Work Surface

The 3M™Wrist Strap Monitor Model 725 can be used to ground a work surface

while providing a monitored grounding point for an operator. To ground a

work surface, the Wrist Strap Monitor

Model 725 contains a snap located

on its bottom cover, that is connected

internally to the monitor’s ground cord.

To use this feature there must be a 3M™

Female Snap Fastener Model 3034,

10 mm, snap fastener attached to the

grounding layer of the work surface.

Simply align the male snap on the

monitor with the female snap on the

work surface and press downward on

the monitor. The work surface is now

automatically grounded through a one

megohm resistor by the Wrist Strap

Monitor Model 725.

3M™Work Surface 8200 Series use the female 10 mm (3M Female Snap

Fastener Model 3050) snap fastener for grounding. 3M™ Work Surfaces 1800,

8300 and 8800 Series use the female 10 mm (3M Female Snap Fastener Model

3034) snap fastener for grounding. In addition all 3M™Portable Field Service

Kits 8500 Series include the 10 mm (Female Snap Fastener Model 3034) snap

fastener.

Use of an optional 3M™Stand-By Jack 3057 at the work station extends the life

of the monitor’s input jack. The user disconnects the wrist strap ground cord

from the wrist band and plugs into the Stand-By Jack 3057 which is mounted at

the work station. Plugging into the Stand-By Jack 3057 prevents the Wrist Strap

Monitor Model 725 from continuously alarming when disconnected from the

wrist band.

The system is now ready for use.

Note: Although the work surface is grounded by

the 3M™Wrist Strap Monitor Model 725, it is

not monitoring the ground to the work surface.

Figure 3

SECTION 4

Installation Under Work Bench

The 3M™Wrist Strap Monitor Model

725 can be mounted under a work bench

by securing with two #8 screws (not

supplied) through the mounting hole

tabs located on the top cover.

When mounting the Wrist Strap Monitor

Model 725 under a work bench for non

mobile use, remove the parking clip

(Section 6) from the Wrist Strap Monitor

Model 725 using a small screwdriver.

The Wrist Strap Monitor Model 725 is

now ready to mount.

Position the monitor so that it is

convenient for the operator to plug

their wrist strap ground cord into the

jack on the front of the monitor. It is

recommended that the front face of the monitor be ﬂush or slightly recessed

from the front edge of the work bench. Attach the monitor to the work bench

with the screws. It may be necessary to pre-drill pilot holes for the screws.

Attach the dual conductor ground clip or each wire of the monitor’s dual

conductor ground cord to a suitable ground.

Use of an optional 3M™Stand-By Jack 3057 at the work station extends the life

of the monitor’s input jack. The user disconnects the wrist strap ground cord

from the wrist band and plugs into the Stand-By Jack 3057 which is mounted at

the work station. Plugging into the Stand-By Jack 3057 prevents the Wrist Strap

Monitor Model 725 from continuously alarming when disconnected from the

wrist band.

The system is now ready for use.

Note: Use of the monitor in this way precludes

grounding a work surface through the snap

connector on the bottom of the monitor. A static

control work surface, if present, would require

grounding separately through an additional

ground cord.

Figure 4

SECTION 5

Installation Using 3M

™

Belt Clip 723 (Optional)

An optional belt clip is available to further enhance the portability feature of

the 3M™Wrist Strap Monitor Model 725. This expands the use of the monitor

when operators need to be highly mobile as in an electronic manufacturing

environment. Simply attach the belt clip with female snap connector to the

male snap connector on the monitor bottom cover. Slide the clip over your

belt in a convenient place, so that the wrist strap ground cord will not interfere

with normal body movements when attached to the monitor. Attach the dual

conductor ground clip to a suitable ground at the work location. During mobility,

attach the dual conductor ground clip to the parking clip on the Wrist Strap

Monitor Model 725 (See Section 6).

SECTION 6

Parking Clip

A parking clip is supplied

with the Wrist Strap Monitor

Model 725 allowing mobile

users to silence the ground clip

disconnect alarm. Attaching the

dual conductor ground clip to the

parking clip prevents unnecessary

disconnecting/connecting of the

wrist strap ground cord from the

input jack during mobility. An

added beneﬁt of this feature is that

it extends the life of the dual conductor ground cord plug and the monitor’s input

jack. The parking clip is already attached to the mounting tab of the Wrist Strap

Monitor Model 725. If the Wrist Strap Monitor Model 725 is to be mounted

under a work bench for permanent use, remove the parking clip from the Wrist

Strap Monitor Model 725 using a small screwdriver.

Figure 5

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