Related Manuals for National Instruments VXI-SC-1102
Summary of Contents for National Instruments VXI-SC-1102
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Page 1: User Manual
VXI-SC-1102/B/C User Manual 32-Channel Multiplexer Amplifier Submodules August 1997 Edition Part Number 321385B-01 © Copyright 1997 National Instruments Corporation. All rights reserved. - Page 2 Korea 02 596 7456, Mexico 5 520 2635, Netherlands 0348 433466, Norway 32 84 84 00, Singapore 2265886, Spain 91 640 0085, Sweden 08 730 49 70, Switzerland 056 200 51 51, Taiwan 02 377 1200, United Kingdom 01635 523545 National Instruments Corporate Headquarters 6504 Bridge Point Parkway Austin, TX 78730-5039 Tel: (512) 794-0100...
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Page 3: Important Information
National Instruments will, at its option, repair or replace equipment that proves to be defective during the warranty period. This warranty includes parts and labor. -
Page 4: Table Of Contents
National Instruments Documentation ... xi Related Documentation... xii Customer Communication ... xii Chapter 1 Introduction About the VXI-SC-1102/B/C ... 1-2 What You Need to Get Started ... 1-3 Software Programming Choices ... 1-4 National Instruments Application Software ... 1-4 NI-DAQ Driver Software ... 1-5 VXIplug&play Instrument Driver ... - Page 5 VXI Signal Conditioning System... 1-1 Figure 1-2. The Relationship between the Programming Environment, Your Instrument Driver, and Your VXI-DAQ Hardware ... 1-6 Figure 2-1. VXI-SC-1102/B/C Parts Locator Diagram ... 2-2 Figure 2-2. Bent and Trimmed Resistor... 2-3 VXI-SC-1102/B/C User Manual © National Instruments Corporation...
- Page 6 Figure 3-1. VXI-SC-1102/B/C Front Connector Pin Assignments... 3-2 Figure 3-2. Ground-Referenced Signal Connection ... 3-5 Figure 3-3. Floating Signal Connection Referenced to Chassis Ground... 3-6 Figure 4-1. VXI-SC-1102/B/C Block Diagram... 4-1 Figure 5-1. Analog Bus Receptacle Pin Assignment ... 5-2 Tables Table 3-1.
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Page 7: About This Manual
This manual describes the electrical and mechanical aspects of the VXI-SC-1102 family and contains information concerning their installation and operation. The VXI-SC-1102 family is a group of signal conditioning submodules in the VXI-data acquisition (VXI-DAQ) line of National Instruments products. -
Page 8: Conventions Used In This Manual
Appendix B, Calibration Sample Program, contains a sample program to help you calibrate your submodule. Appendix C, Customer Communication, contains forms you can use to request help from National Instruments or to comment on our products. The Glossary contains an alphabetical list and description of terms used in this manual, including abbreviations, acronyms, metric prefixes, mnemonics, symbols, and general data acquisition terms. -
Page 9: National Instruments Documentation
Refers to the signal conditioning minipods in the VXI signal conditioning system. VXI-MIO module Refers to any of the National Instruments VXI-MIO series of plug-in data acquisition devices. VXI-SC submodule Refers to VXI signal conditioning hardware that installs onto the carrier module. -
Page 10: Related Documentation
The following document contains information you may find helpful: • Customer Communication National Instruments wants to receive your comments on our products and manuals. We are interested in the applications you develop with our products, and we want to help if you have problems with them. To make it easy for you to contact us, this manual contains comment and configuration forms for you to complete. -
Page 11: Introduction
VXI-SC-1102/B/C submodule. The VXI-SC-1102 family is part of the VXI signal conditioning system, which consists of a carrier module and one or more VXI signal conditioning submodules or filler panels as shown in Figure 1-1. -
Page 12: About The Vxi-Sc-1102/B/C
0-20 mA process-current sources. The VXI-SC-1102 has 32 differential analog input channels and one cold-junction sensor channel. On each channel, the VXI-SC-1102 has a three-pole lowpass filter with a 2 Hz cutoff frequency to reject 60 Hz noise. Each channel also has an amplifier with a selectable gain of 1 or 100. -
Page 13: What You Need To Get Started
Detailed specifications of the VXI-SC-1102/B/C submodules are listed in Appendix A, Specifications. What You Need to Get Started To set up and use your VXI-SC-1102/B/C, you will need the following items: © National Instruments Corporation One of the following submodules:... -
Page 14: Software Programming Choices
Introduction Software Programming Choices There are several options to choose from when programming your National Instruments VXI-DAQ hardware. You can use LabVIEW, LabWindows/CVI, ComponentWorks, VirtualBench, or other application development environments with either NI-DAQ or the VXIplug&play instrument driver. Both NI-DAQ and the VXIplug&play instrument driver access the VXI-DAQ hardware... -
Page 15: Ni-Daq Driver Software
An example of a low-level function is writing directly to registers on the DAQ device. NI-DAQ does not sacrifice the performance of National Instruments DAQ devices because it lets multiple devices operate at their peak performance. -
Page 16: Vxiplug&Play Instrument Driver
Refer to Figure 1-2 to see the relationship between your VXI-DAQ hardware and your software. Optional Equipment National Instruments offers a variety of products to use with your VXI-SC-1102/B/C submodule, as follows: • •... -
Page 17: Unpacking
Unpacking Your VXI-SC-1102/B/C submodule is shipped in an antistatic package to prevent electrostatic damage to the submodule. Electrostatic discharge can damage several components on the submodule. To avoid such damage in handling the submodule, take the following precautions: • •... -
Page 18: Installation
This chapter describes how to install current-loop receivers on your VXI-SC-1102/B/C and gives information about installing your VXI-SC-1102/B/C into the VXI-SC-1000 carrier module. Refer to Figure 2-1, VXI-SC-1102/B/C Parts Locator Diagram, for information as you read the instructions in this chapter. © National Instruments Corporation... -
Page 19: Figure 2-1. Vxi-Sc-1102/B/C Parts Locator Diagram
Chapter 2 Installation 1 Serial Number 2 Product Name 3 Assembly Number 4 RCL x Pads Figure 2-1. VXI-SC-1102/B/C Parts Locator Diagram VXI-SC-1102/B/C User Manual © National Instruments Corporation... -
Page 20: Figure 2-2. Bent And Trimmed Resistor
0.65 in. above the surface of the circuit board. Figure 2-2. Bent and Trimmed Resistor Installation Guide to replace the VXI-SC-1102/B/C submodule in the carrier assembly. Chapter 2 Installation... -
Page 21: Installing Your Hardware
Chapter 2 Installation Installing Your Hardware Follow the instructions in the VXI-SC-1000 Carrier Module Installation Guide to install the assembled VXI-SC carrier module in the VXIbus chassis. VXI-SC-1102/B/C User Manual © National Instruments Corporation... -
Page 22: Signal Connections
Front Connector Figure 3-1 shows the pin assignments for the VXI-SC-1102/B/C submodule front connector. © National Instruments Corporation VXI-SC-1102/B/C User Manual... -
Page 23: Figure 3-1. Vxi-Sc-1102/B/C Front Connector Pin Assignments
CH21- CH22- CH23- CH24- CH25- CH26- CGND CH27- CJSENSOR CH28- CJSENSOR CH29- CGND CH30- +5 V CH31- Figure 3-1. VXI-SC-1102/B/C Front Connector Pin Assignments CH0+ CH1+ CH2+ CH3+ CH4+ CH5+ CH6+ CH7+ CH8+ CH9+ CH10+ CH11+ CH12+ CH13+ CH14+ CH15+... -
Page 24: Signal Descriptions
The differential input signal range of a VXI-SC-1102/B/C input channel is 10 V/G, where G is the gain selected on the VXI-SC-1102/B/C input channel. This differential input range is the maximum measurable voltage difference between the positive and negative channel inputs. -
Page 25: Ground-Referencing Your Signals
Applying a voltage greater than 42 VAC peak or VDC to the VXI-SC-1102/B/C is an electrical shock hazard. National Instruments is liable for any damages or injuries resulting from such voltage application. -
Page 26: Figure 3-2. Ground-Referenced Signal Connection
© National Instruments Corporation CH0 + CH0 - CH1 + CH1 - VXI-SC-1102/B/C Figure 3-2. Ground-Referenced Signal Connection Chapter 3 Signal Connections VXI-SC-1102/B/C User Manual... -
Page 27: Cold-Junction Sensor Connection
Cold-Junction Sensor Connection Pins A3 and A4 (CJSENSOR) connect the temperature sensor located on the National Instruments VXI-TB Series terminal block to the VXI-SC-1102/B/C. The CJSENSOR signal is measured relative to CGND. Pins A3 and A4 are connected together within the VXI-SC-1102/B/C so the position of the MTEMP/DTEMP switch on the VXI-TB Series terminal block does not matter. -
Page 28: Theory Of Operation
Theory of Operation This chapter contains a functional overview of the VXI-SC-1102/B/C submodules and explains the operation of each functional unit. Functional Overview The block diagram in Figure 4-1 illustrates the key functional components of the VXI-SC-1102/B/C submodules. CH 0 + Inst. -
Page 29: Vxibus Interface
Chapter 4 Theory of Operation The major components of the VXI-SC-1102/B/C submodules are as follows: • • • The VXI-SC-1102/B/C submodules consist of 32 multiplexed input channels, each with a software-programmable gain of 1 or 100. Each input channel has its own lowpass filter. The VXI-SC-1102/B/C submodules also have digital control circuitry for automatic control of channel scanning, temperature sensor selection, and gain selection. -
Page 30: Analog Circuitry
1 or 100. Then the signal passes through a three-pole lowpass filter. Note: Because of the 2 Hz bandwidth of the VXI-SC-1102 input channels, you must wait approximately 3 s after changing the gains before the channels settle and you can take an accurate measurement. NI-DAQ automatically reads the Status Register to determine when the module output has settled. -
Page 31: Analog Output
The 32 input channels and the CJSENSOR are multiplexed into one output. This output is passed to the VXI-SC-1000 carrier module, where it is connected to the analog bus for measurement by a VXI-MIO module. VXI-SC-1102/B/C User Manual © National Instruments Corporation... -
Page 32: Calibration
EEPROM. However, National Instruments recommends that you recalibrate your VXI-SC-1102/B/C at least once per year or when you operate the submodule outside the 20 to 30 C temperature range. In order to calibrate the VXI-SC-1102/B/C, you will need to apply precision voltages to the channel inputs and/or ground the channel inputs. -
Page 33: Gain And Offset Calibration
Gain and Offset Calibration To determine the offset and gain calibration factors of the VXI-SC-1102/B/C submodules for a given gain, perform the following steps for a two-point calibration. For two-point calibration, it is best to use input voltages that correspond to the signal range of interest. For example, to measure bipolar voltages over the submodule’s full input... - Page 34 This is also true for the positive full-scale voltage if you use the negative full-scale voltage and 0 V as your two calibration points. © National Instruments Corporation b. Measure the input voltage with the DMM. Call the measured voltage...
- Page 35 LabVIEW, ComponentWorks, or VirtualBench, you have the option to apply the calibration constants to measured voltages through the NI-DAQ API. Refer to Appendix B, Calibration Sample Program, for an example of a calibration program for your submodule. VXI-SC-1102/B/C User Manual © National Instruments Corporation...
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Page 36: Input Characteristics
Specifications This appendix lists the specifications for the VXI-SC-1102/B/C submodules. These specifications are typical at 25 C unless otherwise noted. VXI-SC-1102/B/C Analog Input Input Characteristics Number of channels ...32 differential Input signal ranges Max working voltage (signal + common mode) ...Each input should remain... -
Page 37: Dynamic Characteristics
Output impedance ... 0.1 Dynamic Characteristics Bandwidth (-3 dB) ... 2 Hz (1102) Scan interval (per channel, any gain) VXI-SC-1102/B/C User Manual Gain = 1 After calibration... 0.015% of reading max Before calibration ... 0.04% of reading Gain = 100 After calibration... - Page 38 Recommended warm-up time...20 min. Offset temperature coefficient Gain temperature coefficient ...10 ppm/ C Physical Dimensions ...115 by 273 mm I/O connector ...50-pin male ribbon cable © National Instruments Corporation 1102 50 Vrms 5 Vrms 1102 10 s Gain = 1 ...20 V/ C Gain = 100 ...1 V/ C...
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Page 39: Power Requirements
Storage temperature ... –55 to 150 C Relative humidity ... 5% to 90% noncondensing Power Requirements 5 V supply ... 15 mA max 15 V supply (regulated from 24 V supply) ... 150 mA max VXI-SC-1102/B/C User Manual © National Instruments Corporation... -
Page 40: Calibration Sample Program
Sample Program for Calibration The following sample C program will help you calibrate the VXI-SC-1102/B/C submodules. The calibration constants are stored only in NI-DAQ memory. You must enter the (input, output) voltage pairs read by a DMM by hand. Before running the sample program... - Page 41 = 0, dummyDAQboard, dummyDAQchan = 0, dummyDAQgain = 1, dummyDAQrange; VXI-SC-1102/B/C User Manual /* slot of module to calibrate */ /* These dummy variables would be used if the measurement actually came from a DAQ board and not an external DMM.
- Page 42 (moduleChan = 0; moduleChan < 32; moduleChan++) © National Instruments Corporation = enterInt ("\nEnter chassis ID of the VXI-SC chassis:"); = enterInt ("Enter slot of the VXI-SC-1102: = enterInt ("Enter device number of the DAQ board" "controlling the chassis: = commPath;...
- Page 43 SCXI_Change_Chan (vxiChassisID, moduleSlot, moduleChan); printf("Apply input voltage for point 1, channel %d, gain %.0f.\n" moduleChan, gain);, vInput1 vOutput1 = enterFloat ("Enter VXI-SC-1102 output voltage: printf("Apply input voltage for point 2, channel %d, gain %.0f.\n",moduleChan, gain); vInput2 = enterFloat ("Enter VXI-SC-1102 input voltage: vOutput2 = enterFloat ("Enter VXI-SC-1102 output voltage:...
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Page 44: Appendix C Customer Communication
Electronic Services Bulletin Board Support National Instruments has BBS and FTP sites dedicated for 24-hour support with a collection of files and documents to answer most common customer questions. From these sites, you can also download the latest instrument drivers, updates, and example programs. For recorded instructions on how to use the bulletin board and FTP services and for BBS automated information, call (512) 795-6990. -
Page 45: Telephone And Fax Support
Telephone and Fax Support National Instruments has branch offices all over the world. Use the list below to find the technical support number for your country. If there is no National Instruments office in your country, contact the source from which you purchased your software to obtain support. -
Page 46: Technical Support Form
National Instruments for technical support helps our applications engineers answer your questions more efficiently. If you are using any National Instruments hardware or software products related to this problem, include the configuration forms from their user manuals. Include additional pages if necessary. - Page 47 Complete a new copy of this form each time you revise your software or hardware configuration, and use this form as a reference for your current configuration. Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently.
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Page 48: Documentation Comment Form
Documentation Comment Form National Instruments encourages you to comment on the documentation supplied with our products. This information helps us provide quality products to meet your needs. Title: VXI-SC-1102/B/C User Manual Edition Date: August 1997 Part Number: 321385B-01 Please comment on the completeness, clarity, and organization of the manual. - Page 49 +5 volt signal degrees ohms percent plus or minus alternating current analog-to-digital analog-to-digital converter–an electronic device, often an integrated circuit, that converts an analog voltage to a digital number © National Instruments Corporation Value –12 –9 –6 –3 VXI-SC-1102/B/C User Manual Glossary...
- Page 50 (2) collecting and measuring the same kinds of electrical signals with A/D and/or DIO boards plugged into a computer, and possibly generating control signals with D/A and/or DIO boards in the same computer direct current VXI-SC-1102/B/C User Manual © National Instruments Corporation...
- Page 51 VXI or RS-232 programmable instrument or a specific plug-in DAQ board. Instrument drivers are available in several forms, ranging from a function callable language to a virtual instrument (VI) in LabVIEW. © National Instruments Corporation VXI-SC-1102/B/C User Manual Glossary...
- Page 52 AC power line, motors, generators, transformers, fluorescent lights, soldering irons, CRT displays, computers, electrical storms, welders, radio transmitters, and internal sources such as semiconductors, resistors, and capacitors. Noise corrupts signals you are trying to send or receive. VXI-SC-1102/B/C User Manual © National Instruments Corporation...
- Page 53 © National Instruments Corporation VXI-SC-1102/B/C User Manual Glossary...
- Page 54 VISA a new driver software architecture developed by National Instruments to unify instrumentation softwareGPIB, DAQ, and VXI. It has been accepted as a standard for VXI by the VXIplug&play Systems Alliance. volts, output high...
- Page 55 B-1 to B-4 CGND signal (table), 3-3 CH31- through CH0- signals (table), 3-3 CH31+ through CH0+ signals (table), 3-3 © National Instruments Corporation channel input signal connections, 3-3 to 3-4 common-mode input signal range, 3-3 to 3-4 differential input signal range, 3-3...
- Page 56 2-1 to 2-4 current-loop receivers, 2-3 hardware installation, 2-4 VXI-SC-1102/B/C User Manual parts locator diagram, 2-2 unpacking the VXI-SC-1102/B/C, 1-7 LabVIEW application software, 1-4 LabWindows/CVI application software, 1-4 manual. See documentation. Module ID Register, 4-2 NI-DAQ driver software, 1-5...
- Page 57 4-1 to 4-4 analog circuitry, 4-3 to 4-4 analog input channels, 4-3 analog output, 4-4 block diagram of VXI-SC-1102, 4-1 digital control circuitry, 4-2 to 4-3 functional overview, 4-1 to 4-2 VXIbus interface, 4-2 unpacking the VXI-SC-1102, 1-7...
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