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National Instruments NI USB-6008, User Manual

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National Instruments NI USB-6008 User Manual Download Page 18

NI USB-6008/6009 User Guide and Specifications

18

ni.com

AI FIFO

The NI USB-6008/6009 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 AI acquisitions to ensure that no data 
is lost.

Analog Input Modes

You can configure the AI channels on the NI USB-6008/6009 to take 
single-ended or differential measurements. Refer to Table 6 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.

Figure 8.  

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.

AI+

NI U

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B-6008/6009

AI–

Volt

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S

ource

Summary of Contents for NI USB-6008

Page 1: ...g input AI channels two analog output AO channels 12 digital input output DIO channels and a 32 bit counter with a Full Speed USB interface Note This manual revision updates naming conventions to reflect the conventions used in NI DAQmx Table 1 notes the correlation between the old and updated names Table 1 Digital Output Driver Type Naming Conventions Hardware Functionality NI DAQmx Terminology O...

Page 2: ...I USB 6009 AI Resolution 12 bits differential 11 bits single ended 14 bits differential 13 bits single ended Maximum AI Sample Rate Single Channel 10 kS s 48 kS s Maximum AI Sample Rate Multiple Channels Aggregate 10 kS s 48 kS s DIO Configuration Open collector Open collector or active drive System dependent 1 USB Cable Strain Relief NI USB 6009 8 Inputs 14 bit Multifunction I O 32 Digital 17 1 A...

Page 3: ...B 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 accessorie...

Page 4: ...nector 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 I1 Measurement circuits are subjected to working voltages2 and transient stresses overvoltage from the circu...

Page 5: ... V Examples include electricity meters and measurements on primary overcurrent protection devices and on ripple control units Related Documentation Each application software package and driver includes information about writing applications for taking measurements and controlling measurement devices The following references to documents assume you have NI DAQmx 8 7 or later and where applicable ve...

Page 6: ...LabVIEW using the DAQ Assistant VI and Function Reference Measurement I O VIs and Functions Describes the LabVIEW NI DAQmx VIs and properties Taking Measurements Contains the conceptual and how to information you need to acquire and analyze measurement data in LabVIEW including common measurements measurement fundamentals NI DAQmx key concepts and device considerations LabWindows CVI The Data Acqu...

Page 7: ...roject type You add DAQ tasks as a part of this step ANSI C without NI Application Software The NI DAQmx Help contains API overviews and general information about measurement concepts Select Start All Programs National Instruments NI DAQ NI DAQmx Help The NI DAQmx C Reference Help describes the NI DAQmx Library functions which you can use with National Instruments data acquisition devices to devel...

Page 8: ...e You can also download these documents at ni com manuals NI DAQmx Base Linux Mac OS X LabVIEW PDA 8 x The NI DAQmx Base Getting Started Guide describes how to install your NI DAQmx Base software your NI DAQmx Base supported DAQ device and how to confirm that your device is operating properly In Windows select Start All Programs National Instruments NI DAQmx Base Documentation Getting Started Guid...

Page 9: ... DAQmx users step by step instructions for installing software and hardware configuring channels and tasks and getting started developing an application Note For information about non Windows operating system support refer to ni com info and enter BaseGSGML Installing Other Software If you are using other software refer to the installation instructions that accompany your software Example Programs...

Page 10: ... use with the device Refer to the Installing the Software section of this guide and the documentation included with the software for more information Figure 4 shows key functional components of the NI USB 6008 6009 Figure 4 Device Block Diagram P1 0 3 P0 0 7 Digital I O Terminal Block AI 0 7 AO 0 AO 1 Analog I O Terminal Block 2 5 V CAL 5 V 200 mA 8 Channel 12 14b ADC 12b DAC 12b DAC USB Microcont...

Page 11: ...u can apply the signal labels to the screw terminal blocks for easy signal identification Figure 5 NI USB 6008 6009 Signal Labels 3 Refer to Table 4 and Figures 5 and 6 for signal 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 1 Terminal Number Labels ...

Page 12: ...hem into the matching combicon jack as indicated by the overlay label on the NI USB 6008 6009 device 4 Connect the wiring to the appropriate screw terminals 1 Overlay Label with Pin Orientation Guides 2 Combicon Jack 3 Signal Labels 4 USB Cable 9 0 0 6 B S U I N O I n o i t c n u f i t l u M t i b 4 1 s t u p n I 8 2 3 l a t i g i D 7 1 1 g o l a n A 6 1 3 2 4 1 2 3 ...

Page 13: ...LED blinks steadily to indicate that the device is initialized and is receiving power from the connection If the LED is not blinking it may mean that the device is not initialized or the computer is in standby mode In order for the device to be recognized the device must be connected to a computer that has NI DAQmx installed on it If your device is not blinking make sure your computer has the late...

Page 14: ...ions that use 16 AWG to 28 AWG wire Table 4 lists the analog terminal assignments and Table 5 lists the digital terminal assignments Table 4 Analog Terminal Assignments Module Terminal Signal Single Ended Mode Signal Differential Mode 1 GND GND 2 AI 0 AI 0 3 AI 4 AI 0 4 GND GND 5 AI 1 AI 1 6 AI 5 AI 1 7 GND GND 8 AI 2 AI 2 9 AI 6 AI 2 10 GND GND 11 AI 3 AI 3 12 AI 7 AI 3 13 GND GND 14 AO 0 AO 0 15...

Page 15: ...Guide and Specifications Table 5 Digital Terminal Assignments Module Terminal Signal 17 P0 0 18 P0 1 19 P0 2 20 P0 3 21 P0 4 22 P0 5 23 P0 6 24 P0 7 25 P1 0 26 P1 1 27 P1 2 28 P1 3 29 PFI 0 30 2 5 V 31 5 V 32 GND 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 ...

Page 16: ...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 AI 2 AI 6 and AI 3 AI 7 AO 0 GND Output Analog Channel 0 Output Supplies the voltage output of AO channel 0 AO 1 GND Output Analog Channel 1 Output Supplies the voltage output of AO channel 1 P1 0 3 P0 0 7...

Page 17: ... 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 applicat...

Page 18: ...nts Refer to Table 6 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 Figure 8 Connecting a Differential Voltage Signal The differential input mode can measure 20 V signals in the 20 V range Howe...

Page 19: ...age signals RSE to the NI USB 6008 6009 connect the positive voltage signal to the desired AI terminal and the ground signal to a GND terminal as illustrated in Figure 11 When no signals are connected to the analog input terminal the internal resistor divider may cause the terminal to float to approximately 1 4 V when the analog input terminal is configured as RSE This behavior is normal and does ...

Page 20: ...efore starting the acquisition To use ai Start Trigger with a digital source specify PFI 0 as the source and select rising or falling edge Analog Output The NI 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 12 illustrates the analog output circuitry for the NI USB 6008 6009 Figure 12 Analo...

Page 21: ...itches 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 lowpass 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 info...

Page 22: ...ration with an onboard 4 7 kΩ 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 15 The NI USB 6009 ports can also be configured as active drive using the NI DAQmx API allowing 3 3 V operation with a source sink current limit of 8 5 mA Refer to the NI DAQmx Help for more information about ho...

Page 23: ...riable resistor until the ammeter current reads as the intended current The intended current must be less than 8 5 mA 4 Remove the ammeter and variable resistor from your circuit 5 Measure the resistance of the variable resistor The measured resistance is the ideal value of the pull up resistor 6 Select a static resistor value for your pull up resistor that is greater than or equal to the ideal re...

Page 24: ...side of its normal operating range The DIO lines have a smaller operating range than the AI signals 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 Power On States At system startup and reset the hardware sets all DIO lines to high impedance inputs The DAQ device does not drive th...

Page 25: ...or self test 5 V Power Source The NI USB 6008 6009 supplies a 5 V 200 mA output This source can be used to power external components 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 8 single ended 4 differential software selectable ...

Page 26: ...20 V range 5 mVrms 1 V range 0 5 mVrms Absolute accuracy at full scale single ended Absolute accuracy at full scale differential3 1 20 V means that AI AI 20 V However AI and AI must both be within 10 V of GND Refer to the Connecting Differential Voltage Signals for more information 2 System noise measured at maximum sample rate Range Typical at 25 C mV Maximum over Temperature mV 10 14 7 138 3 Inp...

Page 27: ...V μs Short circuit current 50 mA Absolute accuracy no load 7 mV typical 36 4 mV maximum at full scale Digital I O Digital I O P0 0 7 8 lines P1 0 3 4 lines Direction control Each channel individually programmable as input or output Output driver type NI USB 6008 Open collector open drain NI USB 6009 Each channel individually programmable as active drive push pull or open collector open drain 2 2 2...

Page 28: ...mperature drift 50 ppm C max Counter Number of counters 1 Resolution 32 bits Counter measurements Edge counting falling edge Counter direction Count up Pull up resistor 4 7 kΩ to 5 V Maximum input frequency 5 MHz Minimum high pulse width 100 ns Level Min Max Units Input low voltage Input high voltage Input leakage current 0 3 2 0 0 8 5 8 50 V V μA Output low voltage I 8 5 mA Output high voltage Ac...

Page 29: ...25 VDC 80 mA typical 500 mA max USB suspend 300 μA typical 500 μA max Physical Characteristics Dimensions Without connectors 6 35 cm 8 51 cm 2 31 cm 2 50 in 3 35 in 0 91 in With connectors 8 18 cm 8 51 cm 2 31 cm 3 22 in 3 35 in 0 91 in I O connectors USB series B receptacle 2 16 position terminal block plug headers Weight With connectors 84 g 3 oz Without connectors 54 g 1 9 oz Screw terminal wir...

Page 30: ...by regulated low voltage sources and electronics Caution Do not use this module for connection to signals or for measurements within Measurement Categories II III or IV Safety Standards This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement control and laboratory use IEC 61010 1 EN 61010 1 UL 61010 1 CSA 61010 1 Note For UL a...

Page 31: ...s amended for CE marking as follows 2006 95 EC Low Voltage Directive safety 2004 108 EC Electromagnetic Compatibility Directive EMC 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 module number or product line and click the appropriate link in the Certificat...

Page 32: ...stin 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 43 662 457990 0 Belgiu...

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