UBA-4204 User`s Manual - LKC Technologies, Inc.
Contents
1. Function Prototype Arguments Returns Notes int StartContinuousData void None Error codes as specified in Section 6 1 This function initiates on going data acquisition Data sent by the NewHorizon amplifier are stored in the allocated circular buffer Data are retrieved from the circular buffer by calling GetNextData During continuous data acquisition the only Page 25 of 30 Function Prototype Arguments Returns Remarks Function Prototype Arguments Returns Actions Notes commands that may be executed are StopContinuousData and GetNextData int StopContinuousData void None Error codes as specified in Section 6 1 Data already placed in the circular buffer during data collection can still be retrieved even after data collection is stopped int GetNextData float Data Data pointer to the next sample from all channels from which data were gathered Error codes as specified in Section 6 1 1 Determines if at least one sample is available in the circular buffer If not returns Data Not Ready 2 Determines if buffer has overrun i e write pointer has overwrit ten read pointer and returns Buffer Overrun 3 If data are available copies one value for each channel sampled and places it into Data Data can still be retrieved to the end of the circular buffer even af ter data collection is stopped 6 6 Impedance Measurement Before using this function you must call OpenAmp and2. 4 4 where and refer to the non inverting and inverting inputs respectively Page 15 of 30 45 Battery Charging The UBA 4204 Amplifier Unit is powered by an internal rechargeable Lithium ion bat tery A fully charged battery will allow you to collect data continuously for up to 12 hours The required time to recharge a fully depleted battery is 8 hours with 80 of the charge restored within the first 4 hours Note If the battery is fully depleted unit will not turn on recharging the battery for 10 minutes should provide enough charge to operate the unit for approximately 12 hour Battery Charge Indication The LED next to the Battery Check symbol on the front of the UBA 4204 indicates the remaining amount of battery charge d 4 Battery Check Symbol LEDs Illuminated Battery Charge Remaining Hours Green gt 30 96 23 Green Red 10 30 96 1 3 Red 10 96 lt 1 Recharging the Battery Do not charge the battery while the UBA 4204 Amplifier Unit is connected to a patient Insert the Battery Charger Power Supply connector into the Amplifier Unit directly below the DC Power symbol DC Power Symbol Plug the power cord into a wall outlet or isolation transformer The Battery Charger Power Supply can be used with inputs from 100 240 VAC 50 60 Hz 46 Replacing the Battery The battery is designed to withstand approximately 5 000 discharge cycles As you ap proach this number the operatin
3. 1 8 TABLE OF CONTENTS SAFETY SECTION Pop 4 1 1 WARRANTY NFORMAT ON E UT p i 4 1 2 CONTACT INEORMATION 5 EIER Ee CER EUER ERIS Tee 5 1 3 PRECAUTIONS 5 1 4 6 1 5 reb et e Dee aem ect e deceret EORR 7 1 6 EUROPEAN REPRESENTATIVE 7 1 7 PRODUCT INTRODUCTION onana nnn taaa nnne a nasa A asas asas asa asas asas asas asa sa a asas asas asas a 7 1 8 SPECIFICATIONS eee te tee aA ie zt ace Reve eae iade vao E 9 1 9 SOFTWARE ICENSE ciae ea pone eue nba ce Sene Mace 9 1 10 RECALIBRATION AND MAINTENANCE cccccccceccecseeecsececeeeseseceeeceeeeseeseseseseeseeeeessesseeeeeeseeuseeuenees 9 PARTS ACCESSORIES AND CONFIGURATIONS e eene eee e eene eese tnos ete ene sette ense eee ene ee ete 10 SETTING UP THE UBA Vete Tr 11 3 1 PRODUCT INTERCONNECTION 11 3 2 INSTATIEA brevet rtc ei eset eva 12 USING THE UBA 4 204 13 4 1 POWERING seen ic d r A A Ar 13 4 2 SINIT 13 4 3 4200G INTERFACE UNIT cene ea eb eed e terre e e needed 14 4 4 INPUT CONNECTIONS 35 2 treedectete cles be c oed ed reete e e 14 4 5 BATTERY CHARGING narraire ele aa A U detected entree eire ter eai e rete ed 16 4 6 REPLACING THE BATTERY
4. Model UBA 4200 Interface Unit USB A to B Cable 2 m Dual Channel TOSlink Fiber Optic Cable Battery charger power supply with power cord User s Manual CD Rom with Software Storage Box Lanyard p m LR m Lm m xv Page 10 of 30 3 Setting Up the 3 1 Product Interconnection Inputs Amplifier fusa Unit Interface Unit TOSlink KC Cable USB Cable to computer UBA 4204 Interconnection Diagram Power On _ To Amplifier USB PORT 4200 Interface Front View UBA 4200 Interface Back View Connect one end of the TOSlink fiber optic cable to the data port on the UBA 4204 Amplifier The data port is identified with a symbol The con nector will only insert in one orientation Connect the other end of the TOSlink fiber optic cable to the data port on the Model 4200 Interface Connect the USB cable to the Model 4200 Interface Connect the other end of the USB cable to any USB port on your computer If desired clip the lanyard to the loop near the electrode connections on the UBA 4204 amplifier The lanyard may be placed around a person s neck to support the UBA 4204 during recording sessions That s it You re done Page 11 of 30 3 2 Driver Installation e When the USB cable from the Model 4200 Interface is plugged into your com puter the Windows operating system will recognize that a new USB device has been connected The Fo
5. 500 Hz 1 95 uV 0 65 uV 0 37 uV 2000 Hz 4 2 uV 1 5 uV 0 65 uV 7500 Hz 7 3 uV 2 4 uV 1 2 uV 5 4 Effects of Digitization Rate on Frequency Response Because of the digitization and filtering process of the ADCs the frequency response of the UBA is dependent on the sampling rate The response is given approximately by r SELI dur LI 3 0 1 92 384 5 76 7 68 Frequency KHz Frequency MHz where f is the sampling rate The response of the system for f 30 000 Hz is shown in the graphs below ain dB 3ain dB G nr G For frequencies greater than f 2 the frequency at which aliasing becomes a concern the input is attenuated by at least 20 dB for frequencies greater than 3 f 4 the input is at tenuated by at least 60 dB There are additional windows of sensitivity centered at 1 92 MHz 3 84 MHz etc In most circumstances no additional anti aliasing filtering should be nec essary However if you expect signals in the MHz range to appear at the amplifier inputs external filtering may be required to prevent aliasing Page 19 of 30 5 5 Input Impedance The input impedance of the UBA 4204 15 always greater than 10 However at lower sampling frequencies the input impedance can be significantly higher Values are shown in the table below Sampling Fre Input Imped quency ance 1 000 Hz 10 1000 Hz 20 60 Hz 500 Hz 40 MQ lt 50 Hz
6. 80 MQ 5 6 Digital Filters The UBA DLL contains functions to implement digital high pass low pass and notch filters The filters are implemented as Infinite Impulse Response second order But terworth filters For the non technical this means that the filters will affect the data in a manner very similar to a hardware filter Filtering only applies when you are collecting a fixed number of sam ples For continuous data collection you must implement your own fil tering routines Page 20 of 30 6 Introduction to the UBA4204 DLL Functions In August 2009 LKC released Version 2 of the UBA DLL We strongly rec ommend that users of the earlier Version 1 DLL upgrade to the new ver sion This manual discusses only the Version 2 DLL and associated soft ware 6 1 General Information Errors All functions return an error code The error codes are given in the table below ur Interpretation 0 No error or Data ready 1 Unable to communicate with amplifier 2 Invalid parameter value specified 3 Unused 4 Not all parameters have been set 5 Amplifier is busy continuous data collection 6 Data not ready 7 No data collection in process 8 Memory not allocated see section 6 5 1 9 Not in continuous data collection mode 10 Buffer overrun 11 Manufacturing commands not enabled 15 Other error Data All data collected by the UBA are expressed in microvolts uV as a floati
7. SetAmpParams Function Prototype Arguments Returns Notes int MeasureImpedance int Current int Freq float Impedances Current Value of current to put through the electrodes Valid values are 3 10 WA 2 2 WA 1 0 5 uA Freq Mains frequency Valid values are 50 60 Impedances Pointer to array in which impedance values will be stored Error codes as specified in Section 6 1 Data are reported only for the channels that are enabled by SetAmpParams 6 7 Calibration Before using this function you must call OpenAmp and SetAmpParams Function Prototype Arguments Returns Actions Notes int AmpSelfCalibrate void None Error codes as specified in Section 6 1 Waits until self calibration is complete to return Self calibration takes approximately 3 sampling intervals e g about 3 msec if the UBA is set to 1000 Hz sampling rate The am Page 26 of 30 plifier cannot be used during the time that the amplifier is perform ing a self calibration 7 Interfacing with your software Windows application programs controlling the UBA4204 amplifier must utilize the pro vided Dynamic Link Library DLL 7 1 Important notes e The function OpenAmp should be called once at the beginning of your program The function CloseAmp should be called once before exiting your program e The function SetAmpParams can be called at any time before initiating data col lection Because this function tak
8. exceeds the channel ca pacity as described in Section 5 2 If the channel capacity is exceeded bytes of transmitted data will be dropped resulting in corrupted data 3 High Pass Low Pass and Notch filtering apply only when collecting a fixed number of samples For continuous data collection you must implement your own digital filtering routines 6 4 Functions to Collect a Fixed Number of Samples Before collecting data using these functions you must call OpenAmp and SetAmpParams Function Prototype int CollectDataWait void Arguments Returns Actions None Error codes as specified in Section 6 1 1 Verifies that all parameters for data collection are properly set 2 Allocates sufficient memory to hold the data freeing any pre viously allocated memory Page 23 of 30 Notes Function Prototype Arguments Returns Actions Notes Function Prototype Arguments Returns Actions Remarks Function Prototype Arguments Returns Actions Notes 3 Initiates collection of data from headend and storage in the al located buffer 4 Waits until all data are received before returning Data are left in the allocated buffer on completion and must be retrieved by the GetChannelData function for each channel int CollectDataNoWait void None Error codes as specified in Section 6 1 1 Verifies that all parameters for data collection are properly set 2 Allocates sufficient memory t
9. gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt A note about passing Pointers from VB to VC GetChannelData requires chan as long data as single which for data requires a pointer in the form of a long It is important to note that passing BYREF DATA does not work you have to pass ByVal the actual POINTER You get the pointer from VB by using the following undocumented commands VarPtr Data 0 You also have to reference only the first item in the array VarPtr Data does not work Page 27 of 30 1 lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt Private Declare Function SetAmpParams Lib UBA4204 dll ByVal ptrParameters0 As Long As Long Private Declare Function CollectDataWait Lib UBA4204 dll As Long Private Declare Function CollectDataNoWait Lib UBA4204 dll As Long Private Declare Function DoneYet Lib UBA4204 dll As Long Private Declare Function GetChannelData Lib UBA4204 dll ByVal Chan As Long ByVal ptrData0 As Long As Long Private Declare Function StartContinuousData Lib UBA4204 dll As Long Private Declare Function StopContinuousData Lib UBA4204 dll As Long Private Dec
10. phone letter FAX or e mail any problem you may be experiencing Page 4 of 30 1 2 1 3 Contact Information LKC Technologies Inc Customer Service Support 800 638 7055 US amp Canada 1 301 840 1992 Worldwide 1 301 330 2237 FAX Service LKC com www LKC com Precautions Ensure the amplifier battery is fully charged prior to use Do not record from human subjects while the Amplifier Unit battery is recharging Use only the provided battery or an exact replacement from LKC Technologies Use only the provided battery charger power supply or an exact re placement from LKC Technologies This device is not protected against the ingress of water and should not be used in the presence of liquids that may enter the device This device is not suitable for use in the presence of flammable anes thetics or other flammable vapors or liquids Page 5 of 30 1 4 Symbols Caution Read instructions before using Patient connection is isolated from power mains European Union Council Directive compliance Battery Check Data I O Port TOSlink cable eL AB gt DC Power Battery charger power supply connection C Power On 0 Power Off Self Test Page 6 of 30 1 5 Approvals This product has been tested for EMI and complies with the requirements of EN 60601 1 1 2 2001 Group 1 Class A device under CISPR 11 Use of this equipment in the vicinity of other equipment with excessive EMI may interfere
11. OUR SOFTWARE 6 csscsssssssssssssssscscssssssscscccccsssssssccecccesscsssscscceses 27 7 1 IMPORTANT NOTES ve aen beer eet eee ee e eR E eS ED Ee E eee 27 7 2 REFERENCING THE UBA4204 DLL IN YOUR CODE 27 7 3 USING THE UBA4204 DLL TO COLLECT A FIXED NUMBER OF SAMPLES ee 28 7 4 USING THE UBA4204 DLL FOR CONTINUOUS DATA COLLECTION eee eene 29 UTILIZING THE UBA4204 DLL WITH MATLAB AND 30 Page 2 of 30 8 1 8 2 MATLAB LABVIEW Page 3 of 30 1 Safety Section 1 4 Warranty Information LKC Technologies Inc unconditionally warrants this instrument to be free from defects in materials and workmanship provided there is no evidence of abuse or attempted re pairs without authorization from LKC Technologies Inc This Warranty is binding for one year from date of initial delivery and is limited to servicing and or replacing any instrument or part thereof returned to the factory for that purpose with transportation charges prepaid and which are found to be defective This Warranty is made expressly in lieu of all other liabilities and obligations on the part of LKC Technologies Inc DAMAGE UPON ARRIVAL Each instrument leaves our plant after rigorous tests in perfect operating condition The instrument may receive rough handling and damage in transit The shipment is insured against such damage The Buyer must report in writing immediately an
12. Scale Range Resolution 1 2 000 V 0 24 uV bit 2 1 000 V 119 nV bit 4 500 mV 60 nV bit 8 t250mV 30 nV bit 16 t125mV 15 nV bit 32 t62 5 mV 7 5 nV bit 64 31 25 mV 3 7 nV bit Considerations for gain settings using the AC coupled UBA The AC coupled version of the UBA 4204 will not respond to DC offsets at the input Thus the buffer gain should be set as high as possible to maximize the resolution of the system 5 2 Maximum Sampling Rate The UBA 4204 s maximum sampling rate depends on the number of channels used Maximum ama Sampling Rate 1 15 000 Hz 2 3 7 500 Hz 4 3 750 Hz 5 3 Effects of Digitization Rate and Preamp Gain on Input Noise Page 18 of 30 The UBA 4204 utilizes one bit Analog Modulator that digitizes at a rate of 1 92 MHz This digitized data is averaged in hardware to produce lower data rates As a result of the UBA s digitization process slower sampling rates produce significantly lower Equivalent Input Noise EIN For best noise performance you should select the slowest sampling rate that is compatible with accurate reproduction of your signal The EIN increases ap proximately as the square root of the sampling frequency Some examples of EIN as a function of digitization rate and buffer gain are shown in the table below Equivalent RMS Input Noise Digitization Preamplifier Gain Rate 1 8 64 50 Hz 0 63 uV 0 22 uV 0 12 uV
13. apacity 8 hours to 100 0 C to 55 C 32 F to 131 F 534 x 3 x 1 14 6 cm x 8 3 cm x 2 5 8 oz 225 g including battery Software License The UBA driver software is a copyrighted product of LKC Technologies Inc and is in cluded with UBA 4204 system under the following license agreement The software may be used in conjunction with the UBA 4204 system only The purchaser of the UBA 4204 may make copies of the software for con venience of use provided the LKC copyright notice is preserved with each copy This license specifically prohibits the use of this software in a sys tem that does not include an UBA 4202 Interface Unit 1 10 Recalibration and Maintenance The digitizer of the UBA 4200 series biomedical amplifier is designed with a stable in ternal voltage reference that should not drift significantly with time We recommend that the calibration of the unit be verified every 3 years The UBA 4200 series biomedical amplifier does not require routine maintenance Should the internal rechargeable battery need to be replaced see the instructions in Sec tion 4 6 The UBA 4200 series amplifier headend can be cleaned if needed with a cloth damp ened with a mild detergent solution Do not immerse the amplifier in any cleaning solu tion as it is not watertight Page 9 of 30 2 Parts Accessories and Configurations The UBA 4204 15 shipped with the following components Model UBA 4204 Amplifier Unit
14. bVIEW Any other system that allows you to access a DLL driver o 9 Page 8 of 30 1 8 Specifications AMPLIFIER UNIT INTERFACE UNIT Input Type Analog Differential or Single Ended Computer Interface USB 1 1 Input Channels 4 user selectable Power Source USB powered Input Impedance Connector Type Background Noise CMRR Frequency Range Input Gain DC Input Range Stability Accuracy Calibration Data Resolution Sampling Rate Data Connection Safety Power Source Battery Charger Operating Time Recharge Time Environmental Size Weight 1 9 210 MQ Size 6 x 3 x 24 1 5 mm Male DIN Safety electrode connections or 15 em x 7 6 cm x 5 7 optional BNC connectors Weight 8 oz 225 g 0 7 uV p p 100 Hz Sampling Rate 10 KO Input lt 1 8 uV 1000 Hz Sampling Rate 10 KO Input gt 100 dB at 50 60 Hz AC Coupled with a frequency range of 0 1 Hz to 15 kHz 1 2 4 8 16 32 64 user selectable 2 V Gain 1 lt 250 nV C drift lt 0 2 absolute Nonlinearity lt 0 0010 Automatic gain and offset calibration on demand 0 25 bit Gain 1 to 3 7 nV bit Gain 64 2 5 Hz to 15 kHz Bidirectional fiber optic cable TOSlink to Interface Unit lt 1 nA Leakage Current gt 4 kV Isolation when operated according to instructions Rechargeable Li Ion Battery 100 240 V 50 60 Hz 12 V 1 0 A included Up to 12 hours of continuous use before recharging 4 hours to 80 c
15. cation Using External Code in LabVIEW available at http www ni com pdf manuals 370109a pdf describes the process of interfacing a DLL to LabVIEW Please refer to this document to develop your UBA 4204 interface for LabVIEW Page 30 of 30
16. es several hundred milliseconds to execute it should be called well in advance of when you want to start data collection AllocateBuffer should be called once for continuous data collection the allo cated buffer will be re used on subsequent calls to StartContinuousData Make sure to call FreeBuffer when you are done 7 2 Referencing the UBA4204 DLL in your code The first step in using the UBA 4204 in your custom software is to include a refer ence to the DLL and the routines that you will be using This includes definitions of the functions that you will call within the UBA DLL Examples for several common languages are shown Visual C To use the DLL with Visual include the UBA4204 LIB and UBA DLL h files included on the CD ROM into your project Visual Basic 6 0 Because the default methods that Visual Basic and C use to pass parameters to functions are very different the declarations to use the UBA DLL in Visual Basic are somewhat complicated The declaration for each function is shown below Please also read the Note about passing pointers from VB to VC in the section below START UBA DLL DECLARES 1 lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt gt lt
17. g time per recharge will decline If you need a battery replacement you have two options 1 Return the amplifier unit to LKC Technologies where trained personnel will install a replacement battery Battery replacement is not covered under war Page 16 of 30 ranty Please contact LKC Technologies Customer Support before returning your amplifier for this service 2 Replace the battery at your facility Please contact LKC Technologies to pur chase a replacement battery To replace the battery Remove the four screws from the back panel of the Amplifier Unit and remove the back panel Disconnect the battery s 2 wire connector from the amplifier printed circuit board and remove the battery from the unit Attach the connector to the new battery aligning similar color wires on the connector and battery Remove the protective strip from the Velcro attachment and carefully place the battery onto the back panel Replace the back panel and carefully reinsert and tighten the four Screws Use only a genuine replacement battery from LKC Technologies Use of other batteries may be hazardous Lithium lon Batteries should be carefully disposed of Contact your local government for disposal or recycling practices in your area Page 17 of 30 5 Considerations for Use 5 1 Gain Selection The Full Scale Range and Resolution of the system are shown for each preamplifier gain in the table below Buffer Gain Full
18. hee bove eec treten rere eed 16 CONSIDERATIONS FOR USE 18 5 1 CZ WW D eri e RR 18 5 2 MAXIMUM SAMPLING 18 5 3 EFFECTS OF DIGITIZATION RATE AND PREAMP GAIN ON INPUT NOISE eeee 18 5 4 EFFECTS OF DIGITIZATION RATE ON FREQUENCY RESPONSE ccce eene 19 5 5 INPUT IMPEDANCE tree mete cestode be tee e P perc ci os Bee sane 20 5 6 DIGITAL EIETERS intended RN 20 INTRODUCTION TO THE UBA4204 DLL FUNCTION SG sscccsssssscsssssccssssccsssssecssssscesees 21 6 1 GENERAL INFORMATION s efe sese eee ete sees eee rte ete e ee Le EO Le E Dc NES 21 6 2 STARTING AND ENDING sieves oce tette exe ee ord a eee esee et bud 21 6 3 SETTING AMPLIFIER PARAMETERS ccccccssesecesececececesesesecececececececeeeeececeseceeececeeeeesecesesececeeeeesess 22 6 4 FUNCTIONS TO COLLECT A FIXED NUMBER OF SAMPLES eee eee eene nnne n nnne 23 6 5 CONTINUOUS DATA GCOLTECTION sees eene eee eee dete eee ee ete rece ee ee Le exu 25 6 5 1 MEMORY ALLOCATION AND MANAGEMENT 25 6 5 2 DATA COLLECTION ete reset O te iade ee pita red ica ec 25 6 6 IMPEDANCE MEASUREMENT ccccccccccccscscscscscscscscscesssscssssesesssscscsssssssssssssssssessssssssusssssusseusssueues 26 6 7 CALIBRATION cccccccccccccscccscscesesesecesecessesseesssesesssescssscscsessssusucusscssscssesesucssussseeseusueususesusueusesusuenas 26 INTERFACING WITH Y
19. lare Function GetNextData Lib UBA4204 dll ByVal ptrData0 As Long As Long Private Declare Function AllocateBuffer Lib UBA4204 dll ByVal NSAM As Long As Long Private Declare Function FreeBuffer Lib UBA4204 dll As Long Private Declare Function Measurelmpedance Lib UBA4204 dll ByVal Current As Long ByVal Freq As Long _ ByVal ptrimpedances0 As Long As Long Private Declare Function AmpSelfCalibrate Lib UBA4204 dll As Long Private Declare Function ReadSerialNumber Lib UBA4204 dll ByVal ptrSN As Long As Long Private Declare Function ReadNumChannels Lib UBA4204 dll ByVal ptrNChannels As Long As Long Private Declare Function ReadFirmwareVersion Lib UBA4204 dll ByVal ptrMajor As Long ByVal ptrMinor As Long As Long Private Declare Function OpenAmp Lib UBA4204 dll As Long Private Declare Function CloseAmp Lib UBA4204 dll As Long END UBA DLL DECLARES Visual C To use the UBA DLL in Visual Cf you must use the System Linq namespace The declara tions must be in an unsafe block Examples of some function declarations for are shown below using System Ling unsafe DllImport UBA4204DLL dl11 private static extern int SetAmpParams int pParams DllImport UBA4204DLL d11 private static extern int GetChannelData int iChannel float pData DllImport UBA4204DLL d11 private static extern int ReadFirmwareVersion out int riMajor out int
20. lifier unit is powered by an internal Lithium Ion battery Before using the product for the first time charge the battery for at least 8 hours following the directions in Section 4 5 Amplifier Controls LKG TECHNOLOGIES UBA 4200 Series Universal DC Biomedical Amplifier Press to turn the amplifier OFF OFF Press to test the amplifier p TEST The green light will come on when the Test button is pressed if the amplifier is functioning properly b Press to turn the amplifier ON F W power battery status indicator Pa TOSlink Battery Charger Connector Connector 41 Powering On Off Press the On button for at least 1 2 second to turn the Amplifier on The Power Light Battery Status Indicator will illuminate Within approximately one second it may change color to indicate the remaining battery capacity If the amplifier is not in use for more than 30 minutes it will automatically turn off If you wish to power off before this to conserve battery power press the Off button 4 2 Self Test Page 13 of 30 To verify that the system is working properly press the Test button If the associated green light turns on the Amplifier Unit microprocessor is working properly If the green light does not illuminate press the OFF button then turn the unit back on by pressing the ON button This will reset the system In some UBA models an error diagnostic has been added to the self tes
21. ng point number In Visual C this is a float in Visual Basic this is a single Functions The function prototypes below are given in C syntax 6 2 Starting and Ending Function Prototype int OpenAmp void Arguments None Returns Error codes as specified in Section 6 1 Actions Creates an instance of the amplifier within the DLL Notes This function must be called before any other function in the DLL can be used Function Prototype int CloseAmp void Arguments None Page 21 of 30 Returns Actions Notes Error codes as specified in Section 6 1 Removes the instance of the amplifier This function must be called before your program exits to avoid memory leakage 6 3 Setting Amplifier Parameters There is a single function to initialize the parameters for data collection Function Prototype int SetAmpParams int Parameters 12 Arguments Parameters 12 Array containing the amplifier parameters The array parameters are Index Meaning 0 Unused 1 Unused 2 Rate 3 Number of Samples 4 Channel Select 5 Preamp Gain 6 High Pass Frequency x10 7 Low Pass Frequency x10 8 Notch Frequency 9 Unused 10 Unused 11 Unused Returns Error codes as specified in Section 6 1 Parameter Notes Unused Values Rate Number of Samples Set to 0 Valid sample rate values are 30000 15000 7500 3750 2000 1000 500 100 60 50 30 25 15 10 5 Passing other val
22. o hold the data freeing any previ ously allocated memory 3 Initiates collection of data from headend and storage in the al located circular buffer 4 Immediately returns Completion of data collection can be tested with the DoneYet function Data are left in the allocated buffer on completion and must be retrieved by the GetChannelData function for each chan nel int DoneYet void None Returns 0 if data collection is complete Otherwise returns an er ror code as specified in Section 6 1 1 Determines if data collection is occurring 2 Determines if all samples have been collected This function is called to check if the current data acquisition is finished int GetChannelData int Chan float Data Chan Channel of data to be retrieved Valid channel numbers are 1 to 4 Data Pointer to a buffer to hold the sample data points for this channel Error codes as specified in Section 6 1 1 Determines if a valid channel number has been passed 2 Determines if data collection is complete 3 Filters the data if required 4 Copies the filtered data into Data The calling program is responsible for allocation of memory for the Data buffer This function is called to retrieve data after it as been acquired using CollectDataWait or CollectDataNoWait Channel number is invalid if it was not specified for data collection by the SetChannels command Page 24 of 30 6 5 Continuous Data Collection 6 5 1 Memory Alloca
23. ow to do this can be found on the Math Works web site at http www mathworks com company newsletters news_notes win03 patterns html To call DLL functions from MATLAB 6 5 you need to download and install the MATLAB DLL Interface Library The library is available from The MathWorks Web site at http www mathworks com support solutions files s33513 GenericDll_1p1 exe The MathWorks DLL Interface Library contains seven functions e loadlibrary Load DLL into memory so that MATLAB can call it e unloadlibrary Unload a DLL and free the associated memory Call a function in loaded DLL e libfunctions List the functions available in a DLL libpointer Create a reference to MATLAB data passed to a DLL function e libstruct Construct an externally defined structure in MATLAB libisloaded Test to see if a given DLL has been loaded into MATLAB For complete details on the library interface see the file shared library doc pdf in the MathWorks downloadable DLL Interface Library package Programs that use the DLL Interface Library call external functions using a four step pattern Load the DLL Interface Library with loadlibrary Prepare data for calls to functions in the library with libpointer and libstruct Call library functions via calllib Unload the DLL library by calling unloadlibrary mper Please refer to the MathWorks documentation for more details 8 2 LabVIEW The National Instruments publi
24. r differential inputs and is powered by a re chargeable Lithium Ion battery The Interface Unit connects to a USB 1 1 port to receive power and to send digital data to a computer or PDA Inputs to the system run through a preamplifier buffer with programmable gains of 1 2 4 8 16 32 or 64 After buffering the data are immediately digitized by a 24 bit sigma delta Analog to Digital Converter The data are then sent in digital form over the fiber optic TOS link connector to the Interface Unit and from there to the USB port of the computer No analog data is transmitted Commands are transmitted from the computer via the USB bus to the Interface Unit which sends them up the second fiber of the TOSlink cable to the Amplifier where they are inter preted and executed by the on board microcomputer An internal rechargeable Lithium Ion battery provides power for the Amplifier Unit Power for the Interface Unit is provided by the USB connection A block diagram of the system is shown below High Resolution Computer Analog to Digital Converter Interface Unit Pure Digitized Signal Electrode Short Cable Over Fiber Optic The UBA 4204 as furnished is designed to be incorporated into your custom biomedical data acquisition and analysis system It is furnished with the software components necessary to allow you to control it and collect data from your Windows XP program in Visual C Visual C Visual Basic MatLab La
25. riMinor 7 3 Using the UBA4204 DLL to collect a fixed number of samples This section contains schemas showing the order in which the various UBA functions should be called It does not show working code but is intended to give the pro grammer a sense of what functions to call e Waiting until data collection is done OpenAmp SetAmpParams CollectDataWait For each channel Page 28 of 30 GetChannelData CloseAmp e Performing other tasks during data collection OpenAmp SetAmpParams CollectDataNoWait While DoneYet 0 Perform Other Tasks For each channel GetChannelData CloseAmp 7 4 Using the UBA4204 DLL for continuous data collection Continuous data collection deposits data in a circular buffer from which it must be re trieved If the data are not retrieved faster than they are deposited eventually the cir cular buffer will fill and an error will occur The size of the buffer allocated in Allo cateBuffer will determine how important rapid data retrieval is OpenAmp AllocateBuffer Test to make sure AllocateBuffer succeeded SetAmpParams StartContinuousData While still want to collect data GetNextData StopContinuousData FreeBuffer CloseAmp Page 29 of 30 8 Utilizing the UBA4204 DLL with MATLAB and LabVIEW 8 1 MatLAB The ability to call generic functions is available only in MATLAB 6 5 on Windows XP 2000 NT 98 A detailed description of h
26. t indicator If the associated green light turns on and remains on without pressing the Test button there may be an issue with your amplifier Please contact LKC Technologies Cus tomer Support if you have any concerns Note The Self Test button does not work if the unit is turned off The Power Bat tery Status indicator must be illuminated for the Self Test to work 4 3 UBA 4200c Interface unit When the interface is plugged into the PC the green light will turn on If the green light is off check the connection to the PC In some UBA models when the interface is transferring data during data acquisition the light will flicker If flickering stops during data collection make sure the amplifier unit is turned on and connected to the interface unit Please contact LKC Technologies Customer Support if you have any concerns 4 4 Input Connections The inputs to the UBA 4204 are 1 5 mm male DIN safety connectors which accommodate connections to most electrodes There are 4 differential inputs and a ground common con nection 4 321 COgeee FOS Model UBA 4204 PATENT PENDING Serial Number LKC Technologies Inc 2 Professional Drive Suite 222 Gaithersburg MD 20879 USA Phone 301 840 1992 Fax 301 330 2237 Info QLKC com www LKC com UBA 4204 Back Label Page 14 of 30 Differential Input Configuration The differential inputs are labeled 1 1 2 2 3 3
27. tion and Management The calling program is responsible for assuring that memory has been allocated within the DLL interface to account for the samples that will be stored during continuous data collection The functions listed below provide this management ability Function Prototype Arguments Returns Actions Notes Function Prototype Arguments Returns Actions Notes int AllocateBuffer int NSam NSam maximum number of samples to be buffered Error codes as specified in Section 6 1 1 Compute amount of memory to allocate 2 If any existing memory is allocated from a previous call to this function without a call to free it free the previously allocated memory 2 Attempt to allocate memory 3 Report success or failure This function must be called before continuous data collection Because the memory is organized as a circular buffer it need not be large if data will be removed by the GetNextData function at a rate comparable to the data delivered by the NewHorizon ampli fier int FreeBuffer void None Error codes as specified in Section 6 1 1 Determine if a buffer was allocated by AllocateBuffer 2 Free the allocated memory Allocated memory should be freed when no longer useful to pre vent memory leakage AllocateBuffer will only allocate a single buffer 6 5 2 Data Collection Before collecting data using these functions you must call OpenAmp SetAmpParams and AllocateBuffer
28. ues will result in Error Code 2 Invalid Parameter Specified Valid sample numbers are 64 128 256 512 1024 2048 4096 8192 16384 32768 or 65536 Passing other values will result in Error Code 2 Invalid Parameter Specified This parameter is ignored for continuous data collection Page 22 of 30 Channel Select Preamp Gain High Pass Frequency x10 Low Pass Frequency x10 Notch Frequency Notes Determines which channels will be sampled Valid values are Desired Binary Hex Decimal Channels Value Value Value 1 0001 0x0001 1 1 2 0011 0x0003 3 1 2 3 0111 0x0007 7 1 2 3 4 1111 0x000F 15 Valid values of preamplifier gain are 1 2 4 8 16 32 64 Passing other values will result in Error Code 2 Invalid Pa rameter Specified Corner 3dB frequency for the high pass filter in 0 1 Hz units Setting this variable to 1 disables software high pass filtering Corner 3dB frequency for the low pass filter in 0 1 Hz units Setting this variable to 1 disables software low pass filtering Notch filter frequency in Hz Setting this variable to 1 dis ables notch filtering Valid notch filter values are 1 50 60 Passing other values will result in Error Code 2 Invalid Pa rameter Specified Notes 1 This function takes 300 500 msec to set parameters and recalibrate the ampli fier 2 The DLL will not verify that sampling rate x channels
29. und New Hardware Wizard will start Found New Hardware Wizard Welcome to the Found New Day Hardware Wizard NS This wizard helps you install software for LKC UBA 4200 Device If your hardware came with an installation CD or floppy disk insert it now What do you want the wizard to do ei Install from a list or specific location Advanced Click Next to continue e Insert the CD that came with your system select Install the software automati cally and click Next gt e If you receive a prompt stating that the driver has not passed Windows Logo Test ing click Continue Anyway Hardware Installation A The software you are installing for this hardware LKC UBA 4200 Device has not passed Windows Logo 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 t Continue Anyway STOP Installation Page 12 of 30 e The drivers for your UBA 4204 will automatically install At the end of the in stallation you should receive a prompt stating the hardware installed properly 4 Using the UBA 4204 The UBA 4204 amp
30. with the proper operation of this product This product conforms to IEC601 1 1988 with Amendments A1 1991 and A2 1995 and to EN60601 1 1990 This product has been tested in accordance with AAMI Safe Current Limits Standard and meets all requirements for direct patient connection The product is an USB powered de vice designed to meet the applicable requirements of UL 60601 1 Standard for Safety Medical and Dental Equipment This device should only be used according to the manufacturer s instructions and by qualified health professionals This product has been approved for both CE and CB certificates 1 6 European Representative Emergo Europe Symbol Molenstraat 15 2513 BH The Hague EC The Netherlands EMERGO EUROPE Tel 31 0 70 345 8570 Fax 31 0 70 346 7299 1 7 Product Introduction The LKC UBA 4204 is a Biomedical Amplifier It is designed to measure low level bioelec trical signals and transmit their digital representation to a computer through a Universal Se rial Bus USB port to a computer running the Windows XP operating system The UBA 4204 was designed and tested for use with the Windows XP operat ing system While it may work properly with Windows Vista it has not been trested in this environment Drivers are not presently available for the Mac OS or Linux Page 7 of 30 The UBA 4204 consists of an Amplifier Unit and an Interface Unit connected by a fiber op tic TOSlink cable The amplifier unit has fou
31. y concealed or apparent damage to the last carrier Report any damage also to us and issue an order for replacement or repair DEFECTS OCCURRING WITHIN WARRANTY PERIOD Parts of units may de velop defects that no amount of initial testing will reveal The price of our instruments makes provision for such service but it does not l Provide for transportation charges to our factory for service Provide for services not performed or authorized by us 3 Provide for the cost of repairing instruments that have obviously been abused or subjected to unusual environments for which they have not been designed We will be happy at any time to discuss by phone letter FAX or e mail sus pected defects or aspects of instrument operation that may be unclear We advise you to inform us by phone letter FAX or e mail of the nature of the defect before returning an instrument for repair Many times a simple suggestion will solve the problem without returning an instrument to the factory If we are unable to suggest something that solves the problem we will advise you as to what parts of the equipment should be returned to the factory for service DEFECTS OCCURRING AFTER WARRANTY PERIOD Charges for repairs after the warranty period will be based upon actual hours spent on the repair at the then pre vailing rate plus cost of parts required and transportation charges or you may elect to purchase an extended warranty We will be happy to discuss by
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