natus XLTEK EEG32U Troubleshooting guide

XLTEK EEG32U
User and Service Manual

User and Service Manual XLTEK EEG32U Amplifier
1
Publisher’s Notice
105491 Rev O
XLTEK EEG32U
Natus Medical Incorporated
DBA Excel-Tech Ltd. (XLTEK)
2568 Bristol Circle Oakville,
Ontario L6H 5S1 Canada
Tel: [phone] or Fax: [phone]
Toll Free (US & Canada): 800-303-0306
Technical Support Email: [e-mail]
Website: www.natus.com
EUROPEAN AUTHORIZED REPRESENTATIVE
Natus Manufacturing Limited
IDA Business Park Gort, Co.
Galway Ireland
ISO 13485 Certified
Copyright © 2019 by Natus Medical Incorporated.
Issued in January 2019.
All rights reserved. This manual contains proprietary information, which is protected by copyright and may not be copied in
whole or in part except with the prior written permission of Natus Medical Incorporated. The copyright and the foregoing
restrictions on the copyright use extend to all media in which this information is preserved.
This copy of the User Manual shall be used only in accordance with the conditions of sale of Natus Medical Incorporated
or its distributors. Natus Medical Incorporated makes no representations or warranties of any kind whatsoever with
respect to this document. Natus Medical Incorporated disclaims all liabilities for loss or damage arising out of the
possession, sale, or use of this document.

XLTEK EEG32U Amplifier User and Service Manual
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Table of Contents
Introduction........................................................................................................................ 4
Product Intended Use ................................................................................................................4
Essential Performance...............................................................................................................4
Using the Manual........................................................................................................................4
Manual Conventions...........................................................................................................................................5
Specifications: EEG32U Amplifier.................................................................................. 6
EEG32U Safety and Standards Conformity................................................................... 8
Standards of Compliance and Normative References...........................................................8
Declaration of Compliance for IEC 60601-1-2.......................................................................10
Declaration of Compliance for FCC .......................................................................................14
Warnings and Cautions.................................................................................................. 15
General Warnings.....................................................................................................................15
Electrical Warnings and Cautions..........................................................................................16
Patient Environment Warnings and Cautions.......................................................................17
Transportation Warnings.........................................................................................................18
Conducted Immunity Warnings..............................................................................................18
Procedures and Warnings ............................................................................................. 19
Electrostatic Discharge (ESD) Handling................................................................................19
Conducted Immunity Procedures and Warnings .................................................................19
Description of Symbols.................................................................................................. 21
Product Images................................................................................................................ 23
EEG32U Headbox.....................................................................................................................23
Unpacking ........................................................................................................................ 24
Setting Up......................................................................................................................... 25
Placement of the Operator and Patient .........................................................................................................25
Beginning a study .............................................................................................................................................25
Powering Down the System ............................................................................................................................25
Connecting to a Computer......................................................................................................26
Testing the EEG32U Amplifier................................................................................................26
Calibration and Verification..............................................................................................................................27

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Channel Test .....................................................................................................................................................27
Impedance Check.............................................................................................................................................28
Transport System Specifications and Maintenance................................................... 30
XLTEK Trolley Specifications.................................................................................................30
Maintenance..............................................................................................................................31
Warnings and Cautions...........................................................................................................31
Electrical Input and Isolation Transformer Details...............................................................31
Maintenance, Cleaning, & Disposal.............................................................................. 32
Recommendations ...................................................................................................................32
Disposal.....................................................................................................................................33
Troubleshooting.............................................................................................................. 34
Theory of Operation:....................................................................................................... 35
Introduction...............................................................................................................................35
System Overview......................................................................................................................35
Features of the EEG32U System...................................................................................................................35
Components of the Communications Link ....................................................................................................35
Power Sources to the Headbox......................................................................................................................35
Circuit Board Assemblies inside the Headbox.....................................................................35
A. Analog Board.............................................................................................................................................35
B. Digital Board ..............................................................................................................................................36
Getting Help ..................................................................................................................... 37
EEG Accessories & Replacement Parts....................................................................... 38
Index.................................................................................................................................. 39

XLTEK EEG32U Amplifier User and Service Manual
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Introduction
The XLTEK EEG32U amplifier offers advanced signal acquisition capabilities for accurate data
acquisition with 1kHz sampling rates and 16 bit analog-to-digital data conversion. The highest signal-to-
noise ratios and fast recovery from saturation for stable baselines are available with the EEG32U. This
rugged device was designed with extensive clinical input to meet the workflow and application needs of
the basic EEG Lab.
EEG32U features include:
•USB connectivity to XLTEK Desktop or Laptop
•32 referential channels
•Patient-event switch interface
•Photic-stimulator interface for EEG applications
WARNING: We strongly recommend that you read the Warnings and Cautions section of
this manual before operating this amplifier.
Product Intended Use
The EEG32U Amplifier is intended to be used as an electroencephalograph to acquire, display, store and
archive electrophysiological signals. The amplifier should be used in conjunction with Natus
NeuroWorks™ software to acquire scalp electroencephalographic (EEG) signals.
The EEG32U Amplifier is intended to be used by trained medical professionals, and is designed for use in
clinical environments such as hospital rooms and epilepsy monitoring units. It can be used with patients
of all ages, but is not designed for fetal use.
Essential Performance
Essential performances of the EEG32U amplifier are identified in the standard IEC 60601-2-26:2012.
Essential performance relates to the quality of the signal recorded from the amplifier. Specific essential
performances are:
(1) accuracy of signal reproduction
(2) dynamic range and differential offset voltage
(3) input noise level
(4) frequency response
(5) common mode rejection
The definition of these essential performances can be found in the standard.
Using the Manual
This manual describes the theory, features, set up, operation and maintenance of the EEG32U amplifier.
It also provides information on specifications, troubleshooting and getting help.
When reviewing the procedures, we recommend you read the entire section first, before beginning a
sequence. Please follow the instructions carefully.

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Manual Conventions
Various symbols and typographical conventions are used throughout the manual. The following
table illustrates them and describes their meanings and functions.
Symbol/
Convention
Description/Function
This symbol denotes a warning or important information that should not be
missed. Read all warnings and cautions carefully before starting the system for
the first time.
A note that contains important supplemental information.
Bold
Names of control keys, function keys, options, and labels are shown in bold.
Bold text is also used to emphasize important names or ideas.
Italic
Italic text is used for captions.

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Specifications: EEG32U Amplifier
Specification
Value(s)
Analog Specifications Channels
Referential Channels
32
Differential Input Impedance
≥ 100 MOhms
Common Mode Input Impedance
≥ 50 MOhms
Common Mode Rejection Ratio
-110 dB @ 60 Hz
Channel Bandwidth
0.1 Hz to 400 Hz
Input Noise (peak to peak)
3.0 µV @ 0.1Hz~70 Hz bandwidth
Input Noise (RMS)
0.65 μV @ 0.1Hz~70 Hz bandwidth
EEG Channel Hardware Gain
125
Maximum Differential AC Input Before Clipping
(Referential)
± 20 mV
Maximum Operational DC Input Voltage
Electrode Offset
± 1000 mV
Input Bias Current
≤ 20 pA
Channel Crosstalk
70 dB
Photic Stim Interface
Photic Stim Output
1 (TTL level, active high)
Photic Stim Input
1 (TTL level, active high)
User Interface
Push Buttons
1 (Impedance Check)
Event Switch Connection
1 on board
LED Indication
68 on board.
Digital Specifications
Sampling Frequency
256, 512 and 1024 Hz
Sampling Resolution - EEG Channels
16 bits
Sampling Quantization - EEG Channels
600 nV

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Specification
Value(s)
Modes of Operation
Power Consumption
<1 W @ 5 V
Impedance Check
< 2.5, < 5, < 10, < 25 KOhms
Channel Test Signal
Programmable
Sine: 16-32 Hz, 158-10110 μV peak-to-peak
Square: 0.25-0.5 Hz, 50-6400 μV peak-to-
peak
Host Interface
USB 2.0
USB 2.0 Full Speed (12Mbit/sec).
Amplifier Mechanical
Interface Cable
USB 2.0 cable, maximum 3m
Approximate Size
160 mm (l) x 97mm (w) x 29mm (d)
Environmental Conditions for Use
Operating Environmental Limits
Temperature: 10° to 40°C
Relative Humidity: 30%-75%
Atmospheric Pressure: 700 hPa-1060 hPa
Transport and Storage Temperature Range
- 25°C to 60°C
Transport and Storage Humidity Range
10-95%, including condensing
Transport and Storage Atmospheric Pressure
Range
500 hPa to 1060 hPa

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EEG32U Safety and Standards Conformity
Standards of Compliance and Normative References
32 Channel Electroencephalograph (EEG) Headbox; model EEG32U; rated 5Vdc,0.2A
1. Type of protection against electric shock: Class II
2. Degree of protection against electric shock: Type BF
3. Degree of protection against ingress of water: IPX0
4. Degree of safety of application in the presence of a flammable anaesthetic mixture with air or
with oxygen or nitrous oxide: Equipment not suitable for use in the presence of a flammable
anaesthetic mixture with air or with oxygen or nitrous oxide.
5. Mode of operation: Continuous
6. Environmental Conditions: Normal: 10-40°C, 30-75% rH, 700-1060hPa
The EEG32U and its accessories have been designed to comply with the following national and
international standards.
Table 1 –Safety Standard of Compliance and Normative References
CAN /CSA-C22.2 No. 60601-1:
08(R2013) + C2:2011
ANSI/AAMI ES60601-1:2005/(R)2012 +
C1:2009/(R)2012 and A2:2010/(R)2012
IEC 60601-1:2005 + C1:2006 and
C2:2007, Third Edition
CENELEC EN 60601-1:2006 + A1:2013
Medical electrical equipment –Part 1: General requirements
for basic safety and essential performance
IEC 60601-1-6:2010, Edition 3.0
Medical electrical equipment –Part 1-6: General
requirements for basic safety and essential performance –
Collateral standard: Usability
IEC 62366:2007, Edition 1.0
Medical devices –Application of usability engineering to
medical devices
IEC 60601-2-26:2012, Edition 3
CENELEC EN 60601-2-26L2003, Edition
2
Medical electrical equipment –Part 2-26: Particular
requirements for the safety of electroencephalographs
EN ISO 80601-2-61:2011, Edition 1
Medical electrical equipment –Part 2-61: Particular
requirements for basic safety and essential performance of
pulse oximeter equipment
Table 2 –EMC Standard of Compliance and Normative References
IEC 60601-1-2, Edition 4.0, February
1, 2014
Medical electrical equipment –Part 1-2: General
requirements for basic safety and essential
performance–collateral standard: electromagnetic
compatibility –requirements and tests

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IEC 61000-4-2:2008, ed 2.0
Electromagnetic Compatibility (EMC) Part 4-2: Testing
and Measurement Techniques - Electrostatic
Discharge Immunity Test
IEC 61000-4-3 ed 3.0 with
A1:2007+A2:2010
Electromagnetic Compatibility (EMC) Part 4-3: Testing
and Measurement Techniques - Radiated, Radio-
frequency, Electromagnetic Field Immunity Test
IEC 61000-4-4:2012, ed 3.0
Electromagnetic Compatibility (EMC) Part 4-4: Testing
and Measurement Techniques - Electrical Fast
Transient/Burst Immunity Test
IEC 61000-4-5:2014, ed 3.0
Electromagnetic Compatibility (EMC) Part 4-5: Testing
and Measurement Techniques - Surge Immunity Test
IEC 61000-4-6 ed 2.0 with A1:2004 +
A2:2006
Electromagnetic Compatibility (EMC) Part 4-6: Testing
and Measurement Techniques - Immunity to
Conducted Disturbances, Induced by Radio-frequency
Fields
IEC 61000-4-8:2009, ed 2.0
Electromagnetic Compatibility (EMC) Part 4-8: Testing
and Measurement Techniques - Power Frequency
Magnetic Field Immunity Test
IEC 61000-4-11:2004, ed 2.0
Electromagnetic Compatibility (EMC) Part 4-11:
Testing and Measurement Techniques - Voltage Dips,
Short Interruptions and Voltage Variations Immunity
Tests
IEC 61000-3-2:2014, ed 4.0
Electromagnetic Compatibility (EMC) Part 3-2: Limits -
Limits for Harmonic Current Emissions
IEC 61000-3-3:2013, ed 3.0
Electromagnetic Compatibility (EMC) Part 3-3: Limits -
Limitation of Voltage Changes, Voltage Fluctuations
and Flicker in Public Low-voltage Supply Systems
CISPR 11 ed 5.0 with A1:2010
Industrial, Scientific and Medical (ISM) Radio-
Frequency Equipment - Electromagnetic Disturbance
Characteristics - Limits and Methods of Measurement

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Declaration of Compliance for IEC 60601-1-2
Table 1 - Electromagnetic Emissions
Guidance and manufacturer’s declaration – electromagnetic emissions
The EEG32U is intended for use in the electromagnetic environment specified below. The customer or the user
of the EEG32U should assure that it is used in such an environment.
Emissions Test
Compliance
Electromagnetic Environment - Guidance
RF emissions
CISPR 11
Group 1
The EEG32U uses RF energy only for its internal
function. Therefore, its RF emissions are very low and
not likely to cause any interference in nearby
electronic equipment
RF emissions
CISPR 11
Class A
The EEG32U is suitable for use in all establishments
other than domestic and those directly connected to
the public low-voltage power supply network that
supplies buildings used for domestic purposes.
Harmonic emissions IEC
61000-3-2
Class A
Voltage fluctuations/
flicker emissions
IEC 61000-3-3
Complies

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Table 2 - Electromagnetic Immunity
Guidance and manufacturer’s declaration – electromagnetic immunity
The EEG32U is intended for use in the electromagnetic environment specified below. The customer or the user
of the EEG32U should assure that it is used in such an environment.
Immunity Test
IEC 60601
Test Level
Compliance
Level
Electromagnetic Environment - Guidance
Electrostatic
Discharge (ESD)
IEC 61000-4-2
±8 kV contact
±15 kV air
Complies
Floors should be wood, concrete or ceramic
tile. If floors are covered with synthetic
material, the relative humidity should be at
least 30%.
Electrostatic fast
transient/burst
IEC 61000-4-4
±2 kV, 100Khz for
power supply lines
±1 kV, 100Khz for
input/output lines
Complies
Mains power quality should be that of a
typical commercial or hospital environment.
Surge
IEC 61000-4-5
±1 kV differential
mode
±2 kV common
mode
Complies
Mains power quality should be that of a
typical commercial or hospital environment.
Voltage dips, short
interruptions and
voltage variations on
power supply input
lines
IEC 61000-4-11
<100% drop, 0/5
periods, 0°, 45°,
90°, 135°, 180°,
225°, 270°, 315°
100% dip, 1
period
30% dip, 25/30
periods
40% dip for 5
cycles
Complies
Mains power quality should be that of a
typical commercial or hospital environment. If
the user of the EEG32U requires continued
operation during power mains interruption, it
is recommended that the EEG32U be
powered from an uninterruptible power
supply or a battery.
Power frequency
(50/60 Hz) magnetic
field
IEC 61000-4-8
30 A/m
Complies
Power frequency magnetic fields should be at
levels characteristic of a typical location in a
typical commercial or hospital environment.
NOTE: UT is the AC supply voltage prior to application of the test level.

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Table 3 - Electromagnetic Immunity–for EQUIPMENT and SYSTEMS that are not LIFE-
SUPPORTING
Guidance and manufacturer’s declaration – electromagnetic immunity
The EEG32U is intended for use in the electromagnetic environment specified below. The customer or the user
of the EEG32U should assure that it is used in such an environment
Immunity test
IEC 60601
Test Level
Compliance
Level
Electromagnetic Environment - Guidance
Conducted RF IEC
61000-4-6
Radiated RF IEC
61000-4-3
3 Vrms
150 kHz to 80
MHz
3 V/m
80 MHz to 2.7
GHz
3 V
3 V/m
Portable and mobile RF communications
equipment should be used no closer to any
part of the EEG32U, including cables, than
the recommended separation distance
calculated from the equation applicable to the
frequency of the transmitter.
Recommended separation distance
d=1.2 ×√P 150kHz to 80MHz
d=1.2 ×√P 80MHz to 800MHz
d=2.3 ×√P 800MHz to 2.5GHz
where P is the maximum output power rating
of the transmitter in watts (W) according to
the transmitter manufacturer and d is the
recommended separation distance in meters
(m).
Field strengths from fixed RF transmitters, as
determined by an electromagnetic site1
should be less than the compliance level in
each frequency2.
Interference may occur in the vicinity of
equipment marked with the following symbol:
NOTE 1: At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE 2: These guidelines may not apply in all situations. Electromagnetic propagation is affected by
absorption and reflection from structures, objects and people.
1
Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios,
amateur radio, AM and FM radio broadcast and TV broadcast cannot be predicted theoretically with accuracy. To assess the
electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey should be considered. If the measured
field strength in the location in which the EEG32U is used exceeds the applicable RF compliance level above, the EEG32U should
be observed to verify normal operation. If abnormal operation is observed, additional measures may be necessary, such as re-
orienting or relocating the EEG32U.
2
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.

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Table 4 - Test specifications for ENCLOSURE PORT IMMUNITY to RF wireless communications
equipment
Test
frequency
(MHz)
Band a)
(MHz)
Service a)
Modulation b)
Maximum
Power
(W)
Distance
(m)
IMMUNITY
TEST LEVEL
(V/m)
385
380 –390
TETRA 400
Pulse
modulation b)
18 Hz
1,8
0,3
27
450
430 –470
GMRS 460,
FRS 460
FM c)
± 5 kHz deviation
1 kHz sine
2
0,3
28
710
704 –787
LTE Band 13, 17
Pulse
modulation b)
217 Hz
0,2
0,3
9
745
780
810
800 –960
GSM 800/900,
TETRA 800, iDEN
820, CDMA
850,LTE Band 5
Pulse
modulation b)
18 Hz
2
0,3
28
870
930
1,720
1,700 –1,990
GSM 1800;
CDMA 1900;
GSM 1900;
DECT; LTE Band
1, 3, 4, 25;
UMTS
Pulse
modulation b)
217 Hz
2
0,3
28
1,845
1,970
2,450
2,400 –2,570
Bluetooth,
WLAN, 802.11
b/g/n, RFID
2450, LTE Band
7
Pulse
modulation b) 217 Hz
2
0,3
28
5,240
5,100 –5,800
WLAN 802.11
a/n
Pulse
modulationb)
217 Hz
0,2
0,3
9
5,500
5,785
NOTE: If necessary to achieve the IMMUNITY TEST LEVEL, the distance between the transmitting antenna and the ME
EQUIPMENT or ME SYSTEM may be reduced to 1 m. The 1 m test distance is permitted by IEC 61000-4-3.
a) For some services, only the uplink frequencies are included.
b) The carrier shall be modulated using a 50 % duty cycle square wave signal.
c) As an alternative to FM modulation, 50 % pulse modulation at 18 Hz may be used because while it does not represent actual
modulation, it would be worst case.

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Declaration of Compliance for FCC
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.
Warning: Changes or modifications not expressly approved by the manufacturer could void the
user's authority to operate the equipment.

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Warnings and Cautions
General Warnings
NOTE: It is recommended that all data be stored using redundant storage
capabilities. This can help to minimize data loss in the event of a failure of the
primary drive.
Proper use of this device depends on careful reading of all instructions and labels
that come with or on the system.
The EEG32U headbox is classified as an IPX0 –ordinary degree of protection
against ingress of water according to IEC 529. The EEG32U is not water proof.
Inaccurate measurements may be caused by incorrect application or use.
Only qualified personnel should operate this equipment.
Only use the EEG32U amplifier in conjunction with approved devices and
accessories.
Use of cables other than those specified or sold by the manufacturer on the
equipment, may result in increased emissions or decreased immunity of the
equipment and may cause the system to be non-compliant with the requirements of
IEC 60601-1-2:2007
The computer and the peripherals used with the EEG32U headbox and the
NeuroWorks EEG system must either be approved by XLTEK and supplied as part
of an IEC 601 approved system or it must be approved to IEC 950 or similar and
kept outside of the patient environment (that is, the area within 1.5 meters of the
patient laterally and within 2.5 meters of the floor in the area occupied by the
patient).
To ensure the validity of signals, do not operate the device near any sources of
electromagnetic interference.
Turn off the system power before cleaning. Prevent detergent solution or cold
sterilization agents from seeping into the electronics of the system. Be careful
around all connectors and edges. Do not use abrasive agents.
The accessories of this device may include several kinds of disposable, sterile
needle electrodes. These needles may be labeled as STERILE. The EEG32U is not
sterile and cannot be made sterile.

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The sale, distribution, or use of this device is restricted to, by, or on order of a
physician.
WARNING: Third-party software installed on the acquisition computer may interfere
with the operation of the Natus software. Please consult Natus Technical Support
before installing third-party software on the computer.
This device does not contain any hazardous components; therefore, no special
precautions are required for their disposal.
WARNING: No modification of this equipment is allowed.
The EEG32U system should not be used adjacent to or stacked with other
equipment. If adjacent or stacked use is necessary, the amplifier should be observed
to verify normal operation in the configuration in which it will be used.
Portable RF communications equipment (including peripherals such as antenna
cables and external antennas) should be used no closer than 30 cm (12 inches) to
any part of the EEG32U System, including cables specified by the manufacturer.
Otherwise, degradation of the performance of this equipment could result.
Electrical Warnings and Cautions
XLTEK systems are intended for connection to a properly grounded electrical outlet only.
The EEG32U is an electrically isolated, electrically floating device. The computer
that is part of the system should be attached to a properly grounded electrical outlet.
Conductive parts of electrodes and their connectors are not to contact other conductive parts
and earth.
ELECTRICAL SHOCK HAZARD: Do NOT connect electrode inputs to earth ground.
The patient headbox contains warning symbols reminding you that the connections
are intended for isolated patient connections only. Connecting an earth ground might
result in electrocution.
ELECTRICAL SHOCK HAZARD: Do NOT turn on the system power until all cables have
been connected, verified and visually inspected for any damage. Failure to inspect the
cables may result in electrocution. Verification of electrical safety should be performed
routinely.

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ELECTRICAL SHOCK HAZARD: Do NOT service the system. Refer servicing to
qualified personnel only. Do NOT use repaired components without proper testing.
The computer attached to the EEG32U should use a three-wire power cord with a
hospital grade plug. For grounding reliability, only connect the device to a hospital
grade or hospital-only receptacle. Inspect the power cord often for fraying or other
damage. Do NOT operate the system with a damaged power cord or plug.
If there is an isolation transformer with the system, do NOT place the isolation
transformer on the floor. Only plug XLTEK recommended components into the
isolation transformer.
Do NOT connect non-medical equipment which has been supplied as part of the system
directly to the wall outlet when the system is supplied, via MPSO, with a separating
transformer.
Do NOT connect electrical equipment which has not been supplied as a part of the system to
the MPSO.
Patient Environment Warnings and Cautions
NOTE: The patient environment is defined as the area within 1.5 meters of the
patient laterally and within 2.5 meters of the floor in the area occupied by the patient.
Connect all patient electrodes to fully electrically isolated physiological devices only.
Connecting patient electrodes to any other device or external outlet may result in
personal injury.
The patient headbox accepts only touch-proof style electrode inputs. Do NOT
attempt to use any other style of patient electrode input.
To prevent cabling entanglement/strangulation, ensure no loose cables are
accessible to the patient.
No parts of the ME equipment shall be serviced or maintained while in use with a patient.
Patient connections are NOT intended for direct cardiac contact.
Do NOT touch any earth-grounded components of the EEG32U amplifier and the
patient simultaneously.

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Do not use the EEG32U amplifier in the vicinity of MRI or CT systems.
Do not use the EEG32U amplifier with HF surgical equipment.
Do not allow loose electrodes to contact metal parts.
The patient event switch attached to or on the EEG32U or other XLTEK device is
not intended for critical patient-safety-related incidents.
Do NOT use the XLDetect montage with custom channel labels.
As with all medical equipment, carefully route patient cabling to reduce the possibility
of patient entanglement or strangulation.
Transportation Warnings
Make sure that any platform, table, cart, or other surface used during the operation,
transport, or temporary or permanent storage of the system and its components is
adequate, sturdy, and safe. Natus is not responsible for any injury or damage that
may result from inadequate, poorly constructed, or unapproved transports, carts, or
operating surfaces. Natus is not responsible for any injury or damage that may
result from improper cable storage during transport.
TIPPING HAZARD: During transport, the user should guide the cart using both
hands, ensuring the wheel base is aligned so that a single caster leads in the
direction of motion. Failure to lead the cart with one wheel could result in a tipping
hazard when ascending or descending steps or thresholds.
Conducted Immunity Warnings
In environments where parasitic electrical noise interferes with the electrical biologic signal,
there is no risk of misinterpretation of EEG waveforms or ancillary data. Any abnormal
pattern or out of range value is confirmed by trained medical professionals performing the
test. In addition to ancillary data, the accompanying EEG (Electroencephalograph)
amplifier’s signals will also be contaminated past the point where any clinical signal
interpretation is possible. Trained electroencephalographers and technologists are well
equipped to identify and disregard signals that are obscured by environmental noise.

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19
Procedures and Warnings
Electrostatic Discharge (ESD) Handling
Before performing any setup or placement procedures, read the precautions outlined in this section.
WARNING: Be sure to take the appropriate Electrostatic Discharge (ESD) precautions.
Disconnect the cables before moving, cabling, or performing any set up procedures.
Some semiconductor (solid state) devices can be easily damaged by static electricity.
Such components are commonly called Electrostatically Sensitive Devices (ESD). Do not
touch the accessible conductive parts for the Connectors marked with the ESD symbol.
Follow these techniques to help reduce the incidence of component damage caused by
static electricity:
•Immediately before handling any product components assemblies, drain the electrostatic charge
from your body by touching a known earth ground.
•Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing
clothes together or lifting your foot from a carpeted floor can generate enough static electricity to
damage the product components.
•Avoid carpets in cool, dry areas. If provided, leave the product components in their anti-static
packaging until ready to be installed.
•Take care when connecting or disconnecting cables. When disconnecting a cable, always pull on
the cable connector or strain-relief loop, not on the cable itself.
WARNING: A damaged cable can cause a short in the electrical circuit. Prevent
damage to the connectors by aligning connector pins before you connect the cable.
WARNING: Misaligned connector pins can cause damage to system components at
power-on.
Conducted Immunity Procedures and Warnings
Conducted immunity is defined as the ability of an electronic product to tolerate the influence of electrical
energy from other electronic products or electromagnetic phenomena.
The electrical energy from other electronic devices located in nearby equipment are usually propagated
through the connecting cables. The functionality of some Semiconductor devices and high sensitivity
amplifiers (EEG, EMG ECG) may be affected by induced parasitic signals.
This effect could be described as noise and/or channel saturation on the EEG waveforms, which are
coupled together with off the scale values for auxiliary sensors.