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3M CTM051 User Manual

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Type: User Guide
Category: Measuring Instruments
Pages: 17
Size: 0.53 MB

 

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3M

 Ground Pro

Ground Integrity Meter

 

Model CTM051

User’s Guide

 


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1

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.

 


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2

 

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.

 


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3

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

E MI

R ef.

V

P ower

C

O hms

Hold

 


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4

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)

 


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5

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.

 


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6

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

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.

Low-Battery Indication

0

6

2

4

P ower

C

F

%

V

Lin

0

6

2

4

F

 


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7

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 Ohms

X.XXX Ohms

XXXOhms

O hm s

0

6

8

2

4

O hms

0

6

2

4

F

Impedance Screen

0

2

4

 


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8

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.

V

V

0

2

4

V

0

2

4

0

10

6

8

2

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.

 

 


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9

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. 

O hms

R ef

Normal
measurements
screen

0

10

6

8

2

4

Threshold

Impedance
in Ohms

10

6

8

4

REF

 


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10

EMI Measurements

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.

dB

µ V

µ V

dB

0

2

4

AVG

PEAK

EMI

Peak EMI in dBuV

Average EMI in dBuV

Relative peak value

Average EMI in V
Relative peak value

V

Peak EMI in V

V

0

2

4

AVG

PEAK

 


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11

Using Reference with EMI

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 

V

V

0

2

4

AVG

PEAK

V

V

AVG

REF

Ref.

EMI

Normal
measurements
screen

Average

value

Peak value

V

4

AVG

PEAK

4

Hold

V

V

0

2

4

AVG

PEAK

Normal
measurements
screen

V

V

0

2

4

AVG

PEAK

HOLD

V

V

0

2

4

AVG

PEAK

Max. signal values
are shown

Screen is frozen

HOLD MAX

 


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12

Specifications

Impedance

Range

0.001 – 1.999 Ohms 

Automatic auto-zero for test leads

EMI (noise on ground)

Bandwidth

9kHz – 450MHz

Measurement Range

80 dBuV – 140 dBuV 

10 mV – 10 RMS

Measurement Type

Average 

Envelope Peak

Voltage on Ground

AC (50 – 500 Hz)

0.001 – 270 V RMS

DC

0.001 – 400 V

Reference

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.

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.

 


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13

3M

 Ground Pro Ground Integrity 

Meter Model CTM051

Regulatory Information

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 non-
conforming product, within a reasonable time after written notification of said non-
conformance 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 
whatsoever.

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

 


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14

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

部件名称

(Part or Component Name)

有毒有害物质或元素

  

(Hazardous Substances or Elements)

 

(Pb)

 

(Hg)

 

(Cd)

六价铬

(Cr(VI))

多溴

联苯

(PBB)

多溴二

苯醚

(PBDE)

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

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)

×

 


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Please recycle.  Printed in U.S.A.

© 3M 2009.  All rights reserved.

78-9100-6154-4

Electronics Solutions Division

Static Control Products

6801 River Place Blvd.

Austin, TX  78726-9000

866-722-3736

www.3Mstatic.com

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.

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.

部件名称

(Part or Component Name)

有毒有害物质或元素

  

(Hazardous Substances or Elements)

 

(Pb)

 

(Hg)

 

(Cd)

六价铬

(Cr(VI))

多溴

联苯

(PBB)

多溴二

苯醚

(PBDE)

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 

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.