USB-1408FS User's Guide - from Measurement Computing
Contents
1. You start a hardware paced scan with a software command Optionally hardware paced scans can be delayed by an external hardware trigger event USB 1408FS User s Guide Functional Details External components The external components screw terminal banks LED and USB connector are shown in Figure 2 1 Screwterminal pins 21 to 40 3 Screw terminal pins 1 to 20 2 LED USB connector 4 USB connector Figure 2 External components The USB connector provides 5V power and communication No external power supply is required LED The LED indicates the communication status it cannot be disabled LED states are listed in the table below LED behavior LED Illumination Indication Steady green The USB 1408FS is connected to a computer or external USB hub Blinks continuously Data is being transferred Screw terminals The screw terminals 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 16 digital I O connections PortAO to Port A7 and Port BO to Port B7 One external trigger input TRIG IN One SYNC I O for external clocking and multi unit synchronization SYNC One external event counter input CTR One voltage output 2 5VREF One power output PC 5 V Five analog ground connections AGND and four ground connections GND Use 16 AWG to 30 AWG wire wh2. 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 45V 11 CH7 IN 31 GND 12 AGND 32 Port BO 13 D A OUT 0 33 Port B1 14 D A OUT 1 34 Port B2 15 AGND 35 Port B3 16 2 5VREF 36 Port B4 17 GND 37 Port B5 18 TRIG_IN 38 Port B6 19 SYNC 39 Port B7 20 CTR 40 GND 27 CE Declaration of Conformity Manufacturer Measurement Computing Corporation Address 10 Commerce Way Suite 1008 Norton MA 02766 USA Category Electrical equipment for measurement control and laboratory use Measurement Computing Corporation declares under sole responsibility that the product USB 1408FS to which this declaration relates is in conformity with the relevant provisions of the following standards or other documents EC EMC Directive 2004 108 EC Electromagnetic Compatibility EN 61326 1 2006 IEC 61326 1 2005 Emissions EN 55011 1990 CISPR 11 Radiated emissions Group 1 Class A EN 55011 1990 CISPR 11 Conducted emissions Group 1 Class A Immunity EN61326 1 2006 IEC 61326 1 2005 Table 3 Immunity requirements for equipment used in controlled EM environments EC 61000 4 2 2001 Electrostatic Discharge immunity EC 61000 4 3 2002 Radiated Electromagnetic Field immunity To maintain the safety emission and immunity standards of this declaration the following conditions must be met T
3. a dead band digital input code region In this case changes in digital input code at values less than 0x040 may not produce a corresponding change in the output voltage The USB 1408FS offset error is tested and specified at code 0x040 Digital I O Table 9 Digital I O specifications Parameter Specification 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 All pins pulled up to 5V via 47 kQ resistors default Hardware with p n 193331x where x is the revision letter may be changed to pull down using an internal jumper Other hardware versions can be configured for pull down at the factory Input high voltage threshold 2 0 V min Input high voltage limit 5 5 V absolute max Input low voltage threshold 0 8 V max Input low voltage limit 0 5 V absolute min 0 V recommended min Output high voltage 3 84 V min IOH 6 0 mA Output low voltage 0 33 V max IOL 6 0 mA Power on and reset state Input 22 USB 1408FS User s Guide Specifications External trigger Table 10 External digital trigger specifications Parameter Conditions Specification Trigger source External digital TRIG IN Trigger mode Software selectable Edge sensitive user configurable for CMOS compatible rising or falling edge Trigger l
4. 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 Connect the wire carrying the signal to be measured to CH IN Connect the second wire to AGND The input range for single ended mode is 10 V Single ended measurements using differential channels To perform a single ended measurement using differential channels connect the signal to the CH IN HI input and ground the associated CH 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 Connect the wire carrying the signal to be measured to CH IN HI Connect the wire carrying the reference signal to CH IN LO Connect the third wire to GND A low noise precision programmable gain amplifier PGA is available on differential channels to provide gains of up to 20 and a dynamic range of up to 14 bits Differential mode input voltage ranges are 20 V 10 V ES V 4 V 22 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 v
5. face some harsh environments some harsher than the boards are designed to withstand Contact MCC to determine your product s eligibility for this program 30 Day Money Back Guarantee Any Measurement Computing Corporation product may be returned 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 These warranties are in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for a particular application The remedies provided herein are the buyer s sole and exclusive remedies Neither Measurement Computing Corporation nor its employees shall be liable for any direct or indirect special incidental or consequential damage arising from the use of its products even if Measurement Computing Corporation has been notified in advance of the possibility of such damages Trademark and Copyright Information Measurement Computing Corporation InstaCal Universal Library and the Measurement Computing logo are either trademarks or registered trademarks of Measurement Computing Corporation Refer to the Copyrights amp Trademarks section on mecdag com legal for more information about Measurement Computing trademarks Other product and company names mentioned herein are trademarks or trade names of their respective companies 2014 Measurement Computing Corporation A
6. to bus powered hub 4 1 V min 5 25 V max Output current Note 9 Connected to self powered hub 420 mA max Connected to externally powered root port hub Connected to bus powered hub 20 mA max Note 7 This is the total current requirement for the USB 1408FS which includes up to 10 mA for the status Note 8 LED 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 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 9 Output current refers to the total amount of current that can be sourced from the USB 5 V analog outputs and digital outputs General Table 16 General specifications Parameter Specification Device type USB 2 0 full speed Device compatibility USB 1 1 USB 2 0 Environmental Table 17 Environmental specifications Parameter Specificati
7. 1 385 0 750 1 225 o 1 600 S Maximum Component Height Top 0 545 Bottom 0 125 1 05 3 10 55003j5052 5502 00059 3 20 Figure 15 Circuit board top and enclosure dimensions 19 Chapter 4 Specifications AII 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 AID converter type Successive approximation type Input voltage range for linear operation CHx to GND 10 V max single ended mode Input common mode voltage range for CHx to GND 10 V min 20 V max linear operation differential mode Absolute maximum input voltage CHx to GND 28 V max Input impedance 122 kQ Input current Note 1 Vin 10 V 70 uA typ Vin 20V 12 pA typ Vua 10V 94 uA typ Number of channels Software selectable 8 single ended 4 differential Input ranges single ended mode 10 V G2 Input ranges differential mode 20 V G l 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 G 16 1 0 V G 20 Software selectable Throughput Note 2 Software paced 250 S s typ PC dependent Hardware paced 48 kS s Channel gain queue Up to 16 elements Software configurable channel range and gain Resolution Note 3 Differential 14 bits no missing codes S
8. 8FS User s Guide Grote RERO lecito itato lecita Environmental Mechanical i rai E A Screw terminal connector siii ERR ias 26 Differential mode pinouti a ortae beret e aite edi p re REP COTES 26 Simngle ended mode pino ut 5 ecce REO ERREUR claws sath de EISE IRR 27 Declaration of Conformlity 2 iie dadas nn rincon recen 28 Preface About this User s Guide What you will learn from this user s guide This user s guide describes the Measurement Computing USB 1408FS data acquisition device and lists device specifications Conventions in this user s guide For more information about 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 bold text Bold text is used for the names of objects on a screen such as buttons text boxes and check boxes italic text Italic text is used for the names of manuals and help topic titles and to emphasize a word or phrase Where to find more information Additional information about the USB 1408FS is available on our website at www mccdaq com You can also contact Measurement Computing Corporation by phone fax or email with specific questions Knowledgebase kb mccdaq com Phone 508 946 5100 and follow the instructions fo
9. R SYNC TRIG_IN GND 2 5VREF AGND D A OUT 1 D A OUT 0 AGND CH7 IN CH6 IN AGND CH5 IN CH4 IN AGND CH3 IN CH2 IN AGND CHI IN CHO IN CTR SYNC TRIG_IN GND 2 5VREF AGND D A OUT 1 D A OUT 0 AGND CH3 IN LO CH3 IN HI AGND CH2 IN LO CH2 IN HI AGND CH1IN LO CH1 IN HI AGND CHO IN LO CHO IN HI Counter input Sync I O Trigger input Ground Voltage output Analog ground AO channel 1 AO channel 0 Analog ground AI channel 7 AI channel 6 Analog ground AI channel 5 AI channel 4 Analog ground AI channel 3 AI channel 2 Analog ground AI channel 1 AI channel 0 Counter input Sync I O Trigger input Ground Voltage output Analog ground AO channel 1 AO channel 0 Analog ground AI channel 3 Al channel 3 Analog ground AI channel 2 AI channel 2 Analog ground AI channel 1 AI channel 1 Analog ground AI channel 0 AI channel 0 11 USB 1408FS User s Guide Functional Details Signal connections Analog input You can connect up to eight analog input connections to the screw terminal containing pins 1 to 20 CHO IN through CH7 IN 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 14 bit resolution When configured for single ended mode each analog input has 13 bit resolution due to restrictions imposed by the A D converter Single ended configuration When all of the analog input
10. USB 1408FS Analog and Digital I O User s Guide Document Revision 10 Fa QU FA MEASUREMENT i AWK 928 COMPUTING Copyright 2014 Your new Measurement Computing product comes with a fantastic extra Management committed to your satisfaction Thank you for choosing a Measurement Computing product and congratulations You own the finest and you can now enjoy the protection of the most comprehensive warranties and unmatched phone tech support It s the embodiment of our mission To provide data acquisition hardware and software that will save time and save money Simple installations minimize the time between setting up your system and actually making measurements We offer quick and simple access to outstanding live FREE technical support to help integrate MCC products into a DAQ system Limited Lifetime Warranty Most MCC products are covered by a limited lifetime warranty against defects in materials or workmanship for the life of the product to the original purchaser unless otherwise noted Any products found to be defective in material or workmanship will be repaired replaced with same or similar device or refunded at MCC s discretion For specific information please refer to the terms and conditions of sale Harsh Environment Program Any Measurement Computing product that is damaged due to misuse or any reason may be eligible for replacement with the same or similar device for 50 of the current list price I O boards
11. alling the USB 1408FS TH 7 What comes with your shipment Hardware Software Documentation Unpacking isc eee iL asa Le ansia nessi ot 7 Installime th SOftWare rrr EP RP RO FREIE TER PER RETE FF ERNEUT A 7 Installims the hardwaf e i T aE 7 Calibrating the USB TAO0SES agi tote E i etg ee Doe inten Upton DIR pet 8 Chapter 3 atl uiDnrisucics 9 Analog iip t acquisition Todes o cerent alal alare 9 Software paced eee te E te A A A EN 9 Hardware paeediz annsan O RR deer c c I O Ent S DA Ud E Ned eL desee 9 External components eR ie ea lected UII Ue ope deep aie 10 USB connector S12NAl COMNECHONS ER 12 A Mal OB ANPUE cas AR RIA ER Analog output Digital I O Counter input gredi SYNC IO Ground 2 SVREF output POWet OUtpUt ao HR REFERS AERE PTS HE PI Ie D eene HE UM EE i LATI ACTUA Synchronized Operations ses tdem aaa aaa dall Mechanical da MESA ARI E 19 Chapter 4 Specifications ol Lia ULI LL RL Al ire 20 Analog Input EE 20 Analog output esenea n E AA NRE IENA RA atri 21 Digital VO iatale BAS lia lione nia sala e 22 External e dd edis 23 External clock TSS 1 then ect ree RFT De DERE Te assale Deer erso Si 23 COUNTET SECUONI MEE 24 Nonvolatileanemoty AN 24 USB 140
12. atency 10 us max Trigger pulse width 1 us min Input type Schmitt trigger 47 kQ pull down to ground Schmitt trigger 1 01 V typ hysteresis 0 6 V min 1 5 V max Input high voltage 2 43 V typ threshold 1 9 V min 3 1V max Input high voltage limit 5 5 V absolute max Input low voltage 1 42 V typ threshold 1 0 V min 2 0 V max Input low voltage limit 0 5 V absolute min 0 V recommended min External clock input output Table 11 External clock I O specifications Parameter Conditions Specification Pin name SYNC Pin type Bidirectional Direction Output Outputs internal A D pacer clock Active on rising edge software selectable Input default Receives A D pacer clock from external source Active on rising edge Input clock rate 48 kHz maximum Clock pulse width Input mode 1 us min Output mode 5 us min Input type Schmitt trigger 47 kQ pull down to ground Schmitt trigger 1 01 V typ hysteresis 0 6 V min 1 5 V max Input high voltage 2 43 V typ threshold 1 9 V min 3 1V max Input high voltage limit 5 5 V absolute max Input low voltage 1 42 V typ threshold 1 0 V min 2 0 V max Input low voltage limit 0 5 V absolute min 0 V recommended min Output high voltage 4 4 V min IOH 50 uA 3 80 V min IOH 8 mA Output low voltage 0 1 V max IOL 50 A 0 44 V max IOL 8 mA 23 USB 1408FS User s Guide Specifications Counter s
13. booklet is available in PDF at www mccdaq com PDFmanuals DAQ Software Quick Start pdf Installing the hardware Be sure you are using the latest system software Before installing the device run Windows Update to update your operating system with the latest HID and USB drivers To connect the USB 1408FS to your system connect the USB cable to a USB port on your computer or to an external USB hub that is connected to your computer The USB cable provides power and communication to the USB 1408FS The USB 1408FS installs as a composite device with separate devices attached When you connect the USB 1408FS for the first time a Found New Hardware dialog opens as each device interface is detected This is normal After the device is installed its LED will blink and then remain on This indicates that communication is established between the USB 1408FS and your computer USB 1408FS User s Guide Installing the USB 1408FS If the LED turns off If communication is lost between the device and the computer the device LED turns off Disconnect the USB cable from the computer and then reconnect it This should restore communication and the LED should turn on Allow the USB 1408FS to operate for at least 30 minutes before using the device This warm up time is required to achieve the specified rated accuracy of measurements Calibrating the USB 1408FS The USB 1408FS is shipped fully calibrated Calibration coefficients are sto
14. ccuracy 0 C to 50 C zmV 10 V 10 98 49 08 Table 4 Noise performance differential mode Range Typical counts Least significant bitroot mean square LSBrms 20 V 8 1 21 10 V 8 1 21 5 V 9 1 36 4 V 10 1 51 2 5 V 12 1 81 2 V 14 2 12 1 25 V 18 2 72 1 V 22 3 33 Table 5 Noise performance single ended mode Range Typical Counts LSBrms 10 V 8 0 1 21 Analog output Table 6 Analog output specifications Parameter Conditions Specification Resolution 12 bits 1 in 4096 Output range 0 V to 4 096 V 1 mV per LSB Number of channels 2 Throughput Note 5 Software paced 250 S s single channel typical PC dependent Single channel continuous scan 10 kS s Dual channel continuous scan 5 kS s simultaneous update Power on and reset voltage OV 20 mV typ initializes to 000h code Output drive Each D A OUT 15 mA Slew rate 0 8 V us typ Note 5 Maximum throughput scanning from PC memory is machine dependent 21 USB 1408FS User s Guide Specifications Table 7 Analog output accuracy Range Accuracy LSB 0 V to 4 096 V 4 0 typ 45 0 max Table 8 Analog output accuracy components Range 96 of FSR x Gain Error at FS zmV Offset mV Accuracy at FS mV Note 6 0 V to 4 096 V 0 1 typ 0 9 max 4 0 typ 36 0 max 1 0 typ 9 0 max 4 0 typ 45 0 max Note 6 Zero scale offsets may result in a fixed zero scale error producing
15. d produce an output code of 8192 Any deviation from this is an offset error Figure 12 shows an example of a USB 1408FS transfer function with a 2 44 mV offset error Offset error affects all codes equally by shifting the entire transfer function up or down along the input voltage axis The accuracy plots in Figure 12 are drawn for clarity and are not drawn to scale Input Voltage Ideal Offset 2 44 mV ST Output Code 2 44 mV 16383 10V Figure 12 ADC transfer function with offset error Gain error is a change in the slope of the transfer function from the ideal and is typically expressed as a percentage of full scale Figure 13 shows the USB 1408FS 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 13 are drawn for clarity and are not drawn to scale 17 USB 1408FS User s Guide Functional Details Input Voltage Gain error 0 02 or 2 mV Gain error 0 02 or 2 mV lt N E lt lt lt 10V Ideal Actual K Output Code 8192 16383 10V Figure 13 ADC Transfer function with gain error Figure 13 shows an example of a USB 1408FS transfer function with a calibrated gain error of 0 02 or 2 mV This means that at full scale neglecting the effect of offset for the moment the measurement would be within 2 mV of the actual value Note that gai
16. ection Table 12 Counter specifications Parameter Specification Pin name CTR Counter type Event counter Number of channels 1 Input type Schmitt trigger 47 kQ pull down to ground Input source CTR screw terminal Resolution 32 bits Maximum input frequency 1 MHz High pulse width 500 ns min Low pulse width 500 ns min Schmitt trigger hysteresis 1 01 V typ 0 6 V min 1 5 V max Input high voltage threshold 2 43 V typ 1 9 V min 3 1V max Input high voltage limit 5 5 V absolute max Input low voltage threshold 1 42 V typ 1 0 V min 2 0 V max Input low voltage limit 0 5 V absolute min 0 V recommended min Non volatile memory Table 13 Non volatile memory specifications Parameter Specification EEPROM 1 024 bytes EEPROM Configuration Address Range Access Description 0x000 to Ox1FF Read write 512 bytes user area 0x200 to Ox3FF Read write with unlock 512 bytes calibration data Microcontroller Table 14 Microcontroller specifications Parameter Specification Type High performance 16 bit RISC microcontroller 24 USB 1408FS User s Guide Specifications Power Table 15 Power specifications Parameter Conditions Specification Supply current Note 7 80 mA 5V USB power available Connected to self powered hub 4 5 V min 5 25 V max Note 8 Connected to externally powered root port hub Connected
17. electronic components Before removing the USB 1408FS from its housing ground yourself using a wrist strap or touch the computer chassis or other grounded object to eliminate any stored static charge 3 Remove the three screws from the bottom of the device using a 1 Philips head screwdriver Hold both the top and bottom sections together turn the device over and rest it on the surface then carefully remove the top section of the case to expose the circuit board The user configurable jumpers are labeled DIO A and DIO B Figure 9 shows the location of the each jumper on the circuit board 5529202828 H ob60090000n0 TATI 3333090000 Figure 9 Pull up down jumper locations 5 Configure each jumper for pull up or pull down as shown in Figure 10 Use the jumper labeled DIO A to configure Port A and DIO B to configure Port B P UP S 9 P DN S Figure 10 Pull up down jumper configuration 6 Replace the top section of the housing and fasten it to the bottom section with the three screws Counter input The CTR terminal is a 32 bit event counter that can accept frequency inputs up to 1 MHz The internal counter increments when the TTL levels transition from low to high Trigger input The TRIG IN terminal is an external digital trigger input that you can configure for either rising or falling edge SYNC I O The SYNC terminal is a bidirectional I O signal that can be configured as an input default or an output Con
18. en making connections to the screw terminals The single ended mode pinout is shown in Figure 3 10 USB 1408FS User s Guide Functional Details Ground Port B channel 7 Port B channel 6 Port B channel 5 Port B channel 4 Port B channel 3 Port B channel 2 Port B channel 1 Port B channel 0 Ground Power output Ground Port A channel 7 Port A channel 6 Port A channel 5 Port A channel 4 Port A channel 3 Port A channel 2 Port A channel 1 Port A channel 0 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 oooooooooooooooooooQ Figure 3 Single ended mode pinout The differential mode pinout is shown in Figure 4 Ground Port B channel 7 Port B channel 6 Port B channel 5 Port B channel 4 Port B channel 3 Port B channel 2 Port B channel 1 Port B channel 0 Ground Power output Ground Port A channel 7 Port A channel 6 Port A channel 5 Port A channel 4 Port A channel 3 Port A channel 2 Port A channel 1 Port A channel 0 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 oooooooooooooooooooQ Figure 4 Differential mode pinout oooooooooooooooooooQ LN LQ E QG d O amp O oooooooooooooooooooQ AM W E QG N OC Ora da di ca dd eh eh N O mo E WG 4 00 CT
19. figure 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 1408FS and acquire data from 16 channels Refer to Synchronized operations on page 18 for more information 15 USB 1408FS User s Guide Functional Details Ground The analog ground AGND terminals provide a common ground for all analog channels The ground GND connections provide a common ground for the digital trigger counter sync and power terminals 2 5VREF output The 2 5VREF connection is an output terminal that supplies 2 5 volts You can use this pin as the voltage source for another analog channel For example to configure the 2 5VREF pin as the voltage source for channel 0 in SE mode connect 2 5VREF to CHO IN In differential mode connect 2 5VREF to CHO IN HI and connect CH IN LO to AGND Power output The PC 5V terminal is a 5 volt output that is supplied by the computer You can use this terminal to supply power to external devices or circuitry Caution The 5 V terminal is an output Do not connect to an external power supply or you may damage the USB 1408FS and possibly the computer The maximum total output current that can be drawn from all USB 1408FS connections power analog and digital outputs is 420 mA This maximum applies to most personal computers and self powered USB hubs Bus powered hubs a
20. he host computer peripheral equipment power sources and expansion hardware must be CE compliant Equipment must be operated in a controlled electromagnetic environment as defined by Standards EN 61326 1 2006 or IEC 61326 1 2005 Shielded wires must be used for all I Os and must be less than 3 meters 9 75 feet in length The host computer must be properly grounded The host computer must be USB 2 0 compliant A protective ESD wrist strap should be used when connecting or disconnecting leads from screw terminal blocks Note Data acquisition equipment may exhibit noise or increased offsets when exposed to high RF fields gt 1V m or transients Declaration of Conformity based on tests conducted by Chomerics Test Services Woburn MA 01801 USA in February 2006 Test records are outlined in Chomerics Test Report EMI4445 06 Further testing was conducted by Chomerics Test Services Woburn MA 01801 USA in November 2008 Test records are outlined in Chomerics Test report EMI5193 08 We hereby declare that the equipment specified conforms to the above Directives and Standards Pera Carl Haapaoja Director of Quality Assurance Measurement Computing Corporation 10 Commerce Way Suite 1008 Norton Massachusetts 02766 508 946 5100 Fax 508 946 9500 E mail info mccdag com www mccdag com
21. ingle ended 13 bits Integral linearity error 2 LSB typ Differential linearity error 0 5 LSB typ Absolute accuracy long term drift 20 V range 3LSB typ At 1000 hr Note 4 4 V range 6LSB typ At 1000 hr 1 V range 8LSB typ At 1000 hr 2 5VREF accuracy pin 16 36 25 mV max 2 5VREF output current pin 16 Source 5 mA max Sink 20 uA min 100 uA typ Trigger source Software selectable External digital TRIG_IN Note 1 Input current is a function of applied voltage on the analog input channels For a given input voltage Vin the input leakage is approximately equal to 8 181 V n 12 WA Note 2 Maximum throughput scanning to PC memory is machine dependent Note 3 The ADS7871 converter only returns 13 bits 0 to 8192 codes in single ended mode 20 USB 1408FS User s Guide Specifications Note 4 Extrapolating the long term drift accuracy specifications will provide the approximate long term drift of the USB 1408FS intermediate input ranges Table 2 Accuracy differential mode Range Absolute Accuracy 25 C mV Absolute Accuracy 0 C to 50 C zmV 20 V 10 98 49 08 10 V 7 32 33 42 5 V 3 66 20 76 4 V 2 92 19 02 2 5 V 1 83 14 97 2 V 1 70 14 29 1 25 V 1 21 12 18 1 V 1 09 11 63 Table 3 Accuracy single ended mode Range Absolute Accuracy 25 C mV Absolute A
22. ll rights reserved No part of this publication may be reproduced stored in a retrieval system or transmitted in any form by any means electronic mechanical by photocopying recording or otherwise without the prior written permission of Measurement Computing Corporation Notice Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for use in life support systems and or devices without prior written consent from Measurement Computing Corporation Life support devices systems are devices or systems that 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 HM USB 1408FS docx Table of Contents Preface About this User s Guide rrrrrrrrre ceci ce iie eee ceri eee eresie ii eE Ea aere epep ane iii 5 What you will learn from this user s guide eee 5 Conventions in this user s guide neen ren ren oe co renTo tree trennen trennen nee en 5 Where to find more TmTormatiOani RITE E 5 Chapter 1 Introducing the HT nk 1 a iii 6 USB I408FS block diagram aaa nd Aaa aiar Ae di 6 Chapter 2 Inst
23. n error is expressed as a ratio Values near FS are more affected from an absolute voltage standpoint than are values near mid scale which see little or no voltage error Combining these two error sources in Figure 14 we have a plot of the error band of the USB 1408FS for the 10 V range This is a graphical version of the typical accuracy specification of the product The accuracy plots in Figure 14 are drawn for clarity and are not drawn to scale Input Voltage deal 2 44 mV 2 mV Ideal deal 2 44 mV 2 mV Output Code 16383 Ideal 2 44 mV 2 mV gt Ideal 10V Ideal 2 44 mV 2 mV gt Figure 14 Error band plot Synchronized operations You can run up to two USB 1408FS devices on most computers You can connect the SYNC pin of two devices 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 signal is sent to the screw terminal You can output the clock to the SYNC pin of a second device that is configured for A D pacer input 18 USB 1408FS User s Guide Functional Details Mechanical drawings C gaz E GN 0 100 CL 0 025 SQ PINS 0 100 CL 0 025 SQ PINS 40 el e o o e no s o o o O c e Du Ss 2 S78 S e o o N 1 600 e o 1 225 0 750 0 80 0 050 0 000 0 069 0 050
24. nd notebook computers may limit the maximum available output current to 100 mA Just connecting the USB 1408FS to your computer draws 80 mA of current from the USB 5 V supply Once you start running applications with the USB 1408FS each DIO bit can draw up to 2 5 mA and each analog output can draw 15 mA The maximum amount of 5 V current available for experimental use over and above that required by the USB 1408FS is the difference between the total current requirement of the USB based on the application and the allowed current draw of the PC platform 500 mA for desktop PCs and self powered hubs or 100 mA for bus powered hubs and notebook computers With all outputs at their maximum output current you can calculate the total current requirement of the USB 1408FS USB 5 V supply as follows USB 1408FS 80 mA 16 DIO 2 5 mA ea 2 AO 15 mA ea 150 mA For an application running on a PC or powered hub the maximum available excess current is 500 mA 150 mA 350 mA This number is the total maximum available current at the PC 5 V screw terminals Measurement Computing highly recommends that you figure in a safety factor of 2096 below this maximum current loading for your applications A conservative safe user maximum in this case would be 280 mA Since laptop computers typically allow up to 100 mA the USB 1408FS in a fully loaded configuration may be above that allowed by the computer In this case you must determine the per
25. oltage on any 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 710 V to 20 V input range requirement and the differential voltage is suited for the 10 V input range see Figure 5 4V Measured Signal CHHI OV AV 8V Differential 8V 4V CHLO AV Figure 5 Differential voltage example common mode voltage of 0 V 12 USB 1408FS User s Guide Functional Details 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 15V Measured Signal cum V 8V Differential 8V cHto THY 7V 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 3V to 11V Voltages between 10 V and 3 V are resolved but those bel
26. on Operating temperature range 0 C to 70 C Storage temperature range 40 C to 70 C Humidity 0 to 90 non condensing Mechanical Table 18 Mechanical specifications Parameter Specification Dimensions 79 x 82 x 27 mm 3 10 x 3 20 x 1 05 in USB cable length 3 m 9 84 ft max User connection length 3 m 9 84 ft max 25 USB 1408FS User s Guide Specifications Screw terminal connector Table 19 Screw terminal specifications Parameter Specification Connector type Screw terminal Wire gauge range 16 AWG to 30 AWG Differential mode pinout Table 20 4 channel differential mode pinout 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 45V 11 CH3 IN LO 31 GND 12 AGND 32 Port BO 13 D A OUT 0 33 Port B1 14 D A OUT 1 34 Port B2 15 AGND 35 Port B3 16 2 5VREF 36 Port B4 17 GND 37 Port B5 18 TRIG_IN 38 Port B6 19 SYNC 39 Port B7 20 CTR 40 GND 26 USB 1408FS User s Guide Specifications Single ended mode pinout Table 21 8 channel single ended mode pinout Pin Signal Name Pin Signal Name 1 CHO IN 21 Port AO
27. ow 10 V are clipped see Figure 7 3V Measured Signal CHHI y 3V y 8V Differential 7V cHLO 7V 11V 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 range criteria The following table shows some possible inputs and the expected results Sample inputs and differential results CHHI CHLO Result 20V OV Invalid 15 V 5 V Invalid 10 V OV 10V 10V 10 V 20 V OV 10 V 10V OV 20 V 20 V 10 V 10V 20 V 10 V OV 10 V 15 V 5 V 20 V 20 V 0 20 V For more information on analog signal connections For more information on single ended and differential inputs refer to the Guide to Signal Connections this document is available on our web site at www mccdaq com signals signals pdf 13 USB 1408FS User s Guide Functional Details Channel gain queue The channel gain queue feature allows you to set up a scan sequence with a unique per channel gain setting and channel sequence The gain settings are stored in a channel gain queue list that is written to local memory on the device The channel gain queue lis
28. 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 Accuracy The overall accuracy of any instrument is limited by the error components within the system Resolution is often used incorrectly used to quantify the performance of a measurement product While 14 bits or 1 part in 16383 does indicate what can be resolved it provides little insight into the quality of an absolute measurement Accuracy specifications describe the actual measurement achievable with a USB 1408FS There are three types of errors which affect the accuracy of a measurement system offset gain nonlinearity The primary error sources in the USB 1408FS are offset and gain Nonlinearity is small in the USB 1408FS and is not significant as an error source with respect to offset and gain 16 USB 1408FS User s Guide Functional Details Figure 11 shows an example of an ideal error free USB 1408FS transfer function The typical calibrated accuracy of the USB 1408FS is range dependent as explained in the Specifications chapter on page 20 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 N 8192 16383 10V Figure 11 Ideal ADC transfer function The offset error is measured at mid scale Ideally a zero volt input shoul
29. r reaching Tech Support Fax 508 946 9500 to the attention of Tech Support Email techsupport mccdag com Chapter 1 Introducing the USB 1408FS The USB 1408FS is a USB 2 0 full speed analog input and digital I O data acquisition device supported under popular Microsoft Windows operating systems It is designed for USB 1 1 ports and was tested for full compatibility with both USB 1 1 and USB 2 0 ports The USB 1408FS features eight analog inputs two 12 bit analog outputs 16 digital I O connections and one 32 bit external event counter The analog inputs are software configurable for either eight 13 bit single ended inputs or four 14 bit differential inputs The digital I O lines are independently selectable as input or output in two 8 bit ports The 32 bit counter can count TTL pulses A SYNC synchronization I O line allows you to pace the analog input acquisition of one USB module from the clock output of another The USB 1408FS is powered by the 5 volt USB supply from your computer No external power is required USB 1408FS block diagram USB 1408FS functions are illustrated in the block diagram shown here USB Full speed USB 2 0 Compliant Interface Analog Input 8 single ended 13 bit channels or 4 differential 14 bit channels USB Microcontroller Analog Output 2 channels 12 bit Screw terminal I O connector 10j28uuoo QJ jeuruua malos TRIG IN Event Counter 1 channel 32 bi
30. red in EEPROM Return the device to Measurement Computing Corporation when calibration is required The normal calibration interval is once per year Chapter 3 Functional Details Analog input acquisition modes The USB 1408FS can acquire analog input data in either software paced or hardware paced mode Software paced The USB 1408FS acquires data one analog sample at a time using software paced mode 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 The USB 1408FS can attain throughput rates up to 250 S s using a software loop This rate is system dependent Hardware paced The USB 1408FS can acquire data from up to eight channels in hardware paced mode The analog data is acquired and converted to digital values until you stop the scan Data is transferred in blocks of 31 samples from the USB 1408FS to the memory buffer on your computer The A D converter is paced by either an internal or external clock source The maximum sample rate is an aggregate rate The total sample rate for all channels cannot exceed 48 kS s The following table lists the sample rate when scanning from one to eight channels Maximum per channel sample rate channels Sample rate scanned kS s 1 48 2 24 3 16 4 12 5 9 60 6 8 7 6 85 8 6
31. t Figure 1 USB 1408FS functional block diagram Chapter 2 Installing the USB 1408FS What comes with your shipment The following items are shipped with the USB 1408FS Hardware USB 1408FS USB cable Software MCC DAQ CD Documentation In addition to this hardware user s guide you should also receive the Quick Start Guide This booklet provides an overview of the MCC DAQ software you received with the device and includes information about installing the software Please read this booklet completely before installing any software or hardware Unpacking As with any electronic device take care while handling to avoid damage from static electricity Before removing the USB 1408FS from its packaging ground yourself using a wrist strap or touch either the computer chassis or other grounded object to eliminate any stored static charge If the device is damaged notify Measurement Computing Corporation immediately by phone fax or email Knowledgebase kb mccdaq com Phone 508 946 5100 and follow the instructions for reaching Tech Support Fax 508 946 9500 to the attention of Tech Support Email techsupport mccdaq com For international customers contact your local distributor Refer to the International Distributors section on our web site at www mccdaq com International Installing the software Refer to the Quick Start Guide for instructions on installing the software on the MCC DAQ CD This
32. t can contain up to 16 elements in any order An example of a four element list is shown in the table below Sample channel gain queue list Element Channel Range 0 CHO BIP10V 1 CH3 BIP5V 2 CHI BIP10V 3 CH2 BIPIV When a scan begins with the gain queue enabled the USB 1408FS reads the first element sets the appropriate channel number and range and then acquires a sample The properties of the next element are then retrieved and another sample is acquired This sequence continues until all elements in the gain queue have been selected When the end of the channel list is detected the sequence returns to the first element in the list This sequence repeats until the specified number of samples is acquired Carefully match the gain to the expected voltage range on the associated channel or an over range condition may occur Although this condition does not damage the device it does produce a useless full scale reading and can introduce a long recovery time due to saturation of the input channel Analog output You can connect up to two analog output connections to D A OUT 0 and D A OUT 1 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 5 000 updates per channel The 0 V to 4 096 V output range provides a convenient 1 mV per LSB when setting the output voltage levels Digital I O The device has 16 digital bi
33. ts configured as two 8 bit ports Port A and Port B You can connect up to eight digital I O lines to each port terminals Port AO to Port A7 and Port BO to Port B7 Each port is configurable as either input or output When configured 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 A0 reads FALSE GND 5V Figure 8 Schematic showing switch detection by digital channel Port AO Pull up down configuration Later hardware revisions are designed with user configurable internal jumpers to configure the digital bits for pull up default or pull down If the p n of your board is 195920B the default configuration is pull up To configure for pull down the board must be modified at the factory If the p n of your board is 193331x where x is any letter your board has the user configurable internal jumpers The hardware revision is listed with the part number on the bottom of the device for example p n 193331D 14 USB 1408FS User s Guide Functional Details If your board has user configurable jumpers complete the following steps to set the pull up down configuration 1 Unplug the device from the computer 2 Turn the device over and rest the top of the housing on a flat stable surface Caution The discharge of static electricity can damage some
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