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Chapter 3

Signal Connections

VXI-SC-1102 User Manual

3-28

©

National Instruments Corporation

Figure 3-3.

Floating Signal Connection Referenced to Chassis Ground

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. The CJSENSOR signal is measured relative to CGND.
Pins A3 and A4 are connected within the VXI-SC-1102 so the position
of the MTEMP/DTEMP switch on the VXI-TB Series terminal block
does not matter. The input is overvoltage-protected to 15 VDC with the
power on and off.

Warning: Exceeding the overvoltage protection on the CJSENSOR input can damage

the VXI-SC-1102, the VXIbus, and the VXI-MIO board. National
Instruments is

NOT

liable for any damages or injuries resulting from such

signal connections.

V

s

-

+

CH0 +

Front Signal

Connector

+

-

CH0 -

+

-

CH1 +

CH1 -

VXI-SC-1102

CGND

Reference to

Chassis Ground

Floating

Signal

Make this connection to

ground reference the signal.

!

01Title.book : 07Ch3.frm Page 28 Friday, March 21, 1997 3:40 PM

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Содержание VXI-SC-1102

Страница 1: ...nual 32 Channel Multiplexer Amplifier Module February 1997 Edition Part Number 321385A 01 Copyright 1997 National Instruments Corporation All Rights Reserved 01Title book 01Title frm Page 1 Friday Mar...

Страница 2: ...2321 France 01 48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 Israel 03 5734815 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico 5 520 2635 Netherlands 0348 433466 Norway 32 84 84 0...

Страница 3: ...EVEN IF ADVISED OF THE POSSIBILITY THEREOF This limitation of the liability of National Instruments will apply regardless of the form of action whether in contract or tort including negligence Any act...

Страница 4: ...1 3 Software Programming Choices 1 3 National Instruments Application Software 1 3 NI DAQ Driver Software 1 4 VXIplug play Instrument Driver 1 5 Optional Equipment 1 6 Unpacking 1 6 Chapter 2 Install...

Страница 5: ...Appendix A Specifications Appendix B Customer Communication Glossary Index Figures Figure 1 1 VXI Signal Conditioning System 1 1 Figure 1 2 The Relationship between the Programming Environment Your In...

Страница 6: ...ation vii VXI SC 1102 User Manual Figure 4 1 VXI SC 1102 Block Diagram 4 1 Figure 5 1 Analog Bus Receptacle Pin Assignment 5 2 Tables Table 3 1 Front Connector Signal Descriptions 3 3 01Title book 03T...

Страница 7: ...VXI SC 1102 lists what you need to get started optional software and optional equipment and explains how to unpack the VXI SC 1102 Chapter 2 Installation describes how to install current loop receiver...

Страница 8: ...cross reference or an introduction to a key concept monospace Denotes text or characters that are to be literally input from the keyboard sections of code programming examples and syntax examples This...

Страница 9: ...er software includes NI DAQ and VXIplug play instrument drivers After you set up your hardware system use either your application or driver software documentation to help you write your application If...

Страница 10: ...f 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 Figure 1 1 VXI Signal Conditioning Sy...

Страница 11: ...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 You can multiplex the VXI SC 1102 inputs to a single output which drives a sin...

Страница 12: ...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 VXIpl...

Страница 13: ...load and save waveform data to disk in the same forms that can be used in popular spreadsheet programs and word processors Using LabVIEW LabWindows CVI ComponentWorks or VirtualBench software will gr...

Страница 14: ...contain high level software functions whose architecture is specified by the VXIplug play Systems Alliance The VXIplug play standards increase interoperability with other vendors and ensure that driv...

Страница 15: ...o 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 Gro...

Страница 16: ...l current loop receivers on your VXI SC 1102 and gives information about installing your VXI SC 1102 submodule into the VXI SC 1000 carrier module Refer to Figure 2 1 VXI SC 1102 Parts Locator Diagram...

Страница 17: ...2 Installation VXI SC 1102 User Manual 2 20 National Instruments Corporation 1 Serial Number 2 Product Name 3 Assembly Number 4 RCLx Pads 3 4 2 1 01Title book 06Ch2 frm Page 20 Friday March 21 1997 3...

Страница 18: ...sure that there are no signals connected to your submodule front connector Install the resistors by performing the following steps 1 Follow the instructions in the VXI SC 1000 Carrier Module Installat...

Страница 19: ...ration Installing Your Hardware Follow the instructions in the VXI SC 1000 Carrier Module Installation Guide to replace the VXI SC 1102 submodule and to install the assembled VXI SC carrier module in...

Страница 20: ...t connector Caution Static electricity is a major cause of component failure To prevent damage to the electrical components in the module observe antistatic techniques whenever removing a module from...

Страница 21: ...31 32 A CH31 CH30 CH29 CH28 CH27 CH26 CH25 CH24 CH23 CH22 CH21 CH20 CH19 CH18 CH17 CH16 CH15 CH14 CH13 CH12 CH11 CH10 CH9 CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1 CH0 CH31 CH30 CH29 CH28 CH27 CH26 CH25 CH24 CH...

Страница 22: ...gain selected on the VXI SC 1102 input channel This differential input range is the maximum measurable voltage difference between the positive and negative channel inputs The common mode input signal...

Страница 23: ...uch voltage application Note Exceeding the differential or common mode input channel ranges results in a distorted signal measurement Ground Referencing Your Signals Your input signals can be either g...

Страница 24: ...ational Instruments Corporation 3 27 VXI SC 1102 User Manual Figure 3 2 Ground Referenced Signal Connection Vdiff V CH0 Front Signal Connector CH0 CH1 CH1 VXI SC 1102 cm 01Title book 07Ch3 frm Page 27...

Страница 25: ...XI SC 1102 so the position of the MTEMP DTEMP switch on the VXI TB Series terminal block does not matter The input is overvoltage protected to 15 VDC with the power on and off Warning Exceeding the ov...

Страница 26: ...VXI SC 1102 Figure 4 1 VXI SC 1102 Block Diagram Front Signal Connector CH 0 Gain 0 CH 0 CH 31 CH 31 Lowpass Filter Digital Control Calibration EEPROM Lowpass Filter Lowpass Filter CJSENSOR Gain 31 G...

Страница 27: ...e address handler and the following registers Module ID Configuration Status EEPROM Gain and Channel The address handler controls which register is being addressed The Module ID Register contains the...

Страница 28: ...consists of a thermistor located on a National Instruments VXI terminal block The temperature sensor is for cold junction compensation of thermocouples The CJSENSOR channel also passes through a 2 Hz...

Страница 29: ...data in the EEPROM refer to the VXI SC 1102 Register Level Programmer Manual for a more detailed description of the EEPROM In order to calibrate the VXI SC 1102 you will need to apply precision voltag...

Страница 30: ...the VXI SC 1102 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...

Страница 31: ...units to your VXI MIO module binary unit You must take into consideration the polarity of your VXI MIO module its resolution 12 bits or 16 bits and gain For example if you are using the 12 bit VXI MI...

Страница 32: ...elp you calibrate the VXI SC 1102 The calibration constants are stored only in NI DAQ memory The input output voltage pairs read by a DMM must be entered by hand Before this program is run the NI DAQ...

Страница 33: ...do fputs prompt stdout fflush stdin ret scanf lf value while ret return value void main int vxiChassisID commPath moduleSlot slot of module to calibrate moduleChan short dummyRangeCode 0 dummyDAQboard...

Страница 34: ...he chassis while commPath 0 dummyDAQboard commPath dummyDAQrange MIO_FULL_SCALE dummyDAQgain scale pow 2 0 12 0 dummyDAQgain 10 factor for converting to format of 12 bit bipolar DAQ board SCXI_Reset v...

Страница 35: ...input voltage User enters vInput2 vOutput2 enterFloat Enter VXI SC 1102 output voltage User enters vOutput2 binOutput1 vOutput1 scale binOutput2 vOutput2 scale Convert to DAQ board s format SCXI_Cal_C...

Страница 36: ...n 1 Max working voltage signal common mode Each input should remain within 10 V of CGND Input damage level 42 VAC peak or VDC Inputs protected CH 0 31 CJSENSOR Transfer Characteristics Nonlinearity 0...

Страница 37: ...rload 10 k Input bias current 0 5 nA Input offset current 1 0 nA CMRR 50 to 60 Hz either gain 110 dB 0 Hz gain 1 75 dB min 0 Hz gain 100 100 dB min Output range 10 V Output impedance 91 Dynamic Charac...

Страница 38: ...in temperature coefficient 10 ppm C Physical Dimensions 115 by 273 mm 4 54 by 10 75 in I O connector 50 pin male ribbon cable rear connector 96 pin male DIN C front connector Environment Operating tem...

Страница 39: ...ons we offer fax and telephone support through our technical support centers which are staffed by applications engineers Electronic Services National Instruments has BBS and FTP sites dedicated for 24...

Страница 40: ...our software to obtain support Telephone Fax Australia 03 9879 5166 03 9879 6277 Austria 0662 45 79 90 0 0662 45 79 90 19 Belgium 02 757 00 20 02 757 03 11 Canada Ontario 905 785 0085 905 785 0086 Can...

Страница 41: ...________________ _______________________________________________________________________________ National Instruments hardware product model __________ Revision ______________________ Configuration __...

Страница 42: ...____ Microprocessor _______________________________________________________________ Clock frequency _______________________________________________________________ Type of video board installed ______...

Страница 43: ...____________________ _______________________________________________________________________________ _______________________________________________________________________________ ___________________...

Страница 44: ...ers Symbols 5 V 5 volt signal degrees ohms percent plus or minus A AC alternating current A D analog to digital Prefix Meaning Value p pico 10 12 n nano 10 9 micro 10 6 m milli 10 3 k kilo 103 M mega...

Страница 45: ...und signal channel pin or wire lead to which you apply or from which you read the analog or digital signal Analog signals can be single ended or differential For digital signals you group channels to...

Страница 46: ...of signal conditioning that allows you to filter unwanted signals from the signal you are trying to measure G G gain the factor by which a signal is amplified sometimes expressed in decibels H hex hex...

Страница 47: ...o vibration or shock MB megabytes of memory MIO multifunction I O MSB most significant bit mux multiplexer a switching device with multiple inputs that sequentially connects each of its inputs to its...

Страница 48: ...unction produces a small voltage as a function of the temperature transducer excitation a type of signal conditioning that uses external voltages and currents to excite the circuitry of a signal condi...

Страница 49: ...eXtensions for Instrumentation VXIplug play A group of VXI developers dedicated to making VXI devices as Systems Alliance easy to use as possible primarily by simplifying software development W wavef...

Страница 50: ...ange 3 4 differential input signal range 3 3 exceeding input levels and ranges warning 3 4 signal terminals 3 3 Channel Register 4 2 CJSENSOR signal cold junction sensor connection 3 6 description tab...

Страница 51: ...to 1 5 P parts locator diagram 2 2 physical specifications A 3 pins front connector pin assignments figure 3 2 front connector signal descriptions table 3 3 power requirements A 3 R requirements for g...

Страница 52: ...els 4 3 analog output 4 3 block diagram of VXI SC 1102 4 1 digital control circuitry 4 2 functional overview 4 1 to 4 2 VXIbus interface 4 2 U unpacking the VXI SC 1102 1 6 V VirtualBench application...

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