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SynAmps2TM Compumedics Neuroscan USA Ltd.

1. ATTENTION CONSULT ACCOMPANYING DOCUMENTS BEFORE USING The SynAmps Model 8050 EEG amplifier and data acquisition system is a line powered instrument designed to meet the applicable requirements of IEC601 1 1988 The SynAmps should be used only according to the manufacturer s instructions Replacement parts and accessories may be obtained from the manufacturer Manufacturer Compumedics Neuroscan USA Ltd 6605 West W T Harris Blvd Suite F Charlotte NC 28269 Phone 877 717 3975 8am 5pm EST E mail techsup neuroscan com Web www neuroscan com This equipment has been tested and found to comply with the limits and requirements for a Class A device per EN60601 1 2 These limits and requirements are designed to provide reasonable protection under conditions of normal use from interference with and by other devices There is however no guarantee that interference will not result from operation of this device in proximity or connected to some other device If interference occurs the user or operator is encouraged to try to correct the interference by one or more of the following measures 1 Change the orientation of the two devices relative to one another 5 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B 2 Increase the separation between the two devices 3 Check the power source and grounding for the two devices and Consult the dealer Neuroscan Technical Support or an experienced technician for help
2. 1 and 1V but not 1 and 5V Enable the field and enter the voltage you want to use There is one independent Volts voltage source per amplifier headbox see the pinout information below The DC output begins at the start of acquisition and ends when acquisition is terminated The maximum voltage is 9V If you need a DC voltage please consult your device specifications In our example there is no DC output voltage Leave it disabled 9 The HLI is now completely configured and you should save the setup file with the HLI configuration Click the Save As button at the bottom of the Setup display or click File Save Setup Additional Information Input voltages The High Level Inputs have a full scale range of 5V Beyond that damage can occur so be careful to verify the output voltages of the peripheral devices before connecting them to the SynAmps If the output voltages are for example 10V we recommend that you use a 3 1 voltage divider 44 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B 14 pin Redel connector The pin connections for the connectors for the High Level Inputs are Hi Level Channel 1 Active positive Input Positive Sensor DC Supply software programmable voltage out Signal Ground Hi Level Channel 2 Active positive Input No Connection No Connection Hi Level Channel 2 Reference negative Input Signal Ground Negative Sensor DC Supply software programmable voltage
3. Select Edit gt SynAmps Hardware In multiple systems it is possible to query each amplifier by clicking on the drop down arrow and selecting the desired SynAmps2 If your SynAmps and PC are communicating correctly you will see the dates and version information in the o ho fields If not there is a communication problem with the SynAmps2 In most cases this is resolved by installing the correct drivers see Installing the SynAmps Driver above If you still have communication problems contact techsup neuroscan com 28 MN View Acquisition Options To Overall Parameters Channel Layout Channel Assignment Table Wake default setup subject Synampse Hardware Synamps2 Hardware Setup E sl DLL version 71 0 Amplifier Select Amplifier Number D Info Click here to get device Info Info Trigger test Click here to test trigger port Test Update Click here to update firmware SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Configuring the SynAmps in the ACQUIRE Program The configuration of the SynAmps is accomplished within the ACQUIRE program and the parameters are saved in a setup file ast extension Go into the ACQUIRE part of the program select a setup file from the ones provided or create your own from scratch The complete operation of the ACQUIRE program is contained in the ACQUIRE manual Settings specific to SynAmps are described below The pa
4. all of the first headboxes and then use some or all of the channels from the last one In other words you can only leave holes unused channels in the last headbox If there are channels in the first headbox you are forced to record even though you do not want them record them as Bad channels Hide them if desired and then use the Delete Bad Channels option in EDIT to create a new CNT file without the Bad channels Calibration Check With modern amplifiers like SynAmps2 there is no need for calibration by the user The factory set calibration is more precise than any software correction that could be applied Instead of a software calibration as with the original SynAmps we provide a Calibration Check for the amplifiers The Calibration Check tests both AC and DC functions of the amplifiers The results will indicate that the amplifier is either functioning properly or not Pass Fail The amplifier performance does not degrade it is either performing accurately or it has failed The Calibration Check should be performed periodically to verify performance and especially if the recordings indicate a problem with one or more channels To perform a Calibration Check please complete the following steps 47 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Step 1 Connect the shorting plug to the cap connector on the headbox all headboxes if you have more than one The shorting plug is somewhat more th
5. as otherwise noted The slopes are greater than or equal to 12dB octave 36 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B High pass Filters High pass filter values The table shows the high pass low cutoff frequency filter AE lkHz CAT ei rr values Values range from DC to 300Hz Digital high pass values start from 0 1Hz Researchers interested in lower DC DC DC DC DC frequencies i e 01Hz should record with the DC setting HR ios DS 05 05 A filter setting of 01Hz in the past has been used as an vl 1 SE a5 dl approximation to true DC recordings With the SynAmps2 a E e Sp one does not have to approximate DC since the amplifier 5 o E S p is a DC system Shown below are the high pass filter 5 5 5 5 5 values Se 10 10 10 10 30 30 30 30 100 100 100 100 150 150 300 300 l ac coupled mode only Notch Filters and Noise Narrow band notch filters centered at 50 and 60Hz are available to reduce main power Motch frequency interference Although these filters are very sharp and affect a narrow range of the EEG spectrum caution should be exercised in their use Many evoked potentials have energy in the 50 60Hz band and data may be significantly distorted Notch filters UI hd should not be used routinely Rather attempts to reduce noise in the recording Uff environment should be made first before adding a notch filter The option for the filter is found on the Amplifiers SN2 options
6. difficulty it is a good idea to go through this list from the beginning to narrow down the problem Triggering problems present themselves in three forms 1 no trigger pulses are received by the SCAN system 2 incorrect type codes are received by the SCAN system 3 stimulus triggers are missed intermittently Causes of triggering difficulty Software configuration 1 2 Problem The threshold value may be set incorrectly resulting in spontaneous acquisition of sweeps by the ACQUIRE program 63 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Solution For STIM to SCAN triggering between I O ports on the backs of the STIM and SCAN interface modules a threshold value of 0 zero should be used 3 Problem The Interstimulus interval is shorter than the acquisition interval In other words a second stimulus is occurring before ACQUIRE has finished recording the epoch associated with the first stimulus Solution Determine the length of epoch that is necessary for your EEG recording The shortest ISI in your stimulus presentation setup should be larger than the poststimulus portion of this epoch A stimulus that is associated with a trigger pulse should never be presented during the time that ACQUIRE is recording an epoch If it is the trigger pulse will be missed by ACQUIRE Note that this problem can be avoided by acquiring data continuously without gaps 1 3 Problem The dwell time the inverse of the dig
7. information is displayed in the adjacent fields to the right The Range values indicate the upper and lower voltage limits for each channel if the incoming voltage exceeds these limits the channel will clip or saturate The Range for SynAmps2 in DC mode is 200mV In AC mode it is 1mV The difference is due to the relationship between Gain and the Range the lower the Gain the broader the Range In DC mode the Gain is 10x In AC mode it is 2010x Therefore the Range in DC mode is much broader Accuracy refers to the precision of voltage measurement along the y axis The value displayed indicates the resolution or accuracy in microvolts If the resolution is for example 06uV then the voltage resolution will be in 06uV steps This is similar to the dwell time on the x axis or in other words the time difference between adjacent data points Accuracy is the least measurable voltage difference between points 32 bits are available to describe voltage that is 2 to the 32nd power minus 1 discrete voltage values are possible per data point The Accuracy is thus interactive with the Gain The Accuracy value displayed computed from the number of bits and input range does not indicate the actual accuracy that is available This has a maximum given the intrinsic noise of the system but will also be highly influenced by the environment 35 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Filter Values Filtering o
8. is possible and if liquids are spilled on or in the area of the device it should not be used until it can be ensured that the fluid or its residue will not affect device operation Questions should be directed to the manufacturer or its representatives Cleaning Instructions The SynAmps enclosure may be cleaned with a damp sponge or cloth and mild nonabrasive cleanser Take care to ensure that liquid does not spill in or on the device Do not use abrasives or detergents Sterilization and Cleaning of Patient Contact Parts Parts for contact with the patient such as electrodes are not supplied as part of the SynAmps system The manufacturer s instructions should be followed for sterilization and cleaning of the parts used Some devices are designed for onetime use only and no attempt should be made to reuse them whether sterilization has been attempted or not Contact Neuroscan technical support if you have questions about sterilization or cleaning of the SynAmps device or electrodes to be used with the device Repair There are no user serviceable parts in the SynAmps amplifier system Fuses in the System Unit power input module and in the Power Unit power input module should be replaced with the type and rating indicated on the back panel label Contact your dealer or Neuroscan Technical Support if you believe the SynAmps system is in need of repair 12 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Maintenance Neu
9. itis used in such an environment Emissions Test Compliance Electromagnetic environment guidance BE The SynAmps uses RF energy only for its internal function Therefore its RF emissions are very low CISPR 11 and are not likely to cause any interference In nearby electronic equipment ONE Class A CISPR 11 eme A Class 4 IEC 61000 3 2 Voltage fluctuations flicker emissions Complies IEC 61000 3 3 1 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Table ii Recommended separation distances between portable and mobile RF communications equipment and the SynAmps The synAmps is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled The customer orthe user of the SynAmps can help prevent electromagnetic interference by maintaining a minimum distance between portable and mabile RF communications equipment transmitters and the syn4imps as recommended below according to the maximum output power of the communications equipment Rated maximum Separation distance according to frequency of transmitter output power of U transmitter 150 kHz to 80 MHz 90 MHz to 800 MHz 200 MHz to 2 5 GHz d 12 Snn d 12 Snn d 23 sont 0 12 023 For transmitters rated at a maximum output power not listed above the recommended separation distance din metres m can be estimated using the equation applicable to the frequency of the transmitter where Fis the maximum outp
10. multiple devices are connected to a patient or when devices are connected together Leakage currents for individual devices may sum to values higher than expected for single devices In particular care should be taken when connecting Information Technology computer equipment to Medical equipment Allowable leakage current levels for IT equipment are higher than for Medical equipment 13 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Use With HF Surgical Equipment This device does not contain protection against burning of the patient when used with high frequency HF surgical equipment Neuroscan recommends that the SynAmps device not be connected to the patient during use of HF surgical equipment Electrode Safety The SynAmps amplifier inputs and attached electrodes are Type CF which means in part that they are not connected to Earth Ground or Chassis Ground Maintain this separation from Earth Ground by ensuring that the electrodes and any conductive parts of their connectors do not touch conductive parts including the system enclosure or other grounded devices No part of this manual may be reproduced stored in a retrieval system or transmitted in any form or by any means mechanical electronic photocopying recording or otherwise without written permission of Neuroscan No license express or implied is granted with respect to any of the technology described in this manual Neuroscan retains all intellectual
11. noncephalic leads that are galvanically isolated from the patient The HLI ground is connected to the SISO computer ground They are typically used to input analog voltage outputs from peripheral psychophysiological devices where the signal levels are far in excess of standard biologic signals the input range of the HLT s is 5V The HLI s are located on the bottom edge of the headbox 14 pin Redel connector J3 Please refer to HLI section below for pinout and connection information 23 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B The Impedance Threshold Selector lets you select one of six impedance thresholds Impedances in excess of the level you set will be indicated by a lit LED for that channel label The 80 pin connector J2 on the bottom edge of the headbox is for the electrode cap During system checks you must connect the shorting plug in place of the electrode cap The pinout information for your cap is included with the documentation you received with the cap The pinout information for the 80 pin connector is contained in Appendix C 29 pin connector OU pin cap 14 pin Redel connector to system Unit connector for High Level Inputs Connecting Multiple Headboxes The current Quik Caps are wired to send the reference information to all headboxes It is therefore not necessary to connect the ground and reference jacks across headboxes Note Do not apply multiple ground or multiple reference electr
12. operation consists of entering the new values selecting the channels that you wish to modify and then applying the modifications In practice you may find it easier to select the channels then enter the new settings and apply them Either method will work The channel display is used to select the channels that you wish to modify Channels can be selected or deselected by double clicking the mouse on a channel green is selected and red is deselected or Select All lt Deselect All you can use the nd buttons to affect all channels Fp FP A single selected channel will show a white background behind the electrode label x and the label Selected Channel FEI will be displayed in the field You can use the up and down arrow buttons to select a individual electrode or click the mouse button once on an electrode label 34 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B When you have selected the channels that you wish to modify enter the desired Low Pass and High Apply To All Selected Ch la gt Pass filter settings in the Amplifier Settings fields Then click the E button to apply the changes You may verify the changes you have made by clicking an electrode label once and looking at the values in the Amplifier Settings display Click the OK button to return to the main screen in ACQUIRE or click Cancel to leave the screen without applying the changes you have made Range and Accuracy
13. out Hi Level Channel 1 Reference negative Input Signal Ground Signal Ground Signal Ground Signal Ground All peripheral psychophysiological devices should have a common ground among them Precautions We recommend that the following precautions be followed routinely Connect and disconnect the electrodes transducers to the subject with the devices turned ON Be very careful with static charges For example if you are disconnecting an electrode and send a static charge through the system the boards in the SynAmps could be damaged Do not exceed the input voltages described above 45 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Reassignment of Channels It is possible to re map the order in which channels are sampled within a single SynAmps There are several instances in which you might want to do this For example the channel order is defined by the hard wiring in the cap If you list the channels numerically in order of the Physical Channel numbers this might not give you the channel order that you want You can change the channel order by using the Channel Order option or you can remap the channels in the Channel Assignment Table Step 1 Select or create a setup file in ACQUIRE with the total number of electrodes required or go to Edit gt Overall Parameters gt Amplifiers tab to set the number of channels as desired Step 2 Then go to the Channel Assignment Table View Acquisition Option
14. resistor information Pins are soldered as indicated for shorting 174 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B HU E eee alae RER LE ELU ER RER REES RSE rer oO DCD D at LA AL AL LES LOLLO ta UO UO GO UO UO De EE LT NOTO Fe CO CO L OC LAST LE Ca oo RR RT Go COD GO L oi Re Eu i Pin out of the 80 pin connector 5 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B RESISTOR TABLE DIVIDER RATIO 1101 1000 TO 1 2000 TO 1 10000 TO 1 RI SHORT 10 0K 20 0K 100 0 K 76 R2 OPEN 10 OHMS 10 OHMS 10 OHMS SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B
15. to the indicated connectors on the back of the System Unit If you received two System Units connect headboxes 5 8 to the indicated connectors on the back of the second System Unit The two System Units are connected via the acquisition synchronization cable labeled on the back of the System Units The 32 channel version of SynAmps cannot be linked If you have multiple headboxes and you are using a SynAmps Quik Cap from Neuroscan it is not necessary to connect the ground and reference leads across headboxes This is done automatically in the caps The System Units are connected to the SCAN PC by means of two USB 2 0 cables one for each System Unit The first System Unit is connected to the STIM system via the STIM to SCAN trigger cable which connects to the Trigger Input connector on the back of the first System Unit data cables stim to scan Headbox Headbox aS STIM System Di Mi Mi Ray Headhox Headhox 3 ed trigger synch cable Headhox Headhox 7 W power cables data cables as SCAN System Printer Headbox 7 Headhox ZIE CALI System Unit Multi SynAmps Configuration Connect power cables from the Power Unit to each of the System Units The Power Unit contains an isolation transformer and therefore ALL components that will be connected to the system must be 67 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B powered by the Po
16. transformer from line power Input and output voltages are selected via switches All IT Information Technology devices attached to the system must be powered through the Power Unit Follow these steps to connect the components Ventilation 1 The amplifier headbox is connected to the System Unit via a 15 foot cable If you received more than one STIM trigger input amplifier headbox unit there will be a cable for each one One end should be plugged into the headbox connector J1 and the other end should be plugged AmplifierHeadbox connectors into the System Unit Please refer to Appendix B for additional connection information USB 2 connector Make sure the System Unit and SCAN computer are off whenever you connect the USB or headbox cables Do not hot swap the USB cable or headboxes Use the thumbscrew connections to attach the cables securely Inter System Unit connector Power input with switch Back of System Unit 17 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B 25 pin connector SO pin cap 14 pin Redel connector to System Unit connector tor High Level Inputs 2 On the back of the System Unit there is a connector top right for synchronizing acquisition between two System Units please refer to Appendix B for connection information if needed This connector is also involved if you are using the Deblocking option Included with the System Unit is a Deblocking Interface Cable P N 0
17. you will see Update Firmware Version 15 the pa rt numbe r se rial Click here to update firmware Loader Driver Version 01 00 00 number and revision for Main Driver Version 01 00 00 the analog digital and Exit LED boards This ains Channels ac 200 oc fio information may be needed should you need to contact Technical Support M Components Identification Analog board P N S N Rev Trigger test Trigger test provides a way to test the DER Wl Rn Rovi incoming stimulus and response triggers from STIM or other stimulus presentation software Click on the Trigger test button and you will see the Trigger port test display LED board P N S N Rev 53 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Trigger port test Decimal Binary Stimulus bo pooooooo Last Stim jo fooooo000 Response 255 bunn Counter i Hold Value fo Start Stop The Decimal column will show the type code numbers that are sent from STIM The Binary column will show the bits as they change Bit 0 is on the far right side of the display bit 7 is on the far left Click the Start button in the Trigger port test display and start one of the STIM programs so it is sending triggers Stimulus The Stimulus fields display the stimulus trigger type codes received With STIM running you will see brief flashes in the Stimulus decimal and binary fields with each trigger received If you
18. 0081300 One end of the cable connects to the Inter System Unit connector on the back of the System Unit and the other connects to the peripheral device sending the TTL pulse Please see the Triggering section below for more details 3 If you have a STIM system connect the STIM to SCAN trigger cable to the D 25 trigger input connector on the back of the System Unit top left connector see Appendix A for pinout information 4 Connect the USB 2 0 cable to the back of the System Unit and a USB connection on the SCAN computer 5 Connect the power cable to the back of the System Unit and connect the other end to one of the plugs in the back of the Power Unit Note that there is a power switch above the connector on both the System and Power Units turn them off for the time being 18 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B 6 All components connected to the SCAN and SynAmps units MUST be powered by the Power Unit Connect the power cables to the computers monitors printer and System Unit s to the upper power connectors on the back of the Power Unit Make sure you have the input and output voltages set correctly for 115 or 230V Connect the AC power cable from the back of the Power Unit to a grounded AC wall plug Verify that there is a true earth ground in the building otherwise you may experience 50Hz or 60Hz line noise interference in the recordings The completely connected system is shown below Th
19. 00Hz and a high pass at DC The filter tables offer these values at digitization rates at or below 10kHz DC Electrode Considerations The wide dynamic range of the SynAmps amplifier means you should never experience saturation due to electrode DC effects It is still possible for example with dissimilar metal combinations to produce offsets greater than the 200mV amplifier input range The DC capability of the SynAmps amplifier presents special requirements that most electrophysiologists more familiar with AC coupled systems may not have encountered When the amplifier is placed in the DC mode battery potentials generated from electrodes are not dissipated by the decoupling capacitors found in AC only systems Electrode combinations generating battery potentials greater than 200mV will saturate the amplifier Saturation will become evident when the amplifier displays a flat line with no apparent activity If your electrodes show a consistent DC shift that climbs quickly to saturation then your electrodes are not suitable for DC recordings There are several rules to follow when selecting electrodes to avoid these problems 31 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B 1 Never use different combinations of paste gel and or electrodes For example a common error is to use one type of electrode and paste in a monopolar derivation i e electrode cap and gel and a different electrode and or paste on the reference l
20. 065 Revision B The impedance of an electrode or the opposition of AC current flow is the result of the complex interaction between skin electrolyte and electrode Measured impedance will vary according to the transfer function of this junction On the face of the headbox is an Impedance threshold selector Use the lt and gt buttons to select an Impedance threshold The selected threshold will light up Amps caf eeeeoeeed Threshold options include S Ka e Ka E 6 6 2 0 2 5 5 0 10 0 20 0 bl NR ii di and 30 0kOhms If the impedance for a given channel exceeds the threshold that channel on the headbox will light up Impedance threshold selector Step 3 Enter the Threshold and Maximum displayed impedance values The default Threshold value is 5kOhms and the Maximum value is set to 50kOhms To change these click on the Range button and enter the desired values Then click OK Enter AUS E xl 30 7 Threshold kOhmes 5 27 5 Range Maximum kOhms 50 Cancel 24 3 51 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Step 4 Impedance testing will begin when the Impedance screen is displayed The impedance operation uses a 30Hz sine wave The color coded impedances will be displayed for each electrode according to the color of the display Remote Impedance testing You can also test the impedances from the headbox itself without using the Impedance routine in ACQUIR
21. ANYING DOCUMENTS CAUTION Portable and mobile RF communications equipment can affect MEDICAL ELECTRICAL EQUIPMENT Use of this type of equipment in close proximity to the SynAmps should be prohibited If portable or mobile RF communications devices are used in the vicinity of the SynAmps the user or operator should verify normal operation of the device Neuroscan does not specify a minimum amplitude or value of the patient physiological signal CAUTION Grounding continuity should be checked periodically CAUTION This product requires convection cooling Adequate ventilation is required Clearance of 2 minimum on any side ATTENTION Ce product doit tre refroidit par convection Une ventilation appropri e est indespensable Un espace de 2 5cm doit tre laiss libre de chaque c t NOTE USA and Canada Grounding reliability can only be achieved when this equipment is connected to a receptacle marked Hospital Only or Hospital Grade REMARQUE USA et Canada la fiabilit de la mise a la masse de cet Equipment ne peut tre r alis que si celui ci est connect une price marqu e Hopital Suelement ou Classe H pital 11 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Environment The SynAmps is designed to be used in a clinical laboratory or office environment Extremes of humidity temperature or pressure should be avoided The device should not be used in a location where contact with liquids
22. E You need to at least open the ACQUIRE program however Then press the Start button on the headbox the same as the lt button and the electrode labels should light up assuming their impedances are greater than the value set with the indicator Set the indicator to the desired Threshold for example 5kOhms The electrode lights will turn off as the channel impedance goes below the threshold To stop impedance testing remotely press the Stop button gt and hold it for at least two seconds to turn off the impedance function at the headbox Diagnostic and Related Information Edit View Acquisition Options 4 To access some diagnostic and other information click Edit gt SynAmps2 Overall Parameters Hardware Channel Layout Channel Assignment Table Make default setup Subject Synamps2 Hardware 52 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B The SynAmps2 Hardware Setup dialog box will appear Synamps2 Hardware Setup x DLL Version 1 0 Amplifier If you have multiple amplifier headboxes connected select m Amplifier the one that you wish to see Select Amplifier Number h d Info Info This option returns information about hardware versions in the oy eee Info amplifier headbox and is used for diagnostic purposes only Trigger tes Click here to test tri t Test xj With your amplifiers eee es rasi Firmware 7 connected
23. Gegenwart von entzundbarer Anasthetikummischung mit Luft oder mit Sauerstoff oder Stickstoffoxid PELIGRO Riesgo posible de explosion cuando se usa cerca de un anestesico inflamable mezclado con aire con oxigeno o con oxido nitroso PERICOLO Possibile rischio di esplosione se utilizzato in presenza di una miscela di gas inflammabile ed aria oppure ossigeno o protossido d azoto This device is not equipped with appropriate alarms required for use in monitoring clinical parameters of a patient where it is necessary to alert the user of situations which could lead to death or severe deterioration of the patient s state of health WARNING The SynAmps system should not be used adjacent to or stacked with other equipment If adjacent or stacked use is necessary the SynAmps system should be observed to verify normal operation in the configuration in which it will be used WARNING Connection to the High Level Input Connector J3 on the headbox REF 00080460 may result in increased EMISSIONS or decreased IMMUNITY of the SynAmps system Care should be taken 10 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B by the user or operator to verify normal operation with a cable attached to the High Level Input Connector CAUTION MEDICAL ELECTRICAL EQUIPMENT needs special precautions regarding EMC ElectroMagnetic Compatibility and needs to be installed and put into service according to the EMC information provided in the ACCOMP
24. SynAmps User Manual P N 00080650 Compumedics Neuroscan USA Ltd 6605 West W T Harris Blvd Suite F Charlotte NC 28269 USA Phone 877 717 3975 8am 5pm EST Internet sales neuroscan com techsup neuroscan com www neuroscan com AAA COMPUMECICS Neuroscan 1 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B For Technical Support If you have any questions or problems please contact Technical Support through any of the following routes If you live outside the USA or Canada and purchased your system through one of our international distributors please contact the distributor first especially if your system is under warranty In all other cases please use techsup neuroscan com or see the other Support options on our web site http www neuroscan com Or if you live in the USA or Canada please call 1 800 474 7875 International callers should use 877 717 3975 For Sales related questions please contact your local distributor or contact us at sales neuroscan com Copyright 2007 Compumedics Neuroscan All rights reserved Printed in the United States of America No part of this manual may be used or reproduced in any form or by any means or stored in a database or retrieval system without prior written permission of the company Making copies of any part of this document for any purpose other than your own personal use is a violation of United States copyright laws For information c
25. System Unit The duration of the TTL pulse should be no longer than the duration of the artifact data are lost during the Positive span in which deblocking is employed The Deblocking pulse must return to the original response bit resting state typically 5V between pulses In other words the default condition uses negative logic and deblocking will occur when the TTL pulse goes to OV If you select the Positive option the system will use positive logic That is the resting state is 0 and deblocking will occur when the TTL pulse goes to 5V Post Trig ms 33 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Amplifier Settings The Filter characteristics of the SynAmps2 are controlled selected Channel from the Amplifiers SN2 options under Edit gt Overall Parameters These ff settings are stored with the setup file for ACQUIRE Thus if you change a a particular setting on the amplifier you must resave your setup file if you want 200 these values to reappear the next time you run the system The SynAmps2 EVEN E receives these values prior to acquisition If the values have not changed then 4 29 90 LSR it will begin data display immediately If however the values have changed ou then new values will be downloaded and there will be a brief delay while this Low pass 200 Hz OCCUTFS High pass IDC These fields allow you to set the Filter settings for the individual amplifier channels The basic
26. The safety and electromagnetic compatibility of this system was tested with the following accessories parts and associated devices The user or operator is cautioned to ensure that when using accessories parts or associated devices other than those listed that the safety and electromagnetic compatibility of the system is maintained 1 Neuroscan SCAN Computer P N 0010915 or 0010914 2 Headbox Cable P N 00080586 3 Deblock Interface Cable P N 00081300 Classification per IEC601 1 1988 The device is ordinary equipment not protected against ingress of water and should not be used in the presence of any spilled liquids It is not designed to be suitable for use in the presence of a flammable anesthetic mixture of air and oxygen or nitrous oxide The device is capable of continuous operation Class and degree of protection against electrical shock is Class 1 Type CF Technical Description Input 120 230VAC 50 60Hz 10 5A Fuses T5A 250V 2 each 5 X 20mm Headbox Weight 1 5 kg Dimensions Height 4 5 cm Width 18 7 cm Depth 21 8 cm 6 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B System Unit Weight 4 3kg Dimensions Height 23 0 cm Width 11 6 cm Depth 32 5 cm Power Unit Weight 12 5kg Dimensions Height 23 0 cm Width 11 6 cm Depth 32 5 cm Shipping and Storage Maximum Limits 20 C to 70 C 10 to 100 humidity non condensing RH 500 hPa to 1060 hPa After unpacking allow devices to a
27. an a device that just shorts the pins together please see Appendix E for details Step 2 Click on the Calibration item under Acquisition Ampnsyn E x from the Acquire main menu or click the Cal icon from the Toolbar You will see a reminder to attach the shorting plug s AN Attach shorting plug to headbox es and press OK i Cancel Step 3 The Calibration Check operation will then begin You will see progress bars as the AC and DC functions are checked Then the Pass Fail results will appear If you have multiple amplifiers check each one of them E Amp Ho 1 channel 1 2 3 4 5 6 T 8 AC PASS PASS PASS PASS PASS PASS PASS PASS DE PASS PASS PASS PASS PASS PASS PASS PASS 9 10 11 12 13 14 15 16 PASS PASS PASS PASSO PASS PASS PASS PASS PASS Pass PASS PASS PASS Pass Pass PASS If you encounter Failed channels there are several things you should try 48 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B 4 Di Verify that the shorting plug s was indeed installed Remove and replace the shorting plug making sure it is securely connected If all channels from one headbox fail and you have more than one headbox try swapping the shorting plugs and see if the failed channels follow the plug Verify that the headbox cable connections are secure on both ends If you have multiple headboxes try swapping them and see if the failed channels follow the headbox or not Ma
28. den impulses movement artifact causing the subsequent smoothing of the impulse consequently these amplifiers saturate and need an external reset circuit to restore the system Second a DC recording can always be refiltered with different high pass values Digital filtering can be applied to the data to examine the effects of different high pass values This is not 30 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B true however if the data have been acquired with an AC coupled system You will have to accept whatever high pass values were originally used to sample the data In addition digital filtering provided in both EDIT and ACQUIRE modules can offer sharper frequency cutoffs without the phase shift of an analog filter The available filter values for the SynAmps2 were selected to encompass a broad range of filter settings that are often employed in neurophysiology For example short 10 milliseconds latency evoked potentials such as the auditory brainstem evoked response are often recorded at high digitization rates with a low pass of 3 5kHz and high pass of 150Hz Examination of the tables below under Filter Values shows that a low pass of 3 5kHz is available for the highest digitization rate To take the other extreme long seconds latency cortical responses such as the motor potential or the contingent negative variation are often recorded with low 200 or 500Hz digitization rates with a low pass below 1
29. djust to room temperature for at least two hours prior to interconnection and application of power Operational Limits 15 C to 30 C 25 to 95 humidity non condensing RH 700hPa to 1060hPa pressure Warnings and Precautions Instructions Read instructions before operating the device Symbols The following symbols are found on the SynAmps SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B ZN CAUTION Read instructions before using ATTENTION Lire le mode d emploi avant usage VORSICHT Vor Verwendung Gebrauchsanleitung lesen PRECAUCION Lea las instrucciones antes de su uso ATTENZIONE Leggere le instruzioni prima dell uso CLASSIFICATION Class 1 Type BF CLASSFICATION classe 1 type BF KLASSIFIZIERUNG Klasse 1 Typ BF CLASIFICACION Clase 1 Tipo BF CLASSIFICAZIONE Classe 1 Tipo BF Subject connection is isolated Volts AC Volts DC from power mains Type CF 8 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B L a G System Unit Headbox Unit Signal Input D e Patient Connected Patient Not Connected USB Connection The SynAmps operates using line voltages which are present inside the enclosure and so is marked CAUTION To reduce risk of electric shock do not remove cover Refer servicing to qualified personnel ATTENTION pour reduire tout risque de choc electrique ne pas oter le couvercie S adresser a un technician qualifie en cas de mauvais
30. e Power Unit contains an isolation transformer that is rated up to 1000 watts While that should be sufficient to safely power the components mentioned you should verify that you are not surpassing that limit A fully loaded System Unit with four amplifier headboxes attached consumes a maximum of 150W The demand will come primarily from your computer s monitor s and any peripherals The wattage demands are usually displayed on the back of the components or in their documentation Neuroscan is not responsible for damage to the Power Unit resulting from an overload Note Install the SCAN software prior to turning on the SynAmps amplifiers 19 Outputs limited to 1000A total Output Voltage selector 115 or 230 Input Voltage selector 115 or 250 Fuses On Off switch Power Connector SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B 7 After all of the components are connected turn on the Power Unit the System Unit s and the SCAN computer The SynAmps amplifiers should be found as the computer boots and the next step is to install the drivers for them If you have installed the software first the drivers will be found more automatically SynAmps lt Dat amplifier Se cables STIM Audio SE SCAN PC Response pad Installing the SynAmps Drivers When you connect the System Unit to the SCAN computer or when the SCAN computer first boots after you have co
31. e pad only uses the first 4 Looking at the back of the SCAN connector the 4 additional bits are pins 17 20 carrying bits 7 4 respectively Response pin 17 bit 7 is used for Deblocking This pin is connected to the Inter System Unit connector and it is that connector that is used for Deblocking with the Interface Cable provided P N 00081300 The TTL signals should be at least 2 5V and not more than 5V The pulses must return to the original response resting voltage typically 5V between pulses 61 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Pinout summary In list form the SCAN side connector and pinouts are as follows Note that pins 14 and 15 carry 5V DC 1 System Unit Connector D25 Male Metal Shell AMP or equivalent 2 Mating connector D25 Female Metal Shell AMP or equivalent 3 Pinout 1 Trigger In 07 11 Undefined 21 Response In 03 2 Trigger In 06 12 Undefined 22 Response In 02 3 Trigger In 05 13 Undefined 23 Response In 01 4 Trigger In 04 14 5VDC 24 Response In 00 5 Trigger In 03 15 5VDC 25 Ground 6 Trigger In 02 16 Undefined 7 Trigger In O1 17 Response In 07 8 Trigger In 00 18 Response In 06 9 Undefined 19 Response In 05 10 Undefined 20 Response In 04 Matching Port Logic The logic used to trigger your system can be either positive or negative Positive logic is defined as a transition from the zero state ground to a one state 5 Volts TTL Negative logic is defined as a tran
32. ead By using different metals and electrolytes a battery potential has been created and the electrodes will drift If you have the same electrode materials and gel and you are still experiencing saturation then double check your electrodes They may not be made out of identical material Measure the DC voltages across these leads and you will find a large offset potential 2 Keep the interface between the skin and electrode consistent For example with an electrode cap the interface with the skin is a nonconductive rubber and the conductive gel The gel makes contact with the electrode If you place a reference electrode directly on the subject s skin for a reference you have created a different interface You now have a gel plus metal to skin interface The best way to avoid this problem is to obtain a separate but identical electrode to employ as a reference Another technique is to separate the metal from the skin with an adhesive electrode collar Note drift problems with the reference electrodes in multichannel recordings are usually observed across all monopolar derived electrodes 3 Select metals that are known to produce the smallest battery potentials Sintered Ag AgCl electrodes are probably the best We have also found tin electrodes to be acceptable They will produce more drift but the drift is monotonic and can be corrected using the DC offset transform in the EDIT module of SCAN 4 The DC level is relatively independent of the e
33. ed by the Up and Down arrows on the Toolbar and the scalar value is 2 then the display will be multiplied by a factor of 4 The scalar setting affects the screen display only and has no effect on the stored data The Default value is the value displayed on the Channel Layout display a Custom value you enter for the Display Scalar will override the value set on the Channel Layout display Filtering The default state is disabled since in most cases you do not want to filter the HLIs If you enable the Filtering option then whatever filtering you assign to the HLI channels under Overall Parameters gt Amplifiers will be applied to the HLIs Be careful doing this since in most cases you do not want to filter the analog voltage output from the peripheral device If you select the default Disable option this will override any filter settings that were made on the Amplifiers page and no Filtering will be applied Leave it disabled for this example Reset Defaults Click the DEMO button to return the fields to the default settings mV a Scalar of 1 and Disabled Filtering 43 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B DC Output Some transducers require a DC voltage in order to operate The Voltage Out SynAmps is capable of producing a differential output That is it has a positive negative and ground output The voltage on the output is always symmetrical about the ground e g 5 and Enable Amp 5V
34. fonctionnement VORSICHT Zur Vermeidung der Stromschlaggefahr die Abdeckung nicht entiemen Wartungsarbeiten sind nur von geschultem Personel vorzunehmen PRECAUCION Para reducir el riesgo de que se produzca un electrochoque no retire la tapa Consulte a personal cualilicado para efectuar el servicio ATTENZIONE Per ridurre il rischlo di scossa elettrica non rimouvere il coperchio Rivolgersi a personale qualificato WARNING For continued protection against fire hazard replace fuse with same type and rating AVERTISSEMENT pour une protection permanente contre les risques d incendie utiliser des fusibles de rechange du meme amperage 9 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B WARNUNG Zur Wahrung des Schutzes gegen Feuergefahr Sicherung nur durch eine Sicherung desselben Typs und derselven Leistung emeuem ADVERTENCIA Para obtener una proteccion continuada contra el riesgo de incendio reemplace el fusible con uno del mismo tipo y potencia ATTENZIONE per una protezione continuativa contro rischi di incendio sostituire il fisible con uno dello stesso tipo e voltagio DANGER Possible explosion hazard when used in the presence of a flammable anaethetic mixture with air or with oxygen or nitrous oxide DANGER Risque possible d explosion en cas d utilisation en presence d un melange d anesthesique inflammable et d air d oxygene ou de protoxyde d azote GEFAHR Mogliche Explosionsgefahr bel Verwendung in
35. g of ES a 9 8 7 6 S 4 3 2 STIMPins 9 8 7 3 i 9 ut 12 13 amp 600000000606 14 15 16 17 18 19 20 21 22 23 24 25 SG Li dh k KE D si a D Ru do do eng GND 25 21 22 23 24 SCANPins STIM Pins 21 20 19 18 25 GND 3 2 1 0 Response Bits Response Bits 26 5 43 2 2 0 Back of STIM Connector Back of SCAN Connector 60 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Stimulus pins The stimulus pins with SynAmps work slightly different from SynAmps and NuAmps With SynAmps2 the TTL pulses from the stimulus presentation system do NOT have to return to zero voltage between pulses For example you could send TTLs of 1 bit 0 then immediately add bit 1 to give a 3 and then add bit 3 to give a type code of 11 without ever returning the bits to zero The exception is when you have a series of events that are the same such as 1 1 1 In that case the voltage must return to zero between TTL pulses It is also possible to have access to the TTL offset time as well as the onset time Response pad pins On the back of the STIM connector the response pad lines are 21 20 19 and 18 carrying response bits 3 2 1 and 0 On the back of the SCAN connector the response pad lines are 21 22 23 and 24 carrying response bits 3 2 1 and 0 There are actually 8 response pad bits that can be used for additional responses although the STIM respons
36. g the same task Listed below are some of the main features e A USB 2 0 interface is used to link the SynAmps and computer This single connection serves up to four headboxes for a total of 256 EEG channels plus additional bipolar and HLI channels via a single System Unit A second System Unit can be used for more channels depending on your computer s speed and the AD rate e Real time digital filtering provides a wide range of filter settings from DC to 3 5kHz e Sampling rates up to 20kHz from 1 to 64 EEG channels on a single headbox Sampling rate is independent of the number of headboxes attached to a system e 64 monopolar 4 bipolar and 2 high level input channels A high density connector on the headbox is provided for quick connection to electrode cap arrays e Amplification and acquisition in the headbox near the subject to reduce noise pickup e Built in impedance and system checking e 24 bit AD conversion provides greater resolution using the 32 bit SCAN 4 3 acquisition software 15 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Hardware Installation Installation of a SynAmps amplifier is very easy Here is a summary of the installation steps Unpacking the SynAmps The SynAmps2 has been shipped in containers designed to reduce damage due to shipping Please retain these boxes and their contents in case you need to return the system for any reason The three main components Amplifier headbox Sy
37. ge software to interpret the voltages from the external devices in a meaningful way The Input Range is the Gei 0 0 voltage range that will be input into the amplifiers Valid voltages are between 5V The Display Range is the High E 15 range of values that will be displayed on the screen in ACQUIRE To continue the example we said that the analog voltage output of the pupillometer ranges from 0 to 5V where OV Omm and 5V 15mm Enter the values as shown in the Scaling section Setup Overrides Display Units You can set the Units displayed on the Y axis aS needed to make them meaningful for the HLI data Se IS The Default units are the autoscaled nV uV mV etc To change it enter whatever units are meaningful in the field Reset Defaults for example enter mm or psi Note the labels Display Unite Display Scalar Filtering W Disable 42 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B should not contain any spaces and there is a 10 character maximum Display Scalar The Display Scalar is the same at the Scalar seen in the Channel Layout dialog screen Step 6 These settings allow you to alter the display scaling factor specifically for the HLI channel s thus increasing or decreasing their amplitudes in relation to changes in the other EEG channels The scalar multiplies the global scale factor For example if the global scale factor is 2 the number displayed on the Status Bar and affect
38. go testing to verify its compatibility with Windows XP Tell me why this testing is important Continuing your installation of this software may impair or destabilize the correct operation of your system either immediately or in the future Microsoft strongly recommends that you stop this installation now and contact the hardware vendor for software that has passed Windows Logo testing ela STOP Installation Click Finish to complete the installation Found New Hardware Wizard Completing the Found New Hardware Wizard The wizard has finished installing the software for e Neuroscan USB 2 0 Loader Click Finish to close the wizard lt Back Cancel 22 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B The Amplifier Headbox Each amplifier headbox connected to a Impedance threshold SynAmps provides 64 monopolar 4 selector bipolar and 2 high level inputs channels The amplifier headbox unit also provides amplification AD conversion filtering and other signal processing 4 000090 The 64 monopolar channels are laid out in an 8x8 grid on the face of the headbox and are labeled numerically The four bipolar channels contain the plus and Bipolar channel inputs minus poles The differential or bipolar inputs are used for EOG EMG and EKG channel recordings 4 94481 6 n a s 200 L B B L l 9 ki E The High Level Inputs HLI s are
39. hannel 41 30 Bipolar 4 56 Channel 28 05 Patient Ground 31 Channel 23 57 Channel 52 06 Reference 32 Channel 31 58 Channel 60 07 Channel 18 33 Channel 55 59 Channel 05 08 Channel 26 34 Channel 63 60 Channel 13 09 Channel 50 35 Channel 24 61 Channel 37 10 Channel 58 36 Channel 32 62 Channel 45 11 Channel 19 37 Channel 56 63 Bipolar 3 12 Channel 27 38 Channel 64 64 Bipolar 3 13 Channel 51 39 Spare 65 Channel 22 14 Channel 59 40 Spare 66 Channel 30 15 Channel 04 41 Channel 17 67 Channel 54 69 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B 16 17 18 19 20 21 22 29 24 25 26 Channel 12 Channel 36 Channel 44 Bipolar 2 Bipolar 2 Channel 21 Channel 29 Channel 53 Channel 61 Channel 06 Channel 14 42 43 44 45 46 47 48 49 50 51 52 Channel 25 Channel 49 Channel 57 Channel 02 Channel 10 Channel 34 Channel 42 Channel 03 Channel 11 Channel 35 Channel 43 70 68 70 71 72 73 74 75 76 71 78 79 80 Channel 62 Channel 07 Channel 15 Channel 39 Channel 47 Channel 08 Channel 16 Channel 40 Channel 48 Spare Spare Spare Spare SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Appendix D Guidance and Declaration Table Guidance and manufacturer s declaration electromagnetic emissions The SynAmps system is intended for use in the electromagnetic environment specified below The customer or the user of the SynAmps system should assure that
40. increase the pulse duration in the STIM software to for example 100ms you will see the triggers somewhat more clearly The type code number will flash in the decimal field and the activated bits will flash in the binary field 54 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Last Stim The Last Stim fields will show the type code in decimal and binary of the most recently received trigger Response The Response decimal field will show the inverted value of the response pad triggers i e 255 Pressing the response pad buttons should show decimal values of 254 253 251 and 247 corresponding to buttons 1 4 and type codes of 1 2 4 and 8 respectively The binary field will be all 1 s until a button is pressed then the corresponding 1 will become a O uses the 4 columns on the right side of the display Counter The Counter will show the accumulated number of stimulus and response triggers received Hold Value The Hold bit pattern value determines what value of the signal at the trigger port will initiate a sweep a value other than the Hold value will trigger acquisition With new STIM systems the Hold value should be zero If you see a different value please contact Technical Support If you have an older LabMaster STIM system and do not see any triggers with a Hold value of zero you need to invert the trigger codes Do this by entering 255 for the Hold value from the keyboard you will also need to clic
41. itization rate of the ACQUIRE system is too short and the program misses some short duration trigger pulses in continuous mode only Solution The digitization rate that is set in the Acquisition values screen of your setup file determines what should be the minimum duration of the trigger pulse generated by STIM or another device The dwell time is defined as 1 digitization rate This value should be larger than the trigger pulse duration If it is smaller then ACQUIRE may miss some trigger pulses as a result of sampling error Cable 1 2 3 Problem The wrong type of cable is being used Solution Use only the STIM to SCAN cable between the SynAmps and the STIM Audio System 1 2 3 Problem The cable may be damaged internally 64 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Solution If ACQUIRE is not receiving pulses at all or if the numbers coming across do not correspond to those that are being sent out from the STIM computer then the cable may be at fault Test the continuity of the leads using the pinouts shown above 1 2 3 Problem The cable is not plugged in completely Solution Press firmly on the connectors at each end to insure that they are securely in place 1 2 Problem The cable is not plugged into the right port on the SCAN system or on the STIM system or other device Solution Be sure that you have the cable plugged into the port that you think you have it plugged int
42. k the Use Inverted values field under Edit gt Overall Parameters gt Triggers see Triggering section below If you still do not see triggers contact Technical Support 55 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Press the Stop button to stop registration of the triggers and press the Done button to exit Trigger port test To use Trigger test diagnostically the STIM system should be turned on Trigger port test B with the stim to scan cable connected Go to Trigger test and click the Start button You should see the values shown Decimal Binary Stimulus T 0000000 In its resting state note that the Stimulus bits are at zero and the Last Stim fo foooooo00 Response bits are held high all 1 s Summing the 8 response bits gives Response Jos bunn the 255 Decimal value The Hold Value should be 0 trey EC DUET If you see for example one or more of the stimulus bits held high 1 Hold Value fo that will cause all other incoming triggers to be ignored no triggers A gei Se workaround is to take whatever number it shows in the Stimulus field and enter that as the Hold value For example if the 4th bit is stuck 8 enter 8 as the Hold value The events seen in ACQUIRE will be altered accordingly this is a temporary workaround until the real problem is repaired The cause could be a problem in the STIM box the stim to scan cable or in the SynAmps2 With other stimulus sy
43. ke sure nothing else is connected to the headbox If the problem persists contact Technical Support External System Check You can verify the accuracy by performing an external System Check in which you input a known signal from a signal generator through the BNC connector on the back of the shorting plug Please contact Tech Support for details before attempting this techsup neuroscan com Impedance Electrode impedances can be checked at any time while the subject is connected to the headbox Monopolar inputs 1 64 and bipolar positive inputs B1 B4 leads are measured against the ground lead The negative leads of the bipolar channels are compared to the positive leads Impedance values are displayed in color form at each electrode Follow these steps to check electrode impedance Step 1 Place leads on the subject with standard electrode application techniques 49 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B cine Options Tools Windo D Start Acquistion Ctrl Step 2 Click the Impedance doc option under Acquisition from the Main Menu bar or click the Impedance icon Z The Impedance display screen will appear E v e n milo ME P lle SE RIA ICE ejg m 8 K Is N at S 6 di aN 8 vw O Q 2 z i gt S amp fei IG mu a x R 7 start 54 scan 4 3 ra 50 SynAmps2 Copyright 2007 CM NS Document Number 8
44. lectrode impedance If you have set your electrode impedances to the standard 5kOhms or less and your electrode is still drifting additional work on the impedance will usually have no effect except on the subject Since the primary source of battery potentials is the interface between the gel and electrode and not the skin further work on the gel to skin interface will probably not help This is a good time to 32 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B replace the electrode or examine the metal to wire solder joint another potentially large source of battery potentials 5 Record in a comfortable and cool environment Sweat potentials can be a major problem for DC recordings They produce transient and unpredictable results Deblocking The Deblocking feature should be enabled to reduce stimulus artifact such as SEP stimulation artifact You must be in DC Mode to use Deblocking Deblocking essentially suspends acquisition for a typically brief span of time For example deblocking can be used to suspend acquisition during the few ms s in which an SEP stimulus artifact is present Set the deblock time in the Post Trig ms field Deblocking is controlled by a TTL signal sent from the peripheral device to the p Deblocking System Unit using the Deblocking Interface cable P N 00081300 included with the System Unit package This cable connects to the Inter System Unit M Enable 40 connector on the back of the
45. mance Do NOT add a second subject ground A ground loop could result thus introducing 50Hz or 60Hz noise in the recordings 58 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Electrode Safety The SynAmps amplifier inputs and attached electrodes are Type CF which means in part that they are not connected to Earth Ground or Chassis Ground Maintain this separation from Earth Ground by ensuring that the electrodes and any conductive parts of their connectors do not touch conductive parts including the system enclosure or other grounded devices MRI Environment Recording Configurations The SynAmps2 is part of the MagLink RT system that used to record EEG with the MR chamber Both the system unit and all headboxes must be outside of the MR chamber in the control room See the MagLink RT manual for more details 59 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Appendix A Trigger Port Interfacing The method of triggering between the SCAN and STIM systems is to connect the Parallel I O ports on the back of the SCAN and STIM interfaces by means of a STIM to SCAN cable This cable is provided to customers who purchase STIM systems A STIM to SCAN cable is a 25 line cable with a female connector at the end marked SCAN and a male connector at the end marked STIM Below is a diagram of the connections within a STIM to SCAN cable Teeger OR ea ero D te 7 6 5 4 3 2 1 O0 TriggerBis BA Le le PM ete S
46. n if you are using one and click OK You will then see the SCAN 4 3 AmpInst screen Click lt lt Back to select a different amplifier or click Finished 25 Select an amplifier NuAmps Quicktrace Amp Simulator I Video Camera SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B The program takes a fraction of a second to run it is creating or SCAN 4 3 Amolnst modifying the scan43 ini file in the WINDOWS directory PPS Selected Amplifier To verify that the computer and amplifiers are communicating correctly please do the following Sum 2 Make sure that the software lock provided with the SCAN CD is i ne Finished connected to the USB port or parallel depending on the type of lock you received on your computer E Double click the SCAN 4 4 icon SGANA and then click on the ACQUIRE icon Launcher to start the ACQUIRE program from the Program If you enabled the Video Device option you will be asked to select the device you are using Click the pull down list to select the camera and click OK 26 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Video Source Capture Source dicrosoft eng CS Select a Video Device The Main screen will appear Acquire File Edit View Acquisition Options Tools Window Help o P elu mite tH y earH loc v 4 ZtTalA AS e s co 27 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B
47. n the SynAmps2 other than the AC coupling in AC mode is performed by a program running on the host computer The nature of these digital filters is dependent on coefficients sent down from the host system Selecting different filter values determines the coefficients and consequently the filter characteristics of the system Listed below are the current low pass High frequency cutoff values installed in the SynAmps Low pass Filters Low pass filter values are dependent on the Ligtization Kate Hz digitization rate The upper end of the low pass 20K 10K SK ZE LE 500 250 200 100 filter is set to about 1 5th of the current Se SE SS BS ER a SC P Ge digitization rate so that data are five times 40 an 40 40 40 40 40 40 oversampled The digitization rate is set in the 50 50 50 50 50 En En Amplifiers tab under Edit gt Overall 70 op op op 70 70 Parameters Potential low pass filter values are 100 100 100 100 100 100 30 40 50 70 100 200 500 1000 1500 200 200 200 204 200 2000 2500 3000 and 3500Hz The maximum Fan 796 1000 low pass value available to the user will be at 1500 1500 least 1 5th of the current digitization rate For 2000 2000 example the maximum value for a digitization 2500 rate of 1000Hz would be 200Hz Listed below are 3005 the low pass filter values available at each digitization rate Note At cutoff frequencies the voltage gain is L same for 5K same for 1 Z5K approximately 6dB except
48. nes may not apply in all situations Electromagnetic propagation is affected by abzonpion and reflection from EE objects and people land mobile radios amateur radio Ah and FM radio broadcast and TY broadcast cannot be predicted theoreticalhy with accuracy To assess the electromagnetic environment due to fixed RF transmitters an electromagnetic site survey should be considered tf the measured field strength in the location in which the SynAmps is used exceeds the applicable RF compliance level above the SynAmps should be observed to verify normal operation F abnormal performance is observed additional measures may be necessary such as reornenting or relocating the SynAmps Overthe frequency range 150 kHz to 80 MHz field strengths should be less than 3 Wim 3 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Appendix E Shorting Plug Details The shorting plug for SynAmps2 is 1 not wired the same as that use with SynAmps and 2 provides functions in addition to shorting the pins together The primary use of the shorting plug is for use with Calibration Checks The shorting plug must be inserted in the cap connector when performing a Calibration Check 100hm shorting impedance is applied within the plug The BNC connector on the back of the plug is used to inject a signal from an external signal generator to all amplifiers in the headbox The diagrams below show the shorting method the connector pinouts and the
49. nnected the SynAmps Windows will find the new hardware Each headbox unit and each System Unit has its own drivers so the process below will be repeated several times If you subsequently change the order of the headboxes Windows will detect the change and the drivers will need to be installed again The entire installation of all of the drivers will take several minutes once done you will not need to do it again unless you change the headbox order 20 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Select the Install the software Found New Hardware Wizard automatically option the relevant drivers used by SynAmps are Syn2Ldr sys and SynAmps2 sys Click Next and the drivers will be installed Welcome to the Found New Hardware Wizard This wizard helps you install software for Neuroscan USE 2 0 Loader If your hardware came with an installation CD or floppy disk insert it now Found New Hardware Wizard j Please wait while the wizard installs the software What do you want the wizard to do Neuroscan USB 2 0 Loader Install from a list or specific location Advanced Click Next to continue Back Cancel Cancel 21 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B When the following message appears click Continue Anyway B The software you are installing for this hardware Neuroscan USB 2 0 Loader has not passed Windows Lo
50. nything in the surrounding area of your laboratory that can generate an electromagnetic field Any device with a large electric motor centrifuges freezers elevators large fans or transformers X ray machines is a potential problem Also check to make sure that you have a good and quiet ground connection within your building A high quality milligauss meter can be used to measure these fields 38 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Triggering All event marking and triggering on the SynAmps are managed by a special parallel port located on the back panel of the System Unit This parallel port is identical to the parallel port used by previous SCAN interfaces To make connections to this port the reader is referred to Appendix A Voltage Triggering is not an option with SynAmps2 External Triggering When interfacing with the STIM system select the External External option In most circumstances the Hold value will be zero EES Whether you Use inverted values or not depends on several things FRE 0 With new systems you generally do not need to invert the triggers If you do not see any triggers in Acquire or if you are using an older LabMaster STIM system try it with the Use invert values option checked i Use inverted values High Level Inputs In years past it was possible to input psychophysiological signals from peripheral devices such as GSR EKG respiration amplifiers directly into
51. o On the SCAN side it plugs into the back of the SynAmps in the Trigger port On the STIM side it plugs into the back of the STIM Audio System in the Trigger port Neither end plugs into a PC Solution It is recommended that you plug the cable directly into the ports instead of running it through a switching unit Port 1 Problem The port may have a static charge built up in it or some other temporary defect Solution If the cable seems to be intact and the software is configured correctly then the port itself may be causing the problem Sometimes a port gets into a temporary state in which it will not function for the purpose of triggering This state can be corrected by powering down and then powering up the SynAmps2 65 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B General 2 3 Problem The SCAN system and the STIM system or other stimulus generating device may be connected to different power supplies resulting in a ground loop Solution Connect the SCAN system and the STIM system or other stimulus device to the Power Unit If these steps do not resolve the trigger problem refer also to Appendix C in the Installation and Orientation manual 66 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Appendix B Configuring Multiple SynAmps Configuring multiple SynAmps2 headboxes is a fairly easy operation Each System Unit powers up to four headboxes Connect units 1 4
52. odes just because there are multiple headboxes Note You should ALWAYS connect the reference electrode to the subject 32 Channel Version The 32 channel version of SynAmps has the same appearance as the 64 channel version The difference is that monopolar channels 33 64 have been disabled The four bipolar and two high level input channels are fully functional All of the acquisition capabilities are the same as the 64 channel version The only difference aside from the number of channels is that you cannot link 24 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B the 32 channel version with another 32 channel version or with a 64 channel version It is possible to upgrade the 32 channel version to a 64 channel version at a later time should you decide to do so This will require a return to the factory The 32 channel version has labels on the front and back saying it is a 32 channel system Installing the SynAmps as the Amplifier for SCAN After you have installed the driver for the SynAmps2 you need to install SynAmps as the amplifier used in the SCAN software This is done by running the ampinstall exe program If you do not have the AmptInst icon H your desktop go to the Scan4 3 folder and double click on the BB Ampinst exe program or run the program from Start gt All Programs gt Scan 4 4 The SCAN 4 3 Select an Amplifier window will appear Select SynAmps 2 enable the Video Camera optio
53. ontact Compumedics Neuroscan Compumedics Neuroscan USA Ltd 6605 West W T Harris Blvd Suite F Charlotte NC 28269 Phone 877 717 3975 8am 5pm EST E mail techsup neuroscan com Web www neuroscan com 2 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Table of Contents Devi e ur EE 5 UE EE 15 Hardware JInstallanon ii 16 Unpacking the SYnAMPS ire 16 Connecting the Components ss 16 Installing the SynAmps Driver 20 iii I ee 23 Connecting Multiple Headboxes ii 24 Installing the SynAmps as the Amplifier for SCAN 25 Configuring the SynAmps in the ACQUIRE Program 29 EE RR O es ee eee eee ee 29 DC Electrode SUS E 31 BO i SR E A A E E E A 33 aile 36 Reer a en a EEN 36 wel el 9 ee a nrar E EEE 37 PE iiei RA 37 i ee E VAI 39 a E a ne E de ee 39 Reassignment of Channels eee ee eee eee 46 KEE Re ETA 47 pc AO A 49 3 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Diagnostic and Related Information ss 52 e EE 58 lei GO E 59 MRI Environment Recording Confguratons sss eee ee e eee ee ee 59 Appendix A Trigger Port Interfacing eee e 60 Appendix B Configuring Multiple SvnAmpSs 67 Appendix C Electrode Cap Connector Pinout sese ee eee 69 Appendix D Guidance and Declaration ss 71 Appendix E Shorting Plug Details ss 74 4 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Device Classification A
54. property rights associated with the technology described in this manual This manual is intended to assist application developers in the use of applications for Neuroscan SynAmps data acquisition system Even though Neuroscan has reviewed this manual NEUROSCAN MAKES NO WARRANTY OR REPRESENTATION EITHER EXPRESS OR IMPLIED WITH RESPECT TO THIS MANUAL ITS QUALITY ACCURACY MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE IN NO EVENT WILL NEUROSCAN BE LIABLE FOR DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM ANY DEFECT OR INACCURACY IN THIS MANUAL even if advised of the possibility of such damage 14 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Introduction The Neuroscan SynAmps are AC DC amplifiers designed to record a wide variety of multichannel neurophysiological signals The SynAmps are intended for the researcher who needs both a broadband amplifier and a high speed digital acquisition system A SynAmps contains the analog components needed to amplify low level neurophysiological signals and the digital components needed to digitize digitally filter log external events and transfer data to a host computer This design allows for high speed acquisition of signals from multiple electrode sites This distributed processing approach allows data to be acquired at much higher rates with greater precision from more channels than could be obtained from a single computer performin
55. rameters are set in Edit gt Overall Parameters gt Amplifiers SN2 Amplifier Settings A D Rate The maximum AD rate with SynAmps is 20kHz for any number of AJD Rate 500 channels The SynAmps2 AD converters over sample by 64x making the effective Sampling rate greater than 20 kHz However for the digitized data the maximum rate is 20kHz Click the pull down arrow to see the available AD rates Number of Channels Enter the total number of desired channels including any Number of Channels bipolar and HLI channels 69 Reset Positions A setup file is provided for each cap with preset channel assignments to match the cap Therefore you do not need to create the complete setup file it is usually easiest to modify an existing setup file if your recordings differ from the preset channels If you have the 32 channel version of SynAmps you will get an error message if you enter a value greater than 38 32 monopolar four bipolar and two high level input channels for the Number of Channels AC DC option With SynAmps you have the option to record in true DC AC DC mode or to record in AC mode With the AC mode enabled a decoupling L AC of DC 29 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B single pole RC high pass filter 05Hz 6dB octave pole is switched into the signal path This filter will remove most problems associated with battery potentials generated by electrodes On some AC coupled s
56. roscan suggests that the earth and patient leakage currents be tested at least once per year to ensure continued safe use of the device Also at least once per year visually inspect the device including the power cord Replace any worn or frayed cables and contact your dealer or Neuroscan technical support if you have concerns about what you see This inspection interval may be shortened for devices that are moved often or experience unusually heavy use Periodic calibration of the device using internal or external sources is recommended The calibration procedure is described in the Calibration section below No other maintenance or service is required Installation Precaution Proper grounding is important for continued safe use of your SynAmps system Ensure that the outlet supplying power to your SynAmps is grounded and that the power cords supplied with your system are used Other devices in the same patient area should be at the same ground potential and should preferably use the same branch circuit See the Hardware and Software Installation directions below for more details Power Source Characteristics The SynAmps amplifier is designed produced and tested to ensure reliable operation when connected to power systems having normal variability If you believe that your power system may experience excessive noise or variability Neuroscan recommends use of a power conditioner Interconnection with Other Devices Care should be taken when
57. s To Overall Parameters Channel Layout Channel Assignment Table Step 3 Double click the channel field labeled Phys and enter the channel Phys Label number that will result in the order that you want channel 1 reassigned to ER EES channel 10 in the example below In this example channel 10 will now have physical channel 1 Repeat this step until all desired channels have 2 2 01 been reassigned 3 3 DE Step 4 Click OK to assign the channels 4 4 PE 5 5 P4 Step 5 Save the setup file to make your changes permanent Note If channels are to be deleted be sure to remove them before assigning channels 46 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Similarly you may want to select only some of the channels to use For example let s say you have a 64 channel cap but you only want to record the basic 10 20 system electrodes From the documentation you received with the cap or from a setup file that matches your cap you can see which physical channels carry which electrodes Select the 10 20 channels order them as you wish and save the setup file Be sure to set the desired number of channels in the Amplifiers tab first Note that if you have more than one headbox you must use all of the channels from the first headbox if you plan to use some or all of the channels from the second headbox Similarly if you have more than two headboxes you must use all of the channels from
58. sition from the one state to the zero state The SynAmps employs positive logic on the stimulus port and negative logic on the stim pad response port Note the STIM response pad lines must be held to positive levels during the resting state or the device will not respond If not connected these lines are pulled up to high levels Because SynAmps2 uses positive logic on the stimulus port the numbers received by the trigger port from older 100kHz based STIM systems identified by the two large ribbon cables exiting the back of the 62 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B computer labeled J6 and J11 need to be inverted back into positive logic to match the SynAmps2 This is accomplished by the Use inverted values option in Acquire under Setup Edit Triggers see Acquire manual In general if trigger codes do not match i e a 1 generates a 254 then the Use inverted values option should be used Troubleshooting If you encounter problems with triggering there are a number of procedures that you can follow to determine the cause of the problem Most triggering problems are simple to correct Listed below are some common causes of triggering problems and instructions on how to correct each one A complete list of potential trigger problem sources is found in Appendix C of the Installation and Orientation manual or overview manual The most common problems are listed first If you are having triggering
59. sition the HLI displays Example Let s say you are using the supplied Synamps2 Quik Cap64 ast setup file in the SynAmps2 folder for SynAmps and you want to add a HLI channel to record pupil diameter The analog voltage output of the pupillometer ranges from 0 to 5V where OV Omm and 5V 15mm 1 Retrieve the setup file The most recently retrieved setup file will always be loaded when you enter ACQUIRE 2 Click the Amplifiers SN2 tab In the Number of Channels field Number of Channels enter 69 in place of 68 69 Reset Pasitions 3 Go to Edit gt Channel Assignment Table and scroll to Wa ve pp the bottom of the list In this case the 69th channel was assumed to be a HLI channel that is the next unassigned Di DI channel in the display LE ee Sp HL 6 HI HEO EKG EG DI 40 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B 4 Double click the 69 in the channel Label column and enter HL eo Hi Diam a new label such as Diam Then click OK to leave the Channel Assignment Table 5 Go to Edit gt Channel Layout You may not see the new Diam Spacing electrode display If not the position is out of the display area Click F d A Adiust Positions and try clicking the down arrow for Spacing to collapse the electrode displays vertically In this case the Diam is found well below the others Drag it to the range of the others and use the Spacing up arrow to ret
60. stem Unit and Power Unit are packaged in smaller boxes within the larger box As you remove the components from the boxes examine them for any obvious damage due to shipment Save the boxes in case you need to return the SynAmps for repairs Open the boxes and check for the following contents 1 Amplifier headbox unit s 7 Isolation Power Unit 2 Amplifier headbox cable s 15ft 8 SynAmps User Manual 3 Cap Connector Shorting plug s 9 Power Unit Manual 4 System Unit s one for every four headboxes 10 Warranty Card 5 USB cable s 15 ft 11 Declaration of Conformity 6 Deblocking Interface Cable Connecting the Components The Amplifier Headbox provides the interface into which patient electrodes may be connected and contains amplification and data acquisition circuits The amplifier converts the analog biological signals to digital ones and sends the data to the host computer It performs electrode impedance measurements and system checks 16 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B The System Unit serves as an interface between the Headbox and the host computer as well as providing distribution of power controls and data to multiple Headboxes Additionally the System Unit provides user access to functions such as input triggers synchronization signals and other user interface functions The System Unit is line powered through the Power Unit The Power Unit provides isolation through a
61. stems connected you might see all response bits at 0 or maybe the four left bits at 0 They all need to be high in the resting state Then it is a question of whether you want to record responses or not If you do not want responses then you should not plug anything into those pins on the trigger connector in the back of the System Unit pins 17 24 The natural resting state of the SynAmps2 is high so they will be OK If you do want responses they must use inverted logic where the resting state is high and the trigger pulse goes to zero If pins 17 20 are zero clip whatever lines are going into those pins they are not needed for responses but they do need to be held high 56 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B To help isolate the cause of abnormal bits disconnect the stim to Trigger port test EN scan cable or other trigger cable if you do not have STIM from the back of the System Unit Start Trigger port test and you should see Decimal Binary the following values Stimulus 255 bam All of the bits should be high If any are at zero that points to a Een EE hum problem in the SynAmps and a probable return to your local service Femme Ee hnn center If this looks normal connect the stim to scan cable to the SynAmps and disconnect it from the stim box It should still look Counter fi like the picture above If it does not there is a problem in the cable DEE gt If it still looks normal
62. the SynAmps headbox assuming the voltages were attenuated to physiologically normal levels This practice however can create safety issues in certain situations such as in a hospital setting where a patient is connected to multiple devices and where grounded metal may be within reach In other situations problems may arise between fixed grounds used by the other devices and the SynAmps floating ground at the headbox Consequently psychophysiological signals arising from peripheral devices should only be connected through the High Level Inputs HLIs on the bottom edge of the SynAmps2 The HLIs are isolated from the patient connections The HLI ground is connected to the System Unit ground computer ground There are several places in the ACQUIRE program that are relevant for configuring the HLIs These include the Amplifiers SN2 options under Edit gt Overall Parameters the High Level Inputs 39 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B options under Edit gt Overall Parameters the Channel Assignment Table and Channel Layout We will use an example to describe the various settings shortly Briefly the various dialog screens are used as follows Amplifiers SN2 select the number of channels including the HLIs set Filtering for HLIs if any High Level Inputs main area for configuring the HLIs Channel Assignment Table used to select the HLI channels Channel Layout used to size and po
63. then the problem is likely on the STIM side When you are testing for triggers in ACQUIRE using the Single start Siop Window display to see the triggers in a continuous file be sure you have NOT enabled the Use inverted values field in the setup file Edit gt Overall Parameters gt Triggers 07 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Update This option is used to update the Firmware on the EEPROM in the amplifier headbox Do NOT attempt to use this unless so directed by Technical Support Selecting the option Pierik displays the following screen Use the Browse button to locate the headbon bst new headbox bst file Then click the Update button and you will see the progress of the file transfer Progress Status idle Total blocks Current Block Stop Update Cancel Subject Ground The subject ground should be placed as close as possible to the recording electrodes Under most circumstances this location is somewhere on the head The subject ground is used to reject common mode noise Therefore by placing the ground near the recording electrodes the common mode rejection ability of the amplifier is optimized Avoid placing the ground at distal sites arms and legs An older technique often used to reduce stimulus artifact was to place the ground near the stimulating site This procedure should not be used on the SynAmps2 and doing so will degrade system perfor
64. under Edit gt Overall Parameters 60 Hz Frequency 60 Hz 50 Hz Interference Here are a few quick things to check if you have significant interference in your data 37 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Impedance of leads Impedances of all leads should be below 5kOhms Impedance of ground lead It is important that a solid ground lead be placed on the subject The ground lead is used by the amplifiers to reject common mode interference such as 50 and 60Hz main frequencies Double check this lead to be sure it is securely attached Power cables Make sure that there are no power or video cables near the subject or the headbox cable Although signals coming from the headbox are amplified draping a power cable over the headbox or headbox cable will produce interference Monitors Video monitors are now a common device in the neurophysiological laboratory Unfortunately they can also be a serious source of interference Most monitors radiate more from the sides than the front If you suspect interference from your monitor try moving the orientation of the screen It should vary with orientation Another clue that a monitor is emitting noise is a clear pulse with an interval corresponding to the refresh rate of the screen i e 16 667ms for a 60Hz refresh rate It should be noted that the newer low radiation monitors have significantly reduced noise radiation Other noise sources Watch out for a
65. urn to the original positions 6 Click OK to return to the Channel Layout screen You will then see the new electrode display for the HLI channel Size and position it as desired Note you may set the display Scalar here if needed or in Step 8 below Then click OK to exit the Channel Layout 7 Return to the Amplifiers SN2 options and you will see the new HLI channel in the channel display If you want to apply a filter to the HLI channel select the channel and set the filter as desired In most cases you will NOT want to filter the HLI Apply a filter only if you are Sure you need to do so 8 Next click the High Level Inputs tab For this example we will assume you have a single amplifier if you have more than one the process is the same just select the amplifier containing the HLI that you are configuring 41 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Channel Select the HLI channel to be configured SIE Di If you have multiple amplifiers chained together a Label you will see HLIs for all of the amplifiers HL1 HL2 HL3 HL4 etc Label Label is the electrode label that you entered in Step 5 The Default label is the one you entered at that point You can change it by entering a new Label This will override any previous label you entered Scaling Input Range Display Range The Input Range and Input P ange Display Range fields are used to configure the SCAN WOLTS Display Han
66. ut power rating of the transmitter in watts WV according to the transmitter manufacturer MOTE 1 At OU MHz and 800 MHz the separation distance for the higher frequency range applies NOTE Z These guidelines may not apply in all situations Electromagnetic propagation is attected by absorption and reflection from structures objects and 2 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Table D Guidance and manufacturers declaration electromagnetic immunity equipment sho ad be used no dozer To any part of the Syn4mpe system induding cables than the recommended separation distance calculated from the equation applicable to the frequency of the transmitter Recommended separation distance Conducted RF 3 rms 3 Wime a 1 27 sqt if IEC 61000 4 6 150 kHz to S0 MHZ 150 kHz to 80 MHz Radiated RF 3 Mim 3 Mam d 1 27 sqrt 6180 MHz to S00 MHZ IEC64000 4 3 20 MHz t 25 GHz 80 MHz a 25 GHz Jd 255 sqrt Py S00 MHzt25 GHz where P is the maximum output power rating of the transmitter in watts C according to the transmittermanufacturer and 0 is the recommended separation distance in metres mi Field strengths from fixed RF transmitte rs as determined by an electromagnetio site survey should be less than the compliance level in each frequency range Interference may occurinthe vicinity of equipment make d with the following symbol igher frequency range applies NOTE 2 These guideli
67. wer Unit This includes the STIM and SCAN PCs their monitors the STIM audio box and any peripherals such as a printer The isolation transformer is rated up to 1000 watts While that should be sufficient to safely power the components mentioned you should verify that you are not surpassing that limit The System Unit headbox and STIM Audio System Unit each draw less than 10 watts The demand will come primarily from your computer s monitor s and any peripherals The wattage demands are usually displayed on the back of the components or in their documentation Neuroscan is not responsible for damage to the Power Unit resulting from an overload Lastly connect the Power Unit to a three prong wall receptacle with a verified true earth ground If there is not a true earth ground you increase the potential for line noise interference 68 SynAmps2 Copyright 2007 CM NS Document Number 8065 Revision B Appendix C Electrode Cap Connector Pinout Located on the side of the headbox is an 80 pin connector that can be used to connect to predetermined electrode arrays Shown below are the pinouts for this connector 1 Headbox connector 3M 80 Position 0 050 MDR Connector P N N10280 52E2VC 2 Mating connector 3M 80 Position 0 050 MDR Wiremount P N 10180 6000EC 3 Pinout Pin Signal Pin Signal Pin Signal OI Channel 01 27 Channel 38 53 Bipolar 1 02 Channel 09 28 Channel 46 54 Bipolar 1 03 Channel 33 29 Bipolar 4 55 Channel 20 04 C
68. ystems high pass values below 1Hz are often available as an approximation to DC If you are interested in slow potentials there is no need for these values since the SynAmps is a DC coupled system The advantages to recording slow potentials with a DC high pass are two fold First DC amplifiers are less prone to impulse artifact The recovery time of an AC coupled system actual or simulated as is the case on the SynAmps2 can be described by the time constant of the system The time constant is the time needed by an amplifier to decay to 37 of the peak response to a sudden impulse To calculate the time constant of a simple filter use the following formula where T is the time constant and f is the cutoff frequency This formula can be used to determine the effects of high pass filter values on your d recordings For example if the amplifier encounters an impulse artifact with a T 0 01Hz high pass filter it will require 16 seconds before the system returns to 37 Demi f of the original amplitude If you are using such a filter setting so as to approximate DC we strongly recommend that a DC value be employed The DC setting is insensitive to impulse artifact The SynAmps is not affected by even the most substantial of artifacts such as those generated by somatosensory and magnetic stimulators when recording in the DC mode AC coupled systems that employ long time constants such as 01Hz can be very unstable and are highly susceptible to sud

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