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National Instruments NI USB-9234 manual

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  • Page 1

    USER GUIDE AND SPECIFICATIONS NI USB-9234 4-Channel, ±5 V , 24-Bit Softwar e-Selectable IEPE and AC/DC Analog Input Module This user guide describes how to use the National Instruments USB-9234 and includes device specifications and co nnector assignments. Introduction The NI USB-9234 consists of two compo nents: an NI 9234 mo dule and an NI USB-9[...]

  • Page 2

    NI USB-9234 U ser Guide and Specifications 2 ni.com Dimensions Figure 2 shows the NI USB-9234 device dim ensions. Figure 2. NI USB-9234 Device in Millimeters (Inches) Safety Guidelines Operate the NI USB-9234 only as described in this user guide. Note Although the NI 9234 module may have more stringent certification standards than the NI USB-9234, [...]

  • Page 3

    © National Instruments Corporation 3 NI USB-9234 User Guid e and Specifications Safety Guidelines for Hazardous Vo ltages If hazardous voltages are connected to the module, take the following precautions. A hazardous vo ltage is a voltage greater than 42.4 V pk or 60 VDC to earth ground. Caution Ensure that hazardous v oltage wiring is performed o[...]

  • Page 4

    NI USB-9234 U ser Guide and Specifications 4 ni.com LabVIEW If you are a new user, use the Getting Started with LabVIEW manual to familiarize yourself with the LabVIEW graphical programming environment and the basic LabVIEW features you use to build data acquisition and instrum ent control applications. Op en the Getting Started with LabVIEW manual[...]

  • Page 5

    © National Instruments Corporation 5 NI USB-9234 User Guid e and Specifications Measurement Studio If you program your NI-D A Qmx-su pported device in Measurement Studio using V isual C++, V isual C#, or V isu al Basic .NET , you can interactively create channels and tasks by launching the D A Q Assistant from MAX or from within V isual Studio .NE[...]

  • Page 6

    NI USB-9234 U ser Guide and Specifications 6 ni.com .NET Languages without NI Application Software W ith the Microsoft .NET Framework v ersion 1.1 or later , you can use NI-D A Qmx to create applications us ing V isual C# and V isual Basic .NET without Measurement Studi o. Y ou need Microsoft V isual Studio .NET 2003 or Microsoft V isual Studio 200[...]

  • Page 7

    © National Instruments Corporation 7 NI USB-9234 User Guid e and Specifications Installing the Software Software support for the NI USB-92 34 for Windows Vist a/XP/2000 is provided by NI-DAQmx. The DAQ Getting S tarted Guide , which you can download at ni.com/manuals , offers NI-DAQmx users st ep-by-step instructions for installing software and ha[...]

  • Page 8

    NI USB-9234 U ser Guide and Specifications 8 ni.com 3. Align the I/O module with the carrier , as sho wn in Figure 3. Figure 3. Module Installation 4. Squeeze the latches and insert the NI 9234 module into the NI USB-9162 carrier . 5. Press f irmly on the connecto r side of the NI 9234 module until the latches lock the module into place, as sho wn [...]

  • Page 9

    © National Instruments Corporation 9 NI USB-9234 User Guid e and Specifications Mounting the NI USB-9234 Threaded inserts are located in the NI USB-9234 for mounting it to a panel. Refer to Figure 5 for the module dimensio ns. Figure 5. Module Dimensions Connecting the NI USB-9234 to a Computer Plug one end of the USB cable into the NI USB-9234 an[...]

  • Page 10

    NI USB-9234 U ser Guide and Specifications 10 ni.com LED Indicator The NI USB-9234 device has a green LED next to the USB connector. The LED indicator indicates device stat us, as listed in Table 1. When the device is connected to a USB port, t he LED blinks steadily to indicate that the device is initialized and is r eceiving power from the connec[...]

  • Page 11

    © National Instruments Corporation 11 NI USB-9234 User Guid e and Specifications Wiring the NI USB-9234 The NI USB-9234 has four BNC connectors that provide connection s to four simultaneousl y sampled analog input channels. Each channel has a BNC connector to which you can conn ect a signal source. You can also enable excitation current on a per-[...]

  • Page 12

    NI USB-9234 U ser Guide and Specifications 12 ni.com Connecting Signal Sources to the NI USB-9234 You can connect ground-referenced or floating signal sensors to the NI USB-9234. To avoid picking up ground noi se, use a floating connection. To fu rther minimi ze ground noise, prevent th e metal shells of the BNC connectors from touching each ot her[...]

  • Page 13

    © National Instruments Corporation 13 NI USB-9234 User Guid e and Specifications NI USB-9234 Circuitr y The NI USB-9234 analog input channels are referenced to chassis groun d through a 50 Ω resistor. To minimize ground noise, m ake sure that the chassis ground is connected to earth ground. Each channel is protect ed from overvoltages. You can co[...]

  • Page 14

    NI USB-9234 U ser Guide and Specifications 14 ni.com The NI USB-9234 also has TEDS circuitry . F or more information about TEDS, go to ni.com/info and enter rdteds . Understanding NI USB-9234 Filtering The NI USB-9234 uses a combination of analog and digit al filtering to provide an accurate representation of i n-band signal s while rejecting out-o[...]

  • Page 15

    © National Instruments Corporation 15 NI USB-9234 User Guid e and Specifications Stopband The filter significantly attenuates all si gnals above the stopband frequency . The primary goal of the filter is to prevent aliasing. Th erefore, the stopband frequency scales precisely with the data rate. The sto pband rejection is the minimum amou nt of at[...]

  • Page 16

    NI USB-9234 U ser Guide and Specifications 16 ni.com Specifications The following specifications are ty pical for the range 0 to 60 °C unless otherwise noted. Input Characteristics Number of channels .............. ...... ............4 analog input channels ADC resolution ....... ................. ...............24 bits Type of ADC ...............[...]

  • Page 17

    © National Instruments Corporation 17 NI USB-9234 User Guid e and Specifications AC cutoff frequency response Input range .. ................. ................. ......... ±5 V AC voltage full-scale range Minimum ..... ................. .................. ±5 V pk Typical ............ .................... ............ ±5.1 V pk Maximum ..........[...]

  • Page 18

    NI USB-9234 U ser Guide and Specifications 18 ni.com Overvoltage protection (with respect to chassis ground) For a signal source connected to AI+ and AI– ............ ................ ....±30 V For a low-impedance sou rce connected to AI+ and AI– ...............– 6 to 30 V Input delay ....................... ................. ......3.2 ms + [...]

  • Page 19

    © National Instruments Corporation 19 NI USB-9234 User Guid e and Specifications Phase nonlinearity ( f s = 51.2 kS/s) ...... ................. ......... ±0.45° max Stopband Frequency................. ................ ....... 0.55 · f s Rejection .................... ................. .... 100 dB Alias-free bandwidth .................. ........[...]

  • Page 20

    NI USB-9234 U ser Guide and Specifications 20 ni.com Power Requirements Current consumption from USB ............ . 500 mA, max Suspend mode ................ ................. . 2.5 mA, max Bus Interface USB specifi cation ......... .................... ......USB 2.0 Hi-Speed Physical Characteristics Dimensions ......................... ...........[...]

  • Page 21

    © National Instruments Corporation 21 NI USB-9234 User Guid e and Specifications Safety Standards This product is designed to meet the requirements of the follow ing standards of safety for electrical e quipment for measurement, control, and laboratory use: • IEC 61010-1, EN-61010-1 • UL 61010-1, CSA 61010-1 Note For UL and other safety certif[...]

  • Page 22

    NI USB-9234 U ser Guide and Specifications 22 ni.com CE Compliance This product meets the essential re quirements of applicable European Directives, as amended fo r CE marking, as follows: • 2006/95/EC; Lo w-V oltage Directiv e (safety) • 2004/108/EC; Elect romagnetic Compatibility Directiv e (EMC) Note Refer to the Declaration of Conformity (D[...]

  • Page 23

    National Instruments, NI, ni.com, and LabVIEW are tradem arks of National Instruments Corporation. Refer to t he Terms of Use section on ni.com/legal for m ore inform ation about Natio nal Instruments trademarks. Other product and compan y names mentioned herein are trademarks or trade names of their respective companie s. For patents coveri ng Nat[...]