EEG-Z3 (SA7680Z) - Thought Technology, Ltd.
Contents
1. 1 ABOUT EEG MODE lea ut tee Eoo Ove v nt e Ue CERRO ELE 2 ABOUT EP 0 01 HZ MODE ALSO CALLED LOW FREQUENCY 2 ABOUT SGP DG MODE 2 ZEROING THE SENSOR WHEN THE SIGNAL DRIFTS OUT OF RANGE 3 ZEROING THE SENSOR sessdccuseteccsitedasotidetiscousetacons dade lezidedessaudeaecssedededcandesuccaededecusedudeceacdeseeces 3 ZEROING PROGEDURE do ce ie eier 4 SELECTING ALTERNATIVE BASELINES IN SCP DC MODE cere eene nnn nnn nnn 4 MISCELLANEOUS NOTES aa e s cU sence v os Y ve a Ea weg neue ic etes cmt rene 4 DEVICE SPECIFICATIONS RR ss RR RR nnmnnn 5 PLACING OBDERS iere ELENA E mean 6 TECHNICAL SUPPORT 6 WARRANTY reps caveadvcasdeaduscevecdes caveudecuavesceu cdvecdsevaveecveusveyeve 6 RETURNING ann nun ann nun RR sa ur RR ss une sara u Rea 7 REPAIR RETURN FORM 25 3 223 nau Hanna nna n acra o nn nn nn a Un a ERN EYE on nn2. nn nn 8 Manual No SA7682 rev 0 copyright Thought Technology Ltd 2009 Pay EEG Z3 User Guide i Pay EEG Z3 User Guide Functional description The EEG Z3 can be used on its own for EEG neurofeedback or in combination with the TT AV Sync sensor T7670 and a push button switch SA7660 When combined these sensors comprise a system designed for evoked and slow cortical potentials and Go NoGo motor response protocols The EEG Z3 can be used in any of the following three modes All three modes support impedance checking e Standard mode for regular EEG similar to the EEG Z sensor e 0 01 Hz 0 01 Hz frequency cutoff for evoked event related potentials and slow cortical potentials SCP DC mode for measuring slow cortical potentials A Set Zero button allows quick switching between modes LED indicators identify the active mode When it is powered off the sensor remembers the mode in which it was last used In all three modes if the signal approaches or passes the limit of the range that the sensor can measure the LED will blink rapidly This is useful in SCP DC mode in which the Set Zero button can be used to return the signal to baseline Sensor components e EEG Z3 sensor e Zeroing cable e Sensor cable SA9385 For connection of EEG Z3 sensor to encoder e EEG Electrodes Note If you will use the EEG Z3 sensor in EP 0 01Hz or SCP DC mode make sure you are using sintered S
3. Ag AgCl electrodes Apply a conservative amount of gel to the electrode Too much gel can contribute to drift but too little will make poor contact and cause high impedance The ideal amount of gel should not protrude from the edge of the electrode shown below and should form a thin ring around the electrode when it is fixed to the scalp e Affix the electrode to the pad of paste on the scalp Press lightly just enough to fix the electrode and spread the gel slightly around the perimeter of the disc shown right Even with special care to reduce electrode polarization an initial period of polarization is unavoidable For this reason after the initial placement of electrodes on the subject a settling time of 10 to 20 minutes is usually necessary before beginning a session Zeroing the sensor when the signal drifts out of range In SCP DC mode when the LED blinks to indicate that the signal is approaching the limits of the sensor s range you can use the Set Zero button to bring the signal close to the baseline again To select a different baseline than the middle of the range follow the guidelines described in Selecting alternative baselines in SCP DC mode on page 4 Note This mode is sensitive to both eye and head movement and care should be taken to minimize both actions during sessions in this mode Zeroing the sensor Note n this section zeroing refers to software zeroing To use the sensor in EEG mode with a
4. Wizard in the BioGraph Infiniti software The procedure is described below under Zeroing the sensor Note that most applications involving signal processing of EEG do not include the very low frequency content of the signal and this offset removal may not be necessary It should be done in all case in which the raw EEG or EEG lt 2 Hzis used About 0 01 Hz mode also called low frequency mode When you first enter this mode a settling period is imposed during which the signal returns from an out of range value to the baseline This normally requires approximately 100 seconds as it is based on the time constant of the system in this mode Note This mode is sensitive to both eye and head movement and care should be taken to minimize both actions during sessions in this mode About SCP DC mode Used for DC measurements and slow cortical potential assessment and training As is to be expected with DC measurements in this mode the EEG Z3 is subject to the DC drift of the system Since electrode polarization is a major contributor to drift the following guidelines should be followed to reduce DC drift e Prepare skin well using skin prep Always wipe the area clean with a dry cloth after preparation e Spread a thin coat of electrode paste over a small area of prepared skin shown right This serves to keep track of the site and to prepare for better contact with the electrode Pay EEG Z3 User Guide 2 e Use sintered
5. any phase sensitive measurement To control for this issue use multiple EEG Z3s in low frequency mode for any measurement where uniform phase response is required near or below 1Hz Pay EEG Z3 User Guide Device Specifications Specification Value Accuracy lt 1 0 Input Impedance Differential 10060 paralleled with 270pF Common mode 100GQ paralleled with 200pF Noise lt 0 5 CMRR excluding CM signal active cancellation gt 100dB CM active cancellation effect gt 40dB 10 120Hz Electrode offset tolerance Slow AC and DC modes 100mV Bandwidth lower cutoff 3dB EP 01Hz mode 0 01 Hz Bandwidth lower cutoff 3dB EEG mode 1 5 Hz Bandwidth upper 3dB all modes 1600KHz Pay EEG Z3 User Guide Placing Orders Outside USA Tel 1 514 489 8251 Fax 1 514 489 8255 In USA Toll Free Tel 1 800 361 3651 E Mail mail thoughttechnology com Or contact your local authorized distributor Technical Support Outside USA Tel 1 514 489 8251 Fax 1 514 489 8255 In USA Toll Free Tel 1 800 361 3651 E Mail techsupport thoughttechnology com Or contact your local authorized distributor Warranty The EEG Z3 sensor is guaranteed to be free from defects in material and workmanship for 1 year from the date of purchase In the unlikely event that repair is necessary contact Thought Technology Ltd to receive a Return Authorization n
6. EEG Z3 SA76802 User Guide SCP DC EP 01Hz EEG Set Zero SA7680Z X E E m 9 a u Par Tx Thought Technology Ltd 2180 Belgrave Avenue Montreal Quebec H4A 218 Canada Tel 800 361 3651 514 489 8251 Fax 514 489 8255 E mail mail thoughttechnology Website www thoughttechnology com CAUTION U S federal law restricts this device to sale by or on the order of a physician or any other practitioner licensed by law of the state in which he or she practices to use or order the use of this device To diminish the risk of spreading communicable diseases always use good hygiene practices with reusable EEG electrodes particularly if abrasive substances are used In all cases refer to your facility s infection control procedure IMPORTANT Do not connect inputs or outputs to line powered devices except through the fiber optic cable INTENDED PURPOSE Intended for Biofeedback and Muscle Re education Not For Diagnostic Purposes Pay EEG Z3 User Guide TABLE OF CONTENTS FUNCTIONAL DESCRIPTION nnn nnn ann nun ann ann nun ann nun sa asus sa RR ann sa een sar une 1 SENSOR COMPONENTS 1 5 7 rence ba dere oo Dog cuve dave ou Eoi cop ao ovans o UsFa 1 CONNECTING THE SENSOR
7. ilver Silver Chloride Ag AgCL electrodes For other modes the use of standard EEG electrodes is adequate Connecting the sensor LEDs indicate mode signal out of range Negative yellow SCP DC EP 01Hz encoder Positive blue Set Zero Ground black SA7680Z X Set Zero button switch mode reset baseline in DC mode Pay EEG Z3 User Guide 1 1 Connect the electrodes to the sensor using color coded DIN cables Respect the color coding as indicated in the preceding photograph Note When using standard EEG electrodes use preferred method to affix to the scalp When using sintered Silver Silver Chloride Ag AgCI electrodes follow the procedure outlined in About SCP DC mode 2 Connect the EEG Z3 sensor to the encoder using a sensor cable T9385 Note Ifthe EEG Z3 sensor is being used with the TT AV Sync for time locked EEG averaging such as evoked and slow cortical potential averaging both sensors must connect to encoder inputs that have the same sampling rate either both 256 s s or both 2048 s s 3 select the sensor mode a Press and hold the Set Zero button for about 3 seconds The LED lights will begin to cycle through the 3 modes b Release the Set Zero button when the LED lights up for the mode you want to use About EEG mode This mode requires you to zero the sensor remove the offset or non zero baseline prior to first time use using the Calibration
8. op e If signal drift is minimal OR is up and down OR you don t know the direction of drift select Middle This will place the baseline close to 0 This is the default baseline setting This selection is made by double clicking the Set Zero button With a session running in BioGraph Infiniti double click the button and see what happens Ensure that there is enough visible range on the y axis of the graph or that it is in autoscale mode Each time you double click the levels will cycle in the following order High Up Low Down and Zero such that you may select the desired baseline level Once selected zeroing the sensor by pressing the Set Zero button once will return the signal to this baseline The sensor resets its baseline to the default level Middle when it is powered off Miscellaneous notes 1 2 Since the EEG Z3 cannot be used in SCP DC mode with a Legacy protocol it cannot be used with ProComp2 or ProComp encoders or with ProComp Infiniti or FlexComp Infiniti encoders if they have been set to Legacy mode The phase response of the EEG Z3 is not well matched with that of the EEG Z at very low frequency less than 5 Hz more so around 1 Hz For this reason we recommend the following e Donot mix EEG Z3 and EEG Z sensors when comparing channels for phase at low frequencies In this situation use one type or the other e Consider the effects of phase shift whenever the frequency of interest approaches 1Hz for
9. turn Form Be sure to contact us for authorization before returning any equipment Remove this sheet and include with returned unit s Include copy of original invoice and return to the address in the Returning Equipment section Name Company Address Phone No Fax No Date Purchased From Whom Model Name Serial Number Problem Pay EEG Z3 User Guide
10. umber Then send the unit back by a traceable method Thought Technology will not be responsible for items not received We will repair or replace your unit s that are still under warranty free of charge This warranty does not apply to damage incurred through accident alteration or abuse Pay EEG Z3 User Guide 6 Returning Equipment Be sure to contact us for a return authorization number RA before returning any equipment 1 Send the unit s postage prepaid and insured with proof of purchase to one of the addresses below 2 If you are shipping from outside Canada and the USA to Canada label the package Goods to be repaired Made in Canada to avoid unnecessary customs charges All customs and duties charges will be billed to you if incurred by sending the unit without this label or to the wrong address 3 Provide a detailed description of the problem you are experiencing and your telephone fax number see form on the last page of this manual In the USA ship insured to Thought Technology Ltd Cimetra LLC 20 Gateway Drive Plattsburgh New York 12901 USA In Canada and all other countries contact your dealer or ship insured to Thought Technology Ltd 2180 Belgrave Avenue Montreal Quebec Canada H4A 218 Contact information for service C3 Canada and International 1 514 489 8251 E EH USA 1 800 361 3651 0 service thoughttechnology com Pay EEG Z3 User Guide 7 Repair Re
11. zero baseline the EEG Z3 sensor must be zeroed before its first use on a given channel on a given encoder and then as required to maintain its accuracy When zeroing is complete for a specific sensor on a specific channel of the encoder this information is saved on the system Zeroing must be repeated if e A different EEG Z3 sensor is connected to the same channel of the encoder e The same EEG Z3 sensor is connected to a different channel of the encoder e The same EEG Z3 sensor is connected to a different encoder Pay EEG Z3 User Guide 3 Zeroing procedure 1 Connect the EEG Z3 sensor to the encoder Connect the zeroing cable shown right to the EEG Z3 sensor Open a session in BioGraph Infiniti From the Options menu of the Recording Screen select Sensor Calibration From the list select the channel connected to the EEG Z3 and click Zero Now to start the Zeroing Wizard The wizard guides you through the zeroing procedure Selecting alternative baselines in SCP DC mode The Zero function in this mode is necessary to operate in the presence of DC drift Since drift tends to be in one direction there are three baseline levels that you can choose from e the signal is drifting UP select Low This will place the baseline in the lower half of the sensor range toward the bottom e Ifthe signal is drifting DOWN select High This will place the baseline in the upper half of the sensor range toward the t
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