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Ground Man
Ground Monitors for Tools
Protect your sensitive boards from overvoltage
and electrostatic discharge
Grounding is the most fundamental element of ESD management in manufacturing and in
service. A broken ground connection may result in personnel exposure to dangerous voltage,
equipment lockup or malfunction and damage to sensitive components.
3M™ Ground Man Monitors offer continuous monitoring of proper ground connection of up to
3 points in the tools. With individual status indication, Ground Man Monitors show which
ground connection is being monitored, which one is within specification and which one has
failed. Patented enabling feature for each ground connection allows for accurate and safe
indication of ground condition for each monitored point.
Miniature and inobtrusive, the Ground Man Monitors are easy to install and easy to connect.
Groud impedance alarm levels can be set by the user to satisfy a broad range of requirements
and compliance with such standards as ANSI 6.1 and ANSI/ESDA S.20.20. Examples of
applications for Ground Man Monitors include SMT pick-and-place tools, IC handlers, wire
bonders, die attach and other tools.
In order to further improve reliability of ground connections, Ground Man Monitors provide
logic level signal to the host tool -- this way the tool can be shut down in case of ground failure.
The 3M™ Ground Man Plus Monitor adds wrist strap monitoring to assure that only properly
grounded operators work with the sensitive devices. The operator is monitored for proper
connectivity and for excessive body voltage.
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Applications
Electronics Assembly
Semiconductor Device Manufacturing
Medical Environment
Military
Aerospace
Wherever sensitive components are
being handled
Key Advantages
ANSI/ESDA S.20.20
Compliant
Ground Man monitors measure ground
impedance in accordance with requirements
of ANSI/ESDA S.20.20 standard.
Ground Man
CTC333
Ground Man Plus
CTC334
Adjustable Alarm Threshold
The alarm threshold can easily be adjusted at
any time in a range of 1 to 20 Ohms.
Ground Monitors for Tools
Features
Ground impedance monitoring
Adjustable impedance alarm level
Enable/Disable for each ground
Output to the host tool
Operator wrist strap monitoring
Operator body voltage monitoring
Patented replaceable wriststrap jack
Audio and visual alarms
Sound alarm on/off
Output to the Tool
Ground Man Monitors provide logic signal to
the tool to shut it down when any of the
grounds fail.
Complete Tool Coverage
The Ground Man Plus Monitors provide
complete grounding coverage of a tool. With
the Ground Man Plus Monitors, you would
cover all important ground connections in the
tool and an operator.
3M™ Down to Earth Family
Ground Man and Ground Man Plus Monitors
are members of the new 3M™ Down to Earth
Monitor family -- a practical and cost-effective
solution to ESD and EOS in electronics
assembly.
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Specification
Is Your Tool Grounded?
Most of the tools are comprised of many parts
which are not always connected together. Good
mechanical contact does not automatically
assure proper electrical contact. Sometimes
anodized metal surfaces make them essentially
an insulator. Moving parts are often grounded
via ball bearings which makes good contact
only when stopped -- otherwise the contact is
highly intermittent. It is very important to test
proper grounding not only of the tool’s frame,
but also of all conductive parts of the tool - not
only when the tool stops, but during the tool’s
motions.
3M™ Ground Man monitors offer a reliable and
easy-to-use means of continuous assurance of
proper grounding of key elements of the tools.
Pa r a m e t e r
Overvoltage
Alarm
1 ... 20 Ohms
3
1 ... 20 Ohms
3
Ground Man
Ground Man Plus
Ground impedance range
Number of monitored
grounds
Ground Enable
Operator Grounding
Wrist strap
Operator’s resistance alarm
Operator body voltage alarm
Yes, each individual ground Yes, each individual ground
Dual, 3.5mm plug
Yes
Yes
© 3M 2007. All rights reserved. 3M is a trademark of 3M Compaqny. U.S. Patents 6,930,612, 7,118,380, other patents pending.
QFA03105 Please recycle
Alarm
Visual
Audio
LED
Buzzer
LED
Buzzer
Interface
Output on Ground Failure
Logic Level
Any ground failure
Loic Level
Any ground or wrist strap
failure
General
Power
Dimensions
Production tools typically have many separate parts
that need to be grounded
External adapter
0.85”H x 2.4”W x 2.5”L
22 mm x 61mm x 63mm
External adapter
0.85”H x 2.4”W x 2.5”L
22 mm x 61mm x 63mm
Importance of Grounding
Grounding is the most important component of ESD protection
One of the best returns on investments in ESD improvements is
always in improving and maintaining proper grounding for all
equipment and all parts of the equipment.
Good grounding assures that all conductive parts of the tool
have the same potential and do not introduce electric over-
stress and electrostatic discharges during the tool’s operation.
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.
Ground Man monitors provide accurate monitoring of ground-
ing even in the presence of noise where a typical multimeter fails.
ESD or not, the first and foremost importance of grounding is
safety. Properly grounded tools will not expose an operator to
dangerous high voltage in case of tool malfunction or problems
with wiring. Only continuous monitoring can provide assurance
of proper grounding.
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
PURPOSE.
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.
Ordering
Information
Accessories
Ground Man and Ground Man Plus
are shipped with:
Power adaptor
User’s Guide
Please contact factory for other options and
accessories.
CTC-33X-Y
Ground Man
Ground Man Plus
Universal Power Adapter
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2370
CTA251
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WW
Dual Conductor Fabric Wrist Band
Dual Conductor Coiled Ground Cord, 10 ft.
Replacement Terminal Board w/Jack
3601-A Caldwell Dr.
Soquel, CA 95073 U.S.A.
Tel. 831-459-7488
www.credencetech.com
www.3M.com/electronics
info@credencetech.com
All specifications are subject to change without notice.
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