3M CTM051 User Guide

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:



CAUTION:



NOTICE:

Indicates a potentially hazardous situation, which, if not avoided, could result in
death or serious injury and/or property damage.

Indicates a potentially hazardous situation, which, if not avoided, may result in
minor or moderate injury and/or property damage.

Indicates a potentially hazardous situation, which, if not avoided, may result in
property damage.

1

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.

2

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

EMI

Ref.

V

P o wer

C

Ohms

Hold

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

3

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.

Banana Jacks

Keypad

Display

Battery Compartment

(on the back)

4

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.

5

Low-Battery Indicator

0 62 4

P o wer

C

F

%

V

Lin

0 62 4

F

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.

Low-Battery Indication

Turning Unit On and Off

ON

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.

6

Impedance Measurements

X.XX O hm s XX.X O hm sX.XXX Ohm s XXXOhm s

O hms

0 6 82 4

Ohms

0 62 4

F

0 2 4

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.

Impedance Screen

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.

7

V

V

0 2 4

V

0 2 4

0 106 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.

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.

8

Using Reference with Voltage

Ohms

Ref

Normal
measurements
screen

0 106824

Threshold

Impedance
in Ohms

10684

REF

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.

9

EMI Measurements

dB

µ V

µ V

dB

0 24

AVG PEAK

EMI

Peak EMI in dBuV

Average EMI in dBu

V

Relative peak value

Average EMI in V

Relative peak value

V

Peak EMI in V

V

0 24

AVG PEAK

High frequency noise (EMI) on a ground causes equipment malfunction and

damage to sensitive components. The 3M™ Ground Pro Ground Integrity

Meter measures

high-frequency noise

on a ground in a

wide frequency and

dynamic range.

High-frequency

noise is measured

in two different

units — volts and

dBuV. The latter is a

logarithmic measure

of voltage where 0dB

is referenced to 1uV.

In order to measure

EMI on a ground, press the EMI button. The screen will show the average

value of the high-frequency signal in Volts on the top display line and the

magnitude of the envelope peak of the signal (i.e. transients or spikes) on

the bottom line. By pressing the EMI button one more time you can switch

to dBuV units, as shown above.

Autoscale

The Ground Pro uses autoscaling in EMI mode — no scale switching is

necessary.

10

Using Reference with EMI

V

V

0 24

AVG PEAK

V

V

AVGREF

Ref.

EMI

Normal
measurements
screen

Average
value

Peak value

V

4

AVG PEAK

4

Hold

V

V

0 24

AVG PEAK

Normal
measurements
screen

V

V

0 24

AVG PEAKHOLD

V

V

0 24

AVG PEAK

Max. signal values
are shown

Screen is frozen

HOLD

MAX

Reference mode is helpful if you wish to

hear an audio alarm whenever the EMI

signal exceeds a certain level. In order to

use this mode, depress the REF button while

in any of the EMI screens. You should see

the REF indicator at the top of the display.

The bottom line of the display will now

show the reference value of the average

signal instead of the peak value of the signal.

Adjust the reference level using the Up and

Down arrow buttons. Now whenever the

average value of the EMI signal exceeds this

reference level, an audio alarm will sound.

By depressing the REF button again, you

can adjust the reference level for the peak

signal as shown on the right.

Hold Function

Pressing the Hold button once while in any

measurement mode will cause the 3M™

Ground Pro Ground Integrity Meter to enter

the Hold mode. The display will freeze,

showing the value at the moment the button

was pressed. Pressing the Hold button

a second time the display will show the

maximum value of the signal accumulated

from the moment of pressing the button.

Please note that if you power down the

Ground Pro while in any of these modes,

it will collect the maximum value of the

measured parameter for as long as this mode

11

is active. Please note that if you power down the 3M™ Ground Pro Ground Integrity

Meter while in any of these modes, it will remain in the same mode when the unit is

powered up again.

Pressing the Hold button one more time puts the Ground Pro back into regular mode.

Specifications

Impedance

Range 0.001 – 1.999 Ohms

EMI (noise on ground)

Bandwidth 9kHz – 450MHz

Measurement Range 80 dBuV – 140 dBuV

Measurement Type Average

Voltage on Ground

AC (50 – 500 Hz) 0.001 – 270 V RMS

DC 0.001 – 400 V

Reference

Automatic auto-zero for test leads

10 mV – 10 RMS

Envelope Peak

Individual reference setting for each parameter

Hold

Hold, Hold Max

General

Power Battery 9V Alkaline

Dimensions (approx.) 4.5” x 3.6” x 1.1”

114 mm x 92 mm x 28 mm

All specifications are subject to change without notice.

12

3M™ Ground Pro Ground Integrity
Meter Model CTM051

Regulatory Information

China RoHS

Electronic Industry Standard of the People’s Republic of China, SJ/T11363-2006,

Requirements for Concentration Limits for Certain Hazardous Substances in

Electronic Information Products

This symbol, per Marking for the Control of Pollution Caused by
Electronic Information Products, SJ/T11364-2006, means that
the product or part does contain a substance, as detailed in the
chart below, in excess of the following maximum concentration
values in any homogeneous material: (a) 0.1% (by weight) for
lead, mercury, hexavalent chromium, polybrominated biphenyls
or polybrominated diphenyl ethers; or (b) 0.01% (by weight)
for cadmium. Unless otherwise stated by 3M in writing, this
information represents 3M’s best knowledge and belief based
upon information provided by third party suppliers to 3M.

This numerical reference should not be construed as a representation regarding the
product’s life or an extension of a product warranty. In the event any product is proven
not to conform with 3M’s Regulatory Information Sheet, then 3M’s entire liability and
buyer’s exclusive remedy, will be at 3M’s option either: (i) replacement of product with
a conforming product, or (ii) refund of the purchase price paid by buyer for each non­conforming product, within a reasonable time after written notification of said non­conformance and return of said product to 3M. 3M shall not under any circumstances be
liable for direct, incidental, special, or consequential damages (including but not limited to
loss of profits, revenue, or business) related to or arising out of this certification, including,
the use, misuse or inability to use the product. Unless stated otherwise in writing,
the foregoing language cannot be waived, modified, or supplemented in any manner
wh ats oever.

13

产品中有毒有害物质或元素的名称及含 量

Name and Content of Hazardous Substances or Elements

有毒有害物质或元素

部件名称

(Part or Component Name)

电容引脚

(Termination in capacitor)

电位器中的电阻油墨

(Resistor ink in potentiometer)

二极管焊 接部

(Solder in diode)

二极管电镀

(Finish in diode)

印刷电路板 焊盘 /安

铅

(Pb）汞 （Hg）镉 （Cd）

×

×

×

×

×

(Hazardous Substances or Elements)

○ ○ ○ ○ ○

○ ○ ○ ○ ○

○ ○ ○ ○ ○

○ ○ ○ ○ ○

○ ○ ○ ○ ○

装孔

(Terminations in PCBs )

○ ○ ○ ○ ○

电阻引脚

(Terminations in resistors)

电阻电镀部

(Plating in resistors)

连接器

(Connector)

三极管

(Transistor)

电感器

(Inductor)

电磁干扰滤波器

(EMI filter)

装置的焊接部

(Solder in instrument)

IC焊接部

(Solder in IC)

×

○ ○ ○ ○ ○

×

○ ○ ○ ○ ○

×

○ ○ ○ ○ ○

×

○ ○ ○ ○ ○

×

○ ○ ○ ○ ○

×

○ ○ ○ ○ ○

×

○ ○ ○ ○ ○

×

六价铬

（Cr(VI)）

多溴

联苯

（PBB）

多溴二

苯醚

（PBDE）

14

有毒有害物质或元素

部件名称

(Part or Component Name)

蜂鸣器焊接部

(Solder in buzzer)

音频插孔

(Audio jack)

“○：表示该有毒有害物质在该部件所有均质材料中的含量均在SJ/T11363-2006 标

准规定的限量要求以下。(Indicates that this hazardous substance contained in all of the homogeneous

materials for this part is below the limit requirement in SJ /T11363-2006.)

×：表示该有毒有害物质至少在该部件的某一均质材料中的含量超出SJ/T11363-
2006 标准规定的限量要求。(Indicates that this hazardous substance contained in at least one of the

homogeneous materials used for this part is above the limit requirement in SJ/T11363-2006.)”

3M is a trademark of 3M Company.

Important Notice

All statements, technical information, and recommendations related to 3M’s products are based on information
believed to be reliable, but the accuracy or completeness is not guaranteed. Before using this product, you must
evaluate it and determine if it is suitable for your intended application. You assume all risks and liability associated
with such use. Any statements related to the product which are not contained in 3M’s current publications, or any
contrary statements contained on your purchase order shall have no force or effect unless expressly agreed upon,
in writing, by an authorized officer of 3M.

铅

(Pb）汞 （Hg）镉 （Cd）

×

×

(Hazardous Substances or Elements)

六价铬

（Cr(VI)）

多溴

联苯

（PBB）

多溴二

苯醚

（PBDE）

○ ○ ○ ○ ○

○ ○ ○ ○ ○

Warranty; Limited Remedy; Limited Liability.

This product will be free from defects in material and manufacture for a period of one (1) year from the time of
purchase. 3M MAKES NO OTHER WARRANTIES INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY

OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

If this product is defective within the warranty period stated above, your exclusive remedy shall be, at 3M’s option,
to replace or repair the 3M product or refund the purchase price of the 3M product. Except where prohibited by

law, 3M will not be liable for any indirect, special, incidental or consequential loss or damage arising from
this 3M product, regardless of the legal theory asserted.

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Static Control Products

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