USB-1208LS User`s Guide
Contents
1. Parameter Conditions Specification Trigger source Note 4 External digital TRIG IN Trigger mode Software selectable Level sensitive user configurable for TTL level high or low input Trigger latency Burst 25 us min 50 us max Trigger pulse width Burst 40 us min Input high voltage 3 0 V min 15 0 V absolute max Input low voltage 0 8 V max Input leakage current 1 0 uA Note 4 TRIG IN is protected with a 1 5KOhm series resistor Counter Counter type Event counter Number of channels 1 Input source CTR screw terminal Input type TTL rising edge triggered Resolution 32 bits Schmidt trigger hysteresis 20 mV to 100 mV Input leakage current uA Maximum input frequency 1 MHz High pulse width 500 ns min Low pulse width 500 ns min Input low voltage 0 V min 1 0 V max Input high voltage 4 0 V min 15 0 V max Non volatile memory Memory size 8192 bytes Memory configuration Address Range Access Description 0x0000 Ox17FF Read Write A D data 4K samples 0x1800 Ox1EFF Read Write User data area Ox1F00 OxlFEF Read Write Calibration data Ox1FFO OxIFFF Read Write System data 4 3 USB 1208LS User s Guide Specifications Power Parameter Conditions Specification Supply current Note 5 20 mA 5V USB power available Note 6 Connected to Self Powered Hub 4 5 V min 5 25 V max Connected to Bus Po2. You can connect up to eight analog input connections to the screw terminal containing pins 1 to 20 CH0 IN through CH7 IN Refer to the pinout diagrams on page 3 4 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 1s 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 GND The input range for single ended mode is 10V No other ranges are supported in single ended mode Figure 3 3 illustrates a typical single ended measurement connection 3 4 USB 1208LS User s Guide Functional Details Y Figure 3 3 Single ended measurement connection The following image shows the single ended measurement data acquired by TracerDAQ EM TracerDAQ Strip Chart _ Of x AR File Edt View Run Help SISTER gis ese x Acquisition Rate secs sample FE Set Rate Number of points displayed 100 1 minutes 40 seconds Using a
3. If the LED turns off If the LED is illuminated but then turns off the computer has lost communication with the USB 1208LS 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 2 2 Chapter 3 Functional Details Theory of operation analog input acquisition modes The USB 1208LS can acquire analog input data in three different modes software paced continuous scan and burst 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 Software pacing is limited by the 20 mS round trip requirement of a USB interrupt type endpoint operation The maximum throughput sample rate in software paced mode is 50 S s 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 1208LS to the memory buffer on your computer The maximum continuous scan rate of 1 2 kS s is an aggregate rate The total acquisition rate
4. 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 1208LS 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 Chapter 4 Specifications Typical for 25 C unless otherwise specified Specifications in italic text are guaranteed by design Analog input Parameter Conditions Specification A D converter type Successive approximation type Input voltage range for linear operation CHx to GND 10 V max single ended mode Input common mode voltage range for CHx to GND 10 V min 20 V max linear operation differential mode Absolute maximum input voltage CHx to GND 40V max Input current Note 1 Vin 10V 70A typ Vin 0V 12nA typ Vin 10 V 94uA typ Input impedance 122K Ohms Number of channels 8 single ended 4 differential software selectable Input ranges single ended mode 10V G 2 Input ranges differential mode 20V G 1 10V G 2 5V G 4 4V G 5 2 5V G 8 2 0V G 10 1 25V G 16 1 0V G 20 Software selectable Throughput Software paced 50 S s Continuous scan 1 2 kS s Burst scan to 4 K 8 kS s sample FIFO Channel gain queue
5. EN 55011 1990 CISPR 11 Radiated and Conducted emissions Immunity EN61326 Annex A JEC 1000 4 2 1995 Electrostatic Discharge immunity Criteria A EC 1000 4 3 1995 Radiated Electromagnetic Field immunity Criteria A EC 1000 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 May 2004 Test records are outlined in Chomerics Test Report EMI3733 04 We hereby declare that the equipment specified conforms to the above Directives and Standards i hore Carl Haapaoja Director of Quality Assurance Measurement Computing Corporation 10 Commerce Way Suite 1008 Norton Massachusetts 02766 508 946 5100 Fax 508 946 9500 E mail info mccdag com www mccdag com
6. 2 5 9 766 12 266 1V 0 2 2 9 766 11 766 Table 4 Accuracy components single ended mode all values are Range of Reading Gain Error at FS Offset mV Accuracy at FS mV mV 10 V 0 2 20 19 531 39 531 Analog output Parameter Conditions Specification D A converter type PWM Resolution 10 bits 1 in 1024 Maximum output range 0 5 Volts Number of channels 2 voltage output Throughput Software paced 100 S s single channel mode 50 S s dual channel mode Power on and reset voltage Initializes to 000h code Maximum voltage Note 3 No load Vs 1 mA load 0 99 Vs 5 mA load 0 98 Vs Output drive Each D A OUT 30 mA Slew rate 0 14 V mS typ Note 3 Vs is the USB bus 5V power The maximum analog output voltage is equal to Vs at no load V is system dependent and may be less than 5 volts 4 2 USB 1208LS User s Guide Specifications Digital input output Digital type 82C55 Number of I O 16 Port AO through A7 Port BO through B7 Configuration 2 banks of 8 Pull up pull down configuration All pins pulled up to Vs via 47K resistors default Positions available for pull down to ground Hardware selectable via zero ohm 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 2 5 mA 3 0 V min Output low voltage IOL 2 5 mA 0 4 V max External trigger
7. Up to 8 elements Software configurable channel range and gain Resolution Note 2 Differential 12 bits no missing codes Single ended 11 bits CAL accuracy CAL 2 5V 0 05 typ 0 25 max Integral linearity error 1 LSB typ Differential linearity error 0 5 LSB typ Repeatability 1 LSB typ CAL current Source 5 mA max Sink 20 uA min 200 nA typ Trigger Source Software selectable External digital TRIG IN 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 Vin 12 uA Note 2 The AD7870 converter only returns 11 bits 0 2047 codes in single ended mode 4 1 USB 1208LS User s Guide Specifications Table 1 Accuracy differential mode Range Accuracy LSB 20 V 5 1 10 V 6 1 5 V 8 1 4 V 9 1 2 5 V 12 1 2 V 14 1 1 25 V 20 1 1 V 24 1 Table 2 Accuracy single ended mode Range Accuracy LSB 10 V 4 0 Table 3 Accuracy components differential mode all values are Range of Reading Gain Error at FS Offset mV Accuracy at FS mV mV 20 V 0 2 40 9 766 49 766 10 V 0 2 20 9 766 29 766 5 V 0 2 10 9 766 19 766 4 V 0 2 8 9 766 17 766 2 5 V 0 2 5 9 766 14 766 2 V 0 2 4 9 766 13 766 1 25 V 0 2
8. 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 iii Table of Contents Preface About this User s Guide 2 nene eee dereud ce ee setae cee recu innen renun vi What you will learn from this user s guide ssssssesseseeeeneeeeneenn nennen enne nennen nnne vi Conventions in this user s guide ccceeccesseescessceesceeceseceseceaecsaecaeecaeecaeeecesaesseeeseseseeeenseenseeeseceaecaecnaeceeeaeeenes vi Where to find more information esses ener nenn nnne reinen enne nre vi Chapter 1 Introducing the USB 1208LS ccecceseeeceeeseeeeeeeeeeeseeeeeneeseeeseeeseseeneeseseseeeseseeeaesesesneeseseeeeansnseneeens 1 1 USB 1208LS block diagram eene nennen nnne E nennen 1 2 Software Teatures oa os cea metti ds m lalate dieti esc tto electi tos 1 2 Connecting a USB 1208LS to your computer is easy sesssssssssseseeee eene nre enne nnns 1 3 Chapter 2 Installing the USB 1208LSS ntn ere
9. is 500 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 1208LS to your computer draws 20 mA of current from the USB 5 V supply Once you start running applications with the USB 1208LS each DIO bit can draw up to 2 5 mA and each analog output can draw 30 mA The maximum amount of 5 V current available for experimental use over and above that required by the USB 1208LS is the difference between the total current requirement of the USB device 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 1208LS USB 5 V as follows USB 1208LS 20 mA 16 DIO 2 5 mA ea 2 AO 30 mA ea 120 mA For an application running on a PC or powered hub the maximum available excess current is 500 mA 120 mA 380 mA This number is the total maximum available current at the PC 5V screw terminals Measurement Computing highly recommends that you figure in a safety factor of 20 below this maximum current loading for your applications A conservative safe user maximum in this case would be in the 300 320 mA range Since laptop computers typically allow up to 100 mA the USB 12
10. of the USB 1208LS Figure 1 1 USB 1208LS 1 1 USB 1208LS User s Guide Introducing the USB 1208LS USB 1208LS block diagram USB 1208LS functions are illustrated in the block diagram shown here USB1 1 Analog Input 8 SE 11 bit channels or 4 Diff 12 bit channels Compliant Interface USB Analog Output Microcontroller 10 bit 2 channels Screw terminal I O connector 32 bit Event Counter 1 channel 82C55 DIO Screw terminal I O connector Figure 1 2 USB 1208LS Functional block diagram Software features For information on the features of JnstaCal and the other software included with your USB 1208LS refer to the Quick Start Guide that shipped with your device The Quick Start Guide is also available in PDF at www mccdaq com PDFmanuals DAQ Software Quick Start pdf Check www mccdag com download htm for the latest software version or versions of the software supported under less commonly used operating systems USB 1208LS User s Guide Introducing the USB 1208LS Connecting a USB 1208LS to your computer is easy Installing a data acquisition device has never been easier The USB 1208LS 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 yo
11. 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 1208LS are offset and gain Nonlinearity is small in the USB 1208LS and is not significant as an error source with respect to offset and gain Figure 3 10 shows an ideal error free USB 1208LS transfer function The typical calibrated accuracy of the USB 1208LS is range 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 9 USB 1208LS User s Guide Functional Details Input Voltage N Output Code 2048 4095 FS Figure 3 10 Ideal ADC transfer function The USB 1208LS offset error is measured at mid scale Ideally a zero volt input should produce an output code of 2048 Any deviation from this is an offset error Figure 3 11 shows the USB 1208LS 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 accurac
12. the product The accuracy plots in Figure 3 13 are drawn for clarity and are not drawn to scale Input Voltage Ideal 4 9 77mV 20 mV Ideal Ideal 9 77mV 20 mV Output Code Ideal 9 77MV 20 mv gt Ideal FS Ideal 9 77MV 20 mV gt Figure 3 13 Error band plot USB 1208LS User s Guide Functional Details USB 1208LS channel gain queue feature The USB 1208LS 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 1208LS The channel list is made 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 Element Channel Range 0 CHO BIP1OV to 1 CHO BIP5V 2 CH7 BIP10V 3 CH2 BIP1V pS When a scan begins with the gain queue enabled the USB 1208LS 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
13. 08LS 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 Ground terminals The 10 ground GND connections are identical and provide a common ground for all USB 1208LS functions Refer to the pinout diagrams on page 3 4 for the location of the GND terminal pins 3 8 USB 1208LS User s Guide Functional Details Calibration terminal The CAL connection pin 16 is an output you should use only to calibrate the USB 1208LS Refer to the pinout diagrams on page 3 4 for the location of this pin Calibration of the USB 1208LS is software controlled via InstaCal Trigger terminal The TRIG_IN connection pin 18 is an external digital trigger input You can configure this terminal with software for either trigger high or trigger low Counter terminal Pin 20 CTR is input to the 32 bit external event Refer to the pinout diagrams on page 3 4 for the location of this pin The internal counter increments when the TTL levels transition from low to high The counter can count frequencies of up to 1 MHz Accuracy The overall accuracy of any instrument is limited by the error components within the system Quite often resolution is incorrectly used to quantify the performance of a measurement
14. 3 4 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 Figure 3 8 Digital connection Port AO detecting the state of a switch 3 7 USB 1208LS User s Guide Functional Details LT Figure 3 9 Schematic showing switch detection by digital channel Port AO GND 5V 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 5 V connection pin 30 is on the bottom screw terminal of the USB 1208LS Refer to the pinout diagrams on page 3 4 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 5V terminal is an output Do not connect to an external power supply or you may damage the USB 1208LS and possibly the computer The maximum total output current that can be drawn from all USB 1208LS connections power analog and digital outputs
15. I 24 Port A3 5 CH1 IN LO 25 Port A4 6 GND 26 Port A5 7 CH2 IN HI 27 Port A6 8 CH2 IN LO 28 Port A7 9 GND 29 GND 10 CH3 IN HI 30 PC 5V 11 CH3 IN LO 31 GND 12 GND 32 Port BO 13 D A OUT 0 33 Port B1 14 D A OUT 1 34 Port B2 15 GND 35 Port B3 16 CAL 36 Port B4 17 GND 37 Port B5 18 TRIG IN 38 Port B6 19 GND 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 GND 23 Port A2 4 CH2 IN 24 Port A3 5 CH3 IN 25 Port A4 6 GND 26 Port A5 7 CH4 IN 27 Port A6 8 CH5 IN 28 Port A7 9 GND 29 GND 10 CH6 IN 30 PC 5V 11 CH7 IN 31 GND 12 GND 32 Port BO 13 D A OUT 0 33 Port B1 14 D A OUT 1 34 Port B2 15 GND 35 Port B3 16 CAL 36 Port B4 17 GND 37 Port B5 18 TRIG IN 38 Port B6 19 GND 39 Port B7 20 CTR 40 GND 4 5 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 1208LS 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 B
16. IN One external event counter connection CTR Seven GND connections GND One calibration terminal CAL 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 Connector type Screw terminal Wire gauge range 16 AWG to 30 AWG 3 3 USB 1208LS User s Guide Functional Details 14 D AOUT 1 13 D A OUT 0 12 GND 11 CH3 IN LO 10 CH3 IN HI 7 CH2INHI 6 GND 5 CH1INLO 4 CH1INHI 2 CHOINLO CHO IN HI 18 TRIG_IN 14 D AOUT 1 13 D A OUT O 12 GND 11 CH7 IN 10 CH6 IN 9 GND 8 CH5IN 7 CHAIN 6 GND 5 CH3 IN 4 CH2IN 3 GND 2 CH1IN CHO IN 1 20 CTR 19 GND 18 TRIG IN 17 GND 16 CAL 15 GND 20 CTR 19 GND 17 GND 16 CAL 15 GND ooooooooooooooo0o0o00QQ ooooooooooooO0O0O0Oo0O0000 oooooo0o00000000000000 WODOOGDOOWDOPGWOOWDOWOO 995995989598N8NSNQANSN S9S SSOSOSPEORNNNNQANRNAN nw 10 CO CN eo PI QO LO st CO CN OO l Oo L0 SF CO CN O mamamana g terres o225m gnadn o z44X42ux4 Occccccccthrxccoccococccc zEtEttttttzhiztttttttt ZooooooooZzozoooooooo O60000000ZOZoooooooo Oadcaaaonaaonooa onraannauaaao Oncaaoaaoaaoaoaoaaoanaoaoauauao 4 channel differential mode pin out 8 channel single ended mode pin out Analog input terminals CHO IN CH7 IN
17. USB 1208LS USB based Analog and Digital I O Module User s Guide MEASUREMENT COMPUTING USB 1208LS USB based Analog and Digital I O Module User s Guide A j IMEASUREMENT COMPUTING Document Revision 2 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 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 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 repaired or replaced promptly Lifetime Harsh E
18. V are clipped see Figure 3 7 3V ii Measured Signal CHHI _7y _ 11V 8V Differential 7V 3V CHLO 7V 11V Figure 3 7 Differential voltage example common mode voltage of 7 V 3 6 USB 1208LS 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 CHHI CHLO Result 20 V OV Invalid 15 V 5 V Invalid 10 V OV 10 V 10 V 10 V 20 V OV 10 V 10 V OV 20 V 20 V 10 V 10 V 20 V 10 V OV 10 V 15 V 5 V 20 V 20 V 0 20 V For more information on analog signal connections For more information on single ended and differential inputs refer to the Guide to Signal Connections this document is available on our web site at www mccdaq com signals signals pdf Digital I O terminals Port A0 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
19. alog 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 is suited for the 10 V input range see Figure 3 5 TM Measured Signal CHHI ov 4V 8V Differential 8V 4V CHLO 4V Y 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 Measured Signal cHHui 11V n 8V Differential 8V cHLO 11V P i 7V BIFA Figure 3 6 Differential voltage example common mode voltage of 11V 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
20. ay be less than 5V No external power supply is required LED The LED on the front of the housing indicates the communication status of the USB 1208LS It uses up to 5 mA of current and cannot be disabled Table 3 1 defines the function of the USB 1208LS LED Table 3 1 LED illumination When the LED is It indicates Steady green The USB 1208LS is connected to a computer or external USB hub Blinks continuously Data is being transferred Blinks three times Initial communication is established between the USB 1208LS and the computer Blinks at a slow rate The analog input is configured for external trigger The LED stops blinking and illuminates steady green when the trigger is received 3 2 USB 1208LS User s Guide Functional Details Screw terminal wiring The USB 1208LS 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 69000906000009000009 vvs x d a a d LLbd 00806099900009900999 prd 1 Pin 21 1 Pin 40 Figure 3 2 USB 1208LS Screw terminal pin numbers Screw terminal pins 1 20 The screw terminals on the top edge of the USB 1208LS 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_
21. cde See Stee edie cede etre ite opina eii co ree a es 2 1 What comes with your USB 1208LS shipment sse eene ener 2 1 Hat Wate CLP 2 1 Additional documenta tion ssscssacezs 52 ord ad he ERE i PURIS REIR RE A EE T ag e FIXES eS EE E AR dou EEA 2 1 Unpacking the USB 1208LS 4 eee eet teen tee re e Pet i e be eee eed 2 1 Installimg the Softwares 5 usce eee tetendit pie etaient ie indie d tes 2 2 Installing the hardware E etie eie deh tete a Pe 2 2 Chapter 3 Functional Detalls i Loses tee eee ieeeteo Deut duret a anaa ara aaia eere dere 3 1 Theory of operation analog input acquisition modes ssssssseseseeeeeeeeneen eene 3 1 Software paced ModE moros saen He PERTH I GEHE EA TS ER e OR Re ea aad ETHER Continuous scan mode B rst scan mode ie tec etd ence itii ee E cele sa eene heec etate coved eod nep e Nonne d i be ede AER Bb se rot se E External components eh ente ava it eese as ia ate s USB Contectorx oce d bp etie he rp ba hadi ee ad pepe eism ease e Re E eise PED cione eet vent Screw terminal wiring Main connector and piti Ut ice e Hcr ER OH ep p REA bi ani eG ae ewes Analog input terminals CHO IN CH7 IN sseseeseseeeeeeeenen ener enne nnne en rennen teint enne teet entes teen nre nennen Digital I O terminals Port AO to A7 and Port BO to B7 Power terminals nes neret th PESAS RE Eh Ground terminals Calibration terminal Trigger terminal Cou
22. ce 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 mcedaq com PDFmanuals SM UL Lab VIEW pdf USB 1208LS User s Guide this document is also available on our web site at www mecdag com PDFmanuals USB 1208LS pdf vi Chapter 1 Introducing the USB 1208LS This user s guide contains all of the information you need to connect the USB 1208LS to your computer and to the signals you want to measure The USB 1208LS is a USB 1 1 low speed device supported under popular Microsoft Windows operating systems It is designed for USB 1 1 ports and was tested for full compatibility with both USB 1 1 and USB 2 0 ports The USB 1208LS features eight analog inputs two 10 bit analog outputs 16 digital I O connections and one 32 bit external event counter The USB 1208LS is powered by the 5 volt USB supply from your computer No external power is required The USB 1208LS analog inputs are software configurable for either eight 11 bit single ended inputs or four 12 bit differential inputs An on board industry standard 82C55 programmable peripheral interface chip provides the 16 digital I O lines in two 8 bit ports You can configure each digital port independently for either input or output The USB 1208LS is shown in Figure 1 1 I O connections are made to the screw terminals located along each side
23. e reading Caution Shaded caution statements present information to help you avoid injuring yourself and others damaging your hardware or losing your data dit 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 amp 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 The following electronic documents provide helpful information relevant to the operation of the USB 1208LS MCC s Specifications USB 1208LS the PDF version of the Electrical Specification Chapter in this guide is available on our web site at www mccdaq com pdfs USB 1208LS pdf MCC s Quick Start Guide is available on our web site at www mccdaq com PDFmanuals DAQ Software Quick Start pdf MCC s Guide to Signal Connections is available on our web site at www mcecdag 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 Referen
24. for all channels cannot exceed 1 2 kS s You can acquire data from one channel at 1 2 kS s two channels at 600 S s and four channels at 300 S s You can start a continuous scan with either a software command or with an external hardware trigger event Burst scan mode In burst scan mode you can acquire data using the full capacity of the USB 1208LS 4 k sample FIFO You can initiate a single acquisition sequence of up to 4096 samples channels by either a software command or an external hardware trigger The captured data is then read from the FIFO and transferred to a user buffer in the host PC Burst scans are limited to the depth of the on board memory as the data is acquired at a rate faster than it can be transferred to the computer The maximum sampling rate is an aggregate rate The maximum rates that you can acquire data using burst scan mode is 8 kS s divided by the number of channels in the scan 3 1 USB 1208LS User s Guide Functional Details External components The USB 1208LS has the following external components as shown in Figure 3 1 USB connector LED Screw terminal banks 2 LED Screw terminal S Pins 1 to 20 Pins 21 to 40 JSB connector cable Figure 3 1 USB 1208LS external components USB connector The USB connector is on the right side of the USB 1208LS housing This connector provides 5V power and communication The voltage supplied through the USB connector is system dependent and m
25. nstallation of that software Please read this booklet completely before installing any software or hardware Unpacking the USB 1208LS As with any electronic device you should take care while handling to avoid damage from static electricity Before removing the USB 1208LS 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 2 1 USB 1208LS User s Guide Installing the USB 1208LS 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 DA Q Software Quick Start pdf Installing the hardware Be sure you are using the latest system software Before you connect the USB 1208LS make sure that you are using the latest versions of the USB drivers Before installing the USB 1208LS 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 U
26. nterderminal ue oes nU c MAE E JNCCUTACY s cec tessa cots t de Or e Eee eee ie e AEN en eise Ode E D eed T USB 1208LS channel gain queue feature esses enne ener eren Chapter 4 Specificato S TEE DRITTE 4 1 Analog OUtDUt 5 octies iet b etre am tti sedet 4 2 Digital input output ice Ba Ree te e eR DR RD a aetate 4 3 Externabttigget oo teneo min I Baie Bg E et hie teet T Rn 4 3 jeu M 4 3 Non volatile memo seed rue se Ress e iv c EE edet 4 3 lij EE 4 4 General ossicles EP ERI CREE HEC FEE GOAL der a 4 4 Environmental stein e Re ie e eie ee e ie i Re deiecit 4 4 iv USB 1208LS User s Guide Mechanical icc a Ea Reed ce e Re ae hie d Eee E M ain connector a nd pri Out 5 eno adno o Piet pee e emp eode uds 4 channel differential mode 8 channel single ended mode 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 1208LS 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 that can also help you get the most out of the USB 1208LS 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 ar
27. nvironment 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 if Measurement Computing Corporation has been no
28. rate faster than 1 sec sample may lead to timing inaccuracies EEREREEEEI Zoom Ot Figure 3 4 TracerDAQ plot of single ended measurement data Single ended measurements using differential channels To perform a single ended measurement using differential channels connect the signal to CHz IN HI input and ground the associated CHn IN LO input Differential configuration When all of the analog input channels are configured for differential input mode four analog channels are available In differential mode the input signal is measured with respect to the low input The input signal is delivered through three wires The wire carrying the signal to be measured connects to CHO IN HI CH1 IN 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 x2 5 V x2 0 V 1 25 V and 1 0 V 3 5 USB 1208LS 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 an
29. sbport 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 Availability of the Windows XP SP1 USB 1 1 and 2 0 update This article is available at support microsoft com kbid 822603 To connect the USB 1208LS 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 1208LS When you connect the USB 1208LS for the first time a Found New Hardware popup balloon Windows XP or dialog other Windows versions opens as the USB 1208LS is detected by your computer i JJ Found New Hardware no USB 1208LS USB 1208LS Another Found New Hardware balloon or dialog opens after the first closes that identifies the USB 1208LS as a USB Human Interface Device When this balloon or dialog closes the installation is complete The LED on the USB 1208LS should flash and then remain lit This indicates that communication is established between the USB 1208LS and your computer Caution Do not disconnect any device from the USB bus while the computer is communicating with the USB 1208LS or you may lose data and or your ability to communicate with the USB 1208LS
30. tified in advance of the possibility of such damages HM USB 1208LS doc ii 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 product for use in life support systems
31. ur USB 1208LS No third party device driver is required The USB 1208LS is plug and play There are no jumpers to position DIP switches to set or interrupts to configure You can connect the USB 1208LS 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 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 Chapter 2 Installing the USB 1208LS What comes with your USB 1208LS shipment As you unpack your USB 1208LS verify that the following components are included Hardware USB 1208LS 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 DA Q Software Quick Start pdf This booklet supplies a brief description of the software you received with your USB 1208LS and information regarding i
32. wered Hub 4 1 V min 5 25 V max Output current Note 7 Connected to Self Powered Hub 450 mA min 500 mA max Connected to Bus Powered Hub 50 mA min 100 mA max Note 5 This is the total current requirement for the USB 1208LS which includes up to 5mA for the status LED Note 6 Self powered refers to USB hubs and hosts with a power supply Bus powered refers to USB hubs and hosts without their own power supply Note 7 This refers to the total amount of current that can be sourced from the USB 5V analog outputs and digital outputs General Parameter Conditions Specification USB controller clock error 25 C 30 ppm max 0 to 70 C 50 ppm max Device type USB 1 1 low speed Device compatibility USB 1 1 USB 2 0 Environmental Operating temperature range 0 to 70 C Storage temperature range 40 to 70 C Humidity 0 to 90 non condensing Mechanical Dimensions 79 mm L x 82 mm W x 25 mm H USB cable length 3 Meters max User connection length 3 Meters max Main connector and pin out Connector type Screw terminal Wire gauge range 16 AWG to 30 AWG 4 4 USB 1208LS 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 GND 23 Port A2 4 CH1 IN H
33. y plots in Figure 3 11 are drawn for clarity and are not drawn to scale Input Voltage Output Code 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 Figure 3 12 shows the USB 1208LS transfer function with gain error Gain error is easily converted to voltage by multiplying the full scale FS input by the error USB 1208LS 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 2 or 20 mV Gain error 0 2 or 20 mV Actual x Output Code 2048 4095 FS Figure 3 12 ADC Transfer function with gain error For example the USB 1208LS 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 20 mV of the actual value Note that gain error is expressed as a ratio Values near FS are more affected from an absolute voltage standpoint than are values near mid scale which see little or no voltage error Combining these two error sources in Figure 3 13 we have a plot of the error band of the USB 1208LS for the 10 V range This is a graphical version of the typical accuracy specification of
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