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USER GUIDE AND SPECIFICATIONS
NI USB-9234
4-Channel, ±5 V, 24-Bit Software-Selectable IEPE and AC/DC
Analog Input Module
Introduction
This user guide describes how to use the National Instruments USB-9234
and includes device specifications and connector assignments.
The NI USB-9234 consists of two components: an NI 9234 module and an
NI USB-9162 carrier, as shown in Figure 1.
NI 9234
NI USB-9162
Figure 1. NI USB-9234 Components
NI USB-9234
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Table of Contents
Related Manuals for National Instruments NI USB-9234
Summary of Contents for National Instruments NI USB-9234
- Page 1 This user guide describes how to use the National Instruments USB-9234 and includes device specifications and connector assignments. Introduction The NI USB-9234 consists of two components: an NI 9234 module and an NI USB-9162 carrier, as shown in Figure 1. NI 9234 NI USB-9162 Figure 1.
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Page 2: Safety Guidelines
Note Although the NI 9234 module may have more stringent certification standards than the NI USB-9234, when used with the NI USB-9162 carrier, the combined system may be limited. Refer to the This icon denotes that the component may be hot. Touching this component Hot Surface may result in bodily injury. -
Page 3: Safety Guidelines For Hazardous Voltages
NI-DAQmx. Select Start»All Programs»National Instruments» NI-DAQ»NI-DAQ Readme. The NI-DAQmx Help contains general information about measurement concepts, key NI-DAQmx concepts, and common applications that are applicable to all programming environments. Select Start»All Programs»National Instruments»NI-DAQ»NI-DAQmx Help. © National Instruments Corporation NI USB-9234 User Guide and Specifications... - Page 4 The NI-DAQmx Library book of the LabWindows/CVI Help contains API overviews and function reference for NI-DAQmx. Select Library Reference»NI-DAQmx Library in the LabWindows/CVI Help. NI USB-9234 User Guide and Specifications directory and opening Getting Started»Getting Started with DAQ—Includes overview information and a tutorial to learn how to take an NI-DAQmx measurement in LabVIEW using the DAQ Assistant.
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Page 5: Measurement Studio
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 develop instrumentation, acquisition, and control applications. Select Start»All Programs»National Instruments»NI-DAQ» NI-DAQmx C Reference Help. -
Page 6: Device Documentation And Specifications
If you need more help getting started developing an application with NI products, NI offers training courses. To enroll in a course or obtain a detailed course outline, refer to Technical Support on the Web For additional support, refer to NI USB-9234 User Guide and Specifications ni.com/manuals ni.com/training ni.com/support zone.ni.com... -
Page 7: Installing The Software
Example Programs The NI-DAQmx CD contains example programs that you can use to get started programming with the NI USB-9234. Refer to the NI-DAQmx for USB Devices Getting Started Guide that shipped with your device, which is also accessible from Start»All Programs»National Instruments»... - Page 8 NI USB-9234 User Guide and Specifications Align the I/O module with the carrier, as shown in Figure 3. Figure 3. Module Installation Squeeze the latches and insert the NI 9234 module into the NI USB-9162 carrier. Press firmly on the connector side of the NI 9234 module until the latches lock the module into place, as shown in Figure 4.
- Page 9 Refer to Figure 5 for the module dimensions. Connecting the NI USB-9234 to a Computer Plug one end of the USB cable into the NI USB-9234 and the other end into an available USB port on the computer. Refer to the NI-DAQmx for USB Devices Getting Started Guide that shipped with your device, which is also accessible from Start»All Programs»National Instruments»NI-DAQ,...
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Page 10: Led Indicator
LED Indicator The NI USB-9234 device has a green LED next to the USB connector. The LED indicator indicates device status, as listed in Table 1. When the device is connected to a USB port, the LED blinks steadily to indicate that the device is initialized and is receiving power from the connection. - Page 11 Wiring the NI USB-9234 The NI USB-9234 has four BNC connectors that provide connections to four simultaneously sampled analog input channels. Each channel has a BNC connector to which you can connect a signal source. You can also enable excitation current on a per-channel basis to connect Integrated Electronic Piezoelectric (IEPE) sensors.
- Page 12 BNC connectors from touching each other, the modules, or the chassis. If you make a ground-referenced connection between the signal source and the NI USB-9234, make sure the voltage on the AI– shell is in the common-mode range to ensure proper operation of the NI USB-9234. The AI–...
- Page 13 50 Ω resistor. To minimize ground noise, make sure that the chassis ground is connected to earth ground. Each channel is protected from overvoltages. You can configure the NI USB-9234 for AC or DC coupling for each channel. You can turn the IEPE excitation current on or off in AC-coupled mode (in software).
- Page 14 The signals within the passband have frequency-dependent gain or attenuation. The small amount of variation in gain with frequency is called the passband flatness. The digital filters of the NI USB-9234 adjust the frequency range of the passband to match the data rate. Therefore, the amount of gain or attenuation at a given frequency depends on the data rate.
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Page 15: Alias-Free Bandwidth
Alias-Free Bandwidth Any signal that appears in the alias-free bandwidth of the NI USB-9234 is not an aliased artifact of signals at a higher frequency. The alias-free bandwidth is defined by the ability of the filter to reject frequencies above the stopband frequency, and it is equal to the data rate minus the stopband frequency. -
Page 16: Specifications
Data rate range (f Data rate range (f Data rates (f Input coupling...AC/DC (software-selectable) AC cutoff frequency NI USB-9234 User Guide and Specifications Frequency ...13.1072 MHz Accuracy...±50 ppm max ) using internal master timebase Minimum ...1.652 kS/s Maximum ...51.2 kS/s ) using external master timebase Minimum ...0.391 kS/s... - Page 17 NI USB-9234, is the bias voltage of the IEPE sensor, bias is the full-scale voltage of IEPE sensor full-scale must be 0 to 19 full scale – NI USB-9234 User Guide and Specifications...
- Page 18 Offset drift Channel-to-channel matching Passband Refer to the NI USB-9234 Circuitry NI USB-9234 User Guide and Specifications For a signal source connected to AI+ and AI– ...±30 V For a low-impedance source connected to AI+ and AI– ...–6 to 30 V...
- Page 19 CCIF 11 kHz/12 kHz 1:1 amplitude ratio ... –93 dB 25.6 kS/s 2.048 kS/s 99 dBFS 103 dBFS 40 μV 25 μV 350 nV/√Hz 780 nV/√Hz 8 kHz, –40 to 70 °C –87 dB –80 dB NI USB-9234 User Guide and Specifications...
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Page 20: Power Requirements
Such voltage measurements include signal levels, special equipment, limited-energy parts of equipment, circuits powered by regulated low-voltage sources, and electronics. Do not connect the NI USB-9234 to signals or use for measurements within Caution Measurement Categories II, III, or IV. -
Page 21: Safety Standards
, search by model number or product line, and click the appropriate link certification in the Certification column. Hazardous Locations The NI USB-9234 is not certified for use in hazardous locations. Environmental The NI USB-9234 device is intended for indoor use only. Operating temperature... 0 to 60 °C Storage temperature ... -
Page 22: Environmental Management
Waste Electrical and Electronic Equipment (WEEE) EU Customers At the end of their life cycle, all products must be sent to a WEEE recycling center. For more information about WEEE recycling centers and National Instruments WEEE initiatives, visit National Instruments... -
Page 23: Where To Go For Support
Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your CD, or ni.com/patents.