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USER GUIDE AND SPECIFICATIONS

NI USB-9237

4-Channel, 24-Bit Half/Full-Bridge Analog Input Device

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. 

Introduction

The NI USB-9237 consists of two components: an NI 9237 module and an 
NI USB-9162 carrier, as shown in Figure 1.

Figure 1.  

NI USB-9237 Components

 

NI 9237

NI USB-9162

NI USB-9237

Hi-S

Peed USB 

Carrie

r

NI U

SB-91

62

Hi-

Speed 

USB Carrier

NI US

B-91

62

Summary of Contents for USB-9237

Page 1: ...ations 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 c...

Page 2: ...mited Refer to the Specifications section for more details Hot Surface This icon denotes that the component may be hot Touching this component may result in bodily injury Caution Do not disconnect I O...

Page 3: ...ming environments Select Start All Programs National Instruments NI DAQ NI DAQmx Help LabVIEW If you are a new user use the Getting Started with LabVIEW manual to familiarize yourself with the LabVIEW...

Page 4: ...NET you can interactively create channels and tasks by launching the DAQ Assistant from MAX or from within Visual Studio NET You can generate the configuration code based on your task or channel in Me...

Page 5: ...dio NET documentation To view the NI DAQmx NET documentation go to Start Programs National Instruments NI DAQ NI DAQmx NET Reference Help Expand NI Measurement Studio Help NI Measurement Studio NET Cl...

Page 6: ...stallation instructions that accompany your 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 f...

Page 7: ...th the carrier as shown in Figure 3 Figure 3 Module Installation 4 Squeeze the latches and insert the NI 9237 module into the USB 9162 carrier 5 Press firmly on the connector side of the NI 9237 modul...

Page 8: ...ormation LED Indicator The NI USB 9237 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 LE...

Page 9: ...can use to connect an external excitation voltage source to the module Table 2 lists the connections between an external excitation voltage source and the NI USB 9237 Note For a list of accessories a...

Page 10: ...e 2 Terminal Assignments RJ 50 10p10c Modular Plug and Receptacle Pin Numbers RJ 50 Pin RJ 45 Pin Signal Name Signal Description 1 SC Shunt calibration 2 1 AI Positive input signal 3 2 AI Negative inp...

Page 11: ...quarter bridge with the NI USB 9237 if you either add a resistor externally to create a half bridge or use the NI 9944 or NI 9945 Quarter Bridge Completion Accessory Visit ni com and search for the NI...

Page 12: ...alibration Remote Sensing Remote sensing continuously and automatically corrects for errors in excitation leads and generally is most appropriate for full and half bridge sensors Long wire and smaller...

Page 13: ...ls connected to the sensor and then apply or remove the shunt calibration resistance in software While remote sensing corrects for resistances from the EX terminals on the NI USB 9237 to the sensor sh...

Page 14: ...ment The 150 mW limit allows you to power full and half bridges as follows Four 350 half bridges at 5 0 V Four 350 full bridges at 3 3 V Four 120 half bridges at 2 5 V If you need an excitation voltag...

Page 15: ...he NI USB 9237 represents signals within the passband as accurately as possible as quantified primarily by passband flatness and phase nonlinearity The filters reject frequencies within the stopband a...

Page 16: ...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 dat...

Page 17: ...brated Phase nonlinerarity 0 to 1 kHz 0 001 0 to 20 kHz 0 1 Input delay 4 8 s 38 4 fs Passband Frequency 0 45 fs Flatness 0 1 dB max Error Percent of Reading Gain Error Percent of Range Offset Error C...

Page 18: ...rth ground2 140 dB 0 to 60 Hz Relative to EX 85 dB 0 to 1 kH Input noise Spurious free dynamic range SFDR 106 dB 1 KHz 60 dBFS Total harmonic distortion fundamental 20 dBFS 1 kHz 100 dB 8 kHz 90 dB Ex...

Page 19: ...power 150 mW max External voltage 2 V to 10 V Power Requirements Current consumption from USB 500 mA max Suspend mode 2 5 mA max Bus Interface USB specification USB 2 0 Hi Speed Physical Characterist...

Page 20: ...by regulated low voltage sources and electronics Do not connect the NI USB 9237 to signals or use for measurements within Measurement Categories II III or IV Safety Standards The NI USB 9237 is desig...

Page 21: ...munity EN 55011 Emissions Group 1 Class A CE C Tick ICES and FCC Part 15 Emissions Class A Note For EMC compliance operate this device with double shielded cables CE Compliance This product meets the...

Page 22: ...egulations and directives with which NI complies as well as other environmental information not included in this document Waste Electrical and Electronic Equipment WEEE EU Customers At the end of thei...

Page 23: ...onal 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 ca...

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