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USER GUIDE AND SPECIFICATIONS
NI USB-9237
4-Channel, 24-Bit Half/Full-Bridge Analog Input Device
Introduction
This user guide describes how to use the National Instruments USB-9237
and lists the device specifications. The NI USB-9237 provides a USB
interface for four channels of 24-bit half/full-bridge analog input.
The NI USB-9237 consists of two components: an NI 9237 module and an
NI USB-9162 carrier, as shown in Figure 1.
NI 9237
NI USB-9162
Figure 1. NI USB-9237 Components
NI USB-9237
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Related Manuals for National Instruments USB-9237
Summary of Contents for National Instruments USB-9237
- Page 1 The NI USB-9237 provides a USB interface for four channels of 24-bit half/full-bridge analog input. Introduction The NI USB-9237 consists of two components: an NI 9237 module and an NI USB-9162 carrier, as shown in Figure 1. NI 9237...
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Page 2: Safety Guidelines
Operate the NI USB-9237 only as described in these operating instructions. Although the NI 9237 module may have more stringent certification standards than Note the NI USB-9237, when used with the NI USB-9162 carrier, the combined system may be limited. Refer to the Specifications section for more details. -
Page 3: Related Documentation
NI-DAQmx measurement in LabVIEW using the DAQ Assistant. • VI and Function Reference»Measurement I/O VIs and Functions—Describes the LabVIEW NI-DAQmx VIs and properties. © National Instruments Corporation NI USB-9237 User Guide and Specifications... -
Page 4: Measurement Studio
In Visual Studio .NET, select File»New»Project to launch the New Project dialog box. Find the Measurement Studio folder for the language you want to create a program in. Choose a project type. You add DAQ tasks as a part of this step. NI USB-9237 User Guide and Specifications ni.com... -
Page 5: Ansi C Without Ni Application Software
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»NationalInstruments»NI-DAQ» NI-DAQmx C Reference Help. -
Page 6: Installing The Software
Example Programs The NI-DAQmx CD contains example programs that you can use to get started programming with the NI USB-9237. Refer to the NI-DAQmx for USB Devices Getting Started Guide that shipped with your device, and is also accessible from Start»All Programs»National Instruments»... - Page 7 Press firmly on the connector side of the NI 9237 module until the latches lock the module into place, as shown in Figure 4. Figure 4. Locking Module into Place © National Instruments Corporation NI USB-9237 User Guide and Specifications...
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Page 8: Led Indicator
Figure 5. Module Dimensions in Millimeters (Inches) Connecting the NI USB-9237 to a Computer Plug one end of the USB cable into the NI USB-9237 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, and is also accessible from Start»All Programs»National Instruments»NI-DAQ,... - Page 9 Table 2 lists the connections between an external excitation voltage source and the NI USB-9237. Note For a list of accessories available for use with the NI USB-9237, refer to , and enter info code ni.com/info rd9237 ©...
- Page 10 TEDS return* — Shunt calibration * These signals are shared by all four RJ-50 connectors on the NI USB-9237. Caution National Instruments does not recommend using an RJ-45 with the NI USB-9237 because it can physically damage pins 1 and 10 on the device, and thus permanently disable shunt calibration no matter what connector you use.
- Page 11 Figure 7. Half- and Full-Bridge Connections You can use a quarter bridge with the NI USB-9237 if you either add a resistor Note externally to create a half bridge or use the NI 9944 or NI 9945 Quarter Bridge Completion Accessory.
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Page 12: Remote Sensing
The NI USB-9237 includes remote sensing to compensate for this error. Remote sense wires are connected to the point where the excitation voltage wires connect to the bridge circuit. Figure 8 shows a diagram of how the NI USB-9237 uses remote sensing. RS + lead... -
Page 13: Shunt Calibration
If the remote sense (RS) signals are connected directly to the bridge resistors, the NI USB-9237 senses the actual bridge voltage sense and eliminates the gain errors caused by the resistance of the EX+ and EX– leads. - Page 14 2.5 V and 10 V are common. You can program the NI USB-9237 to supply 2.5 V, 3.3 V, 5 V, or 10 V of excitation voltage, and the module can provide up to 150 mW of excitation power.
- Page 15 Each channel on the NI USB-9237 has an independent 24-bit ADC and input amplifier that enable you to sample signals from all four channels simultaneously. The NI USB-9237 also includes filters to prevent aliasing. The filters on the NI USB-9237 filter according to the sampling rate. Understanding NI USB-9237 Filtering...
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Page 16: Alias-Free Bandwidth
Alias-Free Bandwidth Any signal that appears in the alias-free bandwidth of the NI USB-9237 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 equals the data rate minus the stopband frequency. - Page 17 Phase nonlinerarity 0 to 1 kHz........<0.001° 0 to 20 kHz........± 0.1° Input delay..........4.8 μs + 38.4/f Passband Frequency........0.45 · f Flatness ........... 0.1 dB max © National Instruments Corporation NI USB-9237 User Guide and Specifications...
- Page 18 1 kHz ..........100 dB 8 kHz ..........90 dB Excitation noise ........0.1 mV/V Rejection by analog prefilter of signal frequencies at oversample rate. Measured with a balanced cable. Shielded cables may be significantly unbalanced. NI USB-9237 User Guide and Specifications ni.com...
- Page 19 If you need to clean the module, wipe it with a dry towel. Safety Voltages Connect only voltages that are within these limits. Between any two terminals ....± 30 V max © National Instruments Corporation NI USB-9237 User Guide and Specifications...
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Page 20: Safety Standards
NI USB-9237 to signals or use for measurements within Measurement Categories II, III, or IV. Safety Standards The NI USB-9237 is designed to meet the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use: •... -
Page 21: Electromagnetic Compatibility
Refer to the Declaration of Conformity (DoC) for this product for any additional regulatory compliance information. To obtain the DoC for this product, visit , search by model number or product line, and click the ni.com/certification appropriate link in the Certification column. © National Instruments Corporation NI USB-9237 User Guide and Specifications... -
Page 22: Environmental Management
National Instruments (RoHS) National Instruments RoHS ni.com/environment/rohs_china (For information about China RoHS compliance, go to ni.com/environment/rohs_china Calibration You can obtain the calibration certificate for the NI USB-9237 at ni.com/calibration Calibration interval .........1 year NI USB-9237 User Guide and Specifications ni.com... -
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.
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