BRAINTRONICS BRAINBOX EEG-1142 User manual

BRAINBOX®EEG-1142
BRAINTRONICS B.V.
Gildemark 130
1351 HL ALMERE
The Netherlands
Phone : [phone]
Fax.: [phone]
Internet: http://www.braintronics.nl
email: [e-mail]
File name 860150 V1.10.doc
USERS MANUAL
EEG AMPLIFIER FOR EPILEPSY MONITORING
BRAINBOX®EEG-1142

USERS MANUAL BRAINBOX®EEG-1142 Rev. 1.10 Publ. 860150
BRAINTRONICS B.V Gildemark 130 1351 HL ALMERE THE NETHERLANDS
Phone [phone]Fax: [phone] email: [e-mail] internet: http://www.braintronics.nl Page 2 of 47
File name: 860150 V1.10.doc
Table of contents
Chapter Description Page
1GENERAL .........................................................................................5
1.1 Point of attention.............................................................................................................5
1.2 Introduction.....................................................................................................................5
1.3 Features.........................................................................................................................6
1.4 References.....................................................................................................................7
1.5 Guarantee ......................................................................................................................8
1.6 Document status.............................................................................................................8
2SAFETY ASPECTS...........................................................................9
2.1 General warnings ...........................................................................................................9
2.2 Symbols .........................................................................................................................9
2.3 Maintenance.................................................................................................................11
2.3.1 Cleaning of the instrument............................................................................................11
2.3.2 Repair and Modification................................................................................................11
2.4 Handling precautions....................................................................................................11
2.5 Operator skills ..............................................................................................................11
2.5.1 Operator Profile............................................................................................................12
2.6 Connections .................................................................................................................13
2.6.1 General information regarding mating of connectors ....................................................13
2.6.2 Power supply for the BRAINBOX®EEG-1142 .............................................................13
2.6.3 Ground connections .....................................................................................................14
2.6.4 Connection to other equipment.....................................................................................14
2.6.5 Restriction of use of the BRAINBOX®ETHERNET SYSTEM .......................................15
2.6.6 Cables..........................................................................................................................15
2.7 Environment.................................................................................................................15
2.7.1 Patient environment and applied part ...........................................................................16
2.8 End of life disposal .......................................................................................................17
3PLACE IN SYSTEM.........................................................................18
3.1 BRAINBOX®ETHERNET SYSTEM overview..............................................................18
3.2 System Features using the BRAINBOX®EEG-1142....................................................19
3.3 System input using the BRAINBOX®EEG-1142..........................................................20
3.4 Parts to use with BRAINBOX®EEG-1142....................................................................20
3.4.1 Touchproof input boxes................................................................................................ 20
3.5 Ground Reference Electrode........................................................................................21
3.6 Input Protection ............................................................................................................21
3.7 Operating modes..........................................................................................................21
3.7.1 EEG mode....................................................................................................................22
3.7.2 CAL mode ....................................................................................................................22
3.7.3 KOHM mode................................................................................................................. 24
3.7.4 System Characteristics mode (firmware V0.2 and higher) ............................................24
4SPECIFICATIONS...........................................................................25
4.1 General ........................................................................................................................25
4.2 Safety...........................................................................................................................25
4.2.1 Safety provided by the total BRAINBOX®ETHERNET SYSTEM .................................25
4.2.2 Safety provided by BRAINBOX®EEG-1142 ................................................................25
4.3 EMI Protection..............................................................................................................25

USERS MANUAL BRAINBOX®EEG-1142 Rev. 1.10 Publ. 860150
BRAINTRONICS B.V Gildemark 130 1351 HL ALMERE THE NETHERLANDS
Phone [phone]Fax: [phone] email: [e-mail] internet: http://www.braintronics.nl Page 3 of 47
File name: 860150 V1.10.doc
4.4 Inputs ...........................................................................................................................26
4.5 Calibration (For high accuracy see par. 4.9).................................................................26
4.6 Electrode check............................................................................................................27
4.7 Continuous KOhm range output ...................................................................................27
4.8 EEG Amplifiers (For high accuracy see par. 4.9)..........................................................27
4.9 High accuracy EEG channels....................................................................................... 28
4.10 CMRR, practical Common Mode Rejection Ratio .........................................................28
4.11 A/D Conversion EEG channels..................................................................................... 29
4.12 Digital FIR filter EEG channels .....................................................................................29
4.13 DC Amplifiers ...............................................................................................................29
4.14 A/D Conversion DC channels....................................................................................... 30
4.15 Interface (BRAINBUS)..................................................................................................30
4.16 System characteristics..................................................................................................30
4.17 Electromagnetic compatibility .......................................................................................31
4.18 Environment.................................................................................................................31
5CONNECTIONS..............................................................................32
5.1 EEG-signal inputs and GND references .......................................................................32
5.2 SpO2 and EVENT input................................................................................................33
5.2.1 SpO2 and EVENT output..............................................................................................34
5.3 BRAINBUS...................................................................................................................34
5.4 BRAINBUS Terminating Connector..............................................................................35
6DIRECTIONS FOR SOFTWARE DEVELOPMENT .........................36
6.1 Control code................................................................................................................. 36
6.2 Calibration Mode ..........................................................................................................37
6.3 EEG Mode....................................................................................................................38
6.4 Electrode Impedance Check.........................................................................................38
6.5 Channel definition.........................................................................................................40
7GUIDANCE ON ELECTROMAGNETIC COMPATIBILITY...............41
7.1 Guidance and manufacturers declaration .....................................................................41
7.1.1 Electromagnetic emissions...........................................................................................41
7.1.2 Electromagnetic immunity.............................................................................................42
7.2 General guidelines to avoid EMC problems..................................................................44
7.2.1 Disturbance caused by 50/60 Hz. mains voltage ..........................................................44
7.2.2 Precautions to prevent electromagnetic disturbances...................................................44
7.2.3 What to do if you need to make an EEG in a bad environment.....................................45
Appendix A. Characteristics of Digital FIR filter in all BRAINBOX®amplifiers............................. 46

USERS MANUAL BRAINBOX®EEG-1142 Rev. 1.10 Publ. 860150
BRAINTRONICS B.V Gildemark 130 1351 HL ALMERE THE NETHERLANDS
Phone [phone]Fax: [phone] email: [e-mail] internet: http://www.braintronics.nl Page 4 of 47
File name: 860150 V1.10.doc
Table of figures
Figure Description Page
Figure 1: Patient environment. ........................................................................................................................ 16
Figure 2: General block diagram BRAINBOX®ETHERNET SYSTEM........................................................... 18
Figure 3: Internal functions of System Components for 1 amplifier system.................................................... 19
Figure 4: Photo of BRAINBOX®EEG-1142 with INBOX-1142....................................................................... 20
Figure 5: Level CAL step response of EEG amplifier...................................................................................... 23
Figure 6: Overshoot on Level CAL signal........................................................................................................ 23
Figure 7: BRAINBOX®EEG-1142 EEG electrode connector......................................................................... 33
Figure 8: BRAINBOX®EEG-1142 EVENT, SpO2 and BRAINBUS connectors............................................ 33
Figure 9: SpO2 and EVENT inputs seen form outside.................................................................................... 34
Figure 10: BRAINBUS connectors seen from outside.................................................................................... 34
Figure 11: Diagram of the Impedance test signal............................................................................................ 39
Figure 12: Frequency vs. Gain response of analog input plus AA filter and digital filter................................. 47
Table of tables
Table Description Page
Table 1: Electrode input connector pin description ......................................................................................... 32
Table 2: Connector layout EVENT connector.................................................................................................. 33
Table 3: Connector layout SpO2 connector. ................................................................................................... 33
Table 4: Connector layout BRAINBUS. .......................................................................................................... 34
Table 5: BRAINBUS Terminating Connector.................................................................................................. 35
Table 6: Control Bytes for the BRAINBOX®EEG-1142 amplifier................................................................... 36
Table 7: Mode bits definitions.......................................................................................................................... 37
Table 8: Values of Electrode Test Level.......................................................................................................... 37
Table 9: Values of Amplifier Test Level........................................................................................................... 37
BRAINBOX®is a registered trademark of BRAINTRONICS.

USERS MANUAL BRAINBOX®EEG-1142 Rev. 1.10 Publ. 860150
BRAINTRONICS B.V Gildemark 130 1351 HL ALMERE THE NETHERLANDS
Phone [phone]Fax: [phone] email: [e-mail] internet: http://www.braintronics.nl Page 5 of 47
File name: 860150 V1.10.doc
1 GENERAL
1.1 Point of attention
The BRAINBOX® EEG-1142 is always to be used in combination with other Braintronics equipment to form a
BRAINBOX® ETHERNET SYSTEM. This cannot act as a complete EEG system, and always has to be used
with a PC with EEG analysis software not delivered by Braintronics BV, this manual is written from the
perspective of the System Integrator. The System Integrator therefore has to include all information needed
by the End User in his own user manuals. Special attention has to be given to all safety aspects and EMC
requirements included in this manual. Also see paragraph 1.4 for references to other manuals to be used for
system configuration, installation and software development.
1.2 Introduction
THE PERFECT FRONT END FOR EPILEPSY MONITORING
The BRAINBOX®EEG-1142 is part of a family of EEG amplifiers all having their own specific area of
application. The BRAINBOX®EEG-1142 amplifier is the perfect choice as front-end for computer based
small EEG systems, especially for ambulatory monitoring of epilepsy patients and polysomnography. The
system is designed for OEM users who market EEG analysis software and need an EEG amplifier front-end
to complete the EEG system. Braintronics can supply all BRAINBOX®equipment with a customized text
plate with name and logo’s as required.
HIGH END PERFORMANCE
The BRAINBOX®EEG-1142 is always to be used with a PC and EEG analysis software which are not
delivered by Braintronics BV. For interfacing to a standard Ethernet 10/100 Mbit LAN, Braintronics BV
delivers the ETHERNET-102 interface. For isolation Braintronics BV delivers the ISO-101. These system
parts together with all necessary cables form the BRAINBOX®ETHERNET SYSTEM. Additional to the
excellent performance of the EEG amplifier, the BRAINBOX®ETHERNET SYSTEM brings you features not
easily found in such a very compact system: Real Input Calibration, Electrode Impedance Check, excellent
digital filtering and anti aliasing of –40 dB at ½ sample rate. The small amplifier box with its thin flexible cable
makes it easy for the patient to move around freely during long term monitoring.
16 BIT AD CONVERTER BUILT IN
The BRAINBOX®EEG-1142 uses a 16 bit AD Converter for each EEG-channel. Assuring high quality
parallel sampling for all channels at the same time to prevent phase shifts between channels. The sample
rate of the ADC is 32768 Hz for the EEG channels of a BRAINBOX®amplifier, a 32x over sampling. DC
channels are sampled at a high 1024 Hz rate. In a daisy chained system simultaneous sampling of all
channels is also maintained.
LOW SENSITIVITY TO NOISE
Thanks to its high input isolation, the BRAINBOX®amplifiers are extremely insensitive to noisy
environments. The floating inputs give a very high rejection against common mode signals like 50/60 Hz.
interference. To further reduce 50/60 Hz interference under difficult noise situations, an active common mode
suppression system (G1/G2) is available.
FAST RECOVERY
The EEG amplifiers in the BRAINBOX®EEG-1142 are designed to have a fast recovery time when the
electrodes are first connected and also when disturbances occur due to electrode movement.
INPUT ISOLATION
The ultra portable BRAINBOX®EEG-1142 amplifiers do not have input isolation themselves. The isolation of
the total system is performed by the ISO-101. Total input isolation is according to EN60601-1, class II, and
type CF.
EMC PROTECTION
All parts of the BRAINBOX®EEG-1142 are shielded inside, all inputs are filtered for high frequency
interference and all inputs have a protection circuit against electrostatic discharge (ESD).