USB-1208FS User's Guide
Contents
1. 4V Measured Signal CHHI oy A 4V 8V Differential 8V 4V CHLO MANDA y 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 CHHI 11V 8V Differential 8V CHLO 11V VAVvA i T V Y 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 i Measured Signal CHHI _7y UN A 11V 8V Differential 7V 3V Y CHLO V d M 11V Figure 8 Differential voltage example common mode voltage of 7 V 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 t2. 2 5 mA Output low voltage IOL 0 7 V max 2 5 mA 28 USB 1208FS User s Guide Specifications External trigger Table 12 Digital trigger specifications Trigger source Note 6 External Digital TRIG IN Trigger mode Software selectable Edge sensitive user configurable for CMOS compatible rising or falling edge Trigger teny lwsmw Trigger pulse width si input high voltage A0 V min 55V absoute maxs Umwtwwdue lOVmm03Vaohtemi Input leakage current BEEN 0 uA 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 I O specifications Pin name Pin type Software selectable direction Input clock rate Clock pulse width Input leakage current Input high voltage Input low voltage Output high voltage Note 7 Output low voltage Note 7 ON E S Oooo ETT SO manda OOOO min 5 5 V absoluto max LOV max 0 5 V absolute min o Note 7 SYNC is a Schmitt trigger input and is over current protected with a 200 Q series resistor 29 USB 1208FS User s Guide Specifications Counter Table 14 Counter specifications Number of channel 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 byte
3. 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 1s another USB The SYNC pin pin 19 is set for pacer output by default 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 InstaCal 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 4 Select Gated from the Ext Clock Type drop down list 24 USB 1208FS User s Guide Functional Details Est Clock Type Continuous Gated h 5 Set the Universal Library EXTCLOCK option with coAInScan 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 1s shown below Set the Universal Library Master 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
4. 1208FS User s Guide Trademark and Copyright Information TracerDAQ Universal Library 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 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 witho
5. CAL 32 bit Event Counter 1 channel Figure 2 USB 1208FS functional block diagram Software features For information on the features of nstaCal and the other software included with your USB 1208FS refer to the Quick Start Guide that shipped with your device The Quick Start Guide 1s also available in PDF at www mccedaq com PDFmanuals DAQ Software Quick Start pdf Check www mccdaq com download htm for the latest software version USB 1208FS User s Guide Introducing the USB 1208FS 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 1s 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 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 connect your system to various de
6. 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 ZEMI3948 04 We hereby declare that the equipment specified conforms to the above Directives and Standards Uer 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. 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 16 for the location of this pin Calibration of the USB 1208FS is software controlled via InstaCal 20 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 16 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 16 for the location of the TRIG IN terminal pin 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 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 16 for the location of this pin For more information on synchronizing multiple units refer to page 24 Counter terminal The CTR connection pin 20 is input to the 32 bit external event Refer to the
8. low as 4 1 V Note 11 This refers to the total amount of current that can be sourced from the USB 5 V analog outputs and digital outputs General Table 18 General specifications Deveye USB20fil spec Device compatibility EN 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 0 to 90 non condensing Mechanical Table 20 Mechanical specifications 79 millimeters mm long x 82 mm wide x 25 mm high USB cable length Main connector and pin out Table 21 Main connector specifications Wire gauge range 16 AWG to 30 AWG 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 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 Po
9. not set the EXTCLOCK option unless you are using an external clock for A D pacing 25 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 ESS 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 input impedance O ome input current Note 1 Number of channels Input ranges single ended mode Input ranges differential mode 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 8 single ended 4 differential software selectable gain Resolution Note 3 CAL accuracy Integral linearity error Eg least significant bit LSB typ Differential linearity error NENNEN 0 5 LSB typ Repeatability 1 LSB typ CAL current Source 5 milliamperes mA max 20 pA min 100 pA p 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 W
10. pinout diagrams on page 16 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 1s 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 1s not significant as an error source with respect to offset and gain Figure 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 26 We use a 10 V range here as an example of what you can expect when performing a measurement in this range 21 USB 1208FS User s Guide Functional Details Input Voltage Output Code Figure 11 Ideal ADC transfer function The USB 1208FS offset error is measured at mid scale Ideally a zero volt input should produce an ou
11. 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 shown here USB G 1 2 4 5 8 10 16 20 Full speed USB 2 0 Compliant Interface Analog Input o o 8 single ended g 16 11 bit channels ct o Port A or D O 3 a 4 differential s DIO 12 bit channels m g O 3 Port B 9 Analog output 3 O O USB 2 channels gt O S SYNC Microcontroller 12 bit d TRIG IN O D CAL
12. 0 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 deal 9 77mV 20 mV FS Ideal deal 9 77mV 20 mv a Output Code O 2048 4095 Ideal 9 77mV 20 mV Ideal FS Ideal 9 77mV 20 mV gt Figure 14 Error band plot 23 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 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 1208FS The channel list 1s 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 eme mme mg 0 CH i PLO BIPSV BIPIOV BIPIV When a scan begins with the gain queue enabled the USB 1208FS reads the first element sets the app
13. 08FS User s Guide A A DS A 30 AS AI A tea sel EE ob tae 30 o A A ME 31 ENVIO MEM SAA AAA 31 Mechanical A ios 31 MAA Le 31 A Channel diterentral MOOG na a ia 32 S channel sinegle ended MOE A ia 32 Declaration of Conforimilty coii cie eio pU PES VADE SUE EPREE ia aai aa aaan aiaiai kaia 33 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 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 d 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 nstaCal installation
14. A 26 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 testing on your machine Note 3 The AD7870 converter only returns 11 bits 0 2047 codes in single ended mode Table 2 Accuracy differential mode X gt 201 Table 3 Accuracy single ended mode Accuracy LSB io 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 0 9 766 14 766 9 766 13 766 4125V 02 9 766 12 266 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 0 2 20 19 531 39 531 Table 6 Noise performance differential mode Typical counts Least significant bitroot mean square LSBrms 030 030 045 045 4 0 61 076 4 4 2 0 2 20 2 10 2 2 5 2 2 2 9 2 2 7 1 06 2T USB 1208FS User s Guide Specifications Table 7 Noise performance single ended mode Typical Counts Analog output Table 8 Analog output specifications Resolution 000 Eis 1 in 4096 Output range 4098 1 mV per ESB Number of channel UR Throughput Note 4 Software paced 250 S s single ch
15. SB 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 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 2096 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
16. USB 1208FS Low cost USB based Module with 8 Channels 12 bit Input User s Guide MEASUREMENT COMPUTING USB 1208FS USB based Analog and Digital I O Module User s Guide A AN MEASUREMENT COMPUTING Document Revision 5 July 2007 Copyright 2007 Measurement Computing Corporation Your new Measurement Computing product comes with a fantastic extra Management committed to your satisfaction Refer to www mccdaq 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 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 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 repaired or replaced promptly Lifetime Harsh Environment Warranty We will replace any product manufactured by Measurement C
17. annel typical PC dependent single channel continuous scan 10 kS s Dual channel continuous scan 5 kS s simultaneous update Power on and reset voltage Initializes to 000h code Output drive Each D A OUT 15 mA Slew rate BERNER 0 8 V 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 x 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 CMOS 16 Port A0 through A7 Port BO through B7 2 banks of 8 All pins pulled up to Vs via 47K resistors default Positions available for pull down to ground Hardware selectable via zero ohm Q 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 IOH 3 8 V min
18. ght 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 222 Steady green The USB 1208FS is connected to a computer or external USB hub Blinks continuously Data 1s 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 690009660900009099000 MEASUREMENT COMPUTING USB 1208FS 0069060999000096900990 ILL A 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 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 calibration terminal CAL Five analog ground connections AGND One ground connect
19. he first time For additional information refer to the Notes on installing and using the USB 1208FS that was shipped with the USB 1208FS 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 12 USB 1208FS User s Guide Installing the USB 1208FS 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 1208FS 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 13 Chapter 3 Functional Details Theory of operation analog input acquisition modes The USB 1208FS can acquire analog input data in two different modes software paced and cont
20. he input range criteria 18 USB 1208FS User s Guide Functional Details The table below shows some possible inputs and the expected results Sample inputs and differential results Ga eo R9 SV my E E S S 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 16 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 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 16 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 s
21. hown 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 PORT AO Figure 9 Digital connection Port AO detecting the state of a switch 19 USB 1208FS User s Guide Functional Details GND TOV 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 mccdaq 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 16 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 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 U
22. inuous 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 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 connector LED Screw terminal banks 2 Screw terminal LED Pins 1 to 20 Screw terminal Pins 21 to 40 connector cable Figure 3 USB 1208FS external components 14 USB 1208FS User s Guide Functional Details USB connector The USB connector is on the ri
23. ion GND One external event counter connection CTR 15 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 16 digital I O connections PortAO to Port A7 and Port BO to Port B7 One power connection PC 5 V Three ground connections GND Main connector and pin out Wire gauge range 16 AWG to 30 AWG v oO Z OS ZZAZZAZZAZZ O O O O mE O 5 OQooo 20 o ao EE 9z 9z 9z CF Owormooa oda ooa ooa oo a oo YN gt 00Zz ZO ZANZ ZO0o0 2 LE gzaozcforrorrocorrorr Skene oA ONFOOLHOALOOLZOOLZOOLZOO ODOR K QO LO sr CO CN ON K O LO TON ooooooooooooooooooQ oooooooooooooooooooQ QooooooooooooooooooQo C O OO l XO LO TANT OQQON OL TON T N 60 00 00 9 6 00 00 60 O N AN NAN AN AN AN AN S80 0 0 09 0 00 9 NN NQQNQN gt gt F DO LO TOA TO RN KQO 10 SE CO CN TO Tr QD LO sr CO CN CO LO MAANA _ lt ILIIII OMAN o dq daad xd Occccctcctcch s Occccccctc Occcccccc a Occecccccc o0ooo ooo oozZ2zoz2zooooooo090 Zoooooooozozoooooooo Onannanaanaanoacdacoananonanannn Ono nnonnononnooonococaaononocaonann 8 channel single ended mode pin out 4 channel differential mode pin out Analog input terminals CHO IN CH7 IN 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 pinout diag
24. linp ts Sota 12 Installing the Nard Wate A AAA E O EA A 12 Chapter 3 FUNCIONA Detalls isoeo mm 14 Theory of operation analog input acquisition modes occcccnnnnnnnnnnnnnnnnnnnnnnnninnnnnnnnnnnnnnnnnnnnn eene eene nn rra 14 SOWA Paced modesto 14 C ontTiulols Scanmode ro arista sio sea e aia 14 E sternal compotie nis oes bs deme uentus pedis O cecenilert 14 USB como Diocese HT 15 LA B A 15 DCT PP o scit tL MD LEM e ces ete aL Ri DNE 15 Nam connector and pii QUE 3 4 eye rela caos 16 Amaloe mput terminals CHO IN C H IN iii 16 Analog output terminals D A OUT 0 and D A OUT TD coooonnnnnanananananananananananon nono nonoonnnnnnnn nono nono nono nonnnnn non non a ananas 19 Digital D Otermimals Port A0 10 4 7 and Port B0 30 Bai A E 19 POWER de ETOTHOS encontar Mideese nai tedesca inita ibus Eua ic veil ands cutis iaa utei o 20 Calbration temida c M NS Cate iS 20 Ground terminals aon on ciet ES Ve AA steil T Ms AAA AA EA tutta ad od tue a 21 External trie eer Terminal aa 21 SNC Ter miele O 21 COUDLEETCEIHHOT A NE 21 ACOG Y anena a OO 21 USB 1208FS channel pain queue cd dt dit oda 24 Synehrontzrme multiple UASD AA AI AA utet AA 24 Chapter 4 SPECINCIUONS Pienc n EE 26 ADIO A o REORUM RT 26 A ONDU NN T TOO TOO E TEUER 28 IB res TEE OTI UU A OE td 28 External t dl 29 F xtemial Clock Input Opus Loses 29 ota i 30 Non FO ERU DI SIRILO S RE TENTE Uc 30 USB 12
25. omputing 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 if Measurement Computing Corporation has been notified in advance of the possibility of such damages HM USB 1208FS doc 3 USB
26. procedure is explained in the Quick Start Guide Never touch the exposed pins or circuit connections on the board Where to find more information The following electronic documents provide helpful information relevant to the operation of the USB 1208FS MCC s Specifications USB 1208FS the PDF version of the Specifications chapter in this guide is available on our web site at www mccdag com pdfs USB 1208ES pdf MCC s Quick Start Guide is available on our web site at www mcecdaq com PDFmanuals DAQ Software Quick Start pdf MCC s Guide to Signal Connections is available on our web site at www mcecdaq com signals signals pdf MCC s Universal Library User s Guide is available on our web site at www mccdaq com PDFmanuals sm ul user guide pdf MCC s Universal Library Function Reference is available on our web site at www mccdaq com PDFmanuals sm ul functions pdf MCC s Universal Library for LabVIEW User s Guide is available on our web site at www mccdag com PDFmanuals SM UL LabVIEW pdf USB 1208FS User s Guide this document 1s also available on our web site at www mccdaq com PDFmanuals USB 1208ES pdf 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
27. rams 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 CHF 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 16 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 Single 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 mea
28. ropriate 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 connect the SYNC pin of two USB 1208FS units together in a master slave configuration 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 1s 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
29. rt 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 32 Ce Declaration of Conformity Manufacturer Measurement Computing Corporation Address 10 Commerce Way Suite 1008 Norton MA 02766 USA Category X 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 IEC 1000 4 2 1995 Electrostatic Discharge immunity Criteria C IEC 1000 4 3 1995 Radiated Electromagnetic Field immunity Criteria A EC 1000 4 4 1995 Electric Fast Transient Burst immunity Criteria C EC 1000 4 5 1995 Surge immunity Criteria A IEC 1000 4 6 1996 Radio Frequency Common Mode immunity Criteria A IEC 1000 4 8 1994 Magnetic Field immunity Criteria A EC 1000 4 11 1994 Voltage Dip and Interrupt
30. s Microcontroller Table 16 Microcontroller specifications High performance 8 bit RISC microcontroller Program Memory 16 384 words 2 048 byte Power Table 17 Power specifications Supply current Note 9 SOA 5V USB power available Note 10 Connected to self powered hub 4 5 V min 5 25 V max Connected to externally powered root port hub 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 Note 9 This is the total current requirement for the USB 1208FS which includes up to 10 mA for the status LED 30 USB 1208FS User s Guide Specifications Note 10 Se f 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 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
31. sured 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 12 bits Differential mode input voltage ranges are 20 V 10 V 5 V 4 V 42 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 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 1s suited for the 10 V input range see Figure 6 17 USB 1208FS User s Guide Functional Details
32. tput code of 2048 Any deviation from this is an offset error Figure 12 shows the USB 1208ES 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 FS d 2 M d Offset 9 77mV A JED 2048 977m Actual Ny e Fx t uds Ld Output Code E FS 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 22 USB 1208FS User s Guide Functional Details The accuracy plots in Figure 13 are drawn for clarity and are not drawn to scale Input Voltage Gain error 0 2 or 20 MV Gain error 0 2 or 20 mV FS Actual Output Code 4095 FS 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 0 002 20 mV This means that at full scale neglecting the effect of offset for the moment the measurement would be within 2
33. ut 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 Table of Contents Preface ADOUE THIS Users GUIA e 7 What you will hear from this user s odas 7 Conventions HL IS USES sese tote t eat ato v ta adu im totg etu out tando Med uU eS du RET UU a INT RES DRESS 7 Where to Tina mote T0 OLIEOLIOR E osea ele bite A A eats 7 Chapter 1 Introducing the USB 1208E Saito OE a RR PUE CE epo alado Rl o cR Ea BAR nie 8 USB 1208 ES DIOCK ATA oi coo teer o es berba Pott o E PO EVE SEE Rebus belt A RE beet totes pu PRETI IE U IU P cuU dU 9 SOM ae TC dM DOS oti aoa ta aita mE MIDI ane M NIE UEM EE Ea 9 Connecting a USB 1208FS to your computer 1S easy eene e nennen eene nennen nennen nens 10 Chapter 2 Installing th USB 1208FPS 00000 iia cateo 11 What comes with your USB 1208FS shipment ooocccccnncnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnoss 11 LATAS sere aries aa 11 Adatttonabdocumient tfOfiac dede Ede bs a itat dal tu ge Lite ques ctun teu etie 11 Unpaid 12 nistal
34. vices 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 mccdaq com PDFmanuals DAQ 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 11 USB 1208FS User s Guide Installing the USB 1208FS Unpacking the USB 1208FS As with any electronic device you should take 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 an
35. y 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 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 1208ES for the first time a series of Found New Hardware popup balloons Windows XP or dialogs other Windows versions opens as the USB 1208FS is detected by your computer Found Hew Hardware USB Human Interface Device sl AJ Found New Hardware Ix USB Human Interface Device Found Mew Hardware Interface O ij Found New Hardware x Interface O It is normal for multiple dialogs to open when you connect the USB 1208ES for t
Download Pdf Manuals
Related Search