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NM20216A-F

Technical data

1.3.7.

EEG main electronics

• Signal acquisition module (SAM) for 12 channels

• one digital signal processor (DSP) per SAM

• Resolution of A/D conversion: 16 bits

• Type of coupling: dc

• Input stage realized with instrumentation amplifiers with software

controlled gain of 1 or 10, corresponding to SAM input ranges of

10 V or

1 V, respectively

• All conversions started simultaneously, synchronized with MEG

channels

• Sampling rate equivalent to that of MEG channels

• Low-pass filters identical to those in MEG channels (DSP-based)

• 2 SAM / remote processor unit (RPU)

• Connected over dedicated Ethernet to parallel real-time data acquisi-

tion computers. Accessible also through workstations.

• SAM boards reside in the EEG rack inside themain electronics cabinet

• Number of subracks: 1

• Number of SAM boards: 6 (64 ch.) / 12 (128 ch.)

• Powering: Separate power supply for each set of four slots inside the

main electronics cabinet

• Fan unit: mains operated.

1.4.

MEG and EEG Power Supplies

1.4.1.

Front-end MEG power supply

• Power rating: 400 W

• Mains: 230 V~, 47…63 Hz, from a dedicated isolation transformer

• Control: manual power switch

• Number of units: 1

• Output:

15,5 V

9 A (analog), 24V~ 4 A (for isolated EEG), +6,3 V

8 A (digital)

• Output cabling to the filter unit

• Primary fuses: 3.15 A slow blow

• Feeds also the non-isolated part of the EEG system

• Overload protection: current-limiting circuit

• Location: inside main electronics cabinet

Содержание Neuromag

Страница 1: ...Elekta Neuromag System Hardware Technical manual Revision F September 2005 Elekta Neuromag...

Страница 2: ...y assumes no liability for damage and or failure of equipment caused by faulty site preparation Elekta Neuromag is a trademark of Elekta The system has been marketed and sold previously under the name...

Страница 3: ...MEG power supply 15 1 4 2 Front end EEG power supply isolated 16 1 4 3 MEG and EEG electronics power supply unit 16 1 4 4 Real time data acquisition computer power supply 16 1 4 5 Main iIsolation tra...

Страница 4: ...osal 30 Chapter 2 Dimensions and weights 31 2 1 Dewar dimensions 31 2 2 Gantry and chair dimensions 33 2 3 Dimensions of cabinets 35 2 4 Table of dimensions and weights 36 Chapter 3 Diagrams 37 3 1 El...

Страница 5: ...The applied parts parts in direct contact with the person being investigated with the system and the type plate are marked with this symbol to indicate that they fulfill the leakage current requiremen...

Страница 6: ...6 NM20216A F...

Страница 7: ...he outside helmet surface of the dewar average 18 mm Material and construction of dc SQUIDs all refractory thin film structures on silicon Average triple sensor unit spacing 34 mm Size of gradiometers...

Страница 8: ...the top of the wiring unit where the components for the dc SQUID gain control reside Connection wiring flexible cable assembly from the printed circuit boards to the top flange Top flange preamplifie...

Страница 9: ...helmet tilted 30 from vertical supine helmet tilted 180 from vertical Dewar movements Two fixed positions User controlled up and down buttons and manual latch bar Movement mechanism Motor driven rope...

Страница 10: ...le 1 3 MEG and EEG Electronics 1 3 1 General The MEG electronics can be divided in the following blocks Preamplifiers inside of the probe unit Feedthrough RF filters inside the filter unit Control pow...

Страница 11: ...ne First 32 channels are always connected as unipolar also referred as single ended using common buffered reference from reference electrode connected to minus input of the preamplifier Each following...

Страница 12: ...ated for is 160 mV Leakage currents comply with class BF body floating devices according to IEC60601 1 Buffered reference input Active grounding at frequencies greater than 5 Hz for increased common m...

Страница 13: ...powered from an isolated power supply Circuitsoutsideoptoisolationpoweredfromcontrol nonisolatedpower feedthrough filter grounded Fixed gain of 5 0 Cut off frequency 3 dB point 13 kHz Input range of l...

Страница 14: ...via DSP Cutoffoflow passfilter adjustable predefinedvalues150 Hz 3 3 kHz Connected over dedicated Ethernet to parallel real time data acquisi tion computers Accessible also through workstations SQC bo...

Страница 15: ...d Ethernet to parallel real time data acquisi tion computers Accessible also through workstations SAMboardsresideintheEEGrackinsidethemainelectronicscabinet Number of subracks 1 Number of SAM boards 6...

Страница 16: ...7 MEG 2 64 ch EEG or 4 128 ch EEG Output 15 5 V 0 8 A analog 6 3 V 1 2A 6 3 V 1 6 A analog 5 V 4 A digital Output cabling internal directly to backplane Primary fuses 230 V 0 63 A slow blow Overload a...

Страница 17: ...onics Cabinet 1 5 1 Filter unit cabinet RF filter cutoff for all signals 130 kHz 20 dB octave Maximum signal levels to any feedthrough input output 15 V Dimensions and weights see chapter 2 1 5 2 MEG...

Страница 18: ...nsmitter and receiver Specifications see Polhemus Fastrak User s Manual Non magnetic goggles with an additional receiver for movement correction Separate portable medical isolation transformer 650 VA...

Страница 19: ...ndicator light Max current of the outlet sockets 10 A in total Mains power via an isolation transformer see 1 4 5 permanently installed Auxiliary feedthrough filters BNC 1 2 XLR NC connectors 1 2 20 d...

Страница 20: ...ra mounted on shielded room wall Color monitor 1 7 Data Acquisition System Hardware 1 7 1 Real time data acquisition computer system Real time computer Motorola PowerPC based system Number of real tim...

Страница 21: ...1 M without pull up Pull up loop current 500 A Input mode single ended Optically isolated from main electronics Delay from interface unit to trigger acquisition less than 50 s Minimum detectable puls...

Страница 22: ...exible siphon 2 filter cartridges Flexible siphon extension tube Cryogenics kit Transfer exhaust hose silicon with hose clamp Pressurizing unit 1 10 Environmental and power requirements grounding Temp...

Страница 23: ...ator typ 10 Audiovisual stimulus system typ 200 Feed forward active compensation 200 Note 1 Stimulus cabinet not included as a unit since the consumption depends on the equipment used Note 2 Ratings m...

Страница 24: ...urements Finger response pad Additional workstation analysis EEG extension to 128 channels DACQ sampling rate upgrade Electrical stimulator DAT drive for backup Magneto optical disk drive Additional h...

Страница 25: ...mmunity over the entire frequency range 80 MHz to 2 5 GHz The system has been tested of RF immunity onlyatselectedfrequenciesusingconductedRFcurrent injectedfroman RF generator whose output is 80 ampl...

Страница 26: ...t verified not to affect system performance may be used A notice concerning this should be posted at the entrance of the magnetically shielded room Guidance and manufacturer s declaration electromagne...

Страница 27: ...000 4 5 1 kV differential mode 2 kV common mode 1 kV differential mode 2 kV common mode Mains power quality should be that of a typical commercial or hospital environment Voltage dips short interrupti...

Страница 28: ...res 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 vici...

Страница 29: ...ximum output power of transmitter W Separation distance according to frequency of transmitter m 150 kHz to 80 MHz 1 2 P 80 MHz to 800 MHz 1 2 P 800 MHz to 2 5 GHz 2 3 P 0 01 0 12 0 12 0 23 0 1 0 38 0...

Страница 30: ...rnational regulations and laws Materials hazardous to health and the environment must be separately removed and disposed of through competent licensed facil ities The remaining material should be recy...

Страница 31: ...NM20216A F 31 CHAPTER 2 Dimensions and weights 2 1 Dewar dimensions 630 1080 1100 Figure 2 1 Dewar side view Dimensions in millimeters 2...

Страница 32: ...32 NM20216A F 2 Dimensions and weights Figure 2 2 Dewar front view Dimensions in millimeters 1100 630...

Страница 33: ...20216A F 33 Dimensions and weights 2 2 2 Gantry and chair dimensions Figure 2 3 Gantry in upright measurement position Dimensions in millimeters 620 690 950 1172 1813 1206 9 9 5 775 1057 1984 2220 114...

Страница 34: ...34 NM20216A F 2 Dimensions and weights Figure 2 4 Gantry in supine position Dimensions in millimeters 1984 1984 725 756 725 602 500 500 603 1206 2000 155 510 640 690 740 950...

Страница 35: ...Figure 2 5 Electronics and stimulus cabinet dimensions in millimeters For heights see section 2 4 Figure 2 6 Filter cabinet dimensions 1400 400 1000 Adjustable 100 min 500 max 800 930 600 2040 90 95 M...

Страница 36: ...s chair 70 135 78 80 Filter unit cabinet adjustable 100 40 150 190 150 Electronics cabinet 60 80 212 250 Stimulus cabinet 60 80 202 100 Acq workstation typ 70 75 68 25 Analysis workstation typ 70 75 6...

Страница 37: ...al proc Digital signal proc Stim trigger I F Ethernet System bus Ethernet System bus Ethernet Ethernet switch System bus Real time computers VMEbus Subject B B Head position indicator coils Quality as...

Страница 38: ...Feedthrough filter Feedthrough filter EEG electronics EEG Preamplifier Feedthrough filter opto isolation LHe HPI Control Unit SQUID Sensor EEG Electrode Liquid Helium probe SQUID Preamplifier Bus Bus...

Страница 39: ...ink Isolated power supply Safety isolating transformer RF feedthr filter 24 V 15 V 6 V 230 V Isolated gnd 12 Vi Unipolar channels Test oscillator G Differential amplifier Buffer ampl dc high pass Dc o...

Страница 40: ...EG optoisolation signal feedthrough filter 4 pcs 16 channels unit EEG Ch 1 64 to Signal Acquistion Module Isolated power EEG feedthrough filter 24 V Isolated floating 12V Non isolated 15V EEG Ch 65 12...

Страница 41: ...em pera ture gauge Aux board in Gantry Ga Gd Serial bus HPI coils MUX Dipoles Dc power Dc power Dc power DVM maintenance Patient Stimulation stereo Intercom microphone Intercom loudspeaker Assistant P...

Страница 42: ...t yellow Fault red Indicator display Pushbutton DOWN Pushbutton UP Feedthrough filter Lifting mechanism indicator feedthrough assy Outer side Inner side V Out Gnd SX1 Upper limit no reflection light o...

Страница 43: ...o MEG preamplifiers Analog signals from to MEG preamplifiers EEG 64 128 ch Analog signals from EEG preamplifiers Ethernet To acquisition workstation Main MEG electronics rack Preamplifier power supply...

Страница 44: ...4 x Circuit breaker EMC filter Main switch with power failure release Mains sockets Roof fan Ethernet switch Auxiliary sockets Mains sockets Main DSP electronics Mains socket RT computers Mains socke...

Страница 45: ...3 2 2 Stimulus cabinet Figure 3 8 Stimulus cabinet side view side facing the magnetically shielded room Stimulus cabinet Mains line RF filter Auxiliary feedthrough Signal feedthroughs Mains line powe...

Страница 46: ...a Stimulus cabinet s auxiliary signal feedthrough connectors For specifications of the feedthrough filters see 1 6 96 BNC 1 BNC 2 low frequency feedthroughs XLR 1 XLR 2 low frequency feedthroughs BNC...

Страница 47: ...Vd Vd Gd Gd 230V Gd Vd Gd 6V 8A Vd Gd Vp System grounding point Vc Vc 230V Gp Gc Main switch of the cabinet Va Ga Va Ga Gd Ga 15V 9A 230V Va G Va Va Va Va Vm Gm Gm Vm 120V 115V 100V Front end EEG powe...

Страница 48: ...F7 F8 1 1 T2 RF Filter Stimulus cabinet Sockets L1 L2 PE Main electronics cabinet Sockets System grounding point L N PE MAINS Grounding terminal in the transformer room S6 S7 RF Filter L L1 0 L2 N S4...

Страница 49: ...and sensor array Figure 3 12 b Triple sensor element chip Figure 3 12 a Sensor array Dimensions in millimeters Detector array right frontal view Detector array side view Average distance between sens...

Страница 50: ...yogenic insert Figure 3 14 Close up of the insert inside the Dewar see also Fig 3 13 Figure 3 13 Cross section of the Dewar see also Fig 3 14 wiring unit support tube flexible cable assembly neck plug...

Страница 51: ...logger Data Acquisition System Software Structure Network TCP IP connections MEG preamp control MEG EEG signals from RPU s DSP control EEG preamp control Online averager Raw data display Raw data logg...

Страница 52: ......

Страница 53: ...NM20216A F 53 Appendix Additional site specific data sheets if applicable...

Страница 54: ...Elekta Neuromag Oy P O Box 68 FIN 00511 Helsinki Finland Tel 358 9 756 2400 Fax 358 9 756 24011 E mail neuromag neuromag fi Web www neuromag com...

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