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Datex-Ohmeda S/5 M-EEG, Technical Reference Manual Slot

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Datex-Ohmeda S/5 M-EEG Technical Reference Manual Slot Download Page 10

Datex-Ohmeda S/5 monitors

Document No. 800 1011-1

6

Audio
generator

Audio level
adjustment

Timing
control

PWM

H83048

CTRL

Earphones

Headbox

Figure 3

Audio stimulator circuitry

2.2.2

 

Headbox board

The Headbox board consists of the following functional sections:

•

 

input protection

•

 

EEG amplifiers and filters

•

 

FEMG amplifier and filter

•

 

current feeding circuitry and amplifiers for impedance measurement

•

 

microprocessor

•

 

serial communication

RS

422

driver

Data

AEP stimulus

Impedance 

check

EEG
signal

1-4

1-4

A
/
D

AEP 
stimulus

1

p
a
t
i
e
n
t

+15 V

CPU

3048

    

     

    

Is

ol

at

io

n  

   k

V

Opto

Isolation

Power

supply

Headbox

Keys

±5 V

±12V

Figure 4

EEG headbox board block diagram

Summary of Contents for S/5 M-EEG

Page 1: ...out notice Document No 800 1011 1 June 2001 Datex Ohmeda Inc 3030 Ohmeda Drive 53707 7550 MADISON WIS USA Tel 1 608 221 1551 Fax 1 608 222 9147 www us datex ohmeda com Datex Ohmeda Division Instrumentarium Corp P O Box 900 FIN 00031 DATEX OHMEDA FINLAND Tel 358 10 394 11 Fax 358 9 146 3310 www datex ohmeda com Instrumentarium Corp All rights reserved ...

Page 2: ......

Page 3: ... 2 FEMG 4 2 1 3 AEP 4 2 1 4 Impedance measurement 5 2 2 Main components 5 2 2 1 Neuro board 5 2 2 2 Headbox board 6 2 3 Connectors and signals 7 2 3 1 Module bus connector 7 2 3 2 Module front panel connectors 8 2 3 3 Headbox input connector 8 3 SERVICE PROCEDURES 9 3 1 General service information 9 3 2 Service check 10 3 2 1 Recommended tools 10 3 3 Disassembly and reassembly 14 3 3 1 M EEG 14 3 ...

Page 4: ...ENDIX A 27 SERVICE CHECK FORM A 1 TABLE OF FIGURES Figure 1 Measurement setup 1 Figure 2 Neuro board block diagram 5 Figure 3 Audio stimulator circuitry 6 Figure 4 EEG headbox board block diagram 6 Figure 5 EEG module troubleshooting flowchart 16 Figure 6 Headbox troubleshooting flowchart 17 Figure 7 Exploded view of module box and EEG module 23 Figure 8 Exploded view of headbox 24 ...

Page 5: ...nctional check and planned maintenance The EEG module and the EEG headbox together measure electroencephalography EEG spontaneous facial muscular activity with frontal electromyography FEMG auditory evoked potentials AEP The EEG Headbox N EEG is responsible for EEG and FEMG signal amplification filtering and digitalization and electrode impedance measurement It is situated close to the patient s h...

Page 6: ...lbs Power consumption 3 1 W 1 2 Technical specifications 1 2 1 EEG Amplification 10 000 Resolution 60 nV Max amplitude 800 µVpp Sampling frequency 100 Hz per channel Range 400 µV Frequency range 0 5 30 Hz Input impedance 8 MΩ 10 Hz Noise level 0 5 µV rms from 0 5 Hz to 30 Hz CMRR 100 dB 50 Hz Parameters from power spectrum SEF MF relative power in frequency bands Burst suppression calculated burst...

Page 7: ... 5 1000 Hz Highpass filter off 10 30 50 75 100 150 Hz Single average Averaged responses 100 2000 stimuli Moving average Gross average 100 2000 stimuli Update interval after every 100 stimuli 200 when gross average is 2000 1 2 3 EMG Amplification 50 000 Resolution 100 nV Max amplitude 100 µVpp Frequency range 60 300 Hz Amplitude Root Mean Square RMS 1 2 4 Impedance measurement Measurement frequency...

Page 8: ...tered digitised and software filtered After that the EEG signal is shown on the screen and various characteristics are calculated out of it These include spectrum rms amplitude spectral edge frequency median frequency burst suppression ratio and percentage of total power in four different bands theta 1 4 Hz delta 5 9 Hz alpha 9 13 Hz and beta 13 Hz 2 1 2 FEMG FEMG is electrical signal originating ...

Page 9: ... the electrode and measuring the voltage drop over the electrode This way the impedance of a single electrode can be resolved instead of a sum impedance of an electrode pair 2 2 Main components 2 2 1 Neuro board The Neuro board consists of the following functional sections audio stimulator microprocessor for stimulation and measurement control and for counting the measurement results two serial co...

Page 10: ...f the following functional sections input protection EEG amplifiers and filters FEMG amplifier and filter current feeding circuitry and amplifiers for impedance measurement microprocessor serial communication RS 422 driver Data AEP stimulus Impedance check EEG signal 1 4 1 4 A D AEP stimulus 1 p a t i e n t 15 V CPU 3048 Isolation kV Opto Isolation Power supply Headbox Keys 5 V 12V Figure 4 EEG he...

Page 11: ...or X1 pin description Pin No I O Signal 1 I RESET_RS485 2 I 15 VDC 3 I 15 VDIRTY 4 I 15 VDC 5 I O DATA_RS485 6 I O DATA_RS485 7 Ground Shield 8 I RESET_RS485 9 I CTSB 10 O RTSB 11 I RXDB 12 O TXDB 13 Ground Shield 14 I 32 VDIRTY 15 I GroundDIRTY 16 I CTSC 17 O RTSC 18 I RXDC 19 O TXDC 20 ON STANDBY 21 PWM_ECG 22 RXDD_RS232 23 TXDD_RS232 24 I 5 VDC 25 I 5 VDC ...

Page 12: ...le 2 Headbox connector Pin No Signal 6 8 9 0 1 2 4 5 7 3 1 2 3 4 5 6 7 8 9 0 Ground Ground 15 V TXD EP Audio Power sync 43 kHz RXD EP Sync RXD TXD 2 3 3 Headbox input connector Table 3 Headbox input connector Pin No Signal 1 2 3 4 5 6 7 8 9 10 Lead set id 1 2 3 4 Ground 1 Ref 2 3 4 1 5 6 10 ...

Page 13: ...ould be returned to Datex Ohmeda for repair Datex Ohmeda is always available for service advice Please provide the unit serial number full type designation and a detailed description of the fault The Datex Ohmeda EEG Simulator order No 90502 is recommended for functional checks CAUTION Only trained personnel with appropriate equipment should perform the tests and repairs outlined in this section U...

Page 14: ...o monitors which contain some other monitor software type revision 3 2 1 Recommended tools Tool Order No Notes EEG simulator 90502 Screwdriver Earphones Detach the module box by removing the two screws from the back of the module Be careful with the loose latch and spring pin for locking Detach also the cover of the EEG headbox by removing the four screws from the bottom of the box Be careful with...

Page 15: ...form Fields Field 4 EEG4 Others EEG Montage EEG Channels 4 Others EEG Montage Montage type Bip Others EEG EEG Setup Numeric 1 MF Others EEG EEG Setup Numeric 2 Ampl 4 Plug in the module Check that it goes in smoothly and locks up properly 5 Check that the module is recognized i e the EEG header with related information appears in the chosen waveform fields and Headbox off message is shown on the f...

Page 16: ... the key being pressed is identified i e the corresponding text is highlighted in the service menu Repeat in headbox view with headbox keys 11 Select 10 kΩ as imped pos and imped neg value on the simulator Go to EEG EP service menu and select Check Electr From the headbox view check that the impedances in all four channels are 10 kΩ 1 kΩ 12 Connect the EEG simulator to the headbox Select 2 kΩ as i...

Page 17: ...ensity 90 dB EP EP Size 1 15 Connect the AEP testing cable between the simulator and the headbox Select 2 kΩ as imped pos and imped neg value on the simulator Select 40 µV amplitude in the EP waves menu on the simulator and start AEP measurement in the Others EP menu Wait until you get the response on the display Check that the shape of the response is one period of a sine wave Save EP and adjust ...

Page 18: ... module reverse the order of the disassembly steps CAUTION When reassembling the module make sure that the cables are reconnected properly 3 3 2 N EEG Disassemble the N EEG in the following way See Figure 8 Exploded view of headbox 1 Remove the four screws from the bottom of the headbox 2 Lift off the cover and disconnect the two cables connected to the EEG headbox board 3 Disconnect the module he...

Page 19: ...first electrode pair is connected Electrode impedance measurement is not available on menus EP measurement is on Wait until EP measurement ends or stop EP measurement Electrode impedances show and check ground electrode message is displayed on number fields after impedance measurement Ground electrode is poorly connected to patient or ground electrode cable is not connected to headbox Check the el...

Page 20: ...oard Yes No Connect headbox into m odule connector Yes Yes Check fromheadbox vieware the Tim eouts HBM od Bad Checksums or Mod Hb Bad Checksums running OK Check front panel key functions Yes Does another m odule work with headbox No Yes Fault not in EEGm odule No OK Is the keypad connected No Connect the keypad No Does the test pass with another keypad Yes Replace the keypad Yes Replace Neuro boar...

Page 21: ...box and start A EP m easurem ent Yes C an clicks be heard No Yes Yes No T ry w ith another headbox m odule cable or check the cable by hand Replace the H eadbox board No Yes C heck HBRomError O K No Yes Try w ith another headbox m odule cable or check the cable by hand Fault in cable R eplace the headbox m odule cable Yes Is earphone jack intact and connected to headbox circuit board N o C onnect ...

Page 22: ...Datex Ohmeda S 5 monitors Document No 800 1011 1 18 5 SERVICE MENU Press the Monitor Setup key select Install Service password 16 4 34 select Service password 26 23 8 select Parameters More EEG EP ...

Page 23: ...box 0 means no montage 1 basic 2 general 3 AEP 4 Mont4 etc up to 8 which means Mont8 Montage type shows whether the montage is bipolar or referenced EP Start Stop is highlighted when the EP Start Stop button is pressed in headbox or module Imp Check is highlighted when the Imp Check button is pressed in headbox or module Imp Meas shows 1 if the impedance measurement is on in the module Headbox Off...

Page 24: ...tor to module RAM indicates the state of the RAM memory ROM indicates whether the checksum at the EPROM is accordance with the one the software has calculated EEPROM indicates if the values stored in permanent memory are valid The states in memory checks are OK Fail or module not in place or a communication error Headbox Service data is changed to headbox view EP Start Stop is highlighted when the...

Page 25: ...le and headbox 1 means bipolar and 0 referenced 60 Hz is 1 if the power frequency filter is set for 60 Hz power frequency Imp Meas shows 1 if the impedance measurement is on in the headbox Imp Check Failed shows 1 if the impedance check has failed EP Meas shows 1 if the evoked potential measurement is active in headbox High EP Sampl Rate shows 1 if the headbox uses higher sampling rate for 10 ms E...

Page 26: ...2 EEG Channels Number of active channels in EEG measurement Montage Type Selection of bipolar Bip referenced Ref montage Cycle EP measurement repetition time Stim Frequency Ep measurement s stimulation frequency Stim Intensity Intensity of EP stimulus ...

Page 27: ...tem Description Order code 1 Module box single width 886167 5 Neuro board 898806 2 Latch 879181 6 Cross cylinder head screw M3 12 628700 3 Spring pin 879182 9 EEG input board 896571 4 Cross recess screw M3 8 black 616215 10 Metal frame 879184 7 Front panel unit 896484 11 Cross cylinder head screw M3 6 61721 8 Membrane keypad 880101 6 1 2 S 5 M EEG rev 01 Figure 7 Exploded view of module box and EE...

Page 28: ...10 7 Cover 896457 3 Headbox input unit 896558 8 Base 896557 4 AEP connector 896461 9 Cross cylinder head screw M3x6 617210 5 EMC cover 898276 10 Screw MRX Z M3x12 FZB DIN 8985 61736 Screw to connect cable shield to EMC cover 61721 Nut to connect cable shield to EMC cover 63116 Washer to connect cable shield to EMC cover 63407 6 1 4 S 5 N EEG rev 01 Figure 8 Exploded view of headbox No new spare pa...

Page 29: ...S 5 N EEG Rev 01 Electrode sticker DA 898693 898708 898207 DE 898684 898699 897858 EN 898683 898698 897858 ES 898687 898702 898203 FI 898690 898705 897858 FR 898685 898700 898201 IT 898688 898703 898204 JA 8000381 8000382 8000393 NO 898692 898707 898208 NL 898686 898701 898202 PT 898689 898704 898205 SV 898691 898706 898206 ...

Page 30: ...Datex Ohmeda S 5 monitors Document No 800 1011 1 26 7 EARLIER REVISIONS Revision Manual slot main manual Note M EEG rev 00 and N EEG rev 00 896622 1 896624 ...

Page 31: ...APPENDIX A Service check form S 5 M EEG and N EEG Document No 800 1011 1 27 APPENDIX A ...

Page 32: ...Datex Ohmeda S 5 monitors Document No 800 1011 1 28 This page intentionally left blank ...

Page 33: ... Internal parts 2 External parts of module 3 External parts of headbox 4 Installation 5 Recognition of module 6 Recognition of headbox 7 Module software M EEG N EEG 8 Communication and memories of module 9 Communication and memories of headbox 10 Membrane keys 11 Impedances Channel 1 9 11 kΩ Channel 2 9 11 kΩ Channel 3 9 11 kΩ Channel 4 9 11 kΩ 12 Checks with simulator Allowed range Waveforms 195 ...

Page 34: ...ment No 800 1011 1 OK N A Fail OK N A Fail 14 AEP stimulation 15 AEP response Channel 1 35 45 µV Channel 2 35 45 µV 16 Electrical safety check 17 Functioning after electrical safety check 18 Final cleaning Notes Used Spare Parts Signature ...

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