3M CTM051 Manuale utente

3M™Ground Pro

Ground Integrity Meter

Model CTM051

User’s Guide

3M™Ground Pro Ground Integrity Meter

Model CTM051

Safety Information

Read, understand, and follow all safety information contained in these user

instructions prior to use of the 3M Ground Pro Ground Integrity Meter Model

CTM051. Retain these user instructions for future reference.

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 potentially hazardous situation, which, if not avoided, may result in

property damage.

 WARNING

To reduce the risks associated with environmental contamination:

When working with the automated equipment, always observe safety precautions as•

recommended by equipment manufacturer and your company’s practices

 CAUTION

To reduce the risks associated with environmental contamination:

Dispose of the monitor in accordance with local, state, and federal regulations•

NOTICE

To reduce the risks associated with property damage:

Periodically check that the indicator is functioning properly•

FCC

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two

conditions: (1) this device may not cause harmful interference, and (2) this device must accept any

interference received, including interference that may cause undesired operation.

Note: This equipment has been tested and found to comply with the limits for a Class A digital device,

pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection

against harmful interference when the equipment is operated in a commercial environment. This

equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in

accordance with the instruction manual, may cause harmful interference to radio communications.

Operation of this equipment in a residential area is likely to cause harmful interference in which case

the user will be required to correct the interference at his own expense.

Industry Canada

This Class A digital apparatus complies with Canadian ICES-003.

The 3M™Ground Pro Ground Integrity Meter is a comprehensive instrument that

measures the ground connection of your equipment in accordance with ANSI 6.1 and

ANSI/ESDA S.20.20 standards. In addition to measuring ground impedance, it also

measures AC and DC voltage on the ground as well as the presence of high-frequency

noise or electromagnetic interference (EMI) on the ground, alerting you to possible

functionality problems, such as tool lockups, erratic behavior and parametric errors.

Controls and Indicators

Turns the power on and off. Hold for a few seconds to turn the unit off. Also

resets some parameters.

Switches the unit into impedance measurement mode.

Switches the unit into high-frequency noise (EMI) measurement mode.

Switches the unit into AC and DC voltage measurement mode.

Sets up the reference for measurements and alarms.

Freezes the display/and shows the maximum measured value.

Adjusts the scale for some parameters and adjusts reference values.

Display backlight on/off

EMI

Ref.

P owe r

Ohms

Hold

Brief Tour of your 3M™Ground Pro

Ground Integrity Meter

Please refer to the rest of this User’s Guide for detailed explanations of each control,

indicator and connection.

Display

Banana Jacks

Keypad

Battery Compartment

(on the back)

Overview

The 3M™Ground Pro™Ground Integrity Meter measures several important

parameters of ground integrity: ground impedance, voltage, and high-frequency noise

(EMI) on a ground.

Ground connectivity is measured in accordance with ANSI 6.1, ANSI/ESDA S.20.20

and other standards. More speciﬁcally, it is measured as AC impedance in a way that

is immune to parasitic voltages and currents on a ground.

In addition to monitoring the ground connection, the Ground Pro measures high-

frequency voltage (EMI) on the ground that is often present in a factory environment.

Such interference causes problems with the operation of equipment.

The Ground Pro also measures AC and DC voltage on the ground in case of

miswiring.

General

Power

Ground Pro uses a 9V alkaline battery. Do not use any other battery. If you are not

using your Ground Pro for an extended period of time, remove the battery from the

unit in order to prevent damage caused by a possible battery leakage.

Note: Not all batteries labeled similarly have the same performance. Often an off-

brand alkaline battery has only 50% to 60% of the capacity of the leading brand-name

battery.

Installing the Battery

Slide off the battery door at the back of the Ground Pro and attach the 9V battery to

the battery clips. Observe the polarity of the battery. Re-install the battery door.

Low-Battery Indicator

When battery voltage gets low (less than 20% capacity

remains), the low battery indicator on the display

appears. At this point it is a good idea to install a new

battery to assure optimal performance.

Turning Unit On and Off

Press the Power/C button. The battery voltage will be displayed for a

moment in both volts and percentage of the full capacity. If the battery voltage is too

low even to indicate low-voltage status on the display or if the self-diagnostic fails, you

will hear a beep and the unit will shut itself off. If the battery is completely “dead,”

there may not even be a beep. Please replace the battery.

OFF

Press the Power/C button for at least two seconds. The 3M™Ground Pro

Ground Integrity Meter will turn off.

Automatic Power Off

In order to save battery life, the Ground Pro has an

automatic power-off (APO) feature that will turn off the

Ground Pro off after approximately 10 minutes if no

buttons are pressed. You can disable or enable APO by

depressing the F button several times until you get to the screen shown to the right.

You can then enable or disable APO using the Up and Down arrow buttons. Please

keep in mind that with APO disabled, the battery life will be shorter.

Checking the Battery Voltage

Press the F button several times until you get to the

following screen. The upper display shows the battery

voltage, and the lower display shows the percentage of

usable battery life left.

Low-Battery Indication

0 62 4

P owe r

Lin

0 62 4

Impedance Measurements

Depress the Ohms button to go into ground impedance

mode. You should see a screen similar to the one

shown on the right. The impedance mode is indicated

by “OH” on the bottom display line.

Scaling

The 3M™Ground Pro Ground Integrity Meter has

four different scales for measuring ground impedance. Choose the appropriate scale

for your measurements using the Up and Down arrow buttons.

Auto-Zeroing Test Leads

Test leads offer added impedance and may alter

measurement results, especially at a lower scale. In

order to take impedance of test leads into account,

short the ends of the test leads together and depress the

Function button (F) until you see the screen shown on

the right. In a few seconds, this screen will disappear

and you will hear a short beep. The Ground Pro will

return to normal measurement mode. Now when the

test leads are shorted together, the display should show

zero Ohms, even though the test leads may have some

impedance. The correction factor will be saved in non-

volatile memory.

X.XX Ohms XX.X OhmsX.XXX Ohms XXXOhms

O hms

0 6 82 4

Ohms

0 62 4

Impedance Screen

0 2 4

Voltage Measurements

The presence of voltage on a ground is never desirable.

The 3M™Ground Pro Ground Integrity Meter can measure

both AC and DC voltages on a ground.

AC Voltage

Press the V button once. The Ground Pro

will switch to AC voltage measurement

mode and you should see a screen similar

to one on the right. You can adjust the

measurement scale using the Up and Down

arrow buttons.

DC Voltage

Press the V button again to switch to DC

voltage measurement mode. You should see a

screen similar to the one on the right. As in AC

mode, you can adjust the measurement scale

using the Up and Down arrow buttons.

Overload

If voltage on the ground is above the maximum

level on a particular scale, you should see an

overload indicator such as the one on the right.

In such a case, go to the next scale using the Up

arrow button.

0 2 4

0106 82 4

If the test leads are not shorted properly or become accidentally disconnected

during this process, auto-zero will fail and you should hear a long beep before the

display returns to the impedance measurement screen. In this case you will need

to repeat this process again.

Using Reference with Voltage

Measurements

Using Reference with

Impedance Measurements

The Reference function

helps to set limits at which

an audio alarm sounds to

indicate that the measured

impedance is below the

speciﬁed limit. Unlike a

regular multimeter, the 3M™

Ground Pro Ground Integrity

Meter allows you to specify

an exact impedance value

at which the instrument will

provide an audio indication.

In Impedance mode, depress

the Ref. button. You should

see a screen similar to the

one on the right with the REF indicator on. The top line of the display

shows the current impedance value (in this example it is an open circuit)

and the bottom line shows the reference level. Adjust the reference level by

using the Up and Down arrow buttons. Now when the impedance is below

the reference value, you should hear a beep. The reference value is set for

a particular range - you may need to readjust it for a different range. The

reference value will be saved in the internal non-volatile memory.

Ohms

Ref

Normal

measurements

screen

0106824

Threshold

Impedance

in Ohms

10684

REF

Indice

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