GE S5 Service Manual

							Service Menu
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4.13 EEG & EP
Service menu for EEG Module for 
electroencephalography and evoked potentials (EP) 
measurements.
Check Electr.: Headbox measures impedance of 
electrodes. Works the same way as from EEG menu or the 
headbox/module button.
Start AEP: AEP measurement is started with current AEP 
settings.
Module: Service data is changed to the module view 
(some of the data in this view is though from headbox).
Headbox: Service data is changed to headbox view.
Service data in module view
Measurement shows whether the EEG measurement is 
ON or OFF. Measurement should start by itself when the 
leads have been on for about 15 seconds.
Montage shows the active montage in monitor.
HB Montage shows the montage attached to headbox. 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 shows 1 if the headbox cable is not connected to the module.
EP Meas. shows 1 if the evoked potential measurement is active in the module.
Sending EP shows 1 if the module has acquired 100/200 new epochs and is sending them to the monitor.
Par. Error shows 1 if the evoked potential parameters active in the module are conflicting with each other.
Reserved 1 is reserved for future use.
Reserved 2 is reserved for future use.
HB Mod Timeouts is a cumulative number that indicates how many times the headbox has not responded to the 
module’s inquiry.
HB Mod Bad Checksum is a cumulative number that indicates how many times there has been an error in the message
 
from the headbox to the module.
Mod HB Bad Checksum is 1 if there has been errors in the messages from the module to the headbox.
Mod Mon Timeouts is a cumulative number that indicates how many times the module has not responded to the 
monitor’s inquiry.
Mod Mon Bad Checksum is a cumulative number that indicates how many times there has been an error in the 
message from the module to the monitor.
Mon Mod Bad Checksum is a cumulative number that indicates how many times there has been an error in the 
message from the monitor to the module.
RAM indicates the state of the RAM memory.
ROM indicates whether the checksum at the EPROM is in accordance with the one the software has calculated.
EEPROM indicates if the values stored in the permanent memory are valid.
The states in memory checks are OK, Fail or ? (module not in place or a communication error). 
						

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Service data in Headbox view
EP Start/Stop is highlighted when the EP Start/Stop 
button is pressed in the headbox or module.
Imp. Check is highlighted when the Imp. Check button 
is pressed in the headbox or module.
Active shows 1 if the channel is active.
Lead off+ shows the lead off status of all plus 
electrodes. 0 means that the lead is on and 1 that the 
lead is off.
Lead off- shows the lead off status of all minus 
electrodes. 0 means that the lead is on and 1 that the 
lead is off.
Imped+ shows the impedance of plus electrodes of the 
last impedance check in all channels.
Imped- shows the impedance of minus electrodes of the 
last impedance check in all channels.
BSR shows the burst-suppression classification of EEG waveforms. 0 means artifact, 1 suppression, 2 burst and 3 
invalid (the EEG is not classified).
Artefact shows the artefact status of all channels. 0 means that there are no artefacts on the signal and 1 means 
that there are artefacts.
Noise shows 1 if the activity of FEMG is too high for clean EEG signal and that EEG is not probably reliable.
EMG AD shows the latest AD conversion result of FEMG signal without any filtering or scaling.
Leadset AD shows the latest AD conversion result of lead set signal without any scaling.
Bipolar shows the montage type that is active in the module 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.
Mu
EP Meas. shows 1 if the evoked potential measurement is active in the headbox.
High EP Sampl. Rate shows 1 if the headbox uses higher sampling rate for 10 ms EP measurement.
EP Epoch Points shows the number of samples collected for each epoch.
EP Channels shows the number of channels used in EP measurement.
Hb ROM Error is 1 if the checksum at the EPROM is not in accordance with the one the software has calculated. 
						

							Service Menu
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                                          Document no. M1031519-01
4.13.1 EEG & EP Setup
The items in the setup menu are a collection of items in 
normal EEG and EP menus. There are no special service 
settings in this menu. 
Imp. Cycle: Impedance measurement repetition time.
Select Montage: Selection of headbox’s electrode 
configuration.
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. 
						

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4.14 BIS
Service menu for BIS Module, E-BIS or M-BIS, for Bispectral index measurements.
Module service page
Check Sensor activates the sensor impedance check.
Module
Measurement indicates if BIS Engine is on: ON/OFF.
Imp. Check Key  indicates that the key in the module 
front panel works properly.
Bis Menu Key indicates that the key in the module front 
panel works properly.
Impedance Meas indicates the impedance 
measurement mode. The modes are 
CYCLIC/COMBINED/GROUND/OFF.
BIS Engine errors: error messages created by DSC or 
BIS Engine. For a detailed description of the error 
message see Table 11 BIS Engine and DSC error 
messages. 
Statuses (HEX): See APPENDIX A How to read HEX 
numbers.
General Status1 indicates the general status of the 
module. For a detailed description of the message see Table 9 Module general status.
Bis_status1 indicates the BIS Engine status. See Table 10 BIS Engine status for a detailed description of the 
message.
Msgs to BE number of data packages sent from the interface board to BIS Engine.
Msgs from BE number of data packages sent from BIS Engine to the interface board.
Mod Mon Timeouts is a cumulative number that indicates how many times the module (interface board) has not 
responded to the monitor’s inquiry.
Mod Mon Bad Checksum is a cumulative number that indicates how many times there has been an error in the 
message from the module (interface board) to the monitor.
Mon Mod Bad Checksum is a cumulative number that indicates how many times there has been an error in the 
message from the monitor to the module  (interface board).
Bad Checksums from BIS is a cumulative number that indicates how many times there has been an error in the 
message from the BIS Engine to the module interface board.
RAM indicates the state of the RAM memory.
ROM indicates whether the checksum at the EPROM is in accordance with the one the software has calculated.
EEPROM indicates if the values stored in the permanent memory are valid.
The states in memory checks are OK, Fail or ? (module not in place or a communication error).
Measured parameters indicated:
BIS indicates BIS index; range 0...1000 (corresponds to 0...100)
SQI indicates signal quality index; range 0...1000 (corresponds to 0..100)
EMG indicates EMG activity level; range 0...10000 (corresponds to 0...100dB  NOTE! On the display, EMG will be 
shown between 30...55dB on the bar graph or 30...80dB on the trend)
SR indicates supression ratio; range 0...100 (corresponds to 0...100%) 
						

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General_Status1     Module general status
Table 9 Module general status
BIS_Status1    BIS Engine status
Table 10 BIS Engine status
Table 11 BIS Engine and DSC error messagesbit 0-5 Not used
bit 6 State error
bit 7 Communication failure
bit 8 Power failure
bit 9 Clock failure
bit 10 EEPROM checksum failure
bit 11 EEPROM writing failure
bit 12 ROM failure
bit 13 RAM failure
bit 14 Test mode
bit 15 Init mode
bit 0 Check Sensor key pressed
bit 1 BIS key pressed
bit 2 Inpedance check mode cyclic
bit 3 Impedance check mode combined
bit 4 Impedance check mode ground
bit 5 Impedance check off
bit 6 Measurement on
bit 7 EEG measurement on
bit 8 Impedance check on DSC channel 1 passed
bit 9 Impedance check on DSC channel 2 passed
bit 10 BIS Engine powerup failure
bit 11 DSC selftest failure
bit 12 DSC quick test failure
bit 13 DSC selftest on
bit 14 No data from BIS Engine
bit 15 Not used 
						

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Message Errors of type 2
Illegal message ID Errors for layer 3 packets
Illegal command parameter
Illegal length for layer 2 data
Disabled interrupt received - 
UART transmitter empty interruptUART related errors
Disabled interrupt received -
UART modem interrupt
No status nibble received DSC related errors
DSC not connected
DSC disconnected after test failure
Illegal DSC ID
DSC power regulation fault
DSC interface fault
DSC did not respond to command
Illegal PIC ID
DSC overcurrent
DSC overrun
EEPROM Bad packet length Software update related errors
EEPROM Bad checksum
EEPROM Bad code length
EEPROM Illegal packet subtype
EEPROM physical write error
EEPROM NOT_DATA_TIMEOUT 
						

							Service Menu
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4.14.1 Sensor 
Sensor type: indicates the type of the sensor connected.      
Lot code: indicates the manufacturing lot code of the 
sensor. The lot code contains the manufacturing date 
and shift.
Serial no: indicates the serial number of the sensor.
Shelf life: indicates max storage duration.
Usage count: indicates how many times the sensor has 
been attached/detached. Not in use.
Mains Freq.:  indicates the set mains frequency; 
50Hz/60 Hz.
Sensor Impedances: indicates the last measured 
impedances.
Imped. indicates the measured impedance value in 
Kohms.
Qualif. indicates the quality of the measured 
impedance; PASS/FAIL.
BE powerup test: indicates the status of BIS Engine power up test: PASS/FAIL.
DSC selftest ch1: indicates the DSC selftest status for channel 1: PASS/FAIL.
DSC selftest ch2: indicates the DSC selftest status for channel 2: PASS/FAIL.
Measured parameters indicated:
BIS indicates BIS index; range 0..1000 (corresponds to 0..100)
SQI indicates signal quality index; range 0..1000 (corresponds to 0..100)
EMG indicates EMG activity level; range 0..10000 (corresponds to 0..100dB) 
(NOTE! On the trend display, EMG will be shown between 30..80dB) 
SR indicates supression ratio; range 0...100 (corresponds to 0..100%)
Statuses (HEX): See APPENDIX A How to read HEX numbers.
DSC status: indicates the DSC status for the four channels. See  Table 12 DSC status for a detailed description of 
the message. 
Sensor status: indicates the Sensor status. See Table 13 Sensor status for a detailed description of the message.
BE powup stat: indicates the BE power up status. See Table 14 BE power up status for a detailed description of the 
message. 
						

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Table 12 DSC status
Table 13 Sensor status
Table 14 BE power up statusbit 0 Noise test
bit 1 BIS key pressed
bit 2 Blocked droop test
bit 3 Unblocked gain test
bit 4 Impedance wait time out test
bit 5 Noise timeout test
bit 6 Blocked timeout test
bit 7 Unblocked timeout test
bit 8 DSC not connected test
bit 9 Not used test
bit 10 Not used test
bits 11 - 
15Not used
bit 0 Quick selftest pass
bit 1 Quick selftest gain
bit 2 Quick selftest noise
bit 3 Quick selftest fail
bit 4 Quick selftest valid
bit 5 Sensor valid
bit 6 Sensor invalid
bit 7 Sensor too many uses
bit 8 Sensor expired
bit 9 Sensor validity unknown
bits 10 
-15Not used
bit 0 XRAM test
bit 1 Dma test
bit 2 Timer test
bit 3 Fpga test
bits 4 -15 Not used 
						

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4.14.2 BIS Setup
Automatic Check:  A selection to define whether the 
automatic sensor check is used ON/OFF.
Test DSC indicates the status of the DSC self test; 
PASS/FAIL.
Filters: A selection to define if filters are used 
ON; disturbances are filtered from the raw EEG signal 
OFF; raw EEG signal is shown. 
						

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4.15 Entropy
Check Sensor Module measures the impedance of 
sensor electrodes. Works the same way as from Entropy 
menu or module key.
Module Service data is changed to the module view.
Measurement shows whether the Entropy measurement 
is ON or OFF. Measurement should start by itself when the 
sensor is attached to the patient. 
Last service shows the date of last maintenance.
Entropy refers to the respective module key. Is 
highlighted when the Entropy key is pressed on the 
module. (Opens the Entropy menu.)
Check Sensor is highlighted when the Check Sensor key 
is pressed on the module. Activates the sensor check.
Mains shows the currently used mains frequency, 50 or 
60 Hz:
BSR Status shows Burst if the module is not currently detecting suppressed EEG. Shows Suppression if the module is 
detecting suppressed EEG periods.
Artefact shows Off, if there is no high-frequency noise present, On if the module detects noise.
Diathermy shows On, if the module is detecting diathermy (i.e., electrocautery).
AD clipped shows On, if the signal is getting clipped at the A/D converter.
Alg. ver. (Mon) shows the monitor algorithm version number.
Alg. ver. (Mod) shows the module algorithm version number.
Alg. ver. used shows the currently used algorithm version.
Timeouts is a cumulative number that indicates how many times the module has not responded to the monitor’s 
inquiry.
Mod Mon Bad Checksum is a cumulative number that indicates how many times there has been an error in the 
message from the module to the monitor.
Mon Mod Bad Checksum is a cumulative number that indicates how many times there has been an error in the 
message from the monitor to the module.
RAM indicates the state of the RAM memory.
ROM indicates whether the checksum at the EPROM is in accordance with the one the software has calculated.
EEPROM indicates if the values stored in the permanent memory are valid. The states in memory checks are OK, Fail 
or ? (module not in place or a communication error).