USB-1208FS User's Guide
Contents
1. Caution The 5 V terminal is an output Do not connect to an external power supply or you may damage the USB 1208FS and possibly the computer The maximum total output current that can be drawn from all USB 1208FS connections power analog and digital outputs is 420 mA This maximum applies to most personal computers and self powered USB hubs Bus powered hubs and notebook computers may limit the maximum available output current to 100 mA Just connecting the USB 1208FS to your computer draws 80 mA of current from the USB 5 V supply Once you start running applications with the USB 1208FS each DIO bit can draw up to 2 5 mA and each analog output can draw 15 mA The maximum amount of 5 V current available for experimental use over and above that required by the USB 1208ES is the difference between the total current requirement of the USB based on the application and the allowed current draw of the PC platform 500 mA for desktop PCs and self powered hubs or 100 mA for bus powered hubs and notebook computers With all outputs at their maximum output current you can calculate the total current requirement of the USB 1208FS USB 5 V as follows USB 1208FS 80 mA 16 DIO 2 5 mA ea 2 AO O 15 mA ea 150 mA For an application running on a PC or powered hub the maximum available excess current is 500 mA 150 mA 350 mA This number is the total maximum available current at the PC 5 V screw terminals Measurement Computing h2. opens as the USB 1208FS is detected by your computer Found New Hardware 1 Found New Hardware c USB Human Interface Device USB Human Interface Device Found New Hardware 1 Found New Hardware aay Interface 0 Interface O It is normal for multiple dialogs to open when you connect the USB 1208FS for the first time The last popup balloon or dialog states Your new hardware is installed and ready to use and the LED on the USB 1208FS should flash and then remain lit This indicates that communication is established between the USB 1208FS and your computer You can install up to two USB 1208FS units on most computers If you need to connect more than two USB 1208FS units to your computer contact Tech Support by phone fax or e mail Phone 508 946 5100 and follow the instructions for reaching Tech Support Fax 508 946 9500 to the attention of Tech Support Email techsupport mccdaq com Caution Do not disconnect any device from the USB bus while the computer is communicating with the USB 1208ES or you may lose data and or your ability to communicate with the USB 1208FS If the LED turns off If the LED is illuminated but then turns off the computer has lost communication with the USB 1208FS To restore communication disconnect the USB cable from the computer and then reconnect it This should restore communication and the LED should turn back on 12 Chapter 3 Functi
3. 5 Set the Universal Library EXTCLOCK option with cbAInScan AInScan for the slave USB 1208FS to enable pacing from the master USB device This InstaCal option does not affect internally paced acquisition It only affects scans that use the EXTCLOCK option An example of a master slave configuration is shown below Set the Universal Library Master i EXTCLOCK option with USB 1208FS i USB 1208FS cbAInScan AInScan for the slave USB 1208FS Configure the Configure the SYNC pin SYNC pin for output for input Figure 15 Configuring for synchronous data acquisition When you are operating one USB 1208FS do not set the EXTCLOCK option unless you are using an external clock for A D pacing 24 Chapter 4 Specifications Typical for 25 C unless otherwise specified Specifications in italic text are guaranteed by design Analog input Table 1 Analog input specifications Parameter Conditions Specification A D converter type Successive approximation type Input voltage range for linear operation CHx to GND 10 volts V max single ended mode Input common mode voltage range for linear CHx to GND 10 V min 20 V max operation differential mode Absolute maximum input voltage CHx to GND 28 V max Input impedance 122KOhm Input current Note 1 Vin 10 V 70 microamperes uA typ Vin 0V 12 uA typ Vin 10 V 94 uA typ Number of channels 8 single ended 4 differential
4. A7 9 AGND 29 GND 10 CH3 IN HI 30 PC 5V 11 CH3 IN LO 31 GND 12 AGND 32 Port BO 13 D A OUT 0 33 Port B1 14 D A OUT 1 34 Port B2 15 AGND 35 Port B3 16 CAL 36 Port B4 17 GND 37 Port B5 18 TRIG_IN 38 Port B6 19 SYNC 39 Port B7 20 CTR 40 GND 8 channel single ended mode Pin Signal Name Pin Signal Name 1 CHO IN 21 Port AO 2 CH1 IN 22 Port A1 3 AGND 23 Port A2 4 CH2 IN 24 Port A3 5 CH3 IN 25 Port A4 6 AGND 26 Port A5 7 CH4 IN 27 Port A6 8 CH5 IN 28 Port A7 9 AGND 29 GND 10 CH6 IN 30 PC 5V 11 CH7 IN 31 GND 12 AGND 32 Port BO 13 D A OUT 0 33 Port B1 14 D A OUT 1 34 Port B2 15 AGND 35 Port B3 16 CAL 36 Port B4 17 GND 37 Port B5 18 TRIG_IN 38 Port B6 19 SYNC 39 Port B7 20 CTR 40 GND 31 CE Declaration of Conformity Manufacturer Measurement Computing Corporation Address 10 Commerce Way Suite 1008 Norton MA 02766 USA Category Electrical equipment for measurement control and laboratory use Measurement Computing Corporation declares under sole responsibility that the product USB 1208FS to which this declaration relates is in conformity with the relevant provisions of the following standards or other documents EU EMC Directive 89 336 EEC Electromagnetic Compatibility EN 61326 1997 Amendment 1 1998 Emissions Group 1 Class A EN 55011 1990 CISPR 11 Radiated and Conducted emissions Immunity EN61326 Annex A JEC 1000 4 2 1995 Electrostatic Discharge immunity Criteria C
5. JEC 1000 4 3 1995 Radiated Electromagnetic Field immunity Criteria A JEC 1000 4 4 1995 Electric Fast Transient Burst immunity Criteria C JEC 1000 4 5 1995 Surge immunity Criteria A TEC 1000 4 6 1996 Radio Frequency Common Mode immunity Criteria A JEC 1000 4 8 1994 Magnetic Field immunity Criteria A JEC 1000 4 11 1994 Voltage Dip and Interrupt immunity Criteria A Declaration of Conformity based on tests conducted by Chomerics Test Services Woburn MA 01801 USA in August 2004 Test records are outlined in Chomerics Test Report EMI3948 04 We hereby declare that the equipment specified conforms to the above Directives and Standards foe Hosp Z i Carl Haapaoja Director of Quality Assurance Measurement Computing Corporation 10 Commerce Way Suite 1008 Norton Massachusetts 02766 508 946 5100 Fax 508 946 9500 E mail info mccdag com www mccdag com
6. self powered or root port hub In this case the maximum current available from the USB 5 V is 100 mA The minimum USB 5 V voltage level can be as low as 4 1 V This refers to the total amount of current that can be sourced from the USB 5 V analog outputs and digital outputs Table 18 General specifications Parameter Conditions Specification Device type USB 2 0 full speed Device compatibility USB 1 1 USB 2 0 Environmental Table 19 Environmental specifications Operating temperature range 0 to 70 C Storage temperature range 40 to 70 C Humidity 0 to 90 non condensing Mechanical Table 20 Mechanical specifications Dimensions 79 millimeters mm long x 82 mm wide x 25 mm high USB cable length 3 meters max User connection length 3 meters max Main connector and pin out Table 21 Main connector specifications Connector type Screw terminal Wire gauge range 16 AWG to 30 AWG 30 USB 1208FS User s Guide Specifications 4 channel differential mode Pin Signal Name Pin Signal Name 1 CHO IN HI 21 Port AO 2 CHO IN LO 22 Port A1 3 AGND 23 Port A2 4 CH1 IN HI 24 Port A3 5 CH1 IN LO 25 Port A4 6 AGND 26 Port A5 7 CH2 IN HI 27 Port A6 8 CH2 IN LO 28 Port
7. the analog inputs are restricted to a 10 V to 20 V signal swing with respect to ground all ranges except 20V can realize a linear output for any differential signal with zero common mode voltage and full scale signal inputs The 20 V range is the exception You cannot put 20 V on CHHI and 0 V on CHLO since this violates the input range criteria 17 USB 1208FS User s Guide Functional Details The table below shows some possible inputs and the expected results Sample inputs and differential results CHHI CHLO Result 20 V OV In Valid 15 V 5 V In Valid 10 V OV 10 V 10 V 10 V 20 V OV 10 V 10 V OV 20 V 20 V 10 V 10 V 20 V 10 V OV 10 V 15 V 5 V 20 V 20 V 0 20 V For more information on analog signal connections For more information on single ended and differential inputs refer to the Guide to Signal Connections this document is available on our web site at www mccdaq com signals signals pdf Analog output terminals D A OUT 0 and D A OUT 1 You can connect up to two analog output connections to the screw terminal pins 13 and 14 D A OUT 0 and D A OUT 1 Refer to the pinout diagrams on page 15 for the location of these pins Each channel can be paced individually at rates up to 10 000 updates per second Both channels can be paced simultaneously using the same time base at 5000 updates per channel The 0 4 096 V output range provides a convenient
8. 1 mV per LSB when setting the output voltage levels Digital I O terminals Port AO to A7 and Port BO to B7 You can connect up to 16 digital I O lines to the screw terminal containing pins 21 to 40 Port AO to Port A7 and Port BO to Port B7 Refer to the pinout diagrams on page 15 for the location of these pins You can configure each digital port for either input or output When you configure the digital bits for input you can use the digital 1 O terminals to detect the state of any TTL level input Refer to the switch shown in Figure 9 and the schematic shown in Figure 10 If the switch is set to the 5 V input Port AO reads TRUE 1 If you move the switch to GND Port AO reads FALSE Figure 9 Digital connection Port AO detecting the state of a switch 18 USB 1208FS User s Guide Functional Details GND 5V Figure 10 Schematic showing switch detection by digital channel Port AO For more information on digital signal connections For more information on digital signal connections and digital I O techniques refer to the Guide to Signal Connections available on our web site at www mccdag com signals signals pdf Power terminals The PC 5V connection pin 30 is on the bottom screw terminal of the USB 1208FS Refer to the pinout diagrams on page 15 for the location of this pin This terminal draws power from the USB connector The 5 V screw terminal is a 5 volt output that is supplied by the host computer
9. 200 0x3FF Read write 512 bytes user area Microcontroller Table 16 Microcontroller specifications Type High performance 8 bit RISC microcontroller Program Memory 16 384 words Data Memory 2 048 bytes Power Table 17 Power specifications Parameter Conditions Specification Supply current Note 9 80 mA 5V USB power available Note 10 Connected to self powered hub Connected to externally powered root port hub 4 5 V min 5 25 V max Connected to bus powered hub 4 1 V min 5 25 V max Output current Note 11 Connected to self powered hub 420 mA max Connected to externally powered root port hub Connected to bus powered hub 20 mA max Note 9 status LED This is the total current requirement for the USB 1208FS which includes up to 10 mA for the 29 USB 1208FS User s Guide Specifications Note 10 Note 11 General Self powered hub refers to a USB hub with an external power supply Self powered hubs allow a connected USB device to draw up to 500 mA Root port hubs reside in the PC s USB host controller The USB port s on your PC are root port hubs All externally powered root port hubs desktop PCs provide up to 500 mA of current for a USB device Battery powered root port hubs provide 100 mA or 500 mA depending upon the manufacturer A laptop PC that is not connected to an external power adapter is an example of a battery powered root port hub Bus powered hubs receive power from a
10. OWO 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 be WD WD dN cG gt e DW dN v CO mmmn PILILLA Oeee rere er Ot Oeerereere Z 8088588588088580 OdadadaooaaOaOaaaaaaaa 4 channel differential mode pin out You can connect up to eight analog input connections to the screw terminal containing pins to 20 CHO IN through CH7 IN Refer to the pinout diagrams above for the location of these pins You can configure the analog input channels as eight single ended channels or four differential channels When configured for differential mode each analog input has 12 bit resolution When configured for single ended mode each analog input has 11 bit resolution due to restrictions imposed by the A D converter Single ended configuration When all of the analog input channels are configured for single ended input mode eight analog channels are available The input signal is referenced to signal ground GND and delivered through two wires The wire carrying the signal to be measured connects to CH IN The second wire connects to AGND The input range for single ended mode is 10 V No other ranges are supported in single ended mode Figure 5 illustrates a typical single ended measurement connection 15 USB 1208FS User s Guide Functional Details Figure 5 Single ended measurement connection Battery voltage should read as expected when the hardware is configured for single ended mode Singl
11. USB 1208FS Low cost USB based Module with 8 Channels 12 bit Input User s Guide Va N PFa MEASUREMENT 4Wi Rap COMPUTING USB 1208FS Analog and Digital I O User s Guide B N Pa LW N Vap MEASUREMENT COMPUTING cument Revision 6 March 2 G 201 0 Measurement eerie S Your new Measurement Computing product comes with a fantastic extra Management committed to your satisfaction Thank you for choosing a Measurement Computing product and congratulations You own the finest and you can now enjoy the protection of the most comprehensive warranties and unmatched phone tech support It s the embodiment of our mission To provide PC based data acquisition hardware and software that will save time and save money Simple installations minimize the time between setting up your system and actually making measurements We offer quick and simple access to outstanding live FREE technical support to help integrate MCC products into a DAQ system Limited Lifetime Warranty Most MCC products are covered by a limited lifetime warranty against defects in materials or workmanship for the life of the product to the original purchaser unless otherwise noted Any products found to be defective in material or workmanship will be repaired replaced with same or similar device or refunded at MCC s discretion For specific information please refer to the terms and conditions of sale Harsh Environment Program Any Measurement Comp
12. ake care while handling to avoid damage from static electricity Before removing the USB 1208FS from its packaging ground yourself using a wrist strap or by simply touching the computer chassis or other grounded object to eliminate any stored static charge If any components are missing or damaged notify Measurement Computing Corporation immediately by phone fax or e mail Phone 508 946 5100 and follow the instructions for reaching Tech Support Fax 508 946 9500 to the attention of Tech Support Email techsupport mccdaq com 11 USB 1208FS User s Guide Installing the USB 1208FS Installing the software Refer to the Quick Start Guide for instructions on installing the software on the Measurement Computing Data Acquisition Software CD This booklet is available in PDF at www mccdag com PDFmanuals DAQ Software Quick Start pdf Installing the hardware Be sure you are using the latest system software Before you install your USB 1208FS run Windows Update to update your operating system with the latest HID and USB drivers To connect the USB 1208FS to your system turn your computer on and connect the USB cable to a USB port on your computer or to an external USB hub that is connected to your computer The USB cable provides power and communication to the USB 1208FS When you connect the USB 1208FS for the first time a series of Found New Hardware popup balloons Windows XP or dialogs other Windows versions
13. ave to CHHI and apply the same sine wave 180 out of phase to CHLO The common mode voltage is 0 V The differential input voltage swings from 4 V 4 V 8 V to 4 V 4 V 8V Both inputs satisfy the 10 V to 20 V input range requirement and the differential voltage is suited for the 10 V input range see Figure 6 16 USB 1208FS User s Guide Functional Details 4V Measured Signal CHHI ov A AV 8V Differential 8V 4V AV Figure 6 Differential voltage example common mode voltage of 0 V If you increase the common mode voltage to 11 V the differential remains at 8 V Although the common mode voltage signal on each input now has a range of 7 V to 15 V both inputs still satisfy the 10 V to 20 V input requirement see Figure 7 15V Measured Signal GHH V A 8V Differential 8V cho V N 7V Figure 7 Differential voltage example common mode voltage of 11 V If you decrease the common mode voltage to 7 V the differential stays at 8 V However the solution now violates the input range condition of 10 V to 20 V The voltage on each analog input now swings from 3 V to 11 V Voltages between 10 V and 3 V are resolved but those below 10 V are clipped see Figure 8 3V T Measured Signal CHHI 7y E 3V 4 v 11V 8V Differential NY 3V CHLO 7V v 11V Figure 8 Differential voltage example common mode voltage of 7 V Since
14. cts are not designed with the components required and are not subject to the testing required to ensure a level of reliability suitable for the treatment and diagnosis of people Table of Contents Preface About this User s Guide css ee sees eee reeeo 7 What you will learn from this user s guide sese esse 7 Conventions an this USEr s puide sS sr oieta ear erene aaa Eae a EE Ra EES EE RORE SES a EAEN iatt 7 Where to find more 1nformation asz Zr an e E E E E a E 7 Chapter 1 Introducing the USB 1208FS sss sse esec es eee ee ereer e renee neee ennenen enne 8 USB 1208FS block dia g ianny cts sc scsi a e aran aa a vasa apt E E Eaa oaa A OE ER Eaa estaas 9 Software LEAtures curn a a as 9 Connecting a USB 1208FS to your computer iS 648 esse sese ee eee eee 10 Chapter 2 Installing the USB 1208FS c00o coi ceden kada ddaa eani iaae kaaba ddae 11 What comes with your USB 1208FS shipment sse esse eee 11 dB CC NE Ne oe SR nk ee Eat OE a ARE Tet 11 Additional documentation A A A SR 11 Unpacking the USB 12L08 FS uc o ba Ate 11 Installino the SO Waite ii il 12 Tstall Ee T 12 Chapter 3 Functional Details cccssecsseeseeees secs seeeeeeneeseeesneeseeseeesaneesae seas eeaeseaeseeeseseasseasanedseeseeessessueseneeeaneas 13 Theory of operation analog input acquisition modes sees sese ee eee 13 Software paced MOde TTT Continuous scan mode External COMPONENTS ras 9e 25 aO SONS diia ii did lesa Seek ce aaa AOE t
15. e ended measurements using differential channels To perform a single ended measurement using differential channels connect the signal to CHn IN HI input and ground the associated CHn IN LO input Differential configuration When all of the analog input channels are configured for differential input mode four analog channels are available In differential mode the input signal is measured with respect to the low input The input signal is delivered through three wires The wire carrying the signal to be measured connects to CHO IN HI CH1 IN HL CH2 IN HI or CH3 IN HL The wire carrying the reference signal connects to CHO IN LO CH 1 IN LO CH2 IN LO or CH3 IN LO The third wire connects to GND A low noise precision programmable gain amplifier PGA is available on differential channels to provide gains of up to 20 and a dynamic range of up to 12 bits Differential mode input voltage ranges are 20 V 10 V ES V 4 V 2 5 V 2 0 V 1 25 V and 1 0 V In differential mode the following two requirements must be met for linear operation Any analog input must remain in the 10V to 20V range with respect to ground at all times The maximum differential voltage on any given analog input pair must remain within the selected voltage range The input common mode voltage signal of the differential channel must be in the 10 V to 20 V range in order to yield a useful result For example you input a 4 V pp sine w
16. ebsite at www mccdaq com Chapter 1 Introducing the USB 1208FS This user s guide contains all of the information you need to connect the USB 1208FS to your computer and to the signals you want to measure The USB 1208FS is a USB 2 0 full speed device supported under popular Microsoft Windows operating systems It is designed for USB 1 1 ports and was tested for full compatibility with both USB 1 1 and USB 2 0 ports The USB 1208FS features eight analog inputs two 12 bit analog outputs 16 digital I O connections and one 32 bit external event counter The USB 1208FS is powered by the 5 volt USB supply from your computer No external power is required The analog inputs are software configurable for either eight 11 bit single ended inputs or four 12 bit differential inputs Sixteen digital I O lines are independently selectable as input or output in two 8 bit ports A 32 bit counter can count TTL pulses The counter increments when the TTL levels transition from low to high rising edge A SYNC synchronization input output line lets you pace the analog input acquisition of one USB module from the clock output of another The USB 1208FS is shown in Figure 1 I O connections are made to the screw terminals located along each side of the USB 1208FS Figure 1 USB 1208FS USB 1208FS User s Guide Introducing the USB 1208FS USB 1208FS block diagram USB 1208FS functions are illustrated in the block diagram
17. esting on your machine Note 3 The AD7870 converter only returns 11 bits 0 2047 codes in single ended mode Table 2 Accuracy differential mode Range Accuracy LSB 20 V 5 1 10 V 6 1 5 V 8 1 4 V 9 1 2 5 V 12 1 2 V 14 1 1 25 V 20 1 1 V 24 1 Table 3 Accuracy single ended mode Range Accuracy LSB 10 V 4 0 Table 4 Accuracy components differential mode All values are Range of Reading Gain Error at full scale FS Offset mV Accuracy at FS mV millivolts mV 20 V 0 2 40 9 766 49 766 10 V 0 2 20 9 766 29 766 5 V 0 2 10 9 766 19 766 4 V 0 2 8 9 766 17 766 2 5 V 0 2 5 9 766 14 766 2 V 0 2 4 9 766 13 766 1 25 V 0 2 2 5 9 766 12 266 1 V 0 2 2 9 766 11 766 Table 5 Accuracy components single ended mode All values are Range of Reading Gain Error at FS mV Offset mV Accuracy at FS mV 10 V 0 2 20 19 531 39 531 Table 6 Noise performance differential mode Range Typical counts Least significant bitroot mean square LSBrms 20 V 2 0 30 10 V 2 0 30 5 V 3 0 45 4 V 3 0 45 2 5 V 4 0 61 2 V 5 0 76 1 25 V 7 1 06 1 V 8 1 21 26 USB 1208FS User s Guide Specifications Table 7 Noise performance single ended mode Range Typical Counts LSBrms 10 V 2 0 30 Analog output Table 8 Analog ou
18. gnal You can use it for two purposes Configure as an external clock input to externally source the A D conversions The SYNC terminal supports TTL level input signals of up to 50 kHz Configure as an output to synchronize with a second USB unit and acquire data from 16 channels Refer to the pinout diagrams on page 15 for the location of this pin For more information on synchronizing multiple units refer to page 23 Counter terminal The CTR connection pin 20 is input to the 32 bit external event Refer to the pinout diagrams on page 15 for the location of this pin The internal counter increments when the TTL levels transition from low to high The counter can count frequencies of up to 1 MHz Accuracy The overall accuracy of any instrument is limited by the error components within the system Quite often resolution is incorrectly used to quantify the performance of a measurement product While 12 bits or 1 part in 4096 does indicate what can be resolved it provides little insight into the quality of an absolute measurement Accuracy specifications describe the actual results that can be realized with a measurement device There are three types of errors which affect the accuracy of a measurement system offset gain nonlinearity The primary error sources in the USB 1208FS are offset and gain Nonlinearity is small in the USB 1208FS and is not significant as an error source with respect to offset and gain Figu
19. guide explains how to install configure and use the USB 1208FS so that you get the most out of its USB data acquisition features This user s guide also refers you to related documents available on our web site and to technical support resources Conventions in this user s guide For more information on Text presented in a box signifies additional information and helpful hints related to the subject matter you are reading Caution Shaded caution statements present information to help you avoid injuring yourself and others damaging your hardware or losing your data lt HH gt Angle brackets that enclose numbers separated by a colon signify a range of numbers such as those assigned to registers bit settings etc bold text Bold text is used for the names of objects on the screen such as buttons text boxes and check boxes For example 1 Insert the disk or CD and click the OK button italic text Italic text is used for the names of manuals and help topic titles and to emphasize a word or phrase For example The InstaCal installation procedure is explained in the Quick Start Guide Never touch the exposed pins or circuit connections on the board Where to find more information For additional information relevant to the operation of your hardware refer to the Documents subdirectory where you installed the MCC DAQ software C Program Files Measurement Computing DAQ by default or search for your device on our w
20. guration and acquire data from the analog inputs of both devices using one clock When the SYNC pin is configured as an output the internal A D pacer clock is sent to the screw terminal You can use this signal as a clock input to a second USB by connecting it to the SYNC pin of the second USB When used as a clock input the SYNC pin operates in one of two modes Continuous or Gated In the default Continuous mode a USB 1208FS ignores the first clock pulse in order to ensure adequate setup time Use this mode if the unit is being paced from a continuous clock source such as a generator In the Gated mode it is assumed that the clock signal will be held off for an adequate amount of time for setup to occur No clock pulses are ignored Use this mode if the USB 1208FS is set up as a slave and the source of the external clock is another USB The SYNC pin pin 19 is set for pacer output by default To set it to input requires a software command see Figure 15 on page 24 To synchronize a master USB 1208FS with a slave USB 1208FS and acquire data follow the steps below 1 Connect the SYNC pin of the master USB 1208FS to the SYNC pin of the slave USB 1208FS 2 Run nstaCal 3 From the PC Board List on the InstaCal main form double click on the USB 1208FS you want to use as a slave The Board Configuration dialog opens 23 USB 1208FS User s Guide Functional Details 4 Select Gated from the Ext Clock Type drop down list
21. hen Vows IVEZ SKET E SEE USB COMME A A a brn i Screw terminal wiring Main connector and pin out Analog input terminals CHO IN CH7 IN econocioncicn ri dad 15 Analog output terminals D A OUT 0 and D A OUT ln 18 Digital I O terminals Port AO to A7 and Port BO to B7 18 Power terminals ornon eeen a eN aa a Ei eoe 19 Calibration terminal nni renin iE E OR AS 19 Ground terminals ad 20 External trigger terminal sese ee eee ee eee 120 SYNC terminal T 1 20 Counter terminal casein scat AAA A nara haan 20 PS CCULACY A E EE eae Tas E Se Ss Sd a Te ta 20 USB 1208FS channel gain queue feature oo ee ceesecseeeecneesecseeeessecseesecsevsecsseeecsaecesesecseeseenaseeesaeeeeeaesaeeeeens 23 Synchronizing multiple Units s is cscs canes Ea lal e aE RE damm Damos prat 23 Chapter 4 Specificato S TTT 25 LST STT 25 DIGOR OUE sH ar 27 Disit linp t o tput s eneee eae test ea i reee oe eee E E eSa E Speeders 27 EX terial TT TTT 28 External clock input output krere ea ra aae res bd 28 O nseries eeste ioeiios iesen asesi eSEE EE VEES E a EEE aa Ea As tetsaa EE EESE eE EEE E tiene EE E E aster 29 No volatile memory sne o bie ae 29 USB 1208FS User s Guide General Environmental eee Mechanical TTT Main connector and TT 4 channel differential mode 8 channel single ended mode Declaration of Conformity Preface About this User s Guide What you will learn from this user s guide This user s
22. ighly recommends that you figure in a safety factor of 20 below this maximum current loading for your applications A conservative safe user maximum in this case would be in the 350 380 mA range Since laptop computers typically allow up to 100 mA the USB 1208FS in a fully loaded configuration may be above that allowed by the computer In this case you must determine the per pin loading in the application to ensure that the maximum loading criteria is met The per pin loading is calculated by simply dividing the 5 V by the load impedance of the pin in question Calibration terminal The CAL connection pin 16 is an output you should use only to calibrate the USB 1208FS Refer to the pinout diagrams on page 15 for the location of this pin Calibration of the USB 1208FS is software controlled via InstaCal 19 USB 1208FS User s Guide Functional Details Ground terminals The four analog ground AGND connections provide a common ground for all USB 1208FS input channels Four ground GND connections provide a common ground for the DIO TRIG_IN CTR SYNC and PC 5V connections Refer to the pinout diagrams on page 15 for the location of the AGND and GND terminal pins External trigger terminal The TRIG_IN connection pin 18 can be configured for either rising or falling edge Refer to the pinout diagrams on page 15 for the location of the TRIG_IN terminal pin SYNC terminal The SYNC connection pin 19 is a bidirectional I O si
23. marks or registered trademarks of Microsoft Corporation LabVIEW is a trademark of National Instruments CompactFlash is a registered trademark of SanDisk Corporation XBee and XBee PRO are trademarks of MaxStream Inc All other trademarks are the property of their respective owners Information furnished by Measurement Computing Corporation is believed to be accurate and reliable However no responsibility is assumed by Measurement Computing Corporation neither for its use nor for any infringements of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent or copyrights of Measurement Computing Corporation All rights reserved No part of this publication may be reproduced stored in a retrieval system or transmitted in any form by any means electronic mechanical by photocopying recording or otherwise without the prior written permission of Measurement Computing Corporation Notice Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for use in life support systems and or devices without prior written consent from Measurement Computing Corporation Life support devices systems are devices or systems which a are intended for surgical implantation into the body or b support or sustain life and whose failure to perform can be reasonably expected to result in injury Measurement Computing Corporation produ
24. nector LED Screw terminal banks 2 Screw terminal Pins 21 to 40 connector cable Figure 3 USB 1208FS external components 13 USB 1208FS User s Guide Functional Details USB connector The USB connector is on the right side of the USB 1208FS This connector provides 5 V power and communication The voltage supplied through the USB connector is system dependent and may be less than 5 V No external power supply is required LED The LED on the front of the housing indicates the communication status of the USB 1208FS It uses up to 5 mA of current and cannot be disabled The table below defines the function of the USB 1208FS LED LED Illumination LED Illumination Indication Steady green The USB 1208FS is connected to a computer or external USB hub Blinks continuously Data is being transferred Screw terminal wiring The USB 1208FS has two rows of screw terminals one row on the top edge of the housing and one row on the bottom edge Each row has 20 connections Pin numbers are identified in Figure 4 Pin 20 Pin 1 8900090000029 09989009 MEASUREMENT _ COMPUTING USB 1208FS 35E6900G0800000600090 rrr Pin 40 Pin 21 Figure 4 USB 1208FS Screw terminal pin numbers Screw terminal pins 1 20 The screw terminals on the top edge of the USB 1208FS pins 1 to 20 provide the following connections Eight analog input connections CHO IN to CH7 IN Two analog outpu
25. onal Details Theory of operation analog input acquisition modes The USB 1208FS can acquire analog input data in two different modes software paced and continuous scan Maximum throughput is system dependent Maximum throughput may be lower in Windows operating systems that predate Windows XP Software paced mode In software paced mode you can acquire one analog sample at a time You initiate the A D conversion by calling a software command The analog value is converted to digital and returned to the computer You can repeat this procedure until you have the total number of samples that you want from one channel The maximum throughput sample rate in software paced mode is system dependent Continuous scan mode In continuous scan mode you can acquire data from up to eight channels The analog data is continuously acquired and converted to digital values until you stop the scan Data is transferred in blocks of 31 samples from the USB 1208FS to the memory buffer on your computer The maximum continuous scan rate of 50 kS s is an aggregate rate The total acquisition rate for all channels cannot exceed 50 kS s You can acquire data from one channel at 50 kS s two channels at 25 kS s and four channels at 12 5 kS s You can start a continuous scan with either a software command or with an external hardware trigger event External components The USB 1208FS has the following external components as shown in Figure 3 USB con
26. ot drawn to scale Input Voltage Gain error 0 2 or 20 mV Gain error 0 2 or 20 mV lt U ae gt pa HRO Actual a Output Code 2048 4095 Figure 13 ADC Transfer function with gain error For example the USB 1208FS exhibits a typical calibrated gain error of 0 2 on all ranges For the 10 V range this would yield 10 V x 40 002 20 mV This means that at full scale neglecting the effect of offset for the moment the measurement would be within 20 mV of the actual value Note that gain error is expressed as a ratio Values near FS are more affected from an absolute voltage standpoint than are values near mid scale which see little or no voltage error Combining these two error sources in Figure 14 we have a plot of the error band of the USB 1208FS for the 10 V range This is a graphical version of the typical accuracy specification of the product The accuracy plots in Figure 14 are drawn for clarity and are not drawn to scale Input Voltage lIdeal 9 77 mV 20 mV deal deal 9 77 mV 20 mV Output Code Ideal 9 77 mV 20 mV gt Ideal gt FS Ideal 9 77 mV 20 mV gt Figure 14 Error band plot 22 USB 1208FS User s Guide Functional Details USB 1208FS channel gain queue feature The USB 1208FS s channel gain queue feature allows you to set up a scan sequence with a unique per channel gain setting and channel sequence The channel gain queue featu
27. re 11 shows an ideal error free USB 1208FS transfer function The typical calibrated accuracy of the USB 1208FS is range dependent as explained in the Specifications chapter on page 25 We use a 10 V range here as an example of what you can expect when performing a measurement in this range 20 USB 1208FS User s Guide Functional Details Input Voltage K Output Code 2048 4095 Figure 11 Ideal ADC transfer function The USB 1208FS offset error is measured at mid scale Ideally a zero volt input should produce an output code of 2048 Any deviation from this is an offset error Figure 12 shows the USB 1208FS transfer function with an offset error The typical offset error specification on the 10 V range is 9 77 mV Offset error affects all codes equally by shifting the entire transfer function up or down along the input voltage axis The accuracy plots in Figure 12 are drawn for clarity and are not drawn to scale Input Voltage Output Code 9 77 mV 4095 Figure 12 ADC transfer function with offset error Gain error is a change in the slope of the transfer function from the ideal and is typically expressed as a percentage of full scale Figure 13 shows the USB 1208FS transfer function with gain error Gain error is easily converted to voltage by multiplying the full scale FS input by the error 21 USB 1208FS User s Guide Functional Details The accuracy plots in Figure 13 are drawn for clarity and are n
28. re removes the restriction of using an ascending channel sequence at a fixed gain This feature creates a channel list which is written to local memory on the USB 1208FS The channel list is made up of a channel number and range setting An example of a four element list is shown in the table below Sample channel gain queue list Element Channel Range 0 CHO BIP10V 1 CHO BIP5V 2 CH7 BIP10V 3 CH2 BIPIV When a scan begins with the gain queue enabled the USB 1208FS reads the first element sets the appropriate channel number and range and then acquires a sample The properties of the next element are then retrieved and another sample is acquired This sequence continues until all elements in the gain queue have been selected When the end of the channel list is detected the sequence returns to the first element in the list This sequence repeats until the specified number of samples is gathered You must carefully match the gain to the expected voltage range on the associated channel otherwise an over range condition can occur Although this condition does not damage the USB 1208FS it does produce a useless full scale reading It can also introduce a long recovery time from saturation which can affect the next measurement in the queue Synchronizing multiple units You can run up to two USB 1208FS units on most computers You can connect the SYNC pin of two USB 1208FS units together in a master slave confi
29. rnal source Input clock rate 50 KHz maximum Clock pulse width Input mode 1 us min Output mode 5 us min Input leakage current Input mode 1 0 pA Input high voltage 4 0 V min 5 5 V absolute max Input low voltage 1 0 V max 0 5 V absolute min Output high voltage Note 7 IOH 2 5 mA 3 3 V min No load 3 8 V min Output low voltage Note 7 IOL 2 5 mA 1 1 V max No load 0 6 V max Note 7 SYNC is a Schmitt trigger input and is over current protected with a 200 Q series resistor 28 USB 1208FS User s Guide Specifications Counter Table 14 Counter specifications Pin name Note 8 CTR Counter type Event counter Number of channels 1 Input type TTL rising edge triggered Input source CTR screw terminal Resolution 32 bits Schmidt trigger hysteresis 20 mV to 100 mV Input leakage current uA Maximum input frequency 1 MHz High pulse width 500 ns min Low pulse width 500 ns min Input high voltage 4 0 V min 5 5 V absolute max Input low voltage 1 0 V max 0 5 V absolute min Note 8 CTR is a Schmitt trigger input protected with a 1 5K Q series resistor Non volatile memory Table 15 Non volatile memory specifications EEPROM 1 024 bytes EEPROM Configuration Address Range Access Description 0x000 0x07F Reserved 128 bytes system data 0x080 0x1FF Read write 384 bytes cal data 0x
30. shown here USB G 1 2 4 5 8 10 16 20 Full speed USB 2 0 Compliant Interface DIO Analog Input 8 single ended SPI 11 bit channels or 8 4 differential 12 bit channels v v o o a a w gt USB no o S o LA o b 3 3 v O o O 3 3 o 2 S Microcontroller 3 b o 2 9 E g o o Q 9 E E 9 2 z 9 ke Q YN Analog Output eS 2 channels 2 12 bit CAL CAL 32 bit Event Counter 1 1 channel Figure 2 USB 1208FS functional block diagram Software features For information on the features of InstaCal and the other software included with your USB 1208ES refer to the Quick Start Guide that shipped with your device USB 1208FS User s Guide Introducing the USB 1208F S Connecting a USB 1208FS to your computer is easy Installing a data acquisition device has never been easier The USB 1208FS relies upon the Microsoft Human Interface Device HID class drivers The HID class drivers ship with every copy of Windows that is designed to work with USB ports We use the Microsoft HID because it is a standard and its performance delivers full control and maximizes data transfer rates for your USB 1208FS No third party device driver is required The USB 1208FS is plug and play There are no jumpers to position DIP switches to set or interrupts to configure You can connect the USB 1208FS before or after you install the software and without powering down
31. software selectable Input ranges single ended mode 10 V G 2 Input ranges differential mode 20 V G l 10 V G 2 5V G 4 4 V G 5 2 5 V G 8 2 0 V G 10 1 25 V G 16 1 0 V G 20 Software selectable Throughput Note 2 Software paced 250 samples per second S s typ PC dependent Continuous scan 50 kilosamples per second kS s Channel gain queue Up to 16 elements Software configurable channel range and gain Resolution Note 3 Differential 12 bits no missing codes Single ended 11 bits CAL accuracy CAL 2 5 V 36 25 mV max Integral linearity error least significant bit LSB typ Differential linearity error 0 5 LSB typ Repeatability 1 LSB typ CAL current Source 5 milliamperes mA max Sink 20 uA min 100 uA typ Trigger source Software selectable External digital TRIG_IN Pacer source Software selectable Internal External SYNC rising edge triggered Programmed IO Note 1 Input current is a function of applied voltage on the analog input channels For a given input voltage Vin the input leakage is approximately equal to 8 181 V 12 WA 25 USB 1208FS User s Guide Specifications Note 2 Maximum throughput scanning to PC memory is machine dependent The rates specified are for Windows XP only Maximum rates on operating systems that predate XP may be less and must be determined through t
32. t connections D A OUT 0 to D A OUT 1 One external trigger source TRIG_IN One SYNC terminal for external clocking and multi unit synchronization SYNC One calibration terminal CAL Five analog ground connections AGND One ground connection GND One external event counter connection CTR USB 1208FS User s Guide Functional Details Screw terminal pins 21 40 The screw terminals on the bottom edge of the pins 21 to 40 provide the following connections Main connector and pin out 16 digital I O connections PortA0 to Port A7 and Port BO to Port B7 One power connection PC 5 V Three ground connections GND Connector type Screw terminal Analog input terminals CHO IN CH7 IN WDOWWDOOWDOWDOWDOWOOO DWDOWWDOWWOWOWDOWOWDOWOWOOO G G be TOMMY 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 GND Port B7 Port B6 Port B5 Port B4 Port B3 Port B2 Port B1 Port BO GND PC 5V GND Port A7 Port A6 Port A5 Port A4 Port A3 Port A2 Port A1 Port AO 8 channel single ended mode pin out Wire gauge range 16 AWG to 30 AWG ro EE ro oF 033022022022022 gt Pr Sz 9z Sz Gz eZz2904Z RKS of 033022022022022 E gt ZIOSIOTTOTTOITOIT xazv0o_z ZamZnnZerZ0o ODFOUOLOOLOOLOOLOOLOO ESeYZZOLLOLLOLLOLILOLL SOORT FOAL O0NFOOXDOIDOIDOXDO lt ODO Z E Morontyrne ODONOOTFNAO Arrrrrrrrrre DONODOTFTNNA COWWDOWWDOOWDOOWWWWWOO WDOOWDOOWDDOWDOOWOO
33. tput specifications Parameter Conditions Specification Resolution 12 bits 1 in 4096 Output range 0 4 096 V 1 mV per LSB Number of channels 2 Throughput Note 4 Software paced 250 S s single channel typical PC dependent Single channel continuous scan 10 kS s Dual channel continuous scan simultaneous update 5 kS s Power on and reset voltage Initializes to 000h code Output drive Each D A OUT 15 mA Slew rate 0 8V microsecond us typ Note 4 Maximum throughput scanning to PC memory is machine dependent The rates specified are for Windows XP only Maximum rates on operating systems that predate XP may be less and must be determined through testing on your machine Table 9 Analog output accuracy all values are Range Accuracy LSB 0 4 096 V 4 0 typ 45 0 max Table 10 Analog output accuracy components all values are Range of FSR Gain Error at FS mV Offset mV Accuracy at FS Note 5 mV 0 4 096 V 0 1 typ 0 9 max 4 0 typ 36 0 max 1 0 typ 9 0 max 4 0 typ 45 0 max Note 5 Negative offsets will result in a fixed zero scale error or dead band At the maximum offset of 9 mV any input code of less than 0x009 will not produce a response in the output Digital input output Table 11 Digital I O specifications Digital type CMOS Number of I O 16 Port AO through A7 Port BO through B7 Config
34. uration 2 banks of 8 Pull up pull down configuration All pins pulled up to Vs via 47K resistors default Positions available for pull down to ground Hardware selectable via zero ohm 2 resistors as a factory option Input high voltage 2 0 V min 5 5 V absolute max Input low voltage 0 8 V max 0 5 V absolute min Output high voltage 3 8 V min OH 2 5 mA Output low voltage 0 7 V max AOL 2 5 mA Power on and reset state Input 27 USB 1208FS User s Guide Specifications External trigger Table 12 Digital trigger specifications Parameter Conditions Specification Trigger source Note 6 External Digital TRIG_IN Trigger mode Software selectable Edge sensitive user configurable for CMOS compatible rising or falling edge Trigger latency 10 us max Trigger pulse width 1 us min Input high voltage 4 0 V min 5 5 V absolute max Input low voltage 1 0 V max 0 5 V absolute min Input leakage current 1 0 HA Note 6 TRIG_IN is a Schmitt trigger input protected with a 1 5 kilohm kQ series resistor External clock input output Table 13 External clock l O specifications Parameter Conditions Specification Pin name SYNC Pin type Bidirectional Software selectable direction Output default Outputs internal A D pacer clock Input Receives A D pacer clock from exte
35. uting product that is damaged due to misuse or any reason may be eligible for replacement with the same or similar device for 50 of the current list price I O boards face some harsh environments some harsher than the boards are designed to withstand Contact MCC to determine your product s eligibility for this program 30 Day Money Back Guarantee Any Measurement Computing Corporation product may be returned within 30 days of purchase for a full refund of the price paid for the product being returned If you are not satisfied or chose the wrong product by mistake you do not have to keep it These warranties are in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for a particular application The remedies provided herein are the buyer s sole and exclusive remedies Neither Measurement Computing Corporation nor its employees shall be liable for any direct or indirect special incidental or consequential damage arising from the use of its products even if Measurement Computing Corporation has been notified in advance of the possibility of such damages HM USB 1208FS doc 3 USB 1208FS User s Guide Trademark and Copyright Information TracerDAQ Universal Library Measurement Computing Corporation and the Measurement Computing logo are either trademarks or registered trademarks of Measurement Computing Corporation Windows Microsoft and Visual Studio are either trade
36. your computer first When you connect an HID to your system your computer automatically detects it and configures the necessary software You can connect and power multiple HID peripherals to your system using a USB hub You can run up to two USB 1208FS units on most computers You can connect your system to various devices using a standard four wire cable The USB connector replaces the serial and parallel port connectors with one standardized plug and port combination You do not need a separate power supply module The USB automatically delivers the electrical power required by each peripheral connected to your system Data can flow two ways between a computer and peripheral over USB connections 10 Chapter 2 Installing the USB 1208FS What comes with your USB 1208FS shipment As you unpack your USB 1208ES verify that the following components are included Hardware USB 1208FS shown with cable USB cable 2 meter length Additional documentation In addition to this hardware user s guide you should also receive the Quick Start Guide available in PDF at www mcecdag com PDFmanuals DA O Software Quick Start pdf This booklet supplies a brief description of the software you received with your USB 1208FS and information regarding installation of that software Please read this booklet completely before installing any software or hardware Unpacking the USB 1208FS As with any electronic device you should t
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