Omega OM-USB-1208FS Webcam User Manual
Contents
1. 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 1V 24 1 Table 3 Accuracy single ended mode Range Accuracy LSB 10 V 4 0 Table 4 Accuracy components differential mode All values are Range of Reading Gain Error at full scale FS Offset mV Accuracy at FS mV millivolts mV 20 V 0 2 40 9 766 49 766 10 V 0 2 20 9 766 29 766 5 V 0 2 10 9 766 19 766 4 V 0 2 8 9 766 17 766 2 5 V 0 2 5 9 766 14 766 2 V 0 2 4 9 766 13 766 1 25 V 0 2 2 5 9 766 12 266 1 V 0 2 2 9 766 11 766 Table 5 Accuracy components single ended mode All values are Range of Reading Gain Error at FS mV Offset mV Accuracy at FS mV 10 V 0 2 20 19 531 39 531 Table 6 Noise performance differential mode Range Typical counts Least significant bit oot mean square LSBrms 20 V 2 0 30 10 V 2 0 30 5 V 3 0 45 4 V 3 0 45 2 5 V 4 0 61 2 V 5 0 76 1 25 V 7 1 06 1 V 8 1 21 23 OM USB 1208FS User s Guide Specifications Table 7 Noise performance single ended mode LSBrms 0 30 Range Typical Counts 10 V 2 Analog output Table 8 Analog output specifications Parameter Conditions Specification 12 bits 1 in 4096 0 4 096 V 1 mV per LSB Resolution Output range Number of channels 2 Throughput2. fran CE Shop online at omega com CEOMEGA omega com e mail info omega com For latest product manuals omegamanual info ISQ9001 1503001 STAMFORD CT MANCHESTER UK OM USB 1208FS 12 Bit Multifunction USB Data Acquisition Module omega com ZEOMEGA OMEG Anet Online Service Internet e mail omega com info omega com U S A ISO 9001 Certified Canada Servicing North America Omega Engineering Inc One Omega Drive P O Box 4047 Stamford CT 06907 0047 USA Toll Free 1 800 826 6242 TEL 203 359 1660 FAX 203 359 7700 e mail info omega com 976 Bergar Laval Quebec H7L 5A1 Canada Toll Free 1 800 826 6342 TEL 514 856 6928 FAX 514 856 6886 e mail info omega ca For immediate technical or application assistance U S A and Canada Mexico Latin America Benelux Czech Republic France Germany Austria United Kingdom ISO 9001 Certified Sales Service 1 800 826 6342 1 800 TC OMEGA Customer Service 1 800 622 2378 1 800 622 BEST Engineering Service 1 800 872 9436 1 800 USA WHEN En Espa ol 001 203 359 7803 BAX 001 203 359 7807 info omega com mx e mail espanol omega com Servicing Europe Managed by the United Kingdom Office Toll Free 0800 099 3344 TEL 31 20 347 21 21 BAX 31 20 643 46 43 e mail sales amp omegaeng nl Frystatska 184 733 01 Karvin Czech Republic Toll Free 0800 1 66342 TEL 42
3. Five analog ground connections AGND One ground connection GND One external event counter connection CTR OM USB 1208FS User s Guide Functional Details Screw terminal pins 21 40 The screw terminals on the bottom edge of the pins 21 to 40 provide the following connections Main connector and pin out 16 digital I O connections PortAO to Port A7 and Port BO to Port B7 One power connection PC 5 V Three ground connections GND Connector type Screw terminal Wire gauge range 16 AWG to 30 AWG Analog input terminals CHO IN CH7 IN o z 55 ot 0000220224022 022 rzooa z ZrnoZntZnnZro ETYZXoxxorrorrorrorr OHDFOOLOADLOOLOOLOOLOO Q O 0 r XQ i0 st OO QN O ETET Or WW dO cC oooooooooooooooooooQ DWDOWWDOWWOWOWDOWOWDOWOWOOO ooo be TOMMY 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 GND Port B7 Port B6 Port B5 Port B4 Port B3 Port B2 Port B1 Port BO GND PC 5V GND Port A7 Port A6 Port A5 Port A4 Port A3 Port A2 Port A1 Port AO 8 channel single ended mode pin out cr Oo ce Sz Sz 2z Sz o a22022022022022 rzoa z ZoozZzmamwmz zoo E TrYZXxoXXorrorrorrorzr CHF OOLOOLOOLOOLOOLOO OOO XQ uu t OO QN eG TET Mornontrone 99999999990090990000900 oooooooooooooooooooo 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 MA QD iD t QN Oo 2 P DW dN v G mmmn PILILLA O
4. G 16 1 0 V G 20 Software selectable Throughput Note 2 Software paced 250 samples per second S s typ PC dependent Continuous scan 50 kilosamples per second kS s Channel gain queue Up to 16 elements Software configurable channel range and gain Resolution Note 3 Differential 12 bits no missing codes Single ended 11 bits CAL accuracy CAL 2 5 V 36 25 mV max Integral linearity error least significant bit LSB typ Differential linearity error 0 5 LSB typ Repeatability 1 LSB typ CAL current Source 5 milliamperes mA max Sink 20 HA min 100 uA typ Trigger source Software selectable External digital TRIG IN Pacer source Software selectable Internal External SYNC rising edge triggered Programmed IO 22 OM USB 1208FS User s Guide Specifications 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 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 Note 3 The AD7870 converter only returns 11 bits 0 2047 codes in single ended mode Table 2 Accuracy differential mode
5. Program Memory 16 384 words Data Memory 2 048 bytes Power Table 17 Power specifications Parameter Conditions Specification Supply current Note 9 80 mA 5V USB power available Note 10 Connected to self powered hub 4 5 V min 5 25 V max Connected to externally powered root port hub Connected to bus powered hub 4 1 V min 5 25 V max Output current Note 11 Connected to self powered hub 420 mA max Connected to externally powered root port hub Connected to bus powered hub 20 mA max Note 9 This is the total current requirement for the OM USB 1208FS which includes up to 10 mA for the status LED 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 di
6. Chapter 1 Introducing the OM USB 1208FS This user s guide contains all of the information you need to connect the OM USB 1208FS to your computer and to the signals you want to measure The OM USB 1208FS is a USB 2 0 full speed device supported under popular Microsoft Windows operating systems It is designed for USB 1 1 ports and was tested for full compatibility with both USB 1 1 and USB 2 0 ports The OM USB 1208FS features eight analog inputs two 12 bit analog outputs 16 digital I O connections and one 32 bit external event counter The OM USB 1208FS is powered by the 5 volt USB supply from your computer No external power is required The analog inputs are software configurable for either eight 11 bit single ended inputs or four 12 bit differential inputs Sixteen digital I O lines are independently selectable as input or output in two 8 bit ports A 32 bit counter can count TTL pulses The counter increments when the TTL levels transition from low to high rising edge A SYNC synchronization input output line lets you pace the analog input acquisition of one USB module from the clock output of another The OM USB 1208FS is shown in Figure 1 I O connections are made to the screw terminals located along each side of the OM USB 1208FS Figure 1 OM USB 1208FS OM USB 1208FS User s Guide Introducing the OM USB 1208FS OM USB 1208FS block diagram OM USB 1208FS functions are illustrated in the block diagram
7. Chapter 1 Introducing the OM USB 1208FS eee enrere enrere ennenen ennenen een 6 OM USB 1208ES block diagrdmi ets ent pero oe Eg Rt RT re EE 7 Software features x oe tere e e e iet e eR ce tee ls e ERU edt eee e ees 7 Connecting a OM USB 1208FS to your computer is easy sese eee eee eee 8 Chapter 2 Installing the OM USB 1208FS vesse sees esser ereer enrere neee nreo ennenen ennenen 9 What comes with your OM USB 1208FS shipment eese eren ener ener eene nein 9 Hardware ive enne tun MC dee T imet I oL EU ae hts vated E eod eme 9 Additional documentation iones EHUPPRUUERUIUIG UID URUIRGSUDERUR RERO HECIBEHERHORROUERUIEER 9 Unpacking the OM USB 1208FS 0 0 0 cssessssesenercnsecosesensesssevevencnensesenesonsnsuvesssenonesedsesssenesssssstnesenenoesosenensees 9 Installing the Software eminere RO Ot te EDU Fate ED Rp E 10 Installing the Te eme ee ERE RE RU E gd RUE eee PU ee RUE 10 Chapter 3 Functional Details 11 Theory of operation analog input acquisition modes sss esse eee ee eee 11 Software paced mode 5 3 RR ee Pert i RR e bei i P RRR E Continuous scan mode External componens ras neo orte re ne he ti oe eee RR ERE S e ge REZEN ee aee vo thea Vows IVERSEN SE IS avene M i j 6 EA D MERI Screw terminal wiring Main connector and
8. Heaters tA Flexible Heaters Eg Laboratory Heaters ENVIRONMENTAL MONITORING AND CONTROL EF Moterin g amp Control Instrumentation UA Refractometers if Pumps amp Tubing as M4902 0510
9. Note 4 Software paced 250 S s single channel typical PC dependent Single channel continuous scan 10 kS s Dual channel continuous scan simultaneous update 5 kS s Power on and reset voltage Initializes to 000h code Output drive Each D A OUT 15 mA Slew rate 0 8V microsecond us typ Note 4 Maximum throughput scanning to PC memory is machine dependent The rates specified are for Windows XP only Maximum rates on operating systems that predate XP may be less and must be determined through testing on your machine Table 9 Analog output accuracy all values are Range Accuracy LSB 0 4 096 V 4 0 typ 45 0 max Table 10 Analog output accuracy components all values are Range 96 of FSR Gain Error at FS mV Offset mV Accuracy at FS Note 5 mV 0 4 096 V 0 1 typ 0 9 max 4 0 typ 36 0 max 1 0 typ 9 0 max 4 0 typ 45 0 max Note 5 Negative offsets will result in a fixed zero scale error or dead band At the maximum offset of 9 mV any input code of less than 0x009 will not produce a response in the output Digital input output Table 11 Digital I O specifications Digital type CMOS Number of I O 16 Port A0 through A7 Port BO through B7 Configuration 2 banks of 8 Pull up pull down configuration AII pins pulled up to Vs via 47K resistors default Positions available for pull down to ground Hardware selectable via ze
10. on all ranges For the 10 V range this would yield 10 V x 40 002 20 mV This means that at full scale neglecting the effect of offset for the moment the measurement would be within 20 mV of the actual value Note that gain error is expressed as a ratio Values near FS are more affected from an absolute voltage standpoint than are values near mid scale which see little or no voltage error Combining these two error sources in Figure 12 we have a plot of the error band of the OM USB 1208FS for the 10 V range This is a graphical version of the typical accuracy specification of the product 19 OM USB 1208FS User s Guide Functional Details The accuracy plots in Figure 12 are drawn for clarity and are not drawn to scale Input Voltage deal 9 77 mV 20 mV lt lIdeal Ideal 9 77 mV 20 mV Output Code Ideal 9 77 mV 20 mV gt Ideal gt FS Ideal 9 77 mV 20 mV gt Figure 12 Error band plot OM USB 1208FS channel gain queue feature The OM USB 1208FS s channel gain queue feature allows you to set up a scan sequence with a unique per channel gain setting and channel sequence The channel gain queue feature removes the restriction of using an ascending channel sequence at a fixed gain This feature creates a channel list which is written to local memory on the OM USB 1208FS The channel list is made up of a channel number and range setting An example of a four element list is sho
11. 0 59 6311899 FAX 420 59 6311114 e mail info omegashop cz Managed by the United Kingdom Office Toll Free 0800 466 342 TEL 33 0 161 37 29 00 FAX 433 0 130 57 54 27 e mail sales omega fr Daimlerstrasse 26 D 75392 Deckenpfronn Germany Toll Free 0800 6397678 TEL 49 0 7056 9398 0 FAX 49 0 7056 9398 29 e mail info omega de OMEGA Engineering Ltd One Omega Drive River Bend Technology Centre Northbank Irlam Manchester M44 5BD United Kingdom Toll Free 0800 488 488 TEL 44 0 161 777 6611 FAX 444 0 161 777 6622 e mail sales omega co uk It is the policy of OMEGA Engineering Inc to comply with all worldwide safety and EMC EMI regulations that apply OMEGA is constantly pursuing certification of its products to the European New Approach Directives OMEGA will add the CE mark to every appropriate device upon certification The information contained in this document is believed to be correct but OMEGA accepts no liability for any errors it contains and reserves the right to alter specifications without notice WARNING These products are not designed for use in and should not be used for human applications Table of Contents Preface About this User s Guide css ee sees eee reeeo 5 What you will learn from this user s guide ene eene nrenetnr ene tnnn nennen trennt 5 Conventions in tliis user Ts soie EROR Te ERU OR EUR RE elteti 5 Where to find more information 5 adn teo t paire d n etat e err rel 3
12. 8 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 OM USB 1208FS so that you get the most out of its USB data acquisition features This user s guide also refers you to related documents available on our web site and to technical support resources Conventions in this user s guide For more information on Text presented in a box signifies additional information and helpful hints related to the subject matter you are reading Caution Shaded caution statements present information to help you avoid injuring yourself and others damaging your hardware or losing your data dii 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 Never touch the exposed pins or circuit connections on the board Where to find more information For additional information relevant to the operation of your hardware refer to the Documents subdirectory where you installed the software or search for your device on our website at www omega com
13. ANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion or current heat moisture or vibration improper specification misapplication misuse or other operating conditions outside of OMEGA s control Components in which wear is not warranted include but are not limited to contact points fuses and triacs OMEGA is pleased to offer suggestions on the use of its various products However OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA either verbal or written OMEGA warrants only that the parts manufactured by the company will be as specified and free of defects OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER EXPRESSED OR IMPLIED EXCEPT THAT OF TITLE AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED LIMITATION OF LIABILITY The remedies of purchaser set forth herein are exclusive and the total liability of OMEGA with respect to this order whether based on contract warranty negligence indemnification strict liability or otherwise shall not exceed the purchase price of the component upon which liability is based In no event shall OMEGA be liable for consequential incidental or special damages CONDITIONS
14. COST was PURCHASED of the repair 2 Model and serial number of the product under 2 Model and serial number of the product and warranty and 3 Repair instructions and or specific problems 3 Repair instructions and or specific problems relative to the product relative to the product OMEGA ss policy is to make running changes not model changes whenever an improvement is possible This affords our customers the latest in technology and engineering OMEGA is a registered trademark of OMEGA ENGINEERING INC Copyright 2010 OMEGA ENGINEERING INC All rights reserved This document may not be copied photocopied reproduced translated or reduced to any electronic medium or machine readable form in whole or in part without the prior written consent of OMEGA ENGINEERING INC Where Do I Find Everything Need for Process Measurement and Control OMEGA Of Course Shop online at omega com TEMPERATURE PRESSURE STRAIN AND FORCE iF Transducers amp Strain Gages ef Load Cells amp Pressure Gages if Displacement Transducers FLOW LEVEL ibe Rotameters Gas Mass Flowmeters amp Flow Computers Air Velocity Indicators wef Totalizers amp Batch Controllers pH CONDUCTIVITY DATA ACQUISITION Pf Data Acquisition amp Engineering Software ef Communications Based Acquisition Systems wF Plug in Cards for Apple IBM amp Compatibles HEATERS tY Heating Cable UA Cartridge amp Strip Heaters LY Immersion amp Band
15. Equipment sold by OMEGA is not intended to be used nor shall it be used 1 as a Basic Component under 10 CFR 21 NRC used in or with any nuclear installation or activity or 2 in medical applications or used on humans Should any Product s be used in or with any nuclear installation or activity medical application used on humans or misused in any way OMEGA assumes no responsibility as set forth in our basic WARRANTY DISCLAIMER language and additionally purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product s in such a manner RETURN REQUESTS INQUIRIES Direct all warranty and repair requests inquiries to the OMEGA Customer Service Department BEFORE RETURNING ANY PRODUCT S TO OMEGA PURCHASER MUST OBTAIN AN AUTHORIZED RETURN AR NUMBER FROM OMEGA S CUSTOMER SERVICE DEPARTMENT IN ORDER TO AVOID PROCESSING DELAYS The assigned AR number should then be marked on the outside of the return package and on any correspondence The purchaser is responsible for shipping charges freight insurance and proper packaging to prevent breakage in transit FOR WARRANTY RETURNS please have the FOR NON WARRANTY REPAIRS consult OMEGA following information available BEFORE for current repair charges Have the following contacting OMEGA information available BEFORE contacting OMEGA 1 Purchase Order number under which the product 1 Purchase Order number to cover the
16. cctctttctcO Occccccct ZOOOO000600Z2O0Z2006000000 Oaaaacaoaaocaoaoaaaaaaaa 4 channel differential mode pin out You can connect up to eight analog input connections to the screw terminal containing pins 1 to 20 CHO IN through CH7 IN Refer to the pinout diagrams above for the location of these pins You can configure the analog input channels as eight single ended channels or four differential channels When configured for differential mode each analog input has 12 bit resolution When configured for single ended mode each analog input has 11 bit resolution due to restrictions imposed by the A D converter Single ended configuration When all of the analog input channels are configured for single ended input mode eight analog channels are available The input signal is referenced to signal ground GND and delivered through two wires The wire carrying the signal to be measured connects to CHn 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 13 OM USB 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 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
17. 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 CH 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 2 5 V 2 0 V 1 25 V and 1 0 V In differential mode the following two requirements must be met for linear operation Any analog input must remain in the 10V to 20V range with respect to ground at all times The maximum differential voltage on any given analog input pair must remain within the selected voltage range The input common mode voltage signal of the differential channel must be in the 10 V to 20 V range in order to yield a useful result For example you input a 4 V pp sine 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 5 4V Measured S
18. es of Found New Hardware popup balloons Windows XP or dialogs other Windows versions opens as the OM USB 1208FS is detected by your computer This is normal The last popup balloon or dialog states Your new hardware is installed and ready to use and the LED on the OM USB 1208FS should flash and then remain lit This indicates that communication is established between the OM USB 1208FS and your computer You can install up to two OM USB 1208FS units on most computers If you need to connect more than two OM USB 1208FS units to your computer contact Tech Support by phone fax or e mail Phone 203 359 1660 Fax 203 359 7700 Email das omega com Caution Do not disconnect any device from the USB bus while the computer is communicating with the OM USB 1208FS or you may lose data and or your ability to communicate with the OM USB 1208FS If the LED turns off If the LED is illuminated but then turns off the computer has lost communication with the OM USB 1208FS To restore communication disconnect the USB cable from the computer and then reconnect it This should restore communication and the LED should turn back on 10 Chapter 3 Functional Details Theory of operation analog input acquisition modes The OM USB 1208FS can acquire analog input data in two different modes software paced and continuous scan Maximum throughput is system dependent Maximum throughput may be lower in Windows operatin
19. g systems that predate Windows XP Software paced mode In software paced mode you can acquire one analog sample at a time You initiate the A D conversion by calling a software command The analog value is converted to digital and returned to the computer You can repeat this procedure until you have the total number of samples that you want from one channel The maximum throughput sample rate in software paced mode is system dependent Continuous scan mode In continuous scan mode you can acquire data from up to eight channels The analog data is continuously acquired and converted to digital values until you stop the scan Data is transferred in blocks of 31 samples from the OM USB 1208FS to the memory buffer on your computer The maximum continuous scan rate of 50 kS s is an aggregate rate The total acquisition rate for all channels cannot exceed 50 kS s You can acquire data from one channel at 50 kS s two channels at 25 kS s and four channels at 12 5 kS s You can start a continuous scan with either a software command or with an external hardware trigger event External components The OM USB 1208FS has the following external components as shown in Figure 3 USB connector LED Screw terminal banks 2 Screw terminal Pins 1 to 20 Screw terminal Pins 21 to 40 USB connector cable Figure 3 OM USB 1208FS external components 11 OM USB 1208FS User s Guide Functional Details USB connecto
20. g to avoid damage from static electricity Before removing the OM USB 1208FS from its packaging ground yourself using a wrist strap or by simply touching the computer chassis or other grounded object to eliminate any stored static charge If any components are missing or damaged notify Omega Engineering immediately by phone fax or e mail Phone 203 359 1660 Fax 203 359 7700 Email das omega com OM USB 1208FS User s Guide Installing the OM USB 1208FS Installing the software Refer to the OMB DAQ 2416 Series and OM USB Series Data Acquisition Software User s Guide for instructions on installing the software on the OMB DAQ 2416 Series and OM USB Series Data Acquisition Software CD This booklet is available in PDF at http www omega com manuals manualpdf M4803 pdf We recommend that you download the latest Windows Update onto your computer before installing and operating the OM USB 1208FS Installing the hardware Be sure you are using the latest system software Before you install your OM USB 1208FS run Windows Update to update your operating system with the latest HID and USB drivers To connect the OM USB 1208FS to your system Turn your computer on and connect the USB cable to a USB port on your computer or to an external USB hub that is connected to your computer The USB cable provides power and communication to the OM USB 1208FS When you connect the OM USB 1208FS for the first time a seri
21. ge Input Voltage K Output Code 2048 4095 FS Figure 9 Ideal ADC transfer function The OM USB 1208FS offset error is measured at mid scale Ideally a zero volt input should produce an output code of 2048 Any deviation from this is an offset error Figure 10 shows the OM USB 1208FS transfer function with an offset error The typical offset error specification on the 10 V range is 9 77 mV Offset error affects all codes equally by shifting the entire transfer function up or down along the input voltage axis The accuracy plots in Figure 10 are drawn for clarity and are not drawn to scale 18 OM USB 1208FS User s Guide Functional Details Input Voltage Offset 9 77 mV Output Code Actual dur Figure 10 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 11 shows the OM USB 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 11 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 P4 lt 7 lt lt Actual Output Code I 4095 Figure 11 ADC Transfer function with gain error For example the OM USB 1208FS exhibits a typical calibrated gain error of 0 2
22. gital outputs 26 OM USB 1208FS User s Guide Specifications General Table 18 General specifications Parameter Conditions Specification Device type USB 2 0 full speed Device compatibility USB 1 1 USB 2 0 Environmental Table 19 Environmental specifications Operating temperature range 0 to 70 C Storage temperature range 40 to 70 C Humidity 0 to 90 non condensing Mechanical Table 20 Mechanical specifications Dimensions 79 millimeters mm long x 82 mm wide x 25 mm high USB cable length 3 meters max User connection length 3 meters max Main connector and pin out Table 21 Main connector specifications Connector type Screw terminal Wire gauge range 16 AWG to 30 AWG 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 AZ 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 L 20 CTR 40 GND 27 OM USB 1208FS User s Guide Specifications 8 channel sing
23. gnal as a clock input to a second USB by connecting it to the SYNC pin of the second USB When used as a clock input the SYNC pin operates in one of two modes Continuous or Gated In the default Continuous mode a OM USB 1208FS ignores the first clock pulse in order to ensure adequate setup time Use this mode if the unit is being paced from a continuous clock source such as a generator In the Gated mode it is assumed that the clock signal will be held off for an adequate amount of time for setup to occur No clock pulses are ignored Use this mode if the OM USB 1208FS is set up as a slave and the source of the external clock is another USB The SYNC pin pin 19 is set for pacer output by default To set it to input requires a software command see Figure 13 below To synchronize a master OM USB 1208FS with a slave OM USB 1208FS and acquire data follow the steps below 1 Connect the SYNC pin of the master OM USB 1208FS to the SYNC pin of the slave OM USB 1208FS 2 Run nstaCal 3 From the PC Board List on the InstaCal main form double click on the OM USB 1208FS you want to use as a slave The Board Configuration dialog opens 4 Select Gated from the Ext Clock Type drop down list 5 Set the Universal Library EXTCLOCK option with cbAInScan AInScan for the slave OM USB 1208FS to enable pacing from the master USB device This nstaCal option does not affect internally paced acquisition It only affects scans that use
24. ignal CHHI oy L 4V 8V Differential 8V 4V CHLO v 4V Figure 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 6 14 OM USB 1208FS User s Guide Functional Details 15V GHH H V ouo H V 7V 8V Differential 8V Measured Signal Figure 6 Differential voltage example common mode voltage of 11 V If you decrease the common mode voltage to 7 V the differential stays at 8 V However the solution now violates the input range condition of 10 V to 20 V The voltage on each analog input now swings from 3 V to 11 V Voltages between 10 V and 3 V are resolved but those below 10 V are clipped see Figure 7 3V CHHI y 11V cHLO V 11V 8V Differential 7V Measured Signal Figure 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 ra
25. irst When you connect an HID to your system your computer automatically detects it and configures the necessary software You can connect and power multiple HID peripherals to your system using a USB hub You can run up to two OM USB 1208FS units on most computers You can connect your system to various devices using a standard four wire cable The USB connector replaces the serial and parallel port connectors with one standardized plug and port combination You do not need a separate power supply module The USB automatically delivers the electrical power required by each peripheral connected to your system Data can flow two ways between a computer and peripheral over USB connections Chapter 2 Installing the OM USB 1208FS What comes with your OM USB 1208FS shipment As you unpack your OM USB 1208FS verify that the following components are included Hardware OM USB 1208FS shown with cable USB cable 2 meter length Additional documentation In addition to this hardware user s guide you should also receive the OMB DAQ 2416 Series and OM USB Series Data Acquisition Sofiware User s Guide This booklet supplies a brief description of the software you received with your OM USB 1208FS and information regarding installation of that software Please read this booklet completely before installing any software or hardware Unpacking the OM USB 1208FS As with any electronic device you should take care while handlin
26. le ended mode Pin Signal Name Pin Signal Name 1 CHO IN 21 Port AO 2 CH1 IN 22 Port A1 3 AGND 23 Port A2 4 CH2 IN 24 Port A3 5 CH3 IN 25 Port A4 6 AGND 26 Port A5 7 CH4 IN 27 Port A6 8 CH5 IN 28 Port A7 9 AGND 29 GND 10 CH6 IN 30 PC 5V 11 CH7 IN 31 GND 12 AGND 32 Port BO 13 D A OUT 0 33 Port B1 14 D A OUT 1 34 Port B2 15 AGND 35 Port B3 16 CAL 36 Port B4 17 GND 37 Port B5 18 TRIG_IN 38 Port B6 19 SYNC 39 Port B7 20 CTR 40 GND 28 WARRANTY DISCLAIMER OMEGA ENGINEERING INC warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase OMEGA s WARRANTY adds an additional one 1 month grace period to the normal one 1 year product warranty to cover handling and shipping time This ensures that OMEGA s customers receive maximum coverage on each product If the unit malfunctions it must be returned to the factory for evaluation OMEGA s Customer Service Department will issue an Authorized Return AR number immediately upon phone or written request Upon examination by OMEGA if the unit is found to be defective it will be repaired or replaced at no charge OMEGA s WARRANTY does not apply to defects resulting from any action of the purchaser including but not limited to mishandling improper interfacing operation outside of design limits improper repair or unauthorized modification This WARR
27. n 5 5 V absolute max Input low voltage 1 0 V max 0 5 V absolute min Output high voltage Note 7 IOH 2 5 mA 3 3 V min No load 3 8 V min Output low voltage Note 7 IOL 2 2 5 mA 1 1 V max No load 0 6 V max Note 7 Counter SYNC is a Schmitt trigger input and is over current protected with a 200 Q series resistor Table 14 Counter specifications Pin name Note 8 CTR Counter type Event counter Number of channels 1 Input type TTL rising edge triggered Input source CTR screw terminal Resolution 32 bits Schmidt trigger hysteresis 20 mV to 100 mV Input leakage current uA Maximum input frequency 1 MHz High pulse width 500 ns min Low pulse width 500 ns min Input high voltage 4 0 V min 5 5 V absolute max OM USB 1208FS User s Guide Specifications Input low voltage 1 0 V max 0 5 V absolute min Note 8 CTR is a Schmitt trigger input protected with a 1 5K Q series resistor Non volatile memory Table 15 Non volatile memory specifications EEPROM 1 024 bytes EEPROM Configuration Address Range Access Description 0x000 0x07F Reserved 128 bytes system data 0x080 0x 1 FF Read write 384 bytes cal data 0x200 0x3FF Read write 512 bytes user area Microcontroller Table 16 Microcontroller specifications Type High performance 8 bit RISC microcontroller
28. nge criteria The table below shows some possible inputs and the expected results Sample inputs and differential results CHHI CHLO Result 20 V OV In Valid 15 V 5 V In Valid 10 V OV 10 V 10 V 10 V 20 V OV 10 V 10 V OV 20 V 20 V 10 V 10 V 20 V 10 V OV 10 V 15 V 5 V 20 V 20 V 0 20 V 15 OM USB 1208FS User s Guide Functional Details For more information on analog signal connections For more information on single ended and differential inputs refer to the the OMB DAQ 2416 Series and OM USB Series General Guide to Signal Connections available on our web site at www omega com manuals manualpdf M4830 pdf Analog output terminals D A OUT 0 and D A OUT 1 You can connect up to two analog output connections to the screw terminal pins 13 and 14 D A OUT 0 and D A OUT 1 Refer to the pinout diagrams on page 13 for the location of these pins Each channel can be paced individually at rates up to 10 000 updates per second Both channels can be paced simultaneously using the same time base at 5000 updates per channel The 0 4 096 V output range provides a convenient 1 mV per LSB when setting the output voltage levels Digital I O terminals Port AO to A7 and Port BO to B7 You can connect up to 16 digital I O lines to the screw terminal containing pins 21 to 40 Port AO to Port A7 and Port BO to Port B7 Refer to the pinout diagrams on page 13 fo
29. ore information on synchronizing multiple units refer to page 21 Counter terminal The CTR connection pin 20 is input to the 32 bit external event Refer to the pinout diagrams on page 13 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 17 OM USB 1208FS User s Guide Functional Details Accuracy The overall accuracy of any instrument is limited by the error components within the system Quite often resolution is incorrectly used to quantify the performance of a measurement product While 12 bits or 1 part in 4096 does indicate what can be resolved it provides little insight into the quality of an absolute measurement Accuracy specifications describe the actual results that can be realized with a measurement device There are three types of errors which affect the accuracy of a measurement system offset gain nonlinearity The primary error sources in the OM USB 1208FS are offset and gain Nonlinearity is small in the OM USB 1208FS and is not significant as an error source with respect to offset and gain Figure 9 shows an ideal error free OM USB 1208FS transfer function The typical calibrated accuracy of the OM USB 1208FS is range dependent as explained in the Specifications chapter on page 22 We use a 10 V range here as an example of what you can expect when performing a measurement in this ran
30. ove 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 OM USB 1208FS Refer to the pinout diagrams on page 13 for the location of this pin Calibration of the OM USB 1208FS is software controlled via InstaCal Ground terminals The four analog ground AGND connections provide a common ground for all OM USB 1208FS input channels Four ground GND connections provide a common ground for the DIO TRIG_IN CTR SYNC and PC 5V connections Refer to the pinout diagrams on page 13 for the location of the AGND and GND pins External trigger terminal The TRIG IN connection pin 18 can be configured for either rising or falling edge Refer to the pinout diagrams on page 13 for the location of the TRIG IN terminal pin SYNC terminal The SYNC connection pin 19 is a bidirectional I O signal You can use it for two purposes Configure as an external clock input to externally source the A D conversions The SYNC terminal supports TTL level input signals of up to 50 kHz Configure as an output to synchronize with a second USB unit and acquire data from 16 channels Refer to the pinout diagrams on page 13 for the location of this pin For m
31. pin out kaat Analog input terminals CHO IN CH7 TTT 13 Analog output terminals D A OUT 0 and D A OUT lees 16 Digital I O terminals Port AO to A7 and Port BO to B7 16 Powertermunals 25 5 5 8 eere Lads onc iit E Et 16 Calibration terminal see ee vli Ground terminals 5 n oet re emerit deae ee rare EGER ES we N External trigger terminal eese 2517 SYNC terminal 2 25 eA onudesel vn oreet tr ere seiten sz n Co nter terminal inanem mipimmeden nm einen RERO 17 PS CCULACY So eR vate ER o meu ed Nd 18 OM USB 1208FS channel gain queue feature sss sese eee 20 Synchronizing multiple units 5 toner ninth RE ER emanate Pare Eeen elesek E 21 Chapter 4 SPCCIHICATI ONS cem PDC D 22 Amialog AnpUt seii reor erepto eto dme Ur e 22 DIGOR OUE s aea tite nan a et a e OE A det P 24 Digital anput o tput i eie ide iet epa oe eee pcc EP a rer dp tette 24 Extertiali trig Of A ire an ER Re aah dr e e E OS ri PE RR Cree o e eere 25 External clock miput outp t 5 oti fet tta ete dst Ht eic ee ti pec 25 ieu d IE 25 Non volatile memory 22 Siem A eA e RI n tested 26 OM USB 1208FS User s Guide Gener alll sz n te Beare isk ene teen aquae tee Environmental Mechanical ii uude M Main on ector a d E ee 27 4 channel differential mode e nni an ee EO A RREO e TA t ATOE 27 STS ES h s e E E EE E RE EREE EE EE R AE E REE REE Ea 2
32. r The USB connector is on the right side of the OM USB 1208FS This connector provides 5 V power and communication The voltage supplied through the USB connector is system dependent and may be less than 5 V No external power supply is required LED The LED on the front of the housing indicates the communication status of the OM USB 1208FS It uses up to 5 mA of current and cannot be disabled The table below defines the function of the OM USB 1208FS LED LED Illumination LED Illumination Indication Steady green The OM USB 1208FS is connected to a computer or external USB hub Blinks continuously Data is being transferred Screw terminal wiring The OM USB 1208FS has two rows of screw terminals one row on the top edge of the housing and one row on the bottom edge Each row has 20 connections Pin numbers are identified in Figure 4 Pin 20 Pin 1 89000908000 09029089009 OF OMEGA 025600099900009600990 pO Pin 40 Pin 21 Figure 4 OM USB 1208FS Screw terminal pin numbers Screw terminal pins 1 20 The screw terminals on the top edge of the OM USB 1208FS pins 1 to 20 provide the following connections Eight analog input connections CHO IN to CH7 IN Two analog output connections D A OUT 0 to D A OUT 1 One external trigger source TRIG IN One SYNC terminal for external clocking and multi unit synchronization SYNC One calibration terminal CAL
33. r 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 schematic shown in Figure 8 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 T GND 5V Figure 8 Schematic showing switch detection by digital channel Port AO For more information on digital signal connections For more information on digital signal connections and digital I O techniques refer to the OMB DAQ 2416 Series and OM USB Series General Guide to Signal Connections available on our web site at www omega com manuals manualpdf M4830 pdf Power terminals The PC 5V connection pin 30 is on the bottom screw terminal of the OM USB 1208FS Refer to the pinout diagrams on page 13 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 OM USB 1208FS and possibly the computer The maximum total output current that can be drawn from all OM USB 1208FS connections power analog and digital outputs is 420 mA This maximum applies to most personal computers and self powered USB hubs Bus powered hubs and notebook comp
34. ro 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 z 2 5 mA Power on and reset state Input 24 OM USB 1208FS User s Guide Specifications External trigger Table 12 Digital trigger specifications Parameter Conditions Specification Trigger source Note 6 External Digital TRIG_IN Trigger mode Software selectable Edge sensitive user configurable for CMOS compatible rising or falling edge Trigger latency 10 us max Trigger pulse width 1 us min Input high voltage 4 0 V min 5 5 V absolute max Input low voltage 1 0 V max 0 5 V absolute min Input leakage current 1 0 uA Note 6 External clock input output TRIG IN is a Schmitt trigger input protected with a 1 5 kilohm kQ series resistor Table 13 External clock I O specifications Parameter Conditions Specification Pin name SYNC Pin type Bidirectional Software selectable direction Output default Outputs internal A D pacer clock Input Receives A D pacer clock from external source Input clock rate 50 KHz maximum Clock pulse width Input mode 1 us min Output mode 5 us min Input leakage current Input mode 1 0 uA Input high voltage 4 0 V mi
35. shown here USB G 1 2 4 5 8 10 16 20 Full speed USB 2 0 Compliant Interface Analog Input 8 single ended 11 bit channels or 4 differential 12 bit channels USB Microcontroller Analog Output TRIG IN 2 channels 12 bit 10329UU09 O I jeuiuue Ma12S Screw terminal I O connector CAL 32 bit Event Counter 1 channel Figure 2 OM USB 1208FS functional block diagram Software features For information on the features of InstaCal and the other software included with your OM USB 1208FS refer to the OMB DAQ 2416 Series and OM USB Series Data Acquisition Software User s Guide that shipped with your device OM USB 1208FS User s Guide Introducing the OM USB 1208FS Connecting a OM USB 1208FS to your computer is easy Installing a data acquisition device has never been easier The OM USB 1208FS relies upon the Microsoft Human Interface Device HID class drivers The HID class drivers ship with every copy of Windows that is designed to work with USB ports We use the Microsoft HID because it is a standard and its performance delivers full control and maximizes data transfer rates for your OM USB 1208FS No third party device driver is required The OM USB 1208FS is plug and play There are no jumpers to position DIP switches to set or interrupts to configure You can connect the OM USB 1208FS before or after you install the software and without powering down your computer f
36. the EXTCLOCK option An example of a master slave configuration is shown below Set the Universal Library Master i EXTCLOCK option with OM USB 1208FS i OM USB 1208FS cbAInScan AInScan for the slave device Configure the Configure the SYNC pin SYNC pin for output for input Figure 13 Configuring for synchronous data acquisition When you are operating one OM USB 1208FS do not set the EXTCLOCK option unless you are using an external clock for A D pacing 21 Chapter 4 Specifications All specifications are subject to change without notice Typical for 25 C unless otherwise specified Specifications in italic text are guaranteed by design Analog input Table 1 Analog input specifications Parameter Conditions Specification A D converter type Successive approximation type Input voltage range for linear operation CHx to GND 10 volts V max single ended mode Input common mode voltage range for linear CHx to GND 10 V min 20 V max operation differential mode Absolute maximum input voltage CHx to GND 28 V max Input impedance 122KOhm Input current Note 1 Vin 10 V 70 microamperes uA typ Vin 0V 12 uA typ Vin 10 V 94 uA typ Number of channels 8 single ended 4 differential software selectable Input ranges single ended mode 10 V G 2 Input ranges differential mode 20 V G 1 10 V G 2 5 V G 4 4 V G 5 2 5 V G 8 2 0 V G 10 1 25 V
37. uters may limit the maximum available output current to 100 mA Just connecting the OM USB 1208FS to your computer draws 80 mA of current from the USB 5 V supply Once you start running applications with the OM USB 1208FS each DIO bit can draw up to 2 5 mA and each analog output can draw 15 mA The maximum amount of 5 V current available for experimental use over and above that required by the OM USB 1208FS is the difference between the total current requirement of the 16 OM USB 1208FS User s Guide Functional Details USB based on the application and the allowed current draw of the PC platform 500 mA for desktop PCs and self powered hubs or 100 mA for bus powered hubs and notebook computers With all outputs at their maximum output current you can calculate the total current requirement of the OM USB 1208FS USB 5 V as follows OM USB 1208FS 80 mA 16 DIO 2 5 mA ea 2 AO 15 mA ea 150 mA For an application running on a PC or powered hub the maximum available excess current is 500 mA 150 mA 350 mA This number is the total maximum available current at the PC 5 V screw terminals Measurement Computing highly recommends that you figure in a safety factor of 2096 below this maximum current loading for your applications A conservative safe user maximum in this case would be in the 350 380 mA range Since laptop computers typically allow up to 100 mA the OM USB 1208FS in a fully loaded configuration may be ab
38. wn in the table below Sample channel gain queue list Element Channel Range 0 CHO BIPI0V 1 CHO BIPSV 2 CH7 BIP1OV 3 CH2 BIPIV When a scan begins with the gain queue enabled the OM USB 1208FS reads the first element sets the appropriate channel number and range and then acquires a sample The properties of the next element are then retrieved and another sample is acquired This sequence continues until all elements in the gain queue have been selected When the end of the channel list is detected the sequence returns to the first element in the list This sequence repeats until the specified number of samples is gathered You must carefully match the gain to the expected voltage range on the associated channel otherwise an over range condition can occur Although this condition does not damage the OM USB 1208FS it does produce a useless full scale reading It can also introduce a long recovery time from saturation which can affect the next measurement in the queue 20 OM USB 1208FS User s Guide Functional Details Synchronizing multiple units You can run up to two OM USB 1208FS units on most computers You can connect the SYNC pin of two OM USB 1208FS units together in a master slave configuration and acquire data from the analog inputs of both devices using one clock When the SYNC pin is configured as an output the internal A D pacer clock is sent to the screw terminal You can use this si
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