Newport New Focus Picomotor 8742 User manual

Picomotor™ Controller/Driver
User’s Manual
Model 8742

ii Preface
EU27 DECLARATION OF CONFORMITY
Application of Council Directive(s):
☒Electromagnetic Compatibility Directive (EMCD) – 2014/30/EU
☒Low Voltage Directive (LVD) – 2014/35/EU
☒Restriction of Hazardous Substances Directive (RoHS2) – 2011/65/EU (2)
☒Restriction of Hazardous Substances Directive (RoHS3) – (EU) 2015/863 (2)
☒Waste Electrical and Electronic Equipment – Directive 2012/19/EU
Standard(s) to which conformity is declared:
☒EN 61326-1:2013 – (EMC)
☒EN 61010-1:2010 + AMD 1:2016 (Ed 3) – (Safety)
Emissions:
☒CISPR 11:2015 Industrial, Scientific and Medical Equipment Radio-Frequency Disturbance Characteristics -
Limits and Methods of Measurement
☒IEC 61000-3-2:2018 EMC/Limits for Harmonic Current Emission (1)
☒IEC 61000-3-3:2013 + AMD1:2017 EMC/Limitations of Voltage Fluctuations and Flicker in Low-Voltage
Supply Systems (1)
Immunity:
☒IEC 61000-4-2:2008 EMC/Electrostatic Discharge Immunity Test
☒IEC 61000-4-3:2006+AMD1:2007+AMD2:2010 EMC/Radiated Radio - Frequency Electromagnetic Field
Immunity Test
☒IEC 61000-4-4:2012 EMC/Electrical Fast Transient/Burst Immunity Test
☒IEC 61000-4-5:2014 + AMD 1:2017 EMC/Surge Immunity Test (1)
☒IEC 61000-4-6:2013 EMC/Conducted Disturbances induced by Radio Frequency Fields Immunity Test
☒IEC 61000-4-8:2009 EMC/Power Frequency Magnetic Field Immunity Test
☒IEC 61000-4-11:2004 + AMD 1:2017 EMC/Voltage Dips, Short Interruptions and Variations Immunity Test (1)
Manufacturers Name: MKS Instruments, Inc., 2 Tech Drive, Andover, MA 01810 USA
Authorized Representatives Name & Location: MICRO-CONTROLE Spectra-Physics S.A.S., Zone
Industrielle, 45340 Beaune la Rolande, France
Equipment Type/Description: Electrical equipment for measurement, control and laboratory use
Model Number(s) (1): 8742, 8742-Various
The object of the declaration described above is in conformity with the relevant Community harmonization
legislation. MKS product conforms to the above Directive(s) and Standard(s) only when installed in accordance with
manufacturer’s specifications. This declaration has been issued under the sole responsibility of the manufacturer.
Date: 1/5/2021 Signature:
Full Name: Le Cointe Hervé
Title: Quality director
==========================================================================================================================================
1) Compliance of the above model numbers requires the use of a braided shielded cable properly terminated at both ends – if so noted in the
MKS Instruction Manual.
2) RoHS Directive has to be checked for in scope products; cannot CE mark without compliance to RoHS. RoHS Directive can be
unchecked only for systems which MKS sells which qualify for “Large Scale Industrial Tool” exclusion.

Preface iii
UK DECLARATION OF CONFORMITY
Application of Council Directive(s):
☒Electromagnetic Compatibility Directive (EMCD) – 2014/30/EU
☒Low Voltage Directive (LVD) – 2014/35/EU
☒Restriction of Hazardous Substances Directive (RoHS2) – 2011/65/EU (2)
☒Restriction of Hazardous Substances Directive (RoHS3) – (EU) 2015/863 (2)
☒Waste Electrical and Electronic Equipment – Directive 2012/19/EU
Standard(s) to which conformity is declared:
☒BS EN 61326-1:2013 – (EMC)
☒BS EN 61010-1:2010 + AMD 1:2016 (Ed 3) – (Safety)
Emissions:
☒CISPR 11:2015 Industrial, Scientific and Medical Equipment Radio-Frequency Disturbance Characteristics -
Limits and Methods of Measurement
☒IEC 61000-3-2:2018 EMC/Limits for Harmonic Current Emission (1)
☒IEC 61000-3-3:2013 + AMD1:2017 EMC/Limitations of Voltage Fluctuations and Flicker in Low-Voltage
Supply Systems (1)
Immunity:
☒IEC 61000-4-2:2008 EMC/Electrostatic Discharge Immunity Test
☒IEC 61000-4-3:2006+AMD1:2007+AMD2:2010 EMC/Radiated Radio - Frequency Electromagnetic Field
Immunity Test
☒IEC 61000-4-4:2012 EMC/Electrical Fast Transient/Burst Immunity Test
☒IEC 61000-4-5:2014 + AMD 1:2017 EMC/Surge Immunity Test (1)
☒IEC 61000-4-6:2013 EMC/Conducted Disturbances induced by Radio Frequency Fields Immunity Test
☒IEC 61000-4-8:2009 EMC/Power Frequency Magnetic Field Immunity Test
☒IEC 61000-4-11:2004 + AMD 1:2017 EMC/Voltage Dips, Short Interruptions and Variations Immunity Test (1)
Manufacturers Name: MKS Instruments, Inc., 2 Tech Drive, Andover, MA 01810 USA
Authorized Representatives Name & Location: MICRO-CONTROLE Spectra-Physics S.A.S., Zone
Industrielle, 45340 Beaune la Rolande, France
Equipment Type/Description: Electrical equipment for measurement, control and laboratory use
Model Number(s) (1): 8742, 8742-Various
The object of the declaration described above is in conformity with the relevant Community harmonization
legislation. MKS product conforms to the above Directive(s) and Standard(s) only when installed in accordance with
manufacturer’s specifications. This declaration has been issued under the sole responsibility of the manufacturer.
Date: 1/5/2021 Signature:
Full Name: Le Cointe Hervé
Title: Quality director
==========================================================================================================================================
1) Compliance of the above model numbers requires the use of a braided shielded cable properly terminated at both ends – if so noted in the
MKS Instruction Manual.
2) RoHS Directive has to be checked for in scope products; cannot UKCA mark without compliance to RoHS. RoHS Directive can
be unchecked only for systems which MKS sells which qualify for “Large Scale Industrial Tool” exclusion.

iv Preface
Warranty
New Focus warrants that this product will be free from defects in material and
workmanship and will comply with New Focus’s published specifications at the
time of sale for a period of one year from date of shipment. If found to be defective
during the warranty period, the product will either be repaired or replaced at New
Focus's option.
To exercise this warranty, write or call your local New Focus office or
representative, or contact Newport headquarters in Irvine, California. You will be
given prompt assistance and return instructions. Send the product, freight prepaid,
to the indicated service facility. Repairs will be made and the instrument returned
freight prepaid. Repaired products are warranted for the remainder of the original
warranty period or 90 days, whichever first occurs.
Limitation of Warranty
The above warranties do not apply to products which have been repaired or modified
without New Focus’s written approval, or products subjected to unusual physical,
thermal or electrical stress, improper installation, misuse, abuse, accident or
negligence in use, storage, transportation or handling. This warranty also does not
apply to fuses, batteries, or damage from battery leakage.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED
OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. NEW FOCUS
SHALL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, OR
CONSEQUENTIAL DAMAGES RESULTING FROM THE PURCHASE OR USE
OF ITS PRODUCTS.
First printing 2017
© 2017 by New Focus, Santa Clara, CA. All rights reserved. No part of this manual
may be reproduced or copied without the prior written approval of New Focus.
This manual has been provided for information only and product specifications are
subject to change without notice. Any change will be reflected in future printings.
New Focus
3635 Peterson Way
Santa Clara, CA, 95054
USA
Part No. 90066734 Rev. G

Preface v
Confidentiality & Proprietary Rights
Reservation of Title
The New Focus programs and all materials furnished or produced in connection with
them ("Related Materials") contain trade secrets of New Focus and are for use only
in the manner expressly permitted. New Focus claims and reserves all rights and
benefits afforded under law in the Programs provided by New Focus.
New Focus shall retain full ownership of Intellectual Property Rights in and to all
development, process, align or assembly technologies developed and other
derivative work that may be developed by New Focus. Customer shall not
challenge, or cause any third party to challenge the rights of New Focus.
Preservation of Secrecy and Confidentiality and Restrictions to Access
Customer shall protect the New Focus Programs and Related Materials as trade
secrets of New Focus, and shall devote its best efforts to ensure that all its personnel
protect the New Focus Programs as trade secrets of New Focus. Customer shall not
at any time disclose New Focus's trade secrets to any other person, firm,
organization, or employee that does not need (consistent with Customer's right of
use hereunder) to obtain access to the New Focus Programs and Related Materials.
These restrictions shall not apply to information (1) generally known to the public or
obtainable from public sources; (2) readily apparent from the keyboard operations,
visual display, or output reports of the Programs; 3) previously in the possession of
Customer or subsequently developed or acquired without reliance on the New Focus
Programs; or (4) approved by New Focus for release without restriction.
Trademarks
The New Focus logo and name are registered trademarks of Newport Corporation in
Mexico, Israel, Singapore, European Union, Taiwan, Hong Kong, China, Japan,
Korea, Canada, Australia, and the United States.
Service Information
This section contains information regarding factory service for the source. The user
should not attempt any maintenance or service of the system or optional equipment
beyond the procedures outlined in this manual. Any problem that cannot be
resolved should be referred to New Focus.

vi Preface
Technical Support Contacts
North America Europe
New Focus
3635 Peterson Way, Santa Clara, CA 95054
Telephone: [phone]
Telephone: [phone]
Newport/MICRO-CONTROLE S.A.
Zone Industrielle
45340 Beaune la Rolande, FRANCE
Telephone: [phone]
Asia
Newport Opto-Electronics Technologies
中国 上海市 爱都路 253号 第3号楼 3层
C部位, 邮编 200131
253 Aidu Road, Bld #3, Flr 3, Sec C,
Shanghai 200131, China
Telephone: [phone]
Fax: [phone]
Newport Corporation Calling Procedure
If there are any defects in material or workmanship or a failure to meet
specifications, promptly notify Newport's Returns Department by calling 1-800-222-
6440 or by visiting our website at www.newport.com/returns within the warranty
period to obtain a Return Material Authorization Number (RMA#). Return the
product to Newport Corporation, freight prepaid, clearly marked with the RMA# and
we will either repair or replace it at our discretion. Newport is not responsible for
damage occurring in transit and is not obligated to accept products returned without
an RMA#.
E-mail: [e-mail]
When calling New Focus Corporation, please provide the customer care
representative with the following information:
Your Contact Information
Serial number or original order number
Description of problem (i.e., hardware or software)
To help our Technical Support Representatives diagnose your problem, please note
the following conditions:
Is the system used for manufacturing or research and development?
What was the state of the system right before the problem?
Have you seen this problem before? If so, how often?
Can the system continue to operate with this problem? Or is the system non-
operational?
Can you identify anything that was different before this problem occurred?

Preface vii
Table of Contents
EU27 DECLARATION OF CONFORMITY ....................................... ii
UK DECLARATION OF CONFORMITY.......................................... iii
Warranty................................................................................................ iv
Technical Support Contacts .................................................................. vi
Table of Contents ................................................................................. vii
List of Figures .........................................................................................x
1Safety Precautions 11
1.1 Definitions and Symbols .............................................................11
1.1.1 General Warning or Caution ...........................................11
1.1.2 Electric Shock..................................................................11
1.1.3 Potential Burn Hazard .....................................................11
1.1.4 European Union CE Mark ...............................................12
1.1.5 UKCA Mark ....................................................................12
1.1.6 Alternating voltage symbol .............................................12
1.1.7 On ....................................................................................12
1.1.8 Off....................................................................................12
1.1.9 Ground.............................................................................13
1.1.10 DC Symbol ......................................................................13
1.1.11 Waste Electrical and Electronic Equipment (WEEE) .....13
1.1.12 Control of Hazardous Substances....................................13
1.2 Warnings and Cautions................................................................14
1.2.1 General Warnings............................................................14
1.2.2 General Cautions .............................................................15
1.2.3 Summary of Warnings and Cautions...............................15
1.3 Location of Labels and Warnings................................................18
1.4 Safety Grounding Considerations................................................19
2General Information 21
2.1 System Overview.........................................................................21
2.2 Scope of this Manual ...................................................................22
2.3 Unpacking and Inspection ...........................................................22
2.3.1 What is included ..............................................................22
2.4 Available accessories...................................................................22
2.5 Safety ...........................................................................................23
2.6 Specifications ..............................................................................24

viii Preface
2.6.1 Operating Limits*............................................................24
2.6.2 Weight, Dimensions ........................................................25
3Theory of Operation 26
3.1 How the Picomotor Actuator Works ...........................................26
3.2 Stepping the Picomotor with the 8742 Controller/Driver ...........26
3.3 Status Indicator............................................................................27
3.4 Power Supply...............................................................................28
3.4.1 Fault Protection ...............................................................28
3.5 Input / Output Connections .........................................................29
3.5.1 USB .................................................................................30
3.5.2 Ethernet............................................................................30
3.5.3 RS-485.............................................................................30
3.5.4 Power ...............................................................................30
3.5.5 Picomotor Interfaces........................................................30
3.6 Mounting the unit ........................................................................31
4Initial Setup 32
4.1 Introduction .................................................................................32
4.2 Grounding....................................................................................32
4.3 Power ...........................................................................................32
4.4 Connecting 8742 to a Computer via USB ...................................32
4.5 Connecting 8742 to a Computer via Ethernet .............................33
4.5.1 Connecting to a Router....................................................33
4.6 Picomotor Connections ...............................................................33
4.7 Connecting Multiple Units to a Computer ..................................34
4.7.1 Using USB Hubs .............................................................35
4.7.2 Using Ethernet Routers/Switchers...................................36
4.7.3 Using RS-485 LAN to Daisy-Chain................................37
4.8 Connecting to the 8758 Hand Control Pad..................................39
5Computer Interfacing 41
5.1 Introduction .................................................................................41
5.2 Computer Interface Terminology ................................................41
5.3 USB Communication...................................................................41
5.3.1 USB Command Termination...........................................42
5.4 Ethernet Communication.............................................................42
5.4.1 Ethernet Dynamic and Static IP Address Setup ..............43

Preface ix
5.4.2 Using a Static IP Address ................................................43
5.4.3 Ethernet Peer-to-Peer Cabling.........................................46
5.4.4 Communicating Using a Hostname.................................46
5.5 RS-485 Communication ..............................................................47
5.5.1 Setting up an RS-485 Network........................................48
5.5.2 Communication with a Slave Controller .........................49
5.6 Picomotor Controller Software Application................................50
5.6.1 Introduction .....................................................................50
5.6.2 Overview .........................................................................51
5.6.3 Embedded Dynamic HTTP Server..................................62
5.7 LabVIEWTM and C# Programming Support ...............................63
5.7.1 Introduction .....................................................................63
6Remote Command Set 64
6.1 Command Syntax ........................................................................64
6.1.1 RS-485 Command Syntax ...............................................65
6.1.2 Summary of Command Syntax .......................................66
6.2 Command List .............................................................................67
6.2.1 Description of Commands...............................................69
7Appendix 97
7.1 Non Axis-Specific Error Messages .............................................97
7.2 Axis-Specific Error Messages .....................................................98
8Maintenance and Service 100
8.1 Enclosure Cleaning....................................................................100
8.2 Technical Support......................................................................100
8.3 Service .......................................................................................101
8.4 Obtaining Service ......................................................................101
8.5 Warranty ....................................................................................101
8.6 Service Form .............................................................................102

x Preface
List of Figures
General Warning or Caution Symbol ........................................... 11
Electrical Shock Symbol............................................................... 11
Hot Surface Symbol..................................................................... 11
CE Mark........................................................................................ 12
UKCA Mark.................................................................................. 12
Alternating Voltage Symbol ......................................................... 12
On Symbol .................................................................................... 12
Off Symbol.................................................................................... 12
Ground Symbol............................................................................ 13
DC Symbol.................................................................................... 13
WEEE Directive Symbol .............................................................. 13
RoHS Compliant Symbol ............................................................. 13
Labels and Warnings..................................................................... 18
Status Indicators position.............................................................. 27
Heatsink mounting slots................................................................ 29
8742 Inputs and Outputs ............................................................... 29
L-bracket ....................................................................................... 34
Using L-brackets to stack up several Controllers ......................... 34
Connecting four units to a computer via a USB hub .................... 35
Connecting three units to a computer via an Ethernet router........ 36
Connecting four units to a computer via RS-485 LAN ................ 37
Connecting four units to a computer via RS-485 adapter............. 38
Single Controller Setup................................................................. 39
Multiple Controller Setup ............................................................. 40
Picomotor Controller RS-485 LAN Topology ............................. 48
Picomotor Application Software................................................... 50
Controller Address Identification ................................................. 51
Jog Tab.......................................................................................... 52
Cycle Tab ...................................................................................... 53
Terminal Tab................................................................................. 54
Controller Setup Window ............................................................. 55
Ethernet Setup Window ................................................................ 56
Options Window ........................................................................... 57
Properties Window........................................................................ 58
Controller Scan ............................................................................. 59
Address Conflict Resolution Window .......................................... 60
Device Address Window .............................................................. 61
Internet Browser View .................................................................. 62
Command Syntax Diagram........................................................... 64

1 Safety Precautions
1.1 Definitions and Symbols
The following terms and symbols are used in this documentation and also appear on
the Model 8742 Controller/Driver where safety-related issues occur.
1.1.1 General Warning or Caution
General Warning or Caution Symbol
The Exclamation Symbol in the figure above appears on the product and in Warning
and Caution tables throughout this document. This symbol designates that
documentation needs to be consulted to determine the nature of a potential hazard,
and any actions that have to be taken.
1.1.2 Electric Shock
Electrical Shock Symbol
The Electrical Shock Symbol in the figure above appears throughout this manual
and on the product. This symbol indicates a hazard arising from dangerous voltage.
Any mishandling could result in irreparable damage to the equipment, and personal
injury or death.
1.1.3 Potential Burn Hazard
Hot Surface Symbol
The Hot Surface Symbol in the figure above appears throughout this manual and on
the product. This symbol indicates a hazard arising from a high temperature. Any
mishandling could result in personal injury.

12 Safety Precautions
1.1.4 European Union CE Mark
CE Mark
The presence of the CE Mark on New Focus equipment means that this instrument
has been designed, tested and certified compliant to all applicable European Union
(CE) regulations and recommendations.
1.1.5 UKCA Mark
UKCA Mark
The presence of the UKCA Mark on New Focus equipment means that this
instrument has been designed, tested and certified compliant to all applicable United
Kingdom regulations and recommendations.
1.1.6 Alternating voltage symbol
Alternating Voltage Symbol
This international symbol implies an alternating voltage or current.
1.1.7 On
I
On Symbol
The symbol in the figure above represents a power switch position on a Model 8742.
This symbol represents a Power On condition.
1.1.8 Off
Off Symbol
The symbol in the figure above represents a power switch position on the Model
8742. This symbol represents a Power Off condition.
~

Safety Precautions 13
1.1.9 Ground
Ground Symbol
The symbol in the figure above appears on the Model 8742 to indicate the screw to
be used to ground the case of the unit. This symbol identifies the frame or chassis
terminal.
1.1.10 DC Symbol
DC Symbol
This international symbol implies an unvarying current or voltage.
1.1.11 Waste Electrical and Electronic Equipment (WEEE)
WEEE Directive Symbol
This symbol on the product or on its packaging indicates that this product must not
be disposed with regular waste. Instead, it is the user responsibility to dispose of
waste equipment according to the local laws. The separate collection and recycling
of the waste equipment at the time of disposal will help to conserve natural
resources and ensure that it is recycled in a manner that protects human health and
the environment. For information about where the user can drop off the waste
equipment for recycling, please contact your local New Focus representative.
1.1.12 Control of Hazardous Substances
RoHS Compliant Symbol
This label indicates the products comply with the EU Directive 2002/95/EC that
restricts the content of six hazardous chemicals.

14 Safety Precautions
1.2 Warnings and Cautions
The Model 8742 is a component of a system that will contain one or more
Picomotors and other items. Since New Focus cannot control these other system
components, the User is ultimately responsible for ensuring that the complete system
meets all applicable product and workplace safety regulations. Specific attention
should be directed to the description of safety grounding concerns described in
Section 1.4, below.
The following are definitions of the Warnings, Cautions and Notes that are used
throughout this manual to call your attention to important information regarding
your safety, the safety and preservation of your equipment or an important tip.
WARNING
Situation has the potential to cause bodily harm or death.
CAUTION
Situation has the potential to cause damage to property or
equipment.
NOTE
Additional information the user or operator should consider.
Situation has the potential to cause the product to not comply
with applicable European Union regulations.
Situation has the potential to cause the product to not comply
with applicable United Kingdom regulations.
1.2.1 General Warnings
Observe these general warnings when operating or servicing this equipment:
•Heed all warnings on the unit and in the operating instructions.
•Do not use this equipment in or near water.
•Although the input power to this equipment is below 20 VDC, this
equipment internally generates much higher voltages that are present
on the Model 8742 connector pins. Only properly trained personnel
should touch either of these items.
•The Model 8742 is intended to be used as a component in a larger
system. When this product is included as part of a larger assembly,
the user MUST ensure that appropriate additional safety and EMC-
compliance features are incorporated the assembly.

Safety Precautions 15
•The Model 8742 is typically supplied with an external DC power
source. When the external power source is connected to MAINS
power, the external power source’s detachable power cord may be
used to disconnect power to the 8742. Do not position the external
power supply so that its MAINS power cord cannot be easily
disconnected.
•Disconnect power before cleaning the equipment. Do not use liquid
or aerosol cleaners; use only a damp lint-free cloth.
•Lockout all electrical power sources before servicing the equipment.
•There are no user-replaceable fuses in this equipment. The user
must ensure that appropriate current-limiting protection is provided
by the external DC power source.
•To avoid explosion, do not operate this equipment in an explosive
atmosphere.
•Qualified service personnel should perform safety checks after any
service.
•Use only the New Focus-supplied MAINS power cord with the
external DC supply. Use of under-rated power cords and cause
property damage
1.2.2 General Cautions
Observe these cautions when operating this equipment:
•If this equipment is used in a manner not specified in this manual,
the protection provided by this equipment may be impaired.
•Do not block ventilation openings.
•Use only the specified replacement parts.
•Follow precautions for static sensitive devices when handling this
equipment.
•This product should only be powered as described in the manual.
•There are no user-serviceable parts inside the Model 8742
Picomotor Drive Module.
1.2.3 Summary of Warnings and Cautions
The following general warning and cautions are applicable to this instrument:
WARNING
The Picomotor Controller/Driver is incomplete in constructional
features and is considered only to be a component for the
purposes of regulatory compliance. It is “equipment for building
in;” a suitable enclosure must be provided so that the unit is not
user accessible when incorporated into the final product.

16 Safety Precautions
WARNING
The Model 8742 Picomotor Controller/Driver internally generates
non-SELV voltages. These voltages are present, at times, on the
Picomotor connectors even when a Picomotor is not connected.
The user shall mount the Model 8742 with appropriate barriers,
spacings, markings, etc. to ensure that all applicable regulatory
requirements are met. THIS IS THE USER’S RESPONSIBILITY.
WARNING
Do not attempt to operate this equipment if there is evidence of
shipping damage or you suspect the unit is damaged. Damaged
equipment may present additional hazards to you. Contact New
Focus technical support for advice before attempting to plug in
and operate damaged equipment.
WARNING
The Model 8742 is intended for use ONLY with New Focus
Picomotors. Connection of other devices to the unit’s motor
connectors may cause damage to the unit or the connected
device, fire, and/or personal injury.
WARNING
Before operating the Model 8742 Picomotor Driver, please read
and understand all of Section 1.
WARNING
Do not attempt to operate this equipment if there is evidence of
shipping damage or you suspect the unit is damaged. Damaged
equipment may present additional hazards to you. Contact New
Focus technical support for advice before attempting to plug in
and operate damaged equipment.
WARNING
Do not apply external DC power to this equipment in excess of
14.5 VDC.
WARNING
Use only the New Focus-supplied MAINS power cord with the
external DC power supply. Use of an under-rated power cord
may cause damage to the product, fire, and/or personal injury.

Safety Precautions 17
CAUTION
There are no user serviceable parts inside the Model 8742
Picomotor Controller/Driver. Work performed by persons not
authorized by New Focus will void the warranty.
WARNING
If this equipment is used in a manner not specified in this
manual, the protection provided by this equipment may be
impaired.
WARNING
This instrument is intended for use by qualified personnel who
recognize thermal, shock, or laser hazards and are familiar with
safety precautions required to avoid possible injury. Read the
instruction manual thoroughly before using, to become familiar
with the instrument’s operations and capabilities.
CAUTION
The Model 8742 Picomotor Controller/Driver is designed to be
safe when operated under Normal Environmental Conditions as
defined in EN61010-1:2010. Operation under harsher
environmental conditions can result in severe injury.
CAUTION
The case of the Model 8742 Picomotor Controller/Driver is used
to dissipate internally-generated heat. Blocking the normal
convective airflow around the unit, or thermally insulating the
unit, can result in severe injury, damage to the product, and/or
fire.
CAUTION
When operated at higher pulse rates for extended periods of
time, the temperature on the outside of the Model 8742’s case
may rise above the “surface temperature limits in normal
operation” as defined in EN61010-1:2010 unless the user takes
appropriate measures. These may include the addition of an
external heat sink, barriers to contact, reducing the pulse
frequency, or other appropriate mitigations. Failure to take
appropriate action when operating the Model 8742 under these
conditions can result in severe injury.

18 Safety Precautions
The Model 8742 Picomotor Controller/Driver is intended for use
in an industrial laboratory environment. Use of this product in
other environments, such as residential, may result in
electromagnetic compatibility difficulties due to conducted as
well as radiated disturbances.
The Model 8742 Picomotor Controller/Driver is intended for use
in an industrial laboratory environment. Use of this product in
other environments, such as residential, may result in
electromagnetic compatibility difficulties due to conducted as
well as radiated disturbances.
1.3 Location of Labels and Warnings
Labels and Warnings
CE Mark
Power
Supply
Voltage and
Current
Serial Number
and WEEE
Symbol
Chassis Ground
Label
High
Voltage
Warning
Symbol
Model
Number
Applicable
US Patents

Safety Precautions 19
1.4 Safety Grounding Considerations
There are potentially lethal voltages generated within the Model 8742 Picomotor
Controller/Driver and presented on the pins of the “Motor” connectors EVEN
WHEN NO PICOMOTOR IS INSTALLED. (These voltages are not present when
power is not applied to the unit. They are not present when the unit is switched
OFF.) The User must manage certain system-level aspects to ensure safe operation.
One of these is grounding.
The Model 8742’s external DC power supply provides 12VDC. The negative output
from this supply is typically isolated from MAINS earth ground, but this isolation
should not be assumed. This same negative output is connected directly to the
Model 8742’s external case within the Model 8742. This same “ground” is at the
same potential as the MOTOR connectors’ return signal pins. This means that the
MOTOR connectors’ drive signal pins are, at times, at VERY HIGH VOLTAGES
relative to the Model 8742 case, the USB connector shell, and the DC input/loop-
through connectors’ negative terminals.
An 8-32 screw is provided on the unit and marked with the “Ground” symbol shown
in Paragraph 1.1.8, above. While it is not necessary to connect this terminal to a
building “earth” ground, New Focus recommends doing so because it will simplify
system-level compliance with most regulatory requirements. Once this connection
is made, the user must ensure that all other system components are appropriately
grounded. Do not depend upon the physical mounting hardware to accomplish this
grounding.
If the other components are not grounded, a damaged Picomotor (or its wire) could
result in a dangerously high voltage being present between anything that is grounded
(like the 8742 and a computer attached to it via USB) and the Picomotor case. Note
that the simplest way to ground a Picomotor is via its threaded mounting bushing or
other mounting hardware. DO NOT ATTEMPT TO OPEN A PICOMOTOR TO
ACHIEVE THIS GROUNDING.
If system requirements prevent the Picomotor from being grounded, then the user
must ensure that the Model 8742 and all other system components (including any
USB-connected computers) are properly isolated from earth ground. This is because
a short of the high-voltage drive signal to an earth ground may result in potentially
lethal voltages existing between the case of the 8742 and anything that is earth
grounded, such as a floor. The User is advised to consult all applicable regulations

20 Safety Precautions
because this insulation will probably need to have a breakdown voltage of several
thousand volts due to lightening concerns.
In summary, New Focus strongly recommends grounding the Model 8742’s case.