PMD-1208FS User`s Guide
Contents
1. uL File Edit Run Help 81 x 100 9 y batter 6 0 El 6 0 o E E S aps Sime 2 0 0 0 1 1 l 1 1 1 1 1 1 1 2 55 38 2 55 41 2 55 43 2 55 45 2 55 47 2 55 49 ime Channel O Acquisition Rate secs sample 1 0 Set Rate Number of points displayed f10 10 seconds Using a rate faster than 1 sec sample may lead to timing inaccuracies Zoom Dff Figure 3 4 TracerDAQ plot of single ended measurement data 3 4 PMD 1208FS User s Guide Functional Details 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 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 1s available on differential channels to provide gains of up to 20 and a dynamic range of up to 12 bits Differential2. tea Sub cmdsropConvert Clicki TT 74 MEASUREMENT COMPUTING PMD 1208FS Personal Measurement Device brand USB based Analog and Digital I O Module User s Guide A Ai MEASUREMENT COMPUTING Document Revision 4 May 2005 Copyright 2005 Measurement Computing Corporation Your new Measurement Computing product comes with a fantastic extra Management committed to your satisfaction Refer to www mcecdaq 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 Life
3. CHx to GND 10 volts V max mode Input common mode voltage range for linear CHx to GND 10 V min 20 V max operation differential mode Absolute maximum input voltage input current Note 1 Number of channels Input ranges single ended mode 10 V G 2 G 1 O Input ranges differential mode 20 V 10 V 5 V 4 V 2 5 V G 8 2 0 V G 10 1 25 V G 16 1 0 V G 20 Software selectable 8 single ended 4 differential software selectable Throughput Note 2 Software paced 250 samples per second S s typ PC dependent 50 kilosamples per second kS s Channel gain queue Up to 16 Software configurable channel range elements and gain Resolution Note 3 CAL accuracy Integral linearity error __ least significant bit LSB typ Differential linearity error HOSLSByp Ec Source Repeatability LSB typ CAL current Source 5 milliamperes mA max 20 pA min 100 pA typ Trigger source Software External digital TRIG IN selectable 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 PMD 1208FS User s Guide Specifica
4. mastopConverct Visible 1 Parameters j Boards Che number used by CB CFG to describe tuis boara LowChan first A D channel of the scan o HidgncChan t last A D channel of the scan o CECOUNTE che total number of A D samples to collect C5BRate t spanple rate in samples per second Gaini Er FileMawnes the es Options Ate Jptions a CBCount FileName CBRates E LowChans HighChar r t ser S vuiae r t di P Lu lolShowHiChan Cap 1lBlShowOpnrions c ption lobilShowGain Cantion Forma lnlShowFiie Cantion FileNsmes lylShowlount Caprion Formats CBCounts 0 lb lShowPreTrig Caption Not Applicable Dummy DoEvents DS du ve 4 as vs wre ULSCAES S ET Bard gt If ULStr RE ARA UN l mns e E y mm cr m Low t USB based Personal Measurement Device brand module with 8 channels 12 bit input Sun ni nu collect tie values mich coP Lies Indeans Ul ULStats cbFfile amp InScan BboardNum Lowchen Highe Uhacart 502 ben uev a NULLE Gras MsgBox Ent r the nance nt the file you creared with ARESTAS IUS cds nnConverk Enab led D cnildtpconv rt Visibi 0 cradStartAcq Enab led chH5tatrtAcq Visible El txtFiIeNemwe SetFoch O a 4 ae C5 dio xiv Li Elseltt GEstats c AI AAS T lbiReadrPFiis IbiReadToral Csption lb lReadPreTrig Caption
5. PMD 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 2 3 Chapter 3 Functional Details Theory of operation analog input acquisition modes The PMD 1208FS 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 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 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 PMD 1208FS to the memory buffer on your computer The maximum continuous scan rate of 50 kS s 1s 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 externa
6. first time a series of Found New Hardware popup balloons Windows XP or dialogs other Windows versions opens as the PMD 1208FS is detected by your computer Found Hew Hardware Es USE Human Interface Device ij Found New Hardware x USB Human Interface Device Found New Hardware i Found New Hardware X Interface 0 Interface 0 It is normal for multiple dialogs to open when you connect the PMD 1208FS for the first time For additional information refer to the Notes on installing and using the PMD 1208FS that was shipped with the PMD 1208FS The last popup balloon or dialog states Your new hardware is installed and ready to use and the LED on the PMD 1208FS should flash and then remain lit This indicates that communication is established between the PMD 1208FS and your computer Found Mew Hardware Ix Y our new hardware Is installed and ready to use On most computers you can install up to two PMD 1208FS units If you need to connect more than two PMD 1208FS 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 PMD 1208FS or you may lose data and or your ability to communicate with the PMD 1208FS If the LED turns off If the LED is illuminated but then turns off the computer has lost communication with the
7. mode input voltage ranges are 20 V 10 V 5 V 4 V 2 5 V 42 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 3 5 4V Measured Signal CHHI gy 4V 8V Differential 8V 4V CHLO IAA 4 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 Measured Signal CHHI 11V a 8V Differential 8V CHLO 11V ANSA 7V Figure 3 6 Differential voltage example co
8. 00 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 PMD 1208FS USB 5 V as follows PMD 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 PMD 1208FS in a fully loaded configuration may be above that allowed by the computer In this case you must determine the per pin loading in the application to ensure that the maximum loading criteria is met The per pin loading is calculated by simply dividing the 5 V by the load impedance of the pin in question Calibration terminal The CAL connection pin 16 is an output you should use only to calibrate the PMD 1208FS Refer to the pinout diagrams on pages 3 3 and 3 3 for the location of this pin Calibration of the PMD 1208FS is software controlled via nstaCal Ground terminals The four analog ground AGND connections provide a common ground for all PMD 1208F
9. 2 PMD 1208F8 User s Guide Introducing the PMD 1208FS Connecting a PMD 1208FS to your computer is easy Installing a data acquisition device has never been easier The PMD 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 PMD 1208FS No third party device driver is required The PMD 1208FS is plug and play There are no jumpers to position DIP switches to set or interrupts to configure You can connect the PMD 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 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 PMD 1208FS What comes wi
10. 4 17 Power specifications Supply current Note o S A 5V USB power available Connected to self powered hub 4 5 V min 5 25 V max Note 10 Connected to externally powered root port hub Connected to bus powered hub 4 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 PMD 1208FS which includes up to 10 mA for the status LED PMD 1208F8 User s Guide Specifications Note 10 Self powered hub refers to a USB hub with an external power supply Self powered hubs allow a connected USB device to draw up to 500 mA Root port hubs reside in the PC s USB host controller The USB port s on your PC are root port hubs All externally powered root port hubs desktop PCs provide up to 500 mA of current for a USB device Battery powered root port hubs provide 100 mA or 500 mA depending upon the manufacturer A laptop PC that is not connected to an external power adapter is an example of a battery powered root port hub Bus powered hubs receive power from a 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 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 4 18
11. Computing Corporation does not authorize any Measurement Computing Corporation product for use in life support systems and or devices without the written approval of the CEO of 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 Users QUIde tum vi What you wall car from this user s SUA O osceciierd ngmd beet noren aa eepetesese tes pasci estem ve teal ve diet RE Pn ees vi Conventions IMS User S PUTAS se soot ia atu TOUROS ORAS vi Where toting more information eoo occiso elo oe gaba nba nin bo sed as noso ei vi Chapter 1 Introducing the PMD 1208FS iai r coeur a dci E E eua steunicau FO EUER caia cao EUER NR FOVE CAD 1 1 PIMID 1ZOSES DIOCK Gia Ora iii RR OR RR RR RR to ap RR RD REPOR DR OR RE Ria Emp Roatan 1 2 DOM Wale ECANUNCS conet tera cited ies ste dera Apolo bos Det RE pi dali UE ARE o SER LIE DD LS a ORGS EI dana UL bo E DEO 1 2 Connecting a PMD 1208FS to your computer 1S easy nennen nennen enne nennen enne 1 3 Chapter 2 Installing th PMD 1208F S sa sois casei
12. General specifications Device USB 20 ful speed Device compatibility E USB 1 1 USB 2 0 Environmental Table 4 19 Environmental specifications Operating Temperature range 0 to 70 C Storage temperature range 40 to 85 C 0 to 90 non condensing Mechanical Table 4 20 Mechanical specifications 79 millimeters mm long x 82 mm wide x 25 mm high USB cable length Main connector and pin out Table 4 21 Main connector specifications Wire gauge range 16 AWG to 30 AWG PMD 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 Port A3 5 CH3 IN 25 Port A4 6 AGND 26 Port A5 7 CH4 IN 27 Port A6 8 CH5 IN 28 Port A7 9 AGND 29 GND 10 CH6 IN 30 PC 5V 11 CH7 IN 31 GND 12 AGND 32 Port B
13. MD 1208FS User s Guide Functional Details The accuracy plots in Figure 3 13 are drawn for clarity and are not drawn to scale Input Voltage Ideal 9 77mV 20 mV F Ideal Ideal 9 77mV 20 mV a o Output Code 0 2048 4095 Ideal 9 77MV 20 mV gt gt Ideal gt FS Ideal 9 77mV 20 mV gt Figure 3 13 Error band plot PMD 1208FS channel gain queue feature The PMD 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 PMD 1208FS The channel list is made up of a channel number and range setting An example of a four element list 1s shown in Table 3 3 Table 3 3 Sample channel gain queue list emer Cm Rm 0 cno ew BIPSV BIPIOV BIPIV When a scan begins with the gain queue enabled the PMD 1208FS reads the first element sets the appropriate channel number and range and then acquires a sample The properties of the next element are then retrieved and another sample is acquired This sequence continues until all elements in the gain queue have been selected When the end of the channel list is detected the sequence returns to the first element in the list This sequence repeats until the specified number of samples
14. O 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 4 7 Ce Declaration of Conformity Manufacturer Measurement Computing Corporation Address 16 Commerce Boulevard Middleboro MA 02346 USA Category Electrical equipment for measurement control and laboratory use Measurement Computing Corporation declares under sole responsibility that the product PMD 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 1998 CISPR 11 Radiated and Conducted emissions Immunity EN61326 Annex A EN 61000 4 2 1995 Electrostatic Discharge immunity Criteria C EN 61000 4 3 1997 Radiated Electromagnetic Field immunity Criteria A EN 61000 4 8 1995 Power Frequency Magnetic Field immunity Criteria A Power line and I O tests to EN61000 4 4 EN61000 4 5 EN61000 4 6 and EN61000 4 11 were not required The device is DC powered from an I O cable which 1s less than three meters long Declaration of Conformity based on tests conducted by Chomerics Test Services Woburn MA 01801 USA in August 2004 Test records are outlined in Chomerics Test Report EMI3948 04 We hereby declare that the
15. OD O E Q U xe O E O xe c Q I o Oo E o c c o co 4 channel differential mode pin out 3 3 PMD 1208FS User s Guide Functional Details 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 diagrams on pages 3 3 and 3 3 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 AGND The input range for single ended mode is 10 V No other ranges are supported in single ended mode Figure 3 3 illustrates a typical single ended measurement connection Figure 3 3 Single ended measurement connection The following example shows the single ended measurement data acquired by TracerDAQ Data Acquisition TracerDAQ TracerDAQ
16. PMD 1208FS with a slave PMD 1208FS and acquire data follow the steps below 1 Connect the SYNC pin of the master PMD 1208FS to the SYNC pin of the slave PMD 1208FS 2 Run InstaCal 3 From the PC Board List on the InstaCal main form double click on the PMD 1208FS you want to use as a slave The Board Configuration dialog opens 4 Select Gated from the Ext Clock Type drop down list Ext Clock Type Gated hl Continuous 5 Set the Universal Library EXTCLOCK option with cbAInScan AInScan for the slave PMD 1208FS to enable pacing from the master PMD device This nstaCal 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 PMD 1208FS i PMD 1208FS cbAInScan AInScan for the slave PMD 1208FS Configure the Configure the SYNC pin SYNC pin for output for input Figure 3 14 Configuring for synchronous data acquisition When you are operating one PMD 1208FS do not set the EXTCLOCK option unless you are using an external clock for A D pacing Chapter 4 Specifications Typical for 25 C unless otherwise specified Specifications in italic text are guaranteed by design Analog input section Table 4 1 Analog input specifications A D converter type o Successive approximation type Input voltage range for linear operation single ended
17. S 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 pages 3 3 and 3 3 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 pages 3 3 and 3 3 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 PMD unit and acquire data from 16 channels Refer to the pinout diagrams on pages 3 3 and 3 3 for the location of this pin For more information refer to page 3 12 3 8 PMD 1208FS User s Guide Functional Details Counter terminal The CTR connection pin 20 is input to the 32 bit external event Refer to the pinout diagrams on pages 3 3 and 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 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 pr
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19. equipment specified conforms to the above Directives and Standards Ur Carl Haapaoja Vice President of Design Verification Measurement Computing Corporation 16 Commerce Boulevard Middleboro Massachusetts 02346 508 946 5100 Fax 508 946 9500 E mail info mccdag com Www mccdaq com
20. 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 PMD 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 PMD 1208FS User s Guide Functional Details Synchronizing multiple units You can connect the SYNC pin of two PMD 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 is sent to the screw terminal You can use this signal as a clock input to a second PMD by connecting it to the SYNC pin of the second PMD When used as a clock input the SYNC pin operates in one of two modes Continuous or Gated In the default Continuous mode a PMD 1208FS ignores the first clock pulse in order to ensure adequate setup time Use this mode 1f the unit 1s being paced from a continuous clock source such as a generator In the Gated mode it is assumed that the clock signal will be held off for an adequate amount of time for setup to occur No clock pulses are ignored Use this mode if the PMD 1208FS is set up as a slave and the source of the external clock is another PMD The SYNC pin pin 19 is set for pacer output by default To synchronize a master
21. l hardware trigger event External components The PMD 1208FS has the following external components as shown in Figure 3 1 USB connector LED Screw terminal banks 2 Screw terminal Pins 1 to 20 Screw terminal Pins 21 to 40 USB connector cable Figure 3 1 PMD 1208FS external components 3 1 PMD 1208FS User s Guide Functional Details USB connector The USB connector is on the right side of the PMD 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 PMD 1208FS It uses up to 5 mA of current and cannot be disabled Table 3 1 defines the function of the PMD 1208FS LED Table 3 1 LED Illumination LED Illumination Indication S Steady green The PMD 1208FS is connected to a computer or external USB hub Blinks continuously Data is being transferred Screw terminal wiring The PMD 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 3 2 Pin 20 Pin 1 6900006669090090090009 Personal Measurement Device E3255 PMD 1208FS 0060600999000099900999 uu E e e E o e Pin 40 Pin 24 Figure 3 2 PMD 1208FS Screw terminal pin nu
22. ll OUE sa quee Ceres Paese ies utet eu Lei ee ns Pts Pets u so ce cre eiae utc esci eL e LLL ipa 3 3 Analog input terminals CHO IN CH7 IN asas en toada SA RPA ASUS ASA oe eta epo bcd eMe to pue edet eroe bci eM et soa 3 4 Analog outpurterminals DA OU LO and DA OUT Daiane tete i tte ie eesti et operta eet rnt tret o 3 6 Digital I O terminals Port AO to A7 and Port BO to B7 sssssssssssssssssssseeeeeeee eene nnn naa 3 7 luis IEL AA Ripe eS P UT DT TEENS 3 7 Calibration terminal ssa sarada OR eq da Tt ee ed Nee gence rim rt Miti e ee 3 8 Ground Terminil S e M re Os nas 3 8 External Rio Ser termine comu onte so ad ita cesecaedtieo trae a Hi cR SS a a 3 8 SYNC all PR RAN a aa AD Pe ete deta gu a a E e H 3 8 Coutiterdermiindl tara a ra deindc M c M ca paia c M ca an ci E te 3 9 Pa 66 lino m MP T 3 9 PMDSIZOSES ch nnel eam queue feature 2er Eb tetti bns teas bs id 3 11 Synchronizing multiple UNS eoo m t neta onset M E eandcm Ese e de 3 12 Chapter 4 SDDS CIEL CALIONNS as ot ste bach acta Pe a oco on a cat q id att Due CER a Sat Di a dO a Sata A 4 1 Annalo c Input SCCHOE o Saio ia bes aa NL ceu e a ba ee Ls e pde a 4 aloe ODU SECHODB S oderit aeo betae E c iem ied qaad De ee utr 4 3 Dia DUE OBMEIDUE mass eterna en deb edens testet emite enc nen arnt tiec nt ctc mene seen eee ene ree ae 4 3 BExtettal t9 POL coss o RR ERR DR O RR O RGE tade RO RR
23. mbers Screw terminal pins 1 20 The screw terminals on the top edge of the PMD 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 connection GND One external event counter connection CTR 3 2 Functional Details 16 AWG to 30 AWG 16 digital I O connections PortAO to Port A7 and Port BO to Port B7 Screw terminal One power connection PC 5 V Three ground connections GND Screw terminal pins 21 40 The screw terminals on the bottom edge of the pins 21 to 40 provide the following connections Main connector and pin out Connector type Wire gauge range PMD 1208FS User s Guide NI OHO NI LHO NOV NICHO NI HO QNO9V NI vHO NI GHO QN9V NI 9HO NI ZHO QN9V 0 LNO W Q LNO VIA CNOV WO ANO NI DIAL ONAS YLoO IH NI OHO O71 NI OHO QNOV IH NI LHO O NI LHO QNOV IH NI cHO O NI CHO QNOV IH NI HO OL OT1NI HO LL NOV cl OLNOV A EL LAO V A vL QNO9V SL WO 9L QN9 ZL NI SIL BL ONAS 61 YLO Oc O 00 l CO LO st CO CN x oooooooooooooooooooQ oooooooooooooooooooQo O 00 l KO LO st CO CN ooooo0o0o0o0o000o0o0000O0Oo000 ODOOOWODOOODGWODGDGOOD
24. mmon mode voltage of 11 V 3 5 PMD 1208FS User s Guide Functional Details 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 11 V Voltages between 10 V and 3 V are resolved but those below 10 V are clipped see Figure 3 7 3V A Measured Signal CHHl 7y v 11V 8V Differential 7V 3V Y CHLO 7V AA Y 11V Figure 3 7 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 the input range criteria Table 3 2 shows some possible inputs and the expected results Table 3 2 Sample inputs and differential results In Valid 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 connecti
25. n 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 PMD 1208FS Refer to the pinout diagrams on pages 3 3 and 3 3 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 PMD 1208FS and possibly the computer The maximum total output current that can be drawn from all PMD 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 3 7 PMD 1208FS User s Guide Functional Details Just connecting the PMD 1208FS to your computer draws 80 mA of current from the USB 5 V supply Once you start running applications with the PMD 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 PMD 1208FS is the difference between the total current requirement of the PMD based on the application and the allowed current draw of the PC platform 5
26. n notified in advance of the possibility of such damages HM PMD 1208FS doc li Trademark and Copyright Information Personal Measurement Device brand TracerDAQ Universal Library InstaCal Harsh Environment Warranty Measurement Computing Corporation and the Measurement Computing logo are either trademarks or registered trademarks of Measurement Computing Corporation SoftWIRE and the SoftWIRE logo are registered trademarks of SoftWIRE Technology Inc PC is a trademark of International Business Machines Corp Microsoft Windows and Visual Studio are either trademarks or registered trademarks of Microsoft Corporation LabVIEW is a trademark of National Instruments 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
27. oduct While 12 bits or 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 PMD 1208FS are offset and gain Nonlinearity is small in the PMD 1208FS and is not significant as an error source with respect to offset and gain Figure 3 10 shows an ideal error free PMD 1208FS transfer function The typical calibrated accuracy of the PMD 1208FS 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 Input Voltage Output Code D 2048 4095 FS Figure 3 10 Ideal ADC transfer function The PMD 1208FS offset error is measured at mid scale Ideally a zero volt input should produce an output code of 2048 Any deviation from this 1s an offset error Figure 3 11 shows the PMD 1208FS transfer function with an offset error The typical offset error specification on the 10 V range is 9 77 mV Offset error affects all codes equally by shifting the entire transfer function up or down along the input voltage axis 3 9 PMD 1208FS User s Guide Functional Details The accuracy plot
28. ons to the screw terminal pins 13 and 14 D A OUT 0 and D A OUT 1 Refer to the pinout diagrams on pages 3 3 and 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 3 6 PMD 1208FS User s Guide Functional Details 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 B0 to Port B7 Refer to the pinout diagrams on pages 3 3 and 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 1s set to the 5 V input Port AO reads TRUE 1 If you move the switch to GND Port AO reads FALSE T ia V M B e Mura LN ao E In 4 4 Pin 21 PORT AO Figure 3 8 Digital connection Port AO detecting the state of a switch LT GND 5V Figure 3 9 Schematic showing switch detection by digital channel Port AO For more information on digital signal connections For more information o
29. or output in two 8 bit ports A 32 bit counter can count TTL pulses A SYNC synchronization input output line allows you to pace the analog input acquisition of one PMD module from the clock output of another The PMD 1208FS is shown in Figure 1 1 I O connections are made to the screw terminals located along each side of the PMD 1208FS Figure 1 1 PMD 1208FS 1 1 PMD 1208F8 User s Guide Introducing the PMD 1208FS PMD 1208FS block diagram PMD 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 Q 8 single ended g 16 11 bit channels ct 7 Port A Or D l 3 S 4 differential s DIO 12 bit channels e 7 O 3 Port B 9 S Analog output 3 D O USB 2 channels O 9 SYNC Microcontroller 12 bit D TRIG IN 2 O CAL CAL 32 bit Event Counter 1 channel Figure 1 2 PMD 1208FS functional block diagram Software features The following software ships with the PMD 1208FS free of charge ns aCal installation calibration and test utility TracerDAQ suite of virtual instruments SoftWIREQ for Visual Studio NET graphical programming MCC DAQ Components for VS NET installed with SoftWIRE for VS NET For information on the features of nstaCal TracerDAQ and SoftWIRE refer to the DAQ Software Quick Start booklet that shipped with the PMD 1208FS 1
30. ormation 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 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 procedure is explained in the DAQ Software Quick Start Never touch the exposed pins or circuit connections on the board Where to find more information The following electronic documents provide information that can help you get the most out of your Personal Measurement Device brand PMD 1208FS MCC s Specifications PMD 1208FS the PDF version of Chapter 4 in this guide is available on our web site at www mccdaq com pdfs PMD 1208FS pdf MCC s DAQ Software Quick Start 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 http www mccdaq com PDFmanuals sm ul user guide pdf MCC s Universal Library Function Reference is available on ou
31. ote 6 External Digital TRIG IN Trigger mode Software selectable Edge sensitive user configurable for CMOS compatible rising or falling edge Trigger teny osma rigger pulse width O iesma Umwthghvoug A0 V min 55 Vabsotute max Finputtow vottage 10V mas 05 V absolute min input leakage ewrent O ASS Note 6 TRIG IN is a Schmitt trigger input protected with a 1 5 kilohm kQ series resistor External clock input output Table 4 13 External clock I O specifications nmm ss agp Biden Software selectable direction ae mptdokme Sd s0KHammim Clock pulse width PRN Input high voltage D 4 0 V min 5 5 V absolute max Output high voltage Note 7 E A O Output low voltage Note 7 0 6 V max Note 7 SYNC is a Schmitt trigger input and is over current protected with a 200 Q series resistor 4 4 PMD 1208FS User s Guide Specifications Counter section Table 4 14 Counter specifications Pin name Note 8 Number of channel Resolution High pulse idi Low pulse width Note 8 CTR is a Schmitt trigger input protected with a 1 5 K Q series resistor Non volatile memory Table 4 15 Non volatile memory specifications EEPROM 1 024 bytes Microcontroller Table 4 16 Microcontroller specifications High performance amp bit RISC microcontroller Program Memory 16 384 words 2048 bytes Power Table
32. r web site at http 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 mcecdaq com PDFmanuals SM UL LabVIEW pdf PMD 1208FS User s Guide this document is available on our web site at www mccdaq com PDFmanuals PMD 1208FS pdf vi Chapter 1 Introducing the PMD 1208FS This user s guide contains all of the information you need to connect the PMD 1208FS to your computer and to the signals you want to measure The PMD 1208FS is part of the Personal Measurement Device brand of USB based data acquisition products The PMD 1208FS is a USB 2 0 full speed device supported under Microsoft Windows 98 2na edition Windows ME Windows 2000 and Window XP It is designed for USB 1 1 ports and was tested for full compatibility 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 PMD 1208FS to make sure you are using the latest USB drivers The PMD 1208FS features eight analog inputs two 12 bit analog outputs 16 digital I O connections and one 32 bit external event counter The PMD 1208FS is powered by the 5 volt USB supply from your computer No external power is required The PMD 1208FS 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
33. s 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 PMD 1208FS transfer function with gain error Gain error is easily converted to voltage by multiplying the full scale FS input by the error The accuracy plots in Figure 3 12 are drawn for clarity and are not drawn to scale Input Voltage ain error 0 2 or 20 mV Ideals E 24 Gain error 0 2 or 20 mV Ld EA Ld 5 Actual Output Code Di 2048 4095 FS Figure 3 12 ADC Transfer function with gain error For example the PMD 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 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 PMD 1208FS for the 10 V range This is a graphical version of the typical accuracy specification of the product 3 10 P
34. th your PMD 1208FS shipment As you unpack your PMD 1208FS verify that the following components are included Hardware PMD 1208FS USB cable 2 meter length Software The Measurement Computing Data Acquisition Software CD contains the following software ns aCal installation calibration and test utility TracerDAQ suite of virtual instruments SOftWIRE for VS NET Ze 7 SoftWIRE MCC DAQ Components for NET E includes La SoftWIRE and more 2 1 PMD 1208F8 User s Guide Installing the PMD 1208FS Documentation In addition to this hardware user s guide you should also receive the DAQ Software Quick Start available in PDF at www mccdaq com PDFmanuals DAQ Software Quick Start pdf Please read this booklet completely before installing any software and hardware DAQ Software Quick Start Unpacking the PMD 1208FS As with any electronic device you should take care while handling to avoid damage from static electricity Before removing the PMD 1208FS from its packaging ground yourself using a wrist strap or by simply touching the computer chassis or other grounded object to eliminate any stored static charge If any components are missing or damaged notify Measurement Computing Corporation immediately by phone fax or e mail Phone 508 946 5100 and follow the instructions for reaching Tech Support Fax 508 946 9500 to the attention of Tech Support Email techs
35. time 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 if Measurement Computing Corporation has bee
36. tions Note 3 The AD7870 converter only returns 11 bits 0 2047 codes in single ended mode Table 4 2 Accuracy differential mode Accuracy LSB Table 4 3 Accuracy single ended mode Accuracy LSB Table 4 4 Accuracy components differential mode All values are Range Y of Reading Gain Error at full scale FS Offset mV Accuracy at FS mV millivolts mV 20 V 2 V 9 766 49 766 9 766 29 766 9 766 14 766 0 0 0 i 0 l i 0 uasv 02 s p 12266 o2 4 a 02 Od 02 10 9 1976 O20 02 18 02 0 Aa 249 2 2 22 z 2 2 2 2 a oo 2 E 1 766 Table 4 5 Accuracy components single ended mode All values are of Reading Gain Error at FS mV Offset mV Accuracy at FS mV 19 531 39 531 Table 4 6 Noise performance differential mode 030 Typical Counts 4 2 PMD 1208F8 User s Guide Specifications Analog output section Table 4 8 Analog output specifications Parameter Specification Resolution E bis i in 4096 Owpuramge o 4086F 1 mV per LSB Numberofchannels 2 Software paced Throughput Note 4 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 Initializes to 000h code voltage Each DIA OUT IS mA Sewme OR s ty Note 4 Maximum throughput scanning
37. 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 4 9 Analog output accuracy all values are x Accuracy LSB 0 4 096 V 4 0 typ 45 0 max Table 4 10 Analog output accuracy components all values are Range of FSR Gain Error at FS mV Offset mV Accuracy at FS mV Note 5 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 4 11 Digital I O specifications Digital type CMOS Number of I O 16 Port AO through A7 Port BO through B7 2 banks of Pull up pull down All pins pulled up to Vs via 47 K resistors default Positions available for pull configuration 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 3 8 V min IOH 2 5 mA Output low voltage 0 7 V max IOL 2 5 mA Power on and reset state PMD 1208FS User s Guide Specifications External trigger Table 4 12 Digital trigger specifications Parameter Specification Trigger source N
38. tod adn ER DRT mast odd scien 4 4 External clock input OUIDULs ocean idee eot E LAS ana Ri rette dte A E sa M Id oeste tu eub det otf 4 4 COUME SECON s cased teo ore ues atitem RD R RR ent RD NA NR RD tUm dumis 4 5 PMD 1208FS User s Guide Novo Hl THO MO ARE ere ne a ey ee ee il ac E ee ae ee ee eee eee 4 5 MELO CONES acirrada 4 5 PONO a it 4 5 General octaua E E c MED du M a uA EA d Od 4 6 Environment be rotae bao ote aw aa santas otim tt Ae Dd eder E 4 6 re PEINT EE 4 6 Mamiconhectorand Pin Ofrann tas coude tatucno n qtiae E A bie cete 4 6 2 channel ditrerentia MOOG scs oisi dre vote te upset eu A A OE utro Deoa SR tr tines iR a 4 7 S channel smolesended mode sua ad Rat saia etat de GS Lindo a E dl Do E RS Da Me Du 4 7 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 PMD 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 that can also help you get the most out of the PMD 1208FS 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 inf
39. upport measurementcomputing com Installing the software Refer to the DAQ Software Quick Start for instructions on installing the software on the Measurement Computing Data Acquisition Software CD This booklet is available in PDF at www mccedaq com PDFmanuals DAQ Software Quick Start pdf Installing the hardware Be sure you are using the latest system software Before you connect the PMD 1208FS make sure that you are using the latest versions of the USB drivers Before installing the PMD 1208FS 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 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 PMD 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 1s connected to your computer The USB cable provides power and communication to the PMD 1208FS 2 2 PMD 1208F8 User s Guide Installing the PMD 1208FS When you connect the PMD 1208FS for the
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