InstruTECH - Digitimer
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1. INSTRUTECH CORPORATION ITC 18 USER S MANUAL 1 5 Technical Specifications Unless otherwise noted ambient temperature 25 degrees Celsius Analog Input Channels Channels Input Range Gain Settling time Input Type Conversion Speed Resolution Input impedance Input connector Channels Output Range Output Type Conversion Speed Resolution Settling Time Current drive capability Output impedance Output connector Digital VO Channels TTL Inputs TTL Outputs Driven Outputs Trigger In Trigger Out 8 10 24 volts to 10 23 volts High speed programmable gain 1 2 5 or 10X instrumentation amplifier 3 microseconds 0 01 all gains True Differential Programmable 5 us 200 kHz to 82 ms 12 Hz in 1 25 us steps 16 bit 1 in 3200 1 Meg ohm BNC Analog Output Channels 4 with built in thermal stabilization 10 24 volts to 10 23 volts Pseudo differential Programmable from 5 us 200 kHz to 82 ms 12 Hz in 1 25 us steps True 16 bit Less than 4 us to 0 001 20 milliamperes typical 200 ohm BNC Sixteen CMOS compatible input lines with programmable sense level HIGH or LOW Two modes of operation latched or level sensing The latched mode will hold the value until read by the software Level sensing will change with all level transitions Either mode requires an input signal with a minimum duration of 12. ADC inputs Eight BNC connectors provide access to the eight individual 16 bit analog to digital converter input channels Each A D channel uses a high speed programmable gain instrumentation amplifier to provide individually selectable gain Analog to digital converter channel selection and sampling interval timing is controlled by the acquisition software The ADC channels have an input range of 10 24 to 10 23 volts These channels are optically isolated from the computer These channels are differential inputs If the BNC connector shield is left unconnected unexpected results can occur Use only high quality 75 ohm BNC cables for optimal results SIGNAL GROUND connector A 3 mm banana receptacle provides connection to the internal analog ground This low noise ground is provided for connecting to the recording amplifier This ground connection is not connected to the ITC 18 case or to the computer power supply ground If desired the user should provide an external connection between the case and the instrument rack The mating plug for this connector is a Keystone Electronics Corporation part number 6077 TTL digital inputs Four BNC connectors provide access to four out of the sixteen digital input channels The digital input channels are controlled by the acquisition software These digital input channels accept standard TTL levels 5 volts and 0 volts These channels are optically isolated from the computer These channels
3. merchantability and fitness for a particular purpose 1 2 Accessories The following items should have been packed with your ITC 18 Computer Interface 1 Power cord 110 volt or 220 volt type depending on application 1 ITC 18 User s manual 1 Warranty card If any of these items are missing please contact Instrutech Corporation immediately 1 3 Unpacking After unpacking the ITC 18 and accessories from the shipping carton please inspect each piece for any signs of shipping damage Please contact the delivering carrier and Instrutech Corporation immediately if there is any damage Do not dispose of the shipping carton The carrier will want to examine the shipping carton to process a damage claim Instrutech Corporation insures all shipments to cover shipping damage It is also advisable to keep the shipping carton in the event that the instrument must be returned for service INSTRUTECH CORPORATION ITC 18 USER S MANUAL 1 4 Purchase Information Take the time now while getting started to record some purchase information here This will make it easier to locate this information should this become necessary in the future Dealers teta e bea sere lada e Ecol Dealer telephone number ssvornnvnnnnrnvnrnnrnne Dealer email address ooooccccnconcnnnnnnncnnnnnnos Contact name at dealer oocc onncccnnnnnnncnnn Serial number coooccccncnnccnccnnccnnnnnncnnnncnncccnnnns Other notes
4. IBM compatible FIFO memory Standard 256 kilosample FIFO Optional 1024 kilosample FIFO External Clock Optional 12 8 megahertz external clock will synchronize multiple ITC 18 interfaces Dimensions W 19 H 1 75 D 10 5 Weight 8 pounds W 47 5 cm H 4 375 cm D 26 25 cm Weight 3 6 kg Power requirements 85 264 VAC 47 440 Hz 15 Watts Warranty Two years parts and labor All technical specifications are nominal conditions and are subject to change without notice 1 6 Description The ITC 18 is the second generation computer interface from Instrutech Corporation The ITC 18 offers increased capability while retaining all of the exceptional features of it s predecessor the ITC 16 The ITC 18 advances data acquisition to a new level Hardware Configuration The ITC 18 is a rack mountable unit It has BNC connectors for the analog inputs and outputs and ribbon cable connectors for the digital lines The ITC 18 is connected to a host computer over a shielded cable to a host interface card Host interfaces boards are available for ISA bus PCI bus and NUBUS Moving the ITC 18 from one platform to another is a simple matter of replacing the host interface board INSTRUTECH CORPORATION ITC 18 USER S MANUAL This configuration is unique to data acquisition units Most data acquisition devices are printed circuit boards installed directly in the computer itself The interior of a computer is an elect
5. Rear Panel Connector PIN Asstsnmemts 9 40 c sacescvsaddsoedactevsssntev sued snodaheduaasqeebactusnstnaceaCdaaniee 22 7 1 VR 10 100 Digital Data Recorder Connector ssaranvnnnnvnvnranvnnnenvnnnnrnvnrasvvrnsnvnrsnenen 22 12 SEA LOC me vesen 23 7 3 Current Driver Out Connector si tds 23 7 4 Digital I O and Sequence Out Connector rrrarrnnnnrnrannnnrrnnerrrnennrressnrrnsrnrrsennrnsennrsse 24 AA ets ipl Seid ays Ss ene wave sac naive a ae ave 25 O ET Va beaiaes a gb batted alan E E a 25 8 2 Obtaining Warranty SERVICE poa neta A A 25 9 Other INSTRUTECH CORPORATION Products rervrerrrnnnvnnvrevrrenrerrnrnnnrnesnersnrrerssvrneneesnesnee 26 INSTRUTECH CORPORATION ITC 18 USER S MANUAL FIGU FIGU FIGU FIGU FIGU FIGU FIGU RE 1 RE 2 RE 3 RE 4 RE 5 RE 6 RE 7 Table of Figures ITC 18 FRONT PANEL CONTROLS 000 ccccccccccessssceccessececssececeesseeecesssececssscesesaeeecnssseeeenseeeesaas 12 ITC 18 REAR PANEL CONTROLS 0 cccccccccsscccecsseccecessececssecececssececsensececcsseeceessececssnaeecenseseceeses 14 ITC 18 CURRENT DRIVER OUT EXTERNAL CONNECTIONS 00 ccccccsccecesscececenscecessseeeensseeeeenes 15 ITC 18 VR 10 VR 100 CONNECTOR PINS 0 cccccccccssscecssscceeessececeessececesececeenececcssseeeensseeeeenes 22 ITC 18 SERIAL PORT CONNECTOR PINS 0 0 cccccssscecesssececesececeesseeeceessececssseeceessececssnseeeenseeeessaas 23 ITC 18 CURRENT DRIVER OUT CONNECTOR PINS 0
6. into a measurement system The optical isolation of the ITC 18 brings with it another benefit that simplifies complex measurement systems Since the analog inputs and outputs of the ITC 18 float with respect to ground the ITC 18 and computer are not a source of ground loop problems Analog Circuitry The ITC 18 provides eight 18 bit A D converters that feature individually programmable input range of 1 2 5 or 10 volts Using separate A D converters for each analog input channel eliminates crosstalk between channels and improves the frequency response of the analog inputs Typical data acquisition devices use a single A D converter with a multiplexer to select between input channels The multiplexer usually an integrated circuit is a single point where all analog input signals connect Crosstalk both from the multiplexer itself and from closely spaced printed circuit board traces causes signals appearing at one analog input to appear at other inputs as well The amount of crosstalk is usually frequency dependent High frequency signals can be affected significantly 10 INSTRUTECH CORPORATION ITC 18 USER S MANUAL The ITC 18 design is particularly important when making measurements using multiple high frequency signal sources and analyzing the signals for correlation An added benefit to the ITC 18 design all analog inputs are sampled simultaneously This simplifies analysis of high frequency correlation between signals sin
7. 100 series digital data recorders Optional serial cable and software is required to utilize this capability 16 INSTRUTECH CORPORATION ITC 18 USER S MANUAL 3 Installation 3 1 Hardware installation 1 Install the host interface card as described in the host interface manual 2 Install the ITC 18 interface into the operating position Make sure that the interface can reach the computer with the supplied cable Do not extend this cable Unreliable operation can result if this cable is extended 3 Install the cable between the ITC 18 interface and the host interface card The connectors on either end of the cable are keyed and will only mate when properly inserted For proper electrical connection secure the cable to both the host interface and the ITC 18 with the attached screws Do not use any other cable other than the Instrutech supplied cable Improper operation may result 1f this cable is replaced by a different type cable Make sure that the power is off on both the computer and the ITC 18 interface when connection is being made 4 Connect the power cord to the ITC 18 The internal power supply used in the TC 18 is an auto switching multi voltage supply that will operate from 100 volts to 260 volts Make sure that the ITC 18 power cord is plugged into a properly grounded AC receptacle Improper grounding of the ITC 18 could result in an electrical shock hazard It is advisable to plug all equipment into a common outlet strip thi
8. 50 nanoseconds Four inputs are available through BNC connectors on the front panel All inputs are available through a rear panel multi pin connector Two banks channels with sixteen CMOS compatible output lines each Will drive AC HC ACT HCT or a maximum of eight TTL loads Four outputs from channel 1 are available through BNC connectors on the front panel All outputs are available through a rear panel multi pin connector and internal connectors Fourteen current outputs parallel with channel output lines divided into two user banks Each bank of 7 outputs can sink 350 milliamperes maximum depending on number of outputs in use An external power source is required Available on a female DB 25 connector on rear panel Start acquisition from an external unisolated CMOS compatible source Available through a BNC connector on the front panel Unisolated programmable trigger output Available through a BNC connector on the front panel INSTRUTECH CORPORATION ITC 18 USER S MANUAL Sequencer Out Seven isolated programmable CMOS compatible trigger outputs The sequencer outputs are very precise triggers that can be programmed to toggle when a particular entry in the sequence RAM is executed Available through a multi pin connector on rear panel Host interfaces available MAC 18 Interface to MAC II and PowerMAC NUBUS computers AT 18 Interface to ISA bus AT class computers PCI 18 Interface to PCI bus computers Macintosh or
9. A A Pin 40 Pin 2 Figure 4 ITC 18 VR 10 VR 100 connector pins PPMD13 data bit 13 PPMERR ERROR bit PPMSTR valid data flag PPMTRG TRIGGER bit 40 Do not ground these connections they are used by the VR 10 100 22 INSTRUTECH CORPORATION ITC 18 USER S MANUAL 7 2 Serial I O Connector Below is a listing of the pin assignments of the male serial port connector on the rear panel of the TC 8 interface eevee Figure 5 ITC 18 Serial Port connector pins Assignment RLSD received line signal detect 7 CTS cleartosend CTS clear to send RI ring indicator 7 3 Current Driver Out Connector Below is a listing of the pin assignments of the Current Driver Out connector on the rear panel of the ITC 18 interface Figure 6 ITC 18 Current Driver Out connector pins Pin Assigmment Pn Assigmment 9 ground 22 outehannel5 bak 10 11 12 13 outehammelO bank 23 INSTRUTECH CORPORATION ITC 18 USER S MANUAL 7 4 Digital I O and Sequence Out Connector Below is a listing of the pin assignments of the Digital I O and Sequence Out port on the rear panel of the ITC 18 interface Pin 49 Pin 1 y 7X Pin 50 Pin 2 Figure 7 ITC 18 Digital I O and Sequencer Out connector pins in Top Connector _ _Bottom Connector Pin Top Boom Connector topo ground nocommection ground 3 TrLimputbit8 TrLinputbito er E 5 TrLimputbit9 TrLinpu
10. Instrutech files by email If you do not have access to the Internet call Instrutech and request the ITC 18 driver disk of your choice 6 2 Igor XOP s Instrutech Corporation has available an XOP for Wavemetrics Igor that will allow researchers and developers to write custom applications using the ITC 18 Interface and Wavemetrics Igor software This XOP and the appropriate manual is available from Instrutech Corporation by request It is also available from Instrutech Corporation by Internet WWW FTP or email For access to our WWW site our URL is http www instrutech com For access by anonymous FTP use the URL ftp ftp instrutech com By email send an empty message to info instrutech com for a document that will describe how to access Instrutech files by email If you do not have access to the Internet call Instrutech and request the ITC 18 XOP diskette 20 INSTRUTECH CORPORATION ITC 18 USER S MANUAL 7 Product Registration 7 1 Why Register your purchase Instrutech Corporation periodically offers enhancements and updates to our products Without product registration users of our products may miss out on announcements of important enhancements to the products that they are using Instrutech Corporation does not make our customer list available to anyone else Any information that you provide to us is strictly confidential 7 2 How to Register your purchase Product registration can be accomplished in two ways You may fil
11. Single width rack mount panel that breaks out the VR 10B auxiliary analog and digital channels into convenient BNC connectors and banana jacks 4 D A 8 A D plus 16 digital I O channels Available with interfaces for the ISA PCI and NuBus computers Digital video processing system for PCI bus 40 Mhz 12 bit A D with multistage processing pipeline and 32 bit DSP Includes acquisition software Computerized patch clamp amplifier Single channel analysis for MacOS and Windows Data acquisition stimulator and analysis software for MacOS and Windows Graphing and data analysis for the Macintosh Windows95 and WindowsNT Continuous acquisition software for the ITC 18 under MacOS and Windows Optional AxoTape based display software for the VR 111 interface board for the IBM PC AT Call Instrutech Corporation at 516 883 1300 for more detailed information new products and prices You may also check our WWW pages at http www instrutech com for our latest product announcements 26
12. USER S MANUAL Model ITC 18 DATA ACQUISITION INTERFACE 20000 00000000 729992 TEA AA MBA A DADA 66008 20 Vanderventer Avenue Suite 101E Port Washington New York 11050 3752 U S A AS FU Tel 516 883 1300 Fax 516 883 1558 Internet sales instrutech com Precision Instrumentation for Biological Research support instrutech com http www instrutech com INSTRUTECH CORPORATION ITC 18 USER S MANUAL Table of Contents T ble of Conti ii lerke basisen 2 Tablet Feels AE 4 A GA GNR GISLE 5 1 General normado iia is 6 1 POEMA use ae 6 D2 NCCES SOME RR 6 1 Upson aner OE 6 LA Pa man RES 7 1 5 Technical Specifications in STG 8 NG D sciipti oN rn e Ea o EE E SEES e NESES 9 2 Controls and Functions sorsas inea ee ie 12 2 1 Front Panel Controls ui aii 12 2 2 Rear Panel COn an ria 14 e de e e e e 17 3 l Hardware instalo tir ti 17 3 Important c nsideratlonsS ii acid 18 Deck WA Dd id 18 3 1 Differential analog to digital inputs 0 0 lee eee ese ceseceeeeeeeeesseecsaecsseesseeesaeeesaeenes 18 4 Troubleshooting s i a 19 Additional Sol Ware ti idas 20 5 1 Available Driver Sol Wariano ia ii 20 5 2 DOE XOP iaa iaa 20 6 Product Resta satis 21 6 1 Why Register your PUES aiii Ia NTE 21 6 2 How to Register your purchase Mustaine 21 INSTRUTECH CORPORATION ITC 18 USER S MANUAL 6 3 Product announcement mailing liSt ooonncccnnncccnnncccnnoccnonancnonancnnnnncnnnnccnnnncnnnnncnnnnss 21 7
13. anties other than those described above or to extend the duration of any warranties beyond the time period described above on the behalf of Instrutech Corporation If Instrutech Corporation agrees to such a modification of this warranty Instrutech will furnish a modified copy of this agreement which must be presented if a claim is being made under these modified terms 9 2 Obtaining Warranty Service Warranty service of this Product can be obtained by returning the Product post paid and insured to Instrutech Corporation or one of its sales agents Prior authorization before shipping the product is advised for the most expedient service 25 INSTRUTECH CORPORATION ITC 18 USER S MANUAL PCI 18 MAC 18 AT 18 VR 100B Digital Data Recorder VR 10B Digital Data Recorder VR 111 Interface for VR10 100 VR 10B I O panel ITC 16 computer interface DVP 32 PCI interface EPC 9 Patch Clamp TAC PULSE PULSEFIT IGOR software ACQUIRE TAPEPLAY 10 Other Products available from Instrutech Corporation Host Interface Card for the ITC 18 and PCI bus computers Host Interface Card for the ITC 18 and NUBUS computers Host Interface Card for the ITC 18 and ISA bus computers Eight channel VCR based digital data recorders Two channel VCR based digital data recorder with built in programmable stimulator IBM PC AT plug in card for direct digital transfer of data to the computer hard disk for video tape or in real time
14. are optimized to drive 75 ohm BNC cables into an AC HC ACT HCT or 8 TTL load TTL digital outputs Four BNC connectors provide access to four out of the sixteen digital output channels The status of the digital output channels are controlled by the acquisition software These digital channels output standard TTL levels 5 volts and 0 volts These channels are optically isolated from the computer These channels are optically isolated from the computer These channels are optimized to drive 75 ohm BNC cables into an AC HC ACT HCT or 8 TTL load O TRIG IN A BNC connector provides access to the external trigger input A TTL trigger pulse can be given to start data acquisition The 7C 18 will be triggered with a positive logic pulse with a minimum duration of 150ns This input is not isolated 13 INSTRUTECH CORPORATION ITC 18 USER S MANUAL O TRIG OUT A BNC connector provides access to the sequencer out data bit 0 This sequence bit will switch with each timer period and does not use a time slot Can be used as a gate output signal for triggering a scope or other instrument when data acquisition has started The true functionality of this output is software dependent This output is not isolated 2 2 Rear Panel Controls DIGITAL I O and SEQUENCER OUTPUTS SERIAL I O 20 mm type F 2 TN 3AG type F 1 8 0 Fuse CURRENT DRIVER OUT PX EXTCLK HOSTCOMPUTER VR 10 VR 100 AN IN Bb bd Figure 2 ITC 18 Rear Panel Co
15. cccccsccccesssececesscececssececeessececsssseceesteeeeeaas 23 ITC 18 DIGITAL I O AND SEQUENCER OUT CONNECTOR PINS rrrerervrnrrrnrnrnrennrrerrennnnverernrnvennnne 24 INSTRUTECH CORPORATION ITC 18 USER S MANUAL Credits Instrutech Corporation would like to thank the following individuals who have contributed their time and ideas to the development and testing of the ITC 18 computer interface Dr Fred Sigworth Yale University Dan Brown Bruxton Corporation Dr Hubert Affolter Heka electronik INSTRUTECH CORPORATION ITC 18 USER S MANUAL 1 General Information 1 1 Product intended usage The Instrutech ITC 18 is intended for research use only in a laboratory by persons trained in its use Users are expected to be able to properly operate the ITC 18 and associated instruments The Instrutech ITC 18 is not intended for medical use The Instrutech ITC 18 is not intended for use in life support situations or in situations were improper operation or failure of the ITC 18 can result in personal injury Instrutech Corporation makes no representation that the design implementation testing or manufacture of the ITC 18 meet reasonable standards for use as a medical product As stated in the Instrutech Limited Warranty Statement supplied with each product Instrutech Corporation expressly disclaims all warranties to buyer except the limited warranty set forth above including without limitation to any and all implied warranties of
16. ce there is no time offset between sample points on the input channels The ITC 18 provides four 18 bit D A converters that feature high accuracy with less than 1 bit 300 microvolts of noise The ITC 18 provides sixteen digital input channels that feature level sensitive normal or inverted polarity or latched modes for maximum versatility Thirty two digital output channels fourteen capable of current sink for controlling perfusion valves and other devices Six programmable sequencer outputs for precise triggering from any entry in the sequence RAM All analog and digital input and output channels are sampled simultaneously for maximum precision The ITC 18 can access the A D D A and digital I O channels in any sequence This provides the ability of different sampling rates for each channel FIFO Memory The ITC 18 is supplied with a large 256 or optional 1024 kilosample dynamically allocatable FIFO memory for input and output data The ITC 18 allows data acquisition to be performed independent of the activity of the host computer A large FIFO memory allows for increased acquisition speed while minimizing the use Of computer resources The ITC 18 costs more than low cost data acquisition devices which are built as printed circuit boards mounted in a computer without electrical isolation and multiplexing a single A D converter For this extra cost 1t provides a major improvement in the quality of acquired data making measurements po
17. el 1 and 7 sequencer outputs with individual grounds O EXT CLK optional BNC connector The external clock option allows multiple ITC 18 interfaces to be synchronized by an external master clock Please contact Instrutech or your dealer for availability and specifications HOST COMPUTER 80 pin high density connector Connection to host interface board For Macintosh use either a MAC 18 NUBUS bus host or PCI 18 PCI bus host interface For Intel based computers use either a AT 16 ISA bus host or PCI 18 PCI bus host interface Note the inter connecting cable is supplied with the host interface card O VR 10 VR 100 optional 40 pin female box header connector The ITC 18 can interface digitally with one of our VR 10 100 series data recorders This connector provides the link between the two units Optional cable and software is required to utilize this capability The mating connector for this port is a 3M part number 3318 0000 ore quivalent Maximum power supply voltage 50 Volts Note The current sink grounds are fuse protected in case current is fed back to the ITC 18 interface A low impedance connection should be made if a common ground external power Ground supply is used As shown maximum drive current is 350 mA 15 INSTRUTECH CORPORATION ITC 18 USER S MANUAL O SERIAL I O optional The Serial connector is used to connect to the host computers serial port when acquiring data using one of our VR 10
18. l out and mail in the product registration warranty card supplied with each Instrutech Corporation product You may also register on line at our World Wide Web site at http www instrutech com 7 3 Product announcement mailing list Instrutech Corporation has an Internet emailing list which we use as our primary outlet for announcements of new products product enhancements and product updates We strongly recommend that all users of our products sign up for this emailing list Email is kept to a minimum and list membership is kept in the strictest confidence Only Instrutech Corporation can send mail to members of our emailing list You may join this mailing list through our World Wide Web site at http www instrutech com To do this select Instrutech email lists from the main menu You may also sign up for this list by sending email to listserv instrutech com In the body of this message place the line JOIN instrutech list your email address your name If this subscribe message is sent from the account where you wish to receive your email the your email address and your name parameters are optional This information will be extracted directly from the message 21 INSTRUTECH CORPORATION ITC 18 USER S MANUAL 8 Rear Panel Connector PIN Assignments 7 1 VR 10 100 Digital Data Recorder Connector Below is a listing of the pin assignments of the optional VR 10 VR 100 port on the rear panel of the ITC 18 interface Pin 39 Pin 1 Vv Y
19. ntrols O FUSE Replace fuse with a standard 20 mm type F 2A fuse only Littelfuse 217002 POWER CONNECTOR Accepts standard three wire IEC female type power cords The appropriate power cord will be provided with the ITC 18 The ITC 18 will function with a line voltage of 100 volts AC to 120 volts AC or 200 volts AC to 240 volts AC Acceptable line frequencies are from 47 hertz to 440 hertz The maximum power used by the TC 18 is fifteen watts WARNING To avoid a shock hazard the ITC 18 must be plugged into a properly grounded receptacle CURRENT DRIVER OUT DB 25 female connector The ITC 18 provides 14 digital output channels that can be used either as standard TTL levels or as current sink To use as current sink channels the connections to the external device is as follow 14 INSTRUTECH CORPORATION ITC 18 USER S MANUAL AE ZA FUSE N00 240 VOLTS DIGITAL I O and SEQUENCER OUTPUTS EXT CLK CURRENT DRIVER OUT s HOST COMPUTER SERIAL I O VR 10 VR 100 ClampA Digital Output Figure 3 ITC 18 Current Driver Out external connections O FUSE Current driver out ground fuse This fuse will open when current is fed back into the ITC 18 Replace fuse with a standard 1 5 inch type F 1 8A fuse only DIGITAL VO amp SEQUENCE OUTPUTS Dual 50 pin IDC connector 16 Digital input lines with individual grounds 16 Digital output lines with individual grounds Chann
20. ont panel to the signal ground connector on the signal source Most patch clamp amplifiers provide a suitable connection point for the signal ground 18 INSTRUTECH CORPORATION ITC 18 USER S MANUAL 5 Troubleshootin Most problems arise from incorrect installation of the hardware and or incorrect use of the software Check for proper installation of the hardware interface card Check the cable connecting the computer to the ITC 18 interface Make sure both ends are plugged in securely and that the cable is not damaged Check to see that the AC line cord is plugged in correctly Check the fuses on the ITC 18 interface rear panel If all of the above steps fail to resolve the problem then contact your dealer for assistance 19 INSTRUTECH CORPORATION ITC 18 USER S MANUAL 6 Additional Software 6 1 Available Driver Software Instrutech Corporation has available driver software for researchers and developers who wish to write custom applications using the ITC 18 Interface These drivers and appropriate manuals are available in both MacOS and Windows formats They are available from Instrutech Corporation by request They are also available from Instrutech Corporation by Internet WWW FTP or email For access to our WWW site our URL is http www instrutech com For access by anonymous FTP use the URL ftp ftp instrutech com By email send an empty message to info instrutech com for a document that will describe how to access
21. ration will return the Product postpaid and insured in the most appropriate method as determined by Instrutech Corporation If a faster shipping service is desired by the customer any additional special delivery expenses must be paid by the customer This warranty does not apply to shipping damage Instrutech Corporation fully insures all shipments Any claims of damage upon receipt must be filed with the carrier and Instrutech Corporation immediately This warranty does not apply to any exterior appearance item of the Product which has been damaged or defaced which has been subjected to misuse and abuse abnormal service or handling or which has been altered or modified in design or construction This warranty does not apply to any interconnection cables supplied with the Product This warranty does not apply if any unauthorized repairs modifications or alterations have been made to the Product This warranty applies to software products only to the extent of maintenance release software to correct improper operation of the Product Software updates to increase the capabilities of the present product are not to be provided under the terms of this warranty Updates will be sent at no cost to the customer by normal common carrier routes If faster delivery is desired the customer must assume any additional expenses for special delivery service No sales organizations other than Instrutech Corporation itself are authorized to make any warr
22. rically noisy environment At the very high speeds of modern computers even a short length of a conductive trace on a PC board acts as an antenna Certain kinds of data acquisition devices are not affected by such noise e g slow speed integrating A D converters but high speed high resolution A D and D A converters like the ones used in the ITC 18 are affected by such noise Mounting the electronics in an external box is the most effective way of reducing this noise Optical Isolation The analog electronics of the ITC 18 are optically isolated from the digital electronics and the computer This provides complete electrical isolation between the computer and the measurement The optical isolation is provided to eliminate computer electrical noise from the analog measurements Computers contain digital electronics that switch at high speed producing large electrical transients The computer ground functions as the return path for these transients resulting in substantial high frequency ground noise The ITC 18 has a completely separate analog ground that is isolated from the computer ground Computer ground noise is not coupled into the measurement Optical isolation is almost essential if low noise analog outputs are provided If the analog outputs are not electrically isolated from the computer ground the analog output ground will contain computer generated noise This is one of the major ways by which computer generated noise is introduced
23. s will minimize power line induced noise in the system Equipment plugged into different outlets can cause excessive sixty hertz noise to be induced into the acquired data 5 Before powering up please recheck all connections If all connections are proper then the power led will illuminate once the computer is started 6 You are now ready to install the software Follow the installation instructions provided with the software that you will be using with the ITC 18 interface 17 INSTRUTECH CORPORATION ITC 18 USER S MANUAL 4 Important considerations 4 1 Warm up The ITC 18 digital to analog converter circuitry uses a sophisticated thermal stabilization technique to provide complete stability of the DAC outputs over time For optimal stability of the DAC outputs the ITC 18 requires 20 to 30 minutes of warm up time During this initial 20 minutes after the ITC 18 is turned on DAC drift will occur This drift can be as large as 6 mV during the initial warm up period After this warm up period the DAC outputs will be extremely stable 4 2 Differential analog to digital inputs The ITC 18 analog to digital converter inputs are true differential inputs For proper operation of the A D converter the cable connecting the A D input to the signal source must have a complete shield High quality 75 ohm BNC to BNC cables are recommended for optimum performance connection should be made between the SIGNAL GROUND connector on the ITC 18 fr
24. ssible that would not otherwise be feasible 11 INSTRUTECH CORPORATION ITC 18 USER S MANUAL 2 Controls and Functions 2 1 Front Panel Controls Circled numbers reference to the diagram of the front panel t Jen DAC OUTPUT ADC INPUT Deo mor CT Td Tot os BH READY B S e 0 SIGNAL S GROUND 7 w OOO 000 000 o O 2 gant ee Sen 2 D ITC 18 OMPUTER INTERFACE NSTRUTECH c orporakion at Nei at NY us D 1 J aa Figure 1 ITC 18 Front Panel Controls O READY indicator The ready indicator will be illuminated when the ITC 18 has been properly initialized by the host computer and the acquisition software If this indicator is not illuminated then the ITC 18 cannot function properly POWER indicator The power indicator will be illuminated when the ITC 18 has been powered on The TC 18 uses circuitry that will automatically switch the internal power supply when the computer is started or shutdown DAC outputs Four BNC connectors provide access to the four individual deglitched 16 bit digital to analog converter outputs All DAC outputs are thermally stabilized to reduce drift The digital to analog converter output voltages and timings are controlled by the acquisition software The DAC channels have an output range of 10 24 to 10 23 volts These channels are optically isolated from the computer 12 INSTRUTECH CORPORATION ITC 18 USER S MANUAL
25. tbitl seed U 7 TILimputbitiO TrLinputbit2 ground 9 TrLinpubitlt TILimputbi3 14 ground 20 ground 22 ground 5 chanel Oi 14 Tr eanet Oc 24 ground 25 TILchamelObi15_ TTL channel Obit 26 ground 27 TTLehanmellbit8 TTLehammellbitO EE sen U 29 TILchamelibi9 TTLehanmellbitl ground Er gt DR ground 33 TILchamelibill_ TILchamelibi3 3 ground 35 TILchamelibi12_ TPLehammellbit4 36 ground 37 TILchamelibi13 TILchamelibiS 38 ground 39 TILchamelibiti4 TTLehammellbii6 40 gromd 42 ground gt 43 sequence out4 od sequenceoutO 44 ground 45 sequence outS dene out I 46 ground 47 sequenceout ene ou 2 out 2 48 ground 49 nocomection sequenceout3 50 ground 24 INSTRUTECH CORPORATION ITC 18 USER S MANUAL 9 Warranty Information 9 1 Limited Warranty Instrutech Corporation warrants to the first purchaser for a period of two years from the date of purchase that this Instrutech Instrument hereafter referred to as the Product will be free from defective workmanship and materials and agrees that it will at 1ts option either repair the defect or replace the defective Product or part thereof at no charge to the purchaser for parts and labor The Product must be returned to Instrutech Corporation postpaid and insured Instrutech Corpo
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