Mind Media NeXus-4 User manual

NeXus-4
User Manual
Version 2.0
0344

2
Table of contents
1 Service and support 3
1.1 About this manual 3
1.2 Warranty information 3
2 Safety information 4
2.1 Explanation of markings
2.2 Limitations of use 5
2.3 Safety measures and warnings 5
2. Precautionary measures 7
2.5 Disclosure of residual risk 7
2.6 Information for lay operators 7
3 Product overview 8
3.1 Product components 8
3.2 Intended use 8
3.3 NeXus- views 9
3. User interface 9
3.5 Patient connections 10
3.6 Device label 10
4 nstructions for use 11
.1 Software 11
.2 Powering the NeXus- 12
.3 Transfer data to PC 12
. Perform measurement 13
.5 Mobility 13
5 Operational principles 14
5.1 Bipolar input channels 1
5.2 Auxiliary input channel 1
5.3 Filtering 1
6 Maintenance 15
7 Electromagnetic guidance 16
8 Technical specifications 19

3
1Service and support
1.1 About this manual
This manual is intended for the user of the NeXus- system – referred to as ‘product’ throughout
this manual. It contains general operating instructions, precautionary measures, maintenance
instructions and information for use of the product. Read this manual carefully and familiarize
yourself with the various controls and accessories before starting to use the product.
This product is exclusively manufactured by Twente Medical Systems International B.V. for Mind
Media B.V. Distribution and service is exclusively performed by or through Mind Media B.V.
Mind Media Support can be reached via email ([e-mail]) or by phone during office
hours (CET). Visit our Support section on www.mindmedia.com, because this may resolve your
problem. Always provide as much information on your problem as possible, including serial
numbers of the products.
Address
Mind Media B.V.
Louis Eijssenweg 2B
60 9CD Herten
The Netherlands
Phone [phone]
Website www.mindmedia.com/
mportant
In case of need for repair ALWAYS first contact Mind Media Support. The
support staff will supply you with an RMA number in case a return is
required. Never ship products back to Mind Media without this authorization
and/or RMA number.
1.2 Warranty information
The product, except its cables and accessories, is warranted against failure of materials and
workmanship for a period of 2 years from the date of delivery. Cables and accessories have a
warranty period of 6 months.
Repairs can only be performed by the manufacturer. Warranty will terminate automatically when
the product is opened by any person other than qualified personnel (authorized by Mind Media).
The warranty does not cover the following:
•failure resulting from misuse, accident, modification, unsuitable physical or operating
environment, or improper maintenance
•failure caused by a product for which Mind Media is not responsible
•damage resulting from use of non-approved accessories
•any non-Mind Media products
The warranty is voided by removal or alteration of identification labels on the product or its parts.
Warranty is also voided in case seals on the enclosure are broken. Mind Media does not warrant
uninterrupted or error-free operation of wired or wireless data transmission.
Any technical or other support provided for a product under warranty, such as assistance with
“how-to” questions and those regarding device set-up and installation, is provided without
warranty.

2Safety information
This section contains general warnings, explanation of markings, limitations of use, safety measures,
and precautionary measures that are important for the safe use of the product.
2.1 Explanation of markings
This section explains the various markings and symbols used with the product.
Manual contains important safety information
Attention: read important safety information
Important information / guidance for use
Consult instructions for use
Device has type CF applied parts
Ingress protection rating
Keep dry
CE-certified (93/ 2/EC Annex XII), see declaration of conformity
Identification of the manufacturer
Reference number
Serial number
Contains transmitter module
Contains Bluetooth transmitter
Special EU instructions for disposal are applicable to a product on which this symbol
is placed. The Maintenance section of this manual contains information on how to
dispose of this equipment.

5
2.2 Limitations of use
Limitations of use
•Under federal law (only applicable to the USA) this product may only be
sold by or on the order of a physician or licensed practitioner.
•The product may only be used under the constant supervision of or on the
instructions of a physician or other authorized medical professional.
The product is NOT intended for:
•critical patient monitoring
•use in life support systems
The product is NOT to be:
•used near MRI equipment
•exposed to ionizing radiation
•used on patients undergoing electro surgery
•used in oxygen rich environments (concentration > 25 % at 1 atm)
The product is NOT:
•suitable for use in an inflammable mixture of anesthetics or agents and air,
oxygen or nitrous oxide
•defibrillator proof
•suitable for sterilization
Do not use, store or transport the equipment outside the specified environmental
conditions, this may damage the product.
Do not store or use in environments with Magnetic Resonance Imaging (MRI)
equipment, or equipment capable of emitting diagnostic levels of ionizing radiation.
Apart from the above, there are no contra-indications. There are no known side effects from the use
of this product.
2.3 Safety measures and warnings
Warnings
•Do not combine the use of the product with any other electronic equipment,
except those specified in this manual. Doing so may impair the product’s
emissions and immunity regarding EMC.
•The product can only be used with the accessories designated by the
manufacturer. The use of other accessories may impair the product's
emissions and immunity regarding EMC.
•The accessories supplied with the device can only be used with Mind Media
approved devices.
•Sensors with their own power are not to be connected to any of the inputs.
•Transmission quality decreases when there are other radio devices in the
neighborhood. The wireless transmission may be interfered with by other
equipment.
•The product should not be used adjacent to or stacked with other
equipment. If this is required, then it should be observed if normal
operation of the product in that configuration is confirmed.

6
Warnings
•Before batteries are replaced, disconnect the patient from the device, and
the device is switched off (Indicator led is off). Both batteries have to be
replaced simultaneously, and have to be of the same type. Note the
orientation of the batteries.
•Do not use batteries that contain lithium.
•Do not use rechargeable batteries.
•Do not immerse the product in any liquid.
•The product is to be kept dry. If operated out of office, it must be fitted in a
carrying case that provides an ingress protection of at least IP02.
•Do not expose the product to direct sunlight, heat from a source of thermal
radiation, excessive amounts of dust, moisture, vibrations, or mechanical
shocks.
•Do not incinerate any part of the product.
•If any liquids or moisture penetrate the product or any part thereof have the
product checked by the manufacturer.
•Take care in arranging patient and sensor cables to avoid risk of patient
entanglement or strangulation.
•The manufacturer cannot guarantee safety and performance of the product
when used in conjunction with accessories that are not manufactured or
approved by the manufacturer.
•No modification of this product is allowed. The product should not be
tampered with.
•Do not touch the electrical connectors that are accessible inside the battery
bay if the battery cover is removed.
•Do not touch the connector pins of interface plugs or receptacles.
•Do not open the product using tools.
•The product is not to be used when it is clearly damaged or wet, or suspected
to be wet inside.
•The product connectors contain nickel, avoid prolonged skin contact with
patients with nickel allergy.
•Disposable electrodes, which are used for electrophysiological
measurements, may be a biohazard. Handle, and when applicable dispose
of these materials in accordance with accepted medical practice and any
applicable local, state and federal laws and regulations.
•Reusable electrodes present a potential risk of cross-infection especially
when used on abraded skin, unless they are restricted to a single patient
•To prevent contamination: store electrodes in a separate bag within the
packaging.
•Except for the batteries there are no user serviceable parts within the
product. Repairs can only be performed by the manufacturer.

7
Warnings
•When connecting the system in an IT-network:
•Simultaneous connection of other equipment to the same Bluetooth network
may result in previously unidentified risks to patients, operators or third
parties. Such risks must be identified, analyzed, evaluated and controlled.
Subsequent changes to the Bluetooth network can introduce new risks that
require additional analysis. Changes to the IT-network include: changes to
its configuration, connecting additional items, disconnecting items, updates
and upgrades of connected equipment.
•Clean the product only according to the cleaning instructions in this manual.
Before cleaning, make sure the device is switched off. Never use any
aggressive chemicals to clean the product.
2.4 Precautionary measures
Precautionary measures
•When the distance between the Bluetooth PC receiver and the device
increases or when there are conducting materials in the straight line
between the Bluetooth PC receiver and the device, the signal transmission
is not as reliable.
•Do not use an operating cellular phone within 50 cm of the device to avoid
excessive noise on the signals.
•Sharp bends or winding the cables in a loop smaller than 5 cm diameter may
damage the cables.
•When the product is not in use for a longer time (more than a few days) the
batteries have to be removed to prevent damage in case they start leaking.
•Dispose of batteries according to local regulations.
2.5 Disclosure of residual risk
The risk analysis process for the product has determined that there are no residual risks which need
to be disclosed for the product.
2.6 nformation for lay operators
Operators must convey the following information to patients in case they carry the product out of
the professional’s office:
•Precautions to be taken with respect to environmental temperature and EM fields, ingress of
liquid
•That wireless equipment (network, phone, walkie-talkie) should be kept > m away from the
device
•How to deal with accessories and accessory cables
•How to deal with information provided by indicators and the display
•How to replace batteries

8
3Product overview
3.1 Product components
The product comprises the following functional components:
# tem Description
1. NeXus-4 device The data acquisition device (NeXus- Amplifier).
2. Carrying bag The carrying bag to be used when the system is used in portable
measurement configurations.
3. Software*
(PC Driver)
Device driver with application programming interface. The device is
supplied to you either on CD or via email (download).
4. Accessories
Various other electrodes, sensors and accessories may be delivered
with the package. Refer to the list of supported active sensors to see
which are supported by the product.
5. Suitcase Suitcase is used for storage of the product when not in use.
6. Accompanying
documentation Documentation such as Labels, User Manual and certificates.
* Optional: Software may be sent to you as download by email
The device supports Mind Media approved or manufactured active sensors. A list of supported
sensors can be found on the website: www.mindmedia.com
3.2 ntended use
The product is intended to be used for acquisition of (electro)-physiological signals by, or under
supervision of, a physician. The user must have knowledge of current good practice in physiological
measurement in science and clinical application. The product is intended to be used within a clinical
or home environment and can be used stationary or ambulatory.
Electrophysiological signals (e.g. EEG, EMG or ECG) are measured via the unipolar or bipolar inputs
on the device via electrode leads connected to a patient or subject. Other physiological parameters,
such as respiration, body position, body movement and temperature are measured using the
auxiliary input channel. These types of signals require additional sensor interface modules.
mportant The system does not perform any signal interpretation or signal analysis.
This is left to the researcher/physician.
The system is not intended for use in a life supporting system.
The device transfers the data to the PC by means of a wireless (Bluetooth) connection, where the
signals can be viewed or stored for further processing. The device is powered by a set of batteries.

9
3.3 NeXus-4 views
Front View
Description
GND Patient Ground input
DUAL B POLAR NPUT
(A&B)
Input for dual bipolar input. Two bipolar pairs can be
connected to this input.
C & D Auxiliary input for (active) sensors. A list of compatible
sensors can be found on the website: www.mindmedia.com
3.4 User interface
On/Off Button
The device will switch on when the On/Off button is pressed shortly. When the device is
transmitting data (via optical fiber or Bluetooth), the On/Off button acts as a Marker button. This
will result in a signal in the digital channel of the product. In this case, the device will not shut down.
Status LED
The table below states all possible states of the LED indicators of the device
LED ndicator Meaning Description
OFF System off
The LED indicator does not show LED. The device is off.
ORANGE Startup
At startup the LED lights up orange for about 2-3 seconds.
If LED does not turn green, replace batteries or contact Mind
Media support, there may be a defect.
GREEN Idle, running
LED lights up green when it is transmitting data or ready to
be used.
ORANGE BL NK NG
(~2x per seconds)
Recording
error
A recording error occurred
ORANGE/GREEN
BL NK NG
(~1x per second)
Battery low
Battery is running low.

10
3.5 Patient connections
Patient Ground
The patient ground should always be connected in order to keep the amplifier in range. The location
of the patient ground is ideally away from your measurement electrodes.
Patient Lead Connectors: Bipolar, Auxiliary
The number and type of inputs on your device depend on the configuration you have. NeXus-
devices exist in many different configurations, varying from 2 up to 3 input channels. In general
there are two types of patient connection inputs on the device: bipolar or auxiliary.
Type of input Connector Description
Patient
Ground
Patient ground is used to keep the amplifier in range. The input is
marked with ‘GND’.
Dual Bipolar
input
Used for differential measurements. Leads that fit in the bipolar
inputs have two bipolar cables with 2 snaps per cable going to the
patient. The bipolar input uses a 6 pin connector.
Auxiliary
Used for sensors that require (5V) power or additional sensor
modules. The auxiliary input is a 5 pin connector. See list of
compatible sensors on the website www.mindmedia.com .
mportant
•Note the difference in number of pins of the different inputs.
•The orientation of the connector is marked with a red dot on both
device connector and accessories. Make sure the dots are aligned
before plugging the cable in the device.
•Do not rotate the connector during insertion of the cable.
3.6 Device label
The device label can be found at the bottom of the device. It contains the REF code, Serial Number,
power requirements and other properties of the device. Use the REF number and-or serial number
(SN) to look up the channel specifications as listed in chapter 8

11
4nstructions for use
4.1 Software
Software, that is needed to use the product, is supplied to you by email as download or by one or
more CDs in the package. It is recommended to download the most up-to-date software via
www.mindmedia.com. Once installed and activated, this step can be skipped.
PC requirements
Hardware
•Processor: > 1 GHz
•RAM: > 1 GB
•HDD: > 50 GB (> 250 GB recommended)
•Internet connection or CD/DVD Drive
Operating system
Windows
•Windows 10 (6 -bit)
•Windows 8.1 (6 -bit)
•Windows 7 (32-bit / 6 -bit)
mportant
Disconnect all Mind Media products from the PC before installing any Mind
Media software.
It is recommended to uninstall older versions of the driver before installing
new drivers.
Mind Media PC Driver
Start the installer by executing setup.exe . The Mind Media PC-Driver Setup Wizard starts and guides
you through the process of installation of the driver. Follow the steps on screen.

12
4.2 Powering the NeXus-4
The NeXus- can be powered using batteries. Follow the steps below to insert batteries.
Steps to in insert batteries.
Remove the battery cover by
sliding it in the direction of the
arrow
nsert batteries. Note the
orientation.
Close the battery cover
mportant
•Mind Media strongly recommends high quality AA batteries (for
example Duracell Procell) in order to have optimal performance.
•Do not use batteries that contain lithium.
•Do not use rechargeable batteries.
Power Saving Mode
When the device is not in use (e.g. there is no active connection (pairing) with the PC), the NeXus-
will switch off after 5 minutes to save its power.
4.3 Transfer data to PC
Bluetooth IT-network connections are supported by the product. The purpose of the IT-network
connection is for device control and/or data transfer. The intended information flow is:
•Control from a PC to the device
•Raw data from the device to the PC
The supported versions of the IT network connections are:
•Bluetooth: 1.1 and higher
The following section describe the installation of the Bluetooth IT-network connection.
Please note: No hazardous situations have been identified for the product due to loss of the IT-
network functionality.

13
Wireless transmission: Bluetooth interface
1. Insert the Bluetooth dongle in a USB port. Wait for Windows Update to install the drivers for
the Bluetooth dongle.
2. After Windows has finished installing the Bluetooth drivers, click the Bluetooth tray icon in
the right bottom corner of the Windows taskbar.
3. Click, ‘Add a device’. If you do not see the Bluetooth tray icon, click
Start > Devices and Printers > Add a device
. Windows will start scanning the environment. Make sure the
NeXus- is powered on. The NeXus- should automatically show
up in the list.
5. Select the device and click ‘Next’. Windows will ask for a pairing
code. The pairing code consists of the last four digits of the serial
number. The serial number can be found on the back of the NeXus- on the silver label
next to ‘SN’. Click Next to finish the Bluetooth setup.
6. Windows may report that drivers are being installed. Wait until Windows reports that the
‘Device is ready to use’.
The Bluetooth pairing remains valid until you plug the Bluetooth dongle into a
different USB port, delete the link from Windows, or pair the device with
another PC.
4.4 Perform measurement
Connect Patient Leads
Connect the Patient Ground lead to the GND input of the amplifier and to the patient. Use the Mind
Media Patient Ground wristband for optimal contact. Wet the band and place it around your wrist.
Mind Media recommends using the wet wristband to optimize measurement
setup. This will improve the signal quality. Please read the Application Note on
the reference amplifier for more background.
Connect all patient leads and patient ground. Please refer to instructions for use of the accessories
and sensors for more information.
4.5 Mobility
Mind Media recommends using the carrying bag in case the patient needs to carry the device during
the measurement. Slide the device in the carrying bag. This may require some force. The elastic
bands hold the device in place. The carrying bag can be attached to a belt or use a shoulder band.

1
5Operational principles
5.1 Bipolar input channels
The input stage for measuring bipolar electrophysiological signals is configured as an
instrumentation amplifier. The difference between a ‘plus’ and ‘minus’ signal is amplified. The
patient ground electrode is required to keep patient potential and amplifier potential at about the
same level.
All electrode cables are shielded with the average of the ‘plus’ and ‘minus’ electrode signal (active
shielding). The active shielding ensures that disturbances such as cable movement artifacts and
mains interference (50/60 Hz) are reduced to a minimum.
After the first amplifier stage (gain = 20) the signals go directly to the ADC. No high pass or low pass
filters that can cause signal phase shifts or filter overflows are present.
The NeXus- has one dual bipolar input. This connector leads to two bipolar input stages for in total
two differential channels.
5.2 Auxiliary input channel
The Auxiliary input has a 5-pin connector. Signals on this connector are +5V output, -5V output,
GND, +signal input and -signal input. The +5V/-5V/GND pins can be used to power an active sensor.
The + and - inputs are connected to an instrumentation amplifier with a gain of 1. The output of the
amplifier goes to the ADCs without any filtering.
5.3 Filtering
The ADC of the device has a digital sinc filter with a cutoff frequency of 0.2 * sample frequency.
Supported sampling rates are defined in chapter 8. There is a 1
st
order low pass filter before the ADC
with a -3db point at 08Hz.
Besides above no other filtering is applied.

15
6Maintenance
The product does not contain user serviceable parts. Maintenance is limited to regular cleaning.
Repairs can only be performed by the manufacturer, contact [e-mail] in case the
product needs to be repaired. Mind Media Support staff will determine whether a repair is required
and possible.
The product does not require regular servicing or re-calibration during its expected service life of 10
years. If the product is intended to be used after its expected service life, contact Mind Media to
have the product inspected before continued use.
Cleaning
•Before cleaning, make sure the equipment is switched off and not in contact with a patient.
•Use only tap water, if necessary with a mild detergent, applied through a soft damp cloth.
•Do not spill fluids or submerge product in liquids.
•Never use sharp tools or aggressive chemicals for cleaning or disinfecting.
•Do not sterilize equipment.
Environmental protection
Special EU instructions for disposal are applicable to a product on which this
symbol is placed. These instructions apply to all parts of the equipment.
When the product has reached End of Life, it must not be disposed of with
other waste. Instead, it is the user’s responsibility to dispose of their waste
equipment by handing it over to a designated collection point for the recycling
of waste electrical and electronic equipment.
The separate collection and recycling of your 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 more information about where you can dispose of your waste equipment
for recycling, please contact your local city office, your household waste
disposal service, or Mind Media.

16
7Electromagnetic guidance
Portable and mobile RF communications equipment can affect the system. The system needs special
precautions regarding EMC and must be installed and put into service according to the EMC
information outlined below.
Guidance and manufacturer’s declaration - electromagnetic emissions
The NeXus- is intended for use in the electromagnetic environment specified below. The customer or the user of the
NeXus- should assure that it is used in such an environment.
Emission test Compliance Electromagnetic environment - guidance
RF emissions CISPR 11
Group 1
The NeXus- uses RF energy only for its internal
function. Therefore, its RF emissions are very
low and are not likely to cause any interference
in nearby electronic equipment.
RF emissions CISPR 11
Class B
The NeXus- is suitable for use in all
establishments, including domestic
establishments 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
Not applicable
Battery powered
equipment
Voltage fluctuations/flicker emissions
61000-3-3
Not applicable
Battery powered
equipment
Guidance and manufacturer’s declaration - electromagnetic immunity
The NeXus- is intended for use in the electromagnetic environment specified below. The customer or the user of the
NeXus- should assure that it is used in such an environment.
mmunity test EC 60601 test level Compliance level Electromagnetic environment - guidance
Electrostatic
discharge (ESD)
IEC 61000- -2
±6 kV contact
±8 kV air
±
8
kV contact
± 8 kV air
Floors should be wood, concrete, or ceramic
tile. If floors are covered with synthetic
material, the relative humidity should be at
least 30 %.
Electrical fast
transient/burst
IEC 61000- -
±2 kV for power
supply lines
±1 kV for
input/output lines
Not applicable
Battery powered
equipment
Not applicable
cabling shorter than
3m
Surge
IEC 61000- -5
±1 kV line(s) to line(s)
±2 kV line(s) to earth
Not applicable
Battery powered
equipment
Not applicable
Battery powered
equipment

17
Guidance and manufacturer’s declaration - electromagnetic immunity
The NeXus- is intended for use in the electromagnetic environment specified below. The customer or the user of the
NeXus- should assure that it is used in such an environment.
mmunity test EC 60601 test level Compliance level Electromagnetic environment - guidance
Voltage dips, short
interruptions and
voltage variations on
power supply input
lines IEC 61000- -11
<5 % U
T
(>95 % dip in U
T
)
for 0,5 cycle
0 % U
T
(60 % dip in U
T
)
for 5 cycles
70 % U
T
(30 % dip in U
T
)
for 25 cycles
<5 % U
T
(>95 % dip in U
T
)
for 5 s
Not applicable
Battery powered
equipment
Not applicable
Battery powered
equipment
Not applicable
Battery powered
equipment
Not applicable
Battery powered
equipment
Power frequency
(50/60 Hz) magnetic
field IEC 61000- -8
3 A/m
3 A/m
Power frequency magnetic fields should be at
levels characteristic of a typical location in a
typical commercial or hospital environment.
NOTE U
T
is the a.c. mains voltage prior to appli
cation of the test level.
Guidance and manufacturer’s declaration – electromagnetic immunity
The NeXus- is intended for use in the electromagnetic environment specified below. The customer or the user of the
NeXus- should assure that it is used in such an environment.
mmunity
test
EC 60601 test
level
Compliance
level
Electromagnetic environment - guidance
Portable and mobile RF communications equipment should be
used no closer to any part of the NeXus- , including cables, than
the recommended separation distance calculated from the
equation applicable to the frequency of the transmitter.
Recommended separation distance:
Conducted RF
IEC 61000- -6
3 Vrms
150 kHz to 80 MHz
3
V


1
.
2
√

Radiated RF
IEC 61000- -3
3 V/m
80 MHz to 2.5 GHz
3
V/m


1
.
2
√


80 MHz to 800 MHz
  2.3√ 800 MHz to 2.5 GHz
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 site survey,
a
should be less than the compliance
level in each frequency range.
b
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.
a
Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile

18
Guidance and manufacturer’s declaration – electromagnetic immunity
The NeXus- is intended for use in the electromagnetic environment specified below. The customer or the user of the
NeXus- should assure that it is used in such an environment.
mmunity
test
EC 60601 test
level
Compliance
level
Electromagnetic environment - guidance
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 NeXus- is used exceeds the applicable RF
compliance level above, the NeXus- should be observed to verify normal operation. If abnormal performance is
observed, additional measures may be necessary, such as re-orienting or relocating the NeXus- .
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Recommended separation distances between portable and mobile RF communications equipment and the
NeXus-4
The NeXus- is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The
customer or the user of the NeXus- can help prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF communications equipment (transmitters) and the NeXus- as recommended below,
according to the maximum output power of the communications equipment.
Rated maximum output
power of transmitter
W
Separation distance according to frequency of transmitter
m
150 kHz to 80 MHz


1
.
2
√

80 MHz to 800 MHz


1
.
2
√

800 MHz to 2.5 GHz


2
.
3
√

0.01
0.12
0.12
0.23
0.1
0.38
0.38
0.73
1
1.2
1.2
2.3
10
3.8
3.8
7.3
100
12
12
23
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in meters (m)
can be estimated using the equation applicable to the frequency of the transmitter, where P is the maximum output power
rating of the transmitter in watts (W) according to the transmitter manufacturer.
NOTE 1 At 80 MHz and 800 MHz, the separation distance for 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.
The NeXus- has no essential performance.

19
8Technical specifications
General Specifications
Type NeXus-
TMS codes / REFs 95-093 -00 -0
Size (device only) 112 mm x 66 mm x 28 mm (l x b x h)
Weight (g) 130 g (177 g incl. batteries)
Regulatory Specifications
MDD class (Annex X) IIa
Power source Batteries
Electric shock
protection
Applied parts: Class CF
Applied parts •Its enclosure, also after removal of battery cover including all
contacts and receptacles
•The patient accessories.
Accessible parts Apart from the applied parts the NeXus- has no accessible parts.
Software class per EC
62304
A
ngress protection Main unit: IP20
Bipolar nputs (EEG, ECG, EOG, EMG, etc.)
Noise < 1.5 µV rms (@ Fs = 102 Hz)
Gain 19.5 x
nput signal difference -100mV to +100mV
nput common mode range -2V to +2V
nput impedance > 10
10
Ω
CMRR > 100 dB
Connector LEMO 0B series 6 pin

20
Auxiliary nputs
Noise < 15 µV rms (@ Fs = 512 Hz)
Gain 1 x
nput signal difference -2V to +2V
nput common mode range -2V to +2V
nput impedance > 10
10
Ω
CMRR > 70 dB
Connector LEMO 0B series 5 pin
Filtering
High pass None
Low pass Digital FIR filter in ADC;
cutoff frequency = 0.2 * sample frequency
Battery
Batteries 2 x AA disposable alkaline 1.5V
Power Saving 5 minutes without connection to PC
Battery low
indication level 2.0 V ± 0.1V
Battery empty shut
down level 1.7 V ± 0.1V
Bluetooth Communication
Bluetooth 1.1 class 2
Profile Serial port profile
Range 10 meters (line of sight)
Baud rate 230 00 bps
Transportation Conditions
Temperature -25°C to +70°C
Humidity 15% to 93%
Pressure 500 hPa to 1060 hPa
Storage Conditions
Temperature 0°C to + 0°C
Humidity 15% to 93%
Pressure 500 hPa to 1060 hPa