USB-6008/6009 User Guide
Contents
1. NATIONAL INSTRUMENTS Bojeuy Digital NI USB 6009 8 Inputs 14 bit Multifunction VO 1 USB Cable Strain Relief Figure 2 USB 6008 6009 Figure 3 USB 6008 6009 Back View Safety Guidelines A Caution Operate the hardware only as described in these operating instructions The following section contains important safety information that you must follow when installing and using the USB 6008 6009 Do not operate the USB 6008 6009 in a manner not specified in this document Misuse of the device can result in a hazard You can compromise the safety protection built into the device if the device is damaged in any way If the device is damaged contact National Instruments for repair Do not substitute parts or modify the device except as described in this document Use the device only with the chassis modules accessories and cables specified in the installation instructions You must have all covers and filler panels installed during operation of the device National Instruments Corporation 3 USB 6008 6009 User Guide Do not operate the device in an explosive atmosphere or where there may be flammable gases or fumes If you must operate the device in such an environment it must be in a suitably rated enclosure If you need to clean the device use a dry cloth Make sure that the device is completely dry and free from contaminants befo2. 2 5 V GND Output 2 5 V External Reference Provides a reference for wrap back testing 5 V GND Output 5 V Power Source Provides 5 V power up to 200 mA PFIO GND Input PFI 0 This pin is configurable as either a digital trigger or an event counter input USB 6008 6009 User Guide 10 ni com Analog Input You can connect analog input signals to the USB 6008 6009 through the VO connector Refer to Table 3 for more information about connecting analog input signals Analog Input Circuitry Figure 6 illustrates the analog input circuitry of the USB 6008 6009 2 5 VREF V 127 KQ E 30 9 kQ a ADC Al FIFO MUX Input Range Selection Figure 6 Analog Input Circuitry MUX The USB 6008 6009 has one analog to digital converter ADC The multiplexer MUX routes one AI channel at a time to the PGA PGA The progammable gain amplifier provides input gains of 1 2 4 5 8 10 16 or 20 when configured for differential measurements and gain of 1 when configured for single ended measurements The PGA gain is automatically calculated based on the voltage range selected in the measurement application A D Converter The analog to digital converter ADC digitizes the AI signal by converting the analog voltage into a digital code National Instruments Corporation 11 USB 6008 6009 User Guide AI FIFO The USB 60
3. Counter Bus Interface ADS AS A tes 0 25 max Reference temperature drift 50 ppm C max Number of counters 1 ResOlition rota ett 32 bits Counter measurements usss Edge counting falling edge Pull up resistor 4 7 KQ to 5 V Maximum input frequency 5 MHz Minimum high pulse width 100 ns Minimum low pulse width 100 ns Input high voltage 2 0 V Input low voltage 0 8 V USB specification sees USB 2 0 full speed USB bus speed 12 Mb s Power Requirements USB 4 10 to 5 25 VDC eine 80 mA typical 500 mA max USB suspend eese 300 uA typical 500 LA max Physical Characteristics USB 6008 6009 User Guide If you need to clean the module wipe it with a dry towel Dimensions Without Connectors 6 35 cm x 8 51 cm x 2 31 cm 2 50 in x 3 35 in x 0 91 in With connectors 8 18 cm x 8 51 cm x 2 31 cm 3 22 in x 3 35 in x 0 91 in 22 ni com T O connectors ccccccccncnnnnnonanananannnonononnnos USB series B receptacle 2 16 position terminal block plug headers Weight With connectors sesssss 84 g 3 oz Without connectors ss 54 g 21 oz Screw terminal wiring 16 to 28 AWG Torque for screw term
4. Examples O National Instruments Corporation 5 USB 6008 6009 User Guide Hardware The following block diagram shows key functional components of the USB 6008 6009 External Power 5 V 200mA Supply Vbus PFIO USB Microcontroller Full Speed USB Interface Digital I O Terminal Block S Un Do 2 5 V CAL Y 8 Channel No 12 14b ADC PAN x K Al lt 0 7 gt 5 T E E 12b DAC AO 0 Q o gt 12b DAC AO 1 amp lt Figure 4 Device Block Diagram USB 6008 6009 User Guide 6 ni com Setting Up Hardware Complete the following steps to set up the hardware 1 Install combicon screw terminal blocks by inserting them into the combicon jacks 3 Note The USB 6008 6009 kit ships with signal labels You can apply the signal labels to the screw terminal blocks for easy signal identification 2 Refer to Table 1 and Figure 5 for label orientation and affix the provided signal labels to the screw terminal blocks Until the signal labels are applied you can insert the screw terminal blocks into either of the combicon jacks Refer to Figure 5 for more information about signal label orientation 1 Overlay Label with Pin Orientation Guides 3 Screw Terminal Blocks 2 Combicon Jack 4 Signal Labels Figure 5 Signal Label Application Diagram 3 Note Once you label th
5. III is for measurements performed in the building installation at the distribution level This category refers to measurements on hard wired equipment such as equipment in fixed installations distribution boards and circuit breakers Other examples are wiring including cables bus bars junction boxes switches socket outlets in the fixed installation and stationary motors with permanent connections to fixed installations Measurement Category IV is for measurements performed at the primary electrical supply installation 1 000 V Examples include electricity meters and measurements on primary overcurrent protection devices and on ripple control units Software support for the USB 6008 6009 is provided by NI DAQmx Base which is a subset of the NI DAQmx API The NI DAQmx Base CD contains example programs that you can use to get started programming with the USB 6008 6009 Refer to the NI DAQmx Base 1 x Getting Started Guide for more information Logging Application NI DAQmx Base includes ready to run datalogging software that allows you to take data measurements without programming first The application is available at Start All Programs National Instruments NI DA Qmx Base Datalogging Software Self Test NI DAQmx Base includes an interactive control panel example that can be used to verify the operation of the USB 6008 6009 The application is located in Start All Programs National Instruments NI DA Qmx Base
6. NATIONAL p INSTRUMENTS Event EMM Es 18 Reference and Power Sources ss 18 32 5 External References rss 18 9 V Power SOU isa ere itte dt ias 19 Specifications i sid e EORR aede iia 19 Analog Input ridad tia rte t e 19 Amalog Output ead e ete 20 Digital O s eite reta ee ent en 21 External Voltage esee Semet tre ner Re RHENO 21 Gron E 22 Bus Interface ii ae RE re E EE LE E ES ERR IRR 22 Power Requirements reir or FUR Eee 22 Physical Characteristics essere 22 Sp A ds 23 Standards oe eee hel e e Au 23 Molar E 23 Hazardous Locations a 24 Environmental r eeen eera a etre eee 24 Electromagnetic Compatibility eese 24 CE Compliancess utei em eme gr 25 Where to Go for Support ss 26 Introduction The NI USB 6008 6009 provides connection to eight analog input AT channels two analog output AO channels 12 digital input output DIO channels and a 32 bit counter when using a full speed USB interface Table 1 1 Differences Between the USB 6008 and USB 6009 Feature USB 6008 USB 6009 AI Resolution 12 bits differential 14 bits differential 11 bits single ended 13 bits single ended Maximum AI Sample Rate 10 kS s 48 kS s DIO Configuration Open drain Open drain or push pull Might be system dependent USB 6008 6009 User Guide 2 ni com
7. The USB 6008 6009 device is intended for indoor use only Operating temperature EC 60068 2 1 and IEC 60068 2 2 0 to 55 C Operating humidity TEC 60068 2 56 sse 10 to 90 RH noncondensing Maximum altitude 2 000 m at 25 C ambient temperature Storage temperature IEC 60068 2 1 and IEC 60068 2 2 40 to 85 C Storage humidity IEC 60068 2 56 sese 5 to 90 RH noncondensing Pollution Degree IEC 60664 2 Electromagnetic Compatibility IS tote tiec eoe eee beet akek etes EN 55011 Class A at 10 m FCC Part 15A above 1 GHz Hirn CHE Industrial levels per EN 61326 1997 A2 2001 Table 1 EMC EMI cocino oa CE C Tick and FCC Part 15 Class A Compliant 3 Note The USB 6008 6009 may experience temporary variations in analog input readings when exposed to radiated and conducted RF noise The device returns to normal operation after RF exposure is removed USB 6008 6009 User Guide 24 ni com CE Compliance This product meets the essential requirements of applicable European Directives as amended for CE marking as follows Low Voltage Directive safety 73 23 EEC Electromagnetic Compatibility Directive EMC eese 89 336 EEC 3 Note Refer to the Declaration of Conformity DoC for this product for any additional regulatory compliance information To obtain the DoC for this product visit ni com certification search by model number
8. or product line and click the appropriate link in the Certification column National Instruments Corporation 25 USB 6008 6009 User Guide Where to Go for Support The National Instruments Web site is your complete resource for technical support At ni com support you have access to everything from troubleshooting and application development self help resources to email and phone assistance from NI Application Engineers A Declaration of Conformity DoC is our claim of compliance with the Council of the European Communities using the manufacturer s declaration of conformity This system affords the user protection for electronic compatibility EMC and product safety You can obtain the DoC for your product by visiting ni com certification If your product supports calibration you can obtain the calibration certificate for your product atni com calibration National Instruments corporate headquarters is located at 11500 North Mopac Expressway Austin Texas 78759 3504 National Instruments also has offices located around the world to help address your support needs For telephone support in the United States create your service request at ni com support and follow the calling instructions or dial 512 795 8248 For telephone support outside the United States contact your local branch office Australia 1800 300 800 Austria 43 0 662 45 79 90 0 Belgium 32 0 2 757 00 20 Brazil 55 11 3262 3599 Canada Calgary 403 274 9391 C
9. 08 6009 can perform both single and multiple A D conversions of a fixed or infinite number of samples A first in first out FIFO buffer holds data during Al acquisitions to ensure that no data is lost Analog Input Modes You can configure the AI channels on the USB 6008 6009 to take single ended or differential measurements Refer to Table 3 for more information about I O connections for single ended or differential measurements Connecting Differential Voltage Signals For differential signals connect the positive lead of the signal to the AI terminal and the negative lead to the AI terminal Al ELM pecie Voltage e USB 6008 6009 Source _ i A Figure 7 Connecting a Differential Voltage Signal The differential input mode can measure 20 V signals in the 20 V range However the maximum voltage on any one pin is 10 V with respect to GND For example if AI 1 is 10 V and AI 5 is 10 V then the measurement returned from the device is 20 V USB 6008 6009 User Guide 12 ni com S e lt Al 1 2 e e o o 2 Al5 Du a Result Yv Figure 8 Example of a Differential 20 V Measurement Connecting a signal greater than 10 V on either pin results in a clipped output s e e AI 1 9 3 Als nn a E Result Yv Figure 9 Exceeding 10 V on Al Returns Clipped Output Connecting Reference Single Ended Voltage Signals To connect reference single ended vol
10. A USER GUIDE USB 6008 6009 This user guide describes how to use the National Instruments USB 6008 6009 data acquisition DAQ devices Contents Introduction is seems rete ie te e rie ie tr rte 2 Safety Guidelines a e RR dd epe ce teur 3 Nn P i 5 Logging Application ectetuer eee AE 5 Self TEST tente 5 Hardware entend ciy 6 Setting Up Hardwate eee rte pte 7 VO CODBeCtOF iere ra pete tette Rates 8 Signal Descriptions ern eire re cete bore e e 10 Analog Input cae 11 Analog Input Circuitry encocronocnciocenconisorentcan cin eter teret teda 11 MUX A 11 A lite le tre E REER sonde pas ns A 11 AD ConVerter ss shine ennemies 11 ATPIEQ aate rar P iris 12 Analog Input Modes essere rennen 12 Connecting Differential Voltage Signals 12 Connecting Reference Single Ended Voltage Signals 13 Digital Trinidad 14 Analog OUtpUt s e lr ees 14 Analog Output Circuitry ss 14 DAS H 14 Connecting Analog Output Loads ooonconccocinonconononconnnnonncnanonnonononos 15 Minimizing Glitches on the Output Signal 15 Digital TQ iiia irte ce eroe PE Pre E rre rns 15 Digital YO CCU Vins 15 Source Sink Information 16 VO Protection Em 17 Power On States onic scacesesedsas eie tree i eee A 18 Static DIO cuanta 18 Y
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12. e 14 bits differential 13 bits single ended 1 Max sampling rate USB 6008 48 kS s USB6009 5 reete ters 10 kS s ATBIFO eer teens 512 bytes Timing resolution 41 67 ns 24 MHz timebase Timing accuracy 100 ppm of actual sample rate Input range Single ended sss 10 V Differential 20 V 10 V 5 V 4 V 2 5 V 2 V 1 25 V 1 V Working voltage 10 V Input impedance 144 KQ Overvoltage protection 35 Might be system dependent National Instruments Corporation 19 USB 6008 6009 User Guide Trigger source Software or external digital trigger System NOISE rete 0 3 LSBrms 10 V range Absolute accuracy at full scale single ended Typical at 25 C Maximum over Temperature Range mV mV 10 14 7 138 Absolute accuracy at full scale differential Typical at 25 C Maximum over Temperature Range mV mV 20 14 7 138 10 7 73 84 8 5 4 28 58 4 4 3 59 53 1 12 5 2 56 45 1 2 2 21 42 5 1 25 1 70 38 9 l 1 53 37 5 1 Input voltages may not exceed the working voltage range Analog Output USB 6008 6009 User Guide Converter type coooococcnocconcconcnnconncnnncnonanono Successive approximation Analog outputs 2 Output resolution 12 bits Maximum update rate 150 Hz softwa
13. e Terminal Signal 17 P0 0 18 P0 1 19 P0 2 20 P0 3 21 P0 4 eo a 22 P0 5 c N 23 PO 6 N S e 24 P0 7 N 25 P1 0 LO N 9 26 P1 1 N bi 27 P1 2 N c EN 28 P1 3 e e e 29 PFI 0 N e 30 2 5 V 31 5 V 32 GND National Instruments Corporation USB 6008 6009 User Guide Signal Descriptions Table 3 describes the signals available on the I O connectors Table 3 Signal Descriptions Signal Name Reference Direction Description GND Ground The reference point for the single ended AI measurements bias current return point for differential mode measurements AO voltages digital signals at the I O connector 5 VDC supply and the 42 5 VDC reference AI lt 0 7 gt Varies Input Analog Input Channels 0 to 7 For single ended measurements each signal is an analog input voltage channel For differential measurements AI 0 and AI 4 are the positive and negative inputs of differential analog input channel 0 The following signal pairs also form differential input channels AI 1 AI 5 AI2 AI 6 gt and lt AI 3 AI 75 AO 0 AO 1 GND Output Analog Channel 0 Output Supplies the voltage output of AO channel 0 GND Output Analog Channel 1 Output Supplies the voltage output of AO channel 1 P1 lt 0 3 gt P0 lt 0 7 gt GND Input or Output Digital VO Signals You can individually configure each signal as an input or output
14. e for your pull up resistor that is greater than or equal to the ideal resistance Re connect the load circuit and the pull up resistor To protect the USB 6008 6009 against overvoltage undervoltage and overcurrent conditions as well as ESD events you should avoid these fault conditions by using the following guidelines National Instruments Corporation If you configure a DIO line as an output do not connect it to any external signal source ground signal or power supply If you configure a DIO line as an output understand the current requirements of the load connected to these signals Do not exceed the specified current output limits of the DAQ device 17 USB 6008 6009 User Guide Power On States Static DIO Event Counter National Instruments has several signal conditioning solutions for digital applications requiring high current drive e Ifyou configure a DIO line as an input do not drive the line with voltages outside of its normal operating range The DIO lines have a smaller operating range than the Al signals e Treat the DAQ device as you would treat any static sensitive device Always properly ground yourself and the equipment when handling the DAQ device or connecting to it At system startup and reset the hardware sets all DIO lines to high impedance inputs The DAQ device does not drive the signal high or low Each line has a weak pull up resistor connected to it Each of the USB 6008 6009 DIO l
15. e levels that commonly occur in electrical distribution systems The following is a description of measurement categories e Measurement Category I is for measurements performed on circuits not directly connected to the electrical distribution system referred to as MAINS voltage This category is for measurements of voltages from specially protected secondary circuits Such voltage measurements include signal levels special equipment limited energy parts of equipment circuits powered by regulated low voltage sources and electronics Measurement Category as defined in electrical safety standard IEC 61010 1 Measurement Category is also referred to as Installation Category Working Voltage is the highest rms value of an AC or DC voltage that can occur across any particular insulation 5 MAINS is defined as a hazardous live electrical supply system that powers equipment Suitably rated measuring circuits may be connected to the MAINS for measuring purposes USB 6008 6009 User Guide 4 ni com Software Measurement Category II is for measurements performed on circuits directly connected to the electrical distribution system This category refers to local level electrical distribution such as that provided by a standard wall outlet for example 115 V for U S or 230 V for Europe Examples of Measurement Category II are measurements performed on household appliances portable tools and similar E Series devices Measurement Category
16. e screw terminal blocks you must only insert them into the matching combicon jack as indicated by the overlay label on the USB 6008 6009 device 3 Connect the wiring to the appropriate screw terminals National Instruments Corporation 7 USB 6008 6009 User Guide 1 0 Connector The USB 6008 6009 ships with one detachable screw terminal block for analog signals and one detachable screw terminal block for digital signals These terminal blocks provide 16 connections that use 16 AWG to 28 AWG wire Table 1 lists the analog terminal assignments and Table 2 lists the digital terminal assignments Table 1 Analog Terminal Assignments Signal Signal Module Terminal Single Ended Mode Differential Mode 1 GND GND ss 2 ATO AI 0 B 3 AI 4 AI 0 4 GND GND 5 AII AI 1 N as 6 AI5 AI 1 a g GND GND c e 8 AI2 AI 2 l co 9 AI6 AI2 co 10 GND GND e m 11 AI3 AI 3 N e 12 AIT AI3 a 13 GND GND 2 14 AO 0 AO 0 15 AO 1 AO 1 16 GND GND USB 6008 6009 User Guide ni com Table 2 Digital Terminal Assignments Modul
17. es on the Output Signal When you use a DAC to generate a waveform you may observe glitches in the output signal These glitches are normal when a DAQ switches from one voltage to another it produces glitches due to released charges The largest glitches occur when the most significant bit of the DAC code changes You can build a low pass deglitching filter to remove some of these glitches depending on the frequency and nature of the output signal Refer to ni com support for more information about minimizing glitches Digital 1 0 The USB 6008 6009 has 12 digital lines PO lt 0 7 gt and P1 lt 0 3 gt which comprise the DIO port GND is the ground reference signal for the DIO port You can individually program all lines as inputs or outputs Digital 1 0 Circuitry Figure 13 shows P0 lt 0 7 gt connected to example signals configured as digital inputs and digital outputs You can configure P1 lt 0 3 gt similarly O National Instruments Corporation 15 USB 6008 6009 User Guide PO 0 PO 1 ww P0 2 QT PO 4 PO 5 P0 6 P0 7 Switch 1 0 Connector P0 0 configured as an open drain digital output driving a LED P0 2 configured as a push pull digital output driving a LED P0 4 configured as a digital input receiving a TTL signal from a gated invertor P0 7 configured as a digital input receiving a O V or 5 V signal from a switch RON Figure 13 Example of Co
18. inals 0 22 to 0 25 N m 2 0 to 2 2 Ib in Safety Standards The USB 6008 6009 is designed to meet the requirements of the following standards of safety for electrical equipment for measurement control and laboratory use e TEC 61010 1 EN 61010 1 e UL 61010 1 e CAN CSA C22 2 No 61010 1 iyi Note For UL and other safety certifications refer to the product label or visit ni com certification search by model number or product line and click the appropriate link in the Certification column Voltages Connect only voltages that are within these limits Channel to GND eese 30 V max Measurement Category I Measurement Category I is for measurements performed on circuits not directly connected to the electrical distribution system referred to as MAINS voltage MAINS is a hazardous live electrical supply system that powers equipment This category is for measurements of voltages from specially protected secondary circuits Such voltage measurements include signal levels special equipment limited energy parts of equipment circuits powered by regulated low voltage sources and electronics A Caution Do not use this module for connection to signals or for measurements within Measurement Categories II III or IV O National Instruments Corporation 23 USB 6008 6009 User Guide Hazardous Locations The USB 6008 6009 are not certified for use in hazardous locations Environmental
19. ines can be used as a static DI or DO line You can use static DIO lines to monitor or control digital signals All samples of static DI lines and updates of DO lines are software timed You can configure PFI 0 as a source for a gated invertor counter input edge count task In this mode falling edge events are counted using a 32 bit counter For more information about event timing requirements refer to the Specifications section Reference and Power Sources The USB 6008 6000 creates an external reference and supplies a power source 2 5 External References USB 6008 6009 User Guide The USB 6008 6009 creates a high purity reference voltage supply for the ADC using a multi state regulator amplifier and filter circuit The resulting 2 5 V reference voltage can be used as a signal for self test Refer to the Self Test section for more information 18 ni com 5 V Power Source The USB 6008 6009 supplies a 5 V 200 mA output This source can be used to power external components iyi Note While the device is in USB suspend the output is disabled Specifications The following specifications are typical at 25 C unless otherwise noted Analog Input Converter type Successive approximation Analog inputs esee 8 single ended 4 differential software selectable Input resolution USB 6008 12 bits differential 11 bits single ended USB 6009 ees
20. nnecting a Load A Caution Exceeding the maximum input voltage ratings or maximum output ratings which are listed in the specifications can damage the DAQ device and the computer National Instruments is not liable for any damage resulting from such signal connections Source Sink Information The default configuration of the USB 6008 6009 DIO ports is open drain allowing 5 V operation with an onboard 4 7 kQ pull up resistor An external user provided pull up resistor can be added to increase the source current drive up to a 8 5 mA limit per line as shown in Figure 14 USB 6008 6009 User Guide 16 ni com USB 6008 6009 RI Load E 45V eth V Re E Rp External 4 7 KQ Onboard Resistor Pull up ou sd P0 0 ort Pa Resistor 4 Dx A 9 GND 1 0 Protection Figure 14 Example of Connecting External User Provided Resistor Complete the following steps to determine the value of the user provided pull up resistor 1 2 3 Place an ammeter in series with the load Place a variable resistor between the digital output line and the 5 V Adjust the variable resistor until the ammeter current reads as the intended current The intended current must be less than 8 5 mA Remove the ammeter and variable resistor from your circuit Measure the resistance of the variable resistor The measured resistance is the ideal value of the pull up resistor Select a static resistor valu
21. re returning it to service Operate the device only at or below Pollution Degree 2 Pollution is foreign matter in a solid liquid or gaseous state that can reduce dielectric strength or surface resistivity The following is a description of pollution degrees e Pollution Degree 1 means no pollution or only dry nonconductive pollution occurs The pollution has no influence e Pollution Degree 2 means that only nonconductive pollution occurs in most cases Occasionally however a temporary conductivity caused by condensation must be expected e Pollution Degree 3 means that conductive pollution occurs or dry nonconductive pollution occurs that becomes conductive due to condensation You must insulate signal connections for the maximum voltage for which the device is rated Do not exceed the maximum ratings for the device Do not install wiring while the device is live with electrical signals Do not remove or add connector blocks when power is connected to the system Avoid contact between your body and the connector block signal when hot swapping modules Remove power from signal lines before connecting them to or disconnecting them from the device Operate the device at or below the Measurement Category I Measurement circuits are subjected to working voltages and transient stresses overvoltage from the circuit to which they are connected during measurement or test Measurement categories establish standard impulse withstand voltag
22. re timed Output range eseina 0 to 5 V Output impedance sss 500 Output current drive 5mA Power on state OV 20 ni com Slew Pate ini eee eom 1 V us Short circuit current s es 50 mA Absolute accuracy no load 7 mV typical 36 4 mV maximum at Full Scale Digital 1 0 Digital I O POSO T 8 lines PROB A ene 4 lines Direction control ssss Each channel individually programmable as input or output Output driver type USB 6008 sinenion Open drain USB z60009 2 nates Each channel individually programmable as push pull or open drain Compatibility eee TTL LVTTL CMOS Absolute maximum voltage range 0 5 to 5 8 V with respect to GND Pull up resistor esee 4 7 KQ to 5 V Power on state Input high impedance Digital logic levels Level Min Max Units Input low voltage 0 3 0 8 V Input high voltage 2 0 5 8 V Input leakage current 50 HA Output low voltage I 8 5 mA 0 8 V Output high voltage Push pull I 8 5mA 2 0 3 5 V Open drain I 0 6mA nominal 2 0 5 0 V Open drain I 8 5mA with external pull up resistor 2 0 V External Voltage 5 V output 200 mA maximum 5 V typical 4 85 V minimum 2 5 V output 1 mA maximum 2 5 V typical O National Instruments Corporation 21 USB 6008 6009 User Guide
23. tage signals RSE to the USB 6008 6009 connect the positive voltage signal to the desired AI terminal and the ground signal to a GND terminal National Instruments Corporation 13 USB 6008 6009 User Guide Al A HH Voltage C USB 6008 6009 Source _ i GND 0 Figure 10 Connecting a Differential Voltage Signal Digital Trigger When an AI task is defined you can configure PFI 0 as a digital trigger input When the digital trigger is enabled the AI task waits for a rising edge on PFI 0 before starting the acquisition To use ai Start Trigger with a digital source specify PFI O as the source and select rising edge Analog Output The USB 6008 6009 has two independent AO channels that can generate outputs from 0 5 V All updates of AO lines are software timed Analog Output Circuitry Figure 11 illustrates the analog output circuitry for the USB 6008 6009 45V REF REF 12 Bit DAC Output Buffer AO Figure 11 Analog Output Circuitry DACs Digital to analog converts DACs convert digital codes to analog voltages USB 6008 6009 User Guide 14 ni com Connecting Analog Output Loads To connect loads to the USB 6008 6009 connect the positive lead of the load to the AO terminal and connect the ground of the load to a GND terminal Load USB 6008 6009 i Figure 12 Connecting a Load Minimizing Glitch
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