USB-1408FS User's Guide - Electrical and Computer Engineering
Contents
1. Figure 3 7 Differential voltage example common mode voltage of 7 V 3 5 USB 1408FS User s Guide Functional Details Since 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 Table 3 2 shows some possible inputs and the expected results Table 3 2 Sample inputs and differential results CI CN SV po y OW 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 Main connector and pin out diagrams on page 3 3 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 1 mV per LSB when setting the output voltage levels Digital I O terminals Port AO to A7 and Port BO to B72. 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 Main connector and pin out diagrams on page 3 3 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 I O terminals to detect the state of any TTL level input Refer to the switch shown in Figure 3 8 and the schematic shown in Figure 3 9 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 PORT AO Figure 3 8 Digital connection Port AO detecting the state of a switch 3 6 USB 1408FS User s Guide Functional Details z pr GND 5V Figure 3 9 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 mccdaq com signals signals pdf Power terminals The PC 5V connection pin 30 draws power from the USB connector This terminal is a 5 V output that is supplied by the host computer Refer to the Main connector and pin out diagrams on page 3 3 for the location of this pin Caution The 5 V terminal is an output Do not connect to an external power supply or you may damage the USB 1408FS and
3. Availability of the Windows XP SPI USB 1 1 and 2 0 update This article is available at support microsoft com kbid 822603 To connect the USB 1408FS 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 1408FS When you connect the USB 1408FS for the first time a series of Found New Hardware popup balloons Windows XP or dialogs other Windows versions open as the USB 1408FS is detected by your computer Found New Hardware A Found New Hardware x l l USE Composite Device USE Composite Device Found Hew Hardware i Found New Hardware x Interface O Interface O It is normal for multiple dialogs to open when you connect the USB 1408FS for the first time For additional information refer to the Notes on installing and using the USB 1408FS that was shipped with the USB 1408FS 2 2 USB 1408FS User s Guide Installing the USB 1408FS The last popup balloon or dialog states Your new hardware is installed and ready to use and the LED on the USB 1408FS should flash and then remain lit This indicates that communication is established between the USB 1408FS and your computer i Found New Hardware E Your new hardware 15 installed and ready to use On most computers you can install up to two USB 1408FS units If you need to connect more tha
4. A conservative safe user maximum in this case would be 280 mA Since laptop computers typically allow up to 100 mA the USB 1408FS 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 External trigger terminal The TRIG_IN connection pin 18 can be configured for either rising or falling edge Refer to the Main connector and pin out diagrams on page 3 3 for the location of this pin Counter terminal The CTR connection pin 20 is input to the 32 bit external event Refer to the Main connector and pin out diagrams on page 3 3 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 3 7 USB 1408FS User s Guide Functional Details 2 5VREF terminal The 2 5VREF connection pin 16 is an output terminal that supplies 2 5 volts The images below show the 2 5VREF pin configured as the voltage source for channel 0 a a gt Y Pin 1 CHO IN HI Single ended measurement Differential measurement SYNC terminal The SYNC connection pin 19 is a bidirectional I O signal You can use it for two purposes Configure as an external clock input to externally source th
5. CTR is a Schmitt trigger input protected with a 1 5K Q series resistor Non volatile memory Table 13 Non volatile memory specifications EEPROM 1 024 bytes EEPROM Configuration Address Range 0x000 0x07F 128 bytes system data 0x080 0x 1FF 384 bytes cal data 0x200 0x3FF 512 bytes user area 4 4 USB 1408FS User s Guide Specifications Microcontroller Table 14 Microcontroller specifications High performance 8 bit RISC microcontroller 16 384 words 2 048 bytes Power Table 15 Power specifications Supply current Note 10 a E T 5V USB power available Connected to self powered hub 4 5 V min 5 25 V max Note 11 Connected to externally powered root port hub Connected to bus powered hub 4 1 V min 5 25 V max Output current Note 12 Connected to self powered hub 420 mA max Connected to externally powered root port hub Connected to bus powered hub Note 10 This is the total current requirement for the USB 1408FS which includes up to 10 mA for the status LED Note 11 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
6. EC 61000 4 8 1994 Power Frequency Magnetic Field immunity Criteria A Declaration of Conformity based on tests conducted by Chomerics Test Services Woburn MA 01801 USA in February 2006 Test records are outlined in Chomerics Test Report EMI4445 06 We hereby declare that the equipment specified conforms to the above Directives and Standards Ai hoeg 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 mccdaq com
7. Figure 3 12 ADC Transfer function with gain error Figure 3 12 shows an example of a USB 1408FS transfer function with a calibrated gain error of 0 02 or 2 mV This means that at full scale neglecting the effect of offset for the moment the measurement would be within 2 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 3 13 we have a plot of the error band of the USB 1408FS for the 10 V range This is a graphical version of the typical accuracy specification of the product The accuracy plots in Figure 3 13 are drawn for clarity and are not drawn to scale MPU YONGE ideal 2 44 mV 2 mV I0V Ideal Ideal 2 44 mV 2 my 2 44 mv Output Code 0 8192 16383 Ideal 2 44 mV 2mV gt Ideal gt 10V Ideal 2 44 mV 2 mV gt Figure 3 13 Error band plot 3 10 USB 1408FS User s Guide Functional Details USB 1408FS channel gain queue feature The USB 1408FS 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 feature 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 1408FS Each element of the channel list is made
8. 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 1408FS It uses up to 5 mA of current and cannot be disabled Table 3 1 defines the function of the USB 1408FS LED Table 3 1 LED Illumination LED Illumination Indication 2222 Steady green The USB 1408FS is connected to a computer or external USB hub Blinks continuously Data is being transferred Screw terminal wiring The USB 1408FS 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 3 2 Pin 20 Pin 1 MEASUREMENT COMPUTING USB 1408FS 000000000000 Pin 40 Pin 21 Figure 3 2 USB 1408FS Screw terminal pin numbers Screw terminal pins 1 20 The screw terminals on the top edge of the USB 1408FS pins to 20 provide the following connections Eight analog input connections CHO IN to CH7 IN Two analog output 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 voltage output source 2 5VREF Five analog ground connections AGND One ground connection GND One external event counter connection CTR 3 2 USB 1408FS User s Guide Functional Details Screw terminal pins 21 40 The screw terminals on
9. possibly the computer The maximum total output current that can be drawn from all USB 1408FS 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 1408FS to your computer draws 80 mA of current from the USB 5 V supply Once you start running applications with the USB 1408FS 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 1408F S 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 1408FS USB 5 V supply as follows USB 1408FS 80 mA 16 DIO 2 5 mA ea 2 AO 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 highly recommends that you figure in a safety factor of 20 below this maximum current loading for your applications
10. the bottom edge of the pins 21 to 40 provide the following connections Main connector and pin out Connector type Analog input terminals CHO IN CH7 IN OOODWDWODGOOGOOOWODGOOOOOOOD WOOWWOWOOOWOOOODGOOOOOOOD OCOMARMONTONANKOMRAKRONTONS TFONNNANMDNDNMNAANNANAAAA NOWMOFANTO Nontnnro mmmn LILLI QOvrerer er rer re AtOerr re reer Z200000000ZOZ0000000O0 OOOAAOAOARAHAOLRORAAHALOE 8 channel single ended mode 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 Wire gauge range 16 AWG to 30 AWG oO 2 0 e Sz Gz Qz Gz oL aoz3as2ios2o22o22 XZVLODZZIIIRNEINANZ ZOO ESTEAOD SOITOTTOTTOL 0ONFO XAAXIOOXIVOOXIOOXOO ODONONFNANO AF aio D0ONOLNTNN ODODODOOOGDWOWDDOOGOOWOO ODOOWVGDOOWOODOODOOOOO O 0 0 MOL TOMO OO 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 5 V GND Port A7 Port A6 Port A5 Port A4 Port A3 Port A2 Port A1 Port AO 4 channel differential mode pin out You can connect up to eight analog input connections to the screw terminal containing pins 1 to 20 CHO IN through CH7 IN Refer to the Main connector and pin out 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 di
11. 2 2 Calibrating me USB IA08E Sros ora E E S A ON 2 3 Chapter 3 Functional Detalla 3 1 Theory of operation analog input acquisition modes occccccnnnnnnnnnnnnnnnnnnnnnnninennnnnnnnnnnnnnnnnnnnnnnn nn nn nn rra n nana 3 1 Soltware paced Mode it A id AA tdi 3 1 bala to Neo OGG A A A A nes eam tingd T E tell dace umancentaetuess es 3 1 External O e nO Re ee 3 1 UN AAA A Nh A A a hae pan Sah ay 3 2 A A A A 3 2 Sr AA A eee ne eee ee ene 3 2 Mam CONNEClOr and DOUT 2 05 42 2518 E rasp isis 3 3 Analog input terminals CHO TIN CHTIN ti 3 3 Analog output terminals D A OUT 0 and D A OUT TD ocoooononcnanananananananananononononononnnnnnnnnnnnnnnnnnnnnnno nono non non nn nnnn nn nn nonononnnnos 3 6 Digital O terminals Port AO to A7 and Port BO to B ii bbs 3 6 POSEE EEA bc See ee OAS ne ne Ue sn are ge cr me Op gee 3 7 is AA A A tet teresa halatat nite 3 7 Cont a econ Peni ener erie ans ene ei eter ene tet acento ene tire Rett Oe ent tier ec Ons ene er er OMe et ter acento eee eres 3 7 AZ 2 VISES termina 3220 ssa 5s gh dact aaa bli 3 8 SLN GC MMA aaa cree aerated arene ed a eee alae ener A 3 8 Ground terminal untada 3 8 A 3 8 USB I408FS channel gain queue 16ature od ii 3 11 SYNC MEOMEZ INS AMID UASB A AAA AAA ARE AAA EA 3 11 Chapter 4 Te A O dc cede aye enue 4 1 AOT AA 6 II aT Er RCC a a ree een ne re 4 ADA SOUPS LE aepscacs seer A A as cio Sas waa Ras ae A ae a Ea 4 2 Dista pur Opus iii 4 3 Ds eee cee eee ner mnae cece lee R A A a 4 3 Exter
12. C pin of the second USB unit When used as a clock input the SYNC pin operates in one of two modes Continuous or Gated The mode is software selectable using nstaCal In the default Continuous mode the USB 1408FS ignores the first clock pulse in order to ensure adequate setup time Use Continuous 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 Gated mode if you want to use the USB 1408FS unit as a slave and the source of the external clock 1s another USB unit To synchronize a master USB 1408FS with a slave USB 1408FS and acquire data from the analog inputs of both devices using one clock follow the steps below 1 Connect the SYNC pin of the master USB 1408FS to the SYNC pin of the slave USB 1408FS 2 Run nstaCal 3 From the PC Board List on the InstaCal main form double click on the USB 1408FS you want to use as a slave The Board Configuration dialog opens 3 11 USB 1408FS User s Guide Functional Details 4 Select Gated from the Ext Clock Type drop down list Est Clock Type Continuous Gated be 5 Set the Universal Library EXTCLOCK option with cbAInScan AInScan for the slave USB 1408FS to enable pacing from the master USB device This InstaCal option does not affect internally paced acquisition I
13. 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 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 Note 12 Output current refers to the total amount of current that can be sourced from the USB 5 V analog outputs and digital outputs General Table 16 General specifications Device type USB fal speed Tan SB 1 1 USB 2 0 Environmental Table 17 Environmental specifications Operating temperature range 0 to 70 C Storage temperature range 40 to 70 C 0 to 90 non condensing USB 1408FS User s Guide Specifications Mechanical Table 18 Mechanical specifications Dimensions 79 millimeters mm long x 82 mm wide x 25 mm high USB cable engi Main connector and pin out Table 19 Main connector specifications Wire gauge range 16 AWG to 30 AWG 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 29 Port A4 6 AGND 26 Port A5 T CH2 IN HI 27 Port A6 8 CH2 IN LO 28 Port 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 2 5VREF 36 P
14. USB based data acquisition products The USB 1408FS is a USB 2 0 full speed device that is supported under popular Microsoft Windows operating systems The USB 1408FS is fully compatible with both USB 1 1 and USB 2 0 ports Refer to the Be sure you are using the latest system software note in Chapter 2 Installing the USB 1408FS to make sure you are using the latest USB drivers The USB 1408FS features eight analog inputs two 12 bit analog outputs 16 digital I O connections and one 32 bit external event counter The analog inputs are software configurable for either eight 13 bit single ended inputs or four 14 bit differential inputs The 16 digital I O lines are independently selectable as input or output in two 8 bit ports The 32 bit counter can count TTL pulses A SYNC synchronization input output line allows you to pace the analog input acquisition of one USB module from the clock output of another The USB 1408FS is powered by the 5 volt USB supply from your computer No external power is required The USB 1408FS is shown in Figure 1 1 I O connections are made to the screw terminals located along each side of the USB 1408FS Figure 1 1 USB 1408FS 1 1 USB 1408FS User s Guide Introducing the USB 1408FS USB 1408FS block diagram USB 1408FS functions are illustrated in the block diagram shown here USB Full speed USB 2 0 Compliant Interface Analog Input 8 single ended 13 bit channels or 4 di
15. USB 1408FS Eight Analog Inputs Two Analog Outputs and 16 Digital I O Full speed USB 2 0 device User s Guide MEASUREMENT COMPUTING USB 1408FS USB based Analog and Digital I O Module User s Guide A A MEASUREMENT COMPUTING Document Revision 3 May 2006 Copyright 2006 Measurement Computing Corporation Your new Measurement Computing product comes with a fantastic extra Management committed to your satisfaction Refer to www mccdag com execteam html for the names titles and contact information of each key executive at Measurement Computing 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 two missions To offer the highest quality computer based data acquisition control and GPIB hardware and software available at the best possible price To offer our customers superior post sale support FREE Whether providing unrivaled telephone technical and sales support on our latest product offerings or continuing that same first rate support on older products and operating systems we re committed to you Lifetime warranty Every hardware product manufactured by Measurement Computing Corporation is warranted against defects in materials or workmanship for the life of the product Products found defective are rep
16. aired or replaced promptly Lifetime Harsh Environment Warranty We will replace any product manufactured by Measurement Computing Corporation that is damaged even due to misuse for only 50 of the current list price I O boards face some tough operating conditions some more severe than the boards are designed to withstand When a board becomes damaged just return the unit with an order for its replacement at only 50 of the current list price We don t need to profit from your misfortune By the way we honor this warranty for any manufacturer s board that we have a replacement for 30 Day Money Back Guarantee You may return any Measurement Computing Corporation product 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 Please call for an RMA number first No credits or returns accepted without a copy of the original invoice Some software products are subject to a repackaging fee 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 i
17. e A D conversions The SYNC terminal supports TTL level input signals of up to 48 kHz Configure as an output to synchronize with a second USB 1408FS and acquire data from 16 channels For information on synchronizing multiple units refer to page 3 11 Ground terminals The four analog ground AGND connections provide a common ground for all USB 1408FS input channels Four ground GND connections provide a common ground for the DIO TRIG_IN CTR SYNC and PC 5V connections Refer to the Main connector and pin out diagrams on page 3 3 for the location of these pins Accuracy The overall accuracy of any instrument is limited by the error components within the system Quite often resolution 1s incorrectly used to quantify the performance of a measurement product While 14 bits or 1 part in 16383 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 1408FS are offset and gain Nonlinearity is small in the USB 1408FS and 1s not significant as an error source with respect to offset and gain Figure 3 10 shows an example of an ideal error free USB 1408FS transfer function The typical calibrated accuracy of the USB 1408FS is rang
18. e channel range and gain Resolution Note 3 Differential 14 bits no missing codes Single ended integral linearity or igi LSB Differential linearity enor OSI Bo Absolute accuracy long term drif Note 4 SURE accuracy pm ma gt SVREF output current pin 16 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 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 testing on your machine 4 1 USB 1408FS User s Guide Specifications Note 3 The ADS7871 converter only returns 13 bits 0 to 8192 codes in single ended mode Note 4 Extrapolating the long term drift accuracy specifications will provide the approximate long term drift of the USB 1408FS intermediate input ranges Table 2 Accuracy differential mode Table 3 Accuracy single ended mode Absolute Accuracy 25 C tmV Absolute Accuracy 0 to 50 C tmV 10 98 49 08 Table 4 Noise performance differential mode Range Typical counts Least significant bitroot mean square LSBrms 20 V 1 21 10 V 1 21 4 V 10 1 51 2 5 V 12 1 81 2 V 14 2 12 A 33 Table 5 Noise performance single ended mode Typical Counts E CO E Analog output Table 6 Analog o
19. e dependent as explained in the Specifications chapter of this document We use a 10 V range here as an example of what you can expect when performing a measurement in this range 3 8 USB 1408FS User s Guide Functional Details Inout Voltage Output Code Figure 3 10 Ideal ADC transfer function The offset error is measured at mid scale Ideally a zero volt input should produce an output code of 8192 Any deviation from this is an offset error Figure 3 11 shows an example of a USB 1408FS transfer function with a 2 44 mV offset error 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 3 11 are drawn for clarity and are not drawn to scale Inout Voltage 10V r Ideal Offset 2 44mV 4 ay SC meray Output Code ht A 16383 Actual a 10V Figure 3 11 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 Gain error is easily converted to voltage by multiplying the full scale FS input by the error 3 9 USB 1408FS User s Guide Functional Details The accuracy plots in Figure 3 12 are drawn for clarity and are not drawn to scale Input Voltage Gain error 0 02 or 2 mV Ideal 10V FWA Gain error 0 02 or 2 mV Actual Output Code 16383 10V
20. f Measurement Computing Corporation has been notified in advance of the possibility of such damages HM USB 1408FS doc 11 Trademark and Copyright Information TracerDAQ Universal Library nstaCal Harsh Environment Warranty 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 trademarks or registered trademarks of Microsoft Corporation LabVIEW is a trademark of National Instruments CompactFlash is a registered trademark of SanDisk Corporation 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 pr
21. fferential 14 bit channels USB Microcontroller Anang Cupur 2 channels 12 bit Screw terminal I O connector 10 2 UUOI O Jeur MIJIS TRIG_IN Event Counter 1 1 channel 32 bit Figure 1 2 USB 1408FS functional block diagram Software features For information on the features of InstaCal and the other software included with your USB 1408FS refer to the Quick Start Guide that shipped with your device The Quick Start Guide 1s also available in PDF at www mecdag com PDFmanuals DAQ Software Quick Start pdf Check http www mcedaq com download htm for the latest software version or versions of the software supported under less commonly used operating systems 1 2 USB 1408FS User s Guide Introducing the USB 1408FS Connecting a USB 1408FS to your computer is easy Installing a data acquisition device has never been easier The USB 1408FS 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 1408FS No third party device driver is required The USB 1408FS is plug and play There are no jumpers to position DIP switches to set or interrupts to configure You can connect the USB 1408FS before or after you install the software and without powering down y
22. fferential mode each analog input has 14 bit resolution When configured for single ended mode each analog input has 13 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 this mode Figure 3 3 illustrates a typical single ended measurement connection 3 3 USB 1408FS User s Guide Functional Details Figure 3 3 Single ended measurement connection The following example shows the single ended measurement data acquired by TracerDAQ HE Data Acquisition TracerDAQ TracerDAQ aQ File Edit Run Help le xi 9 W batter 6 0 K 6 0 0 E 40 E Si ven E 2 0 DS 1 1 1 1 1 1 1 2 55 39 2 55 41 2 55 43 2 55 45 2 55 47 2 55 49 Time Ml channe o Acquisition Rate secs sample f o Set Rate Number of points displayed f10 10 seconds Using a rate faster than 1 sec sample may lead to timing inaccuracies CREATE Zoom Of Figure 3 4 Measurement data 9 volt plotted on TracerDAQ s Strip Chart Single ended measurements using d
23. ifferential 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 1s 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 HI CH2 IN HI or CH3 IN HI The wire carrying the reference signal connects to CHO IN LO CH1 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 14 bits Differential mode input voltage ranges are 20 V 10 V 5 V 4 V 2 5 V 2 0 V 1 25 V and 1 0 V USB 1408FS User s Guide Functional Details 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
24. ing to avoid damage from static electricity Before removing the USB 1408FS 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 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 mccdaq com PDFmanuals DAQ Software Quick Start pdf Installing the hardware Be sure you are using the latest system software Before you connect the USB 1408FS make sure that you are using the latest versions of the USB drivers Before installing the USB 1408FS download and install the latest Microsoft Windows updates In particular when using Windows XP make sure you have XP Hotfix KB822603 installed This update is intended to address a serious error in Usbport sys when you operate a USB device You can run Windows Update or download the update from www microsoft com downloads details aspx familyid 733dd867 56a0 4956 b7fe e85b688b7f86 amp displaylang en For more information refer to the Microsoft Knowledge Base article
25. n two USB 1408FS units to your computer contact Tech Support by phone 508 946 5100 fax 508 946 9500 or email techsupport measurementcomputing com Caution Do not disconnect any device from the USB bus while the computer is communicating with the USB 1408FS or you may lose data and or your ability to communicate with the USB 1408FS If the LED turns off If the LED is illuminated but then turns off the computer has lost communication with the USB 1408FS 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 Allow the USB 1408FS to operate for at least 30 minutes before using the device This warm up time is required to achieve the specified rated accuracy of measurements Calibrating the USB 1408FS The USB 1408FS is shipped fully calibrated Calibration coefficients are stored in EEPROM Return the device to Measurement Computing Corporation when calibration is required The normal calibration interval is once per year 2 3 Chapter 3 Functional Details Theory of operation analog input acquisition modes The USB 1408FS can acquire analog input data in two different modes software paced and continuous scan 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 re
26. nal CLOCK input OU CD UU acerca ica 4 4 COUMIEE SEC OM E E E E E E E E E E E E 4 4 USB 1408FS User s Guide Ns et a te ee ee ee ere eee er eee ere eee ee eee ee 4 4 IVT CL OC Oli tolerado bd io 4 5 PONO oa E seis access me ge Ics Nw A a sora A Gas A 4 5 CONST A beac aia ls Rate Doin thee Mehl Saale T Ne sha ho ian thetic a ae Fics 4 5 Environme nm al ana A A lodoan asin aeeatlt 4 5 Mecha A A OU ESET a NE RODD EC Te RE 4 6 Mal conacc LOT AIIM OWL pan chee tec init 4 6 A A 4 6 channel sinole ended mode o ad th gS Lat 4 6 Preface About this User s Guide What you will learn from this user s guide This user s guide explains how to install configure and use the USB 1408FS and 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 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 b
27. oduct 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 products 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 111 Table of Contents Preface About this USeCr Ss Guile ices ites rn aad aes eater aati ee raettd vi Wat you will lea from this user s da vi COnvVenMOns IMS SEL S CUE AAA AAA AA A A vi Wheretotmndmorcinionnma ion 6 5402 0c cxbsssaaed Ar vi Chapter 1 Introducing the USB 1408P Sica E a E 1 1 USB lt 1408S ES block AT rt A AEA 1 2 DOM Wale Te AUN S aia ta a la Dacia 1 2 Connecting a USB 1408FS to your computer 1S CAS V oooccccnnncnncnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nn nn nn n nn nr rr 1 3 Chapter 2 Installing the USB 1408 FS 000ai a citadas 2 1 What comes with your USB 1408FS shipment ooocccccccccnnnnnnnnnnnnnnnnnnnnnnnnonnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnos 2 1 I ABW Ailes es ors O T 2 1 Additional dC INA ON 2 3205 204 ants ead i Sahota ae dated a res ects tie eat 2 1 Unpack me the USA a ee 2 2 Instale ts Sota eb 2 2 l stalme he Dard Ware A A AA AA A ts
28. ort 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 T 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 2 5VREF 36 Port B4 17 GND 37 Port B5 18 TRIG IN 38 Port B6 19 SYNC 39 Port B7 20 CTR 40 GND 4 6 C 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 1408FS 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 IEC 61000 4 2 1995 Electrostatic Discharge immunity Criteria C IEC 61000 4 3 1995 Radiated Electromagnetic Field immunity Criteria A
29. our computer first When you connect an HID to your system your computer automatically detects 1t and configures the necessary software You can connect and power multiple HID peripherals to your system using a USB hub 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 1 3 Chapter 2 Installing the USB 1408FS What comes with your USB 1408FS shipment As you unpack your USB 1408FS verify that the following components are included Hardware USB 1408FS 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 DAQ Software Quick Start pdf This booklet supplies a brief description of the software you received with your USB 1408FS and information regarding installation of that software Please read this booklet completely before installing any software or hardware 2 1 USB 1408FS User s Guide Installing the USB 1408FS Unpacking the USB 1408FS As with any electronic device you should take care while handl
30. t only affects scans that use the EXTCLOCK option An example of a master slave configuration is shown here For the slave USB 1408FS Set the Universal Library EXTCLOCK option Master i with cbAInScan AlnScan USB 1408FS l USB 1408FS This configures the SYNC pin on the slave unit for input and enables pacing from the master USB 1408FS Figure 3 14 Configuring for synchronous data acquisition When you are operating one USB 1408FS do not set the EXTCLOCK option unless you are using an external clock for A D pacing 3 12 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 A D converter type fd Successive approximation type CHx to GND 10 volts V max single ended mode linear operation differential mode Imputimpedance 22K Ohms S Input current Note 1 Vin 10 V 70 microamperes uA typ Vin 10V 94 uA typ Number of channels 8 single ended 4 differential software selectable Input ranges single ended mode 10 V G 2 A ees Input ranges differential mode 20V G 10 V G 2 ES V 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 Software paced Throughput Note 2 Software paced 250 samples per second S s typ PC dependent 48 kilosamples per second kS s Channel gain queue Up to 16 elements Software configurabl
31. turned 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 converted to digital values and written to an on board FIFO buffer until you stop the scan The FIFO buffer is serviced in blocks as the data is transferred from the USB 1408FS to the memory buffer on your computer The maximum continuous scan rate of 48 kS s is an aggregate rate The total acquisition rate for all channels cannot exceed 48 kS s You can acquire data from one channel at 48 kS s two channels at 24 kS s and four channels at 12 kS s You can start a continuous scan with either a software command or with an external hardware trigger event External components The USB 1408FS has the following external components as shown in Figure 3 1 USB connector LED Screw terminal banks 2 LED 2 Screw terminal Pins 1 to 20 E Screw terminal Pins 21 to 40 USB connector Figure 3 1 USB 1408FS external components 3 1 USB 1408FS User s Guide Functional Details USB connector The USB connector is on the right side of the USB 1408FS This connector provides 5 V power and communication The voltage supplied through the USB connector 1s system dependent
32. up of a channel number and range setting An example of a four element list is shown in Table 3 3 Table 3 3 Sample channel gain queue list siement cnanne rane E e E BIPSV BIPIOV BIPIV When a scan begins with the gain queue enabled the USB 1408FS 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 of the associated channel otherwise an over range condition can occur Although this condition does not damage the USB 1408FS 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 connect the SYNC pin of two USB 1408FS units together in a master slave configuration and acquire data from the analog inputs of both devices using one clock By default the SYNC pin pin 19 is set for pacer output and sends the internal pacer A D clock signal to the screw terminal You can use this signal as a clock input to a second USB unit by connecting it to the SYN
33. up to Vs via 47 K resistors default Positions available for pull down to configuration ground Hardware selectable via zero ohm Q resistors as a factory option IOH 2 5 mA Output low voltage 0 7 V max IOL 2 5 mA External trigger Table 10 Digital trigger specifications Trigger source Note 7 External digital TRIG_IN Trigger mode Software Edge sensitive user configurable for CMOS compatible rising or selectable falling edge Trigger teny oo Trigger pulse width input high voltage input tow voltage hpu leakage current Note 7 TRIG IN is a Schmitt trigger input protected with a 1 5 kilohm KQ series resistor USB 1408FS User s Guide Specifications External clock input output Table 11 External clock I O specifications C A T Faye AN gt Software selectable direction ee A Clock pulse wid e a e Finputhigh voltage AO Vin 55 Vabsolutemax Finputtow voltage dCi maxs 05 V absolute min Output high voltage Note 8 O qq co e Output Tow voltage Note 8 Note 8 SYNC is a Schmitt trigger input and is over current protected with a 200 Q series resistor Input clock rate 48 KHz maximum Counter section Table 12 Counter specifications Resolution 32 bits Schmidt trigger hysteresis 20 mV to 100 mV Input leakage current uA High pulse width Low pulse width 500 ns min Input high voltage 4 0 V min 5 5 V absolute max 1 0 V max 0 5 V absolute min Note 9
34. utput specifications Parameter Specification Reommion SSS o Omputra OP 96 VT mV per LSB PNumberofchamels h Software paced o Throughput Note 5 Software paced 250 S s single channel typical PC dependent Single channel continuous scan 10 kS s Dual channel continuous scan 5 kS s simultaneous update Power on and reset voltage ON OV 20 mV typ initializes to 000h code Fach D A OUT HIS mA ETT A DATO USB 1408FS User s Guide Specifications Note 5 Maximum throughput scanning from 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 7 Analog output accuracy 0 to 4 096 V 4 0 typ 45 0 max Table 8 Analog output accuracy components Range Of FSR Gain Error at FS tmV Offset tmV Accuracy at FS tmV Note 6 0 to 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 6 Zero scale offsets may result in a fixed zero scale error producing a dead band digital input code region In this case changes in digital input code at values less than 0x040 may not produce a corresponding change in the output voltage The USB 1408FS offset error is tested and specified at code 0x040 Digital input output Table 9 Digital I O specifications CMOS 16 Port AO through A7 Port BO through B7 2 banks of 8 All pins pulled
35. utton 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 nstaCal 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 MCC s Specifications USB 1408FS the PDF version of the Electrical Specification Chapter in this guide is available on our web site at www mccdag com pdfs USB 1408ES pdf MCC s DAQ Software Quick Start is available on our web site at www inccdag com PDFmanuals DAQ Software Quick Start pdf MCC s Guide to Signal Connections is available on our web site at www mecdag com signals signals pdf MCC s Universal Library User s Guide is available on our web site at www mccdag com PDFmanuals sm ul user guide pdf MCC s Universal Library Function Reference is available on our web site at www meccdag com PDFmanuals sm ul functions pdf MCC s Universal Library for LabVIEW User s Guide is available on our web site at www mccdaq com PDFmanuals SM UL LabVIEW pdf USB 1408FS User s Guide this document 1s also available on our web site at www mccdag com PDFmanuals USB 1408ES pdf vi Chapter 1 Introducing the USB 1408FS This user s guide contains all of the information you need to connect the USB 1408FS to your computer and to the signals you want to measure The USB 1408FS is part of the Measurement Computing brand of
36. you input a 4 V pp sine wave 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 3 5 4V Measured Signal CHHI ov 4V 8V Differential 8V 4V CHLO TATA y 4V Figure 3 5 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 3 6 15V oe AN SAAG Measured Signal CHHI 8V Differential 8V CHLO 11V AJA 7V Figure 3 6 Differential voltage example common mode voltage of 11 V gt lt 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 3V to 11V Voltages between 10 V and 3 V are resolved but those below 10 V are clipped see Figure 3 7 3V x Measured Signal CHHI _7y lav A 11V 8V Differential 7V 3V CHLO 7V y 11V
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