SISTEME DE CONDITIONARE DE SEMNAL

Overview Prezentare generala

Signal conditioning is one of the most important -- and most overlooked -- components of a data acquisition system. Conditionarea de semnal este una dintre cele mai importante componente ale unui sistem de achizitie de date si cele mai trecute cu vederea. With it, you can bring real-world signals into your digitizer. Cu acesta, puteti aduce semnale din lumea reala in compiuterul dumneavoastra.Many sensors require special signal conditioning technology, and no instrument has the capability to provide all types of signal conditioning to all sensors.

Senzori au nevoie de tehnologia speciala de conditionare a semnalului. Nici un instrument nu are capacitatea de a furniza toate tipurile de conditionare a semnalului pentru toti senzori. For example, thermocouples produce very low voltage signals, which require amplification, filtering and linearization. De exemplu, termocupluri produc semnale foarte joasa ,tensiune care necesita amplificare, filtrare si liniarizare. Other sensors, such as strain gauges and accelerometers, require power in addition to amplification and filtering, while other signals may require isolation to protect the system from high voltages. Alti senzori, cum ar fi transductoarele si accelerometre,au nevoie de o putere in plus fata de amplificare si filtrare, in timp ce alte semnale pot solicita izolare pentru a proteja sistemul de la tensiuni ridicate. No single instrument can provide the flexibility required to make all of these measurements.Un singur instrument poate oferi flexibilitatea necesara pentru a face toate aceste masuratori. However, with front-end signal conditioning, you can combine the necessary technologies to bring these various types of signals into a single data acquisition system. Cu toate acestea, cu conditionarea semnalului front-end, puteti combina tehnologiile necesare pentru a aduce aceste tipuri diferite de semnale intr-un singur sistem de achizitie de date.

Not all front-end signal conditioning options are equal. Nu toate front-end de conditionare de semnal sunt egale. Most choices are nonintelligent, parallel-in/parallel-out configurations that offer the bare minimum of functionality for a select few signals or sensor types. Cele mai multe alegeri sunt configuratii non intelligent, parallel-in/parallel-out care ofera minimul de functionalitate pentru a selecta cateva semnale sau tipuri de senzori. However, for computer-based measurement and automation, you want a system designed to take advantage of the latest PC-based data acquisition and instrumentation technologies. Cu toate acestea, pentru masurarea pe calculator si de automatizare, doriti un sistem conceput pentru a profita de cele mai recente achizitii de date pe baza de PC si tehnologii de instrumentatie. This system should have programmable input settings, the ability to be automatically detected by your computer, and tight integration with your software to handle scaling and channel management. Acest sistem ar trebui sa aiba setari programabile de intrare, capacitatea de a fi detectat automat de catre computer, si stransa legatura cu softul, sa se ocupe de scanare si de gestionare a canalului. Your system should offer all of the conditioning technologies you need, proof of its accuracy, and the capability to take advantage of the advances in high-speed digitizers. Sistemul dumneavoastra ar trebui sa ofere toate tehnologiile de conditionare care aveti nevoie si capacitatea de a profita de progresele in digitizoare de mare viteza. Experienced users of signal conditioning systems should skip directly to the Critical Technologies section.

Signal Conditioning Background Conditionare a semnalului de fundal

Most signals require some form of preparation before they can be digitized. Cele mai multe semnale necesita o forma de pregatire inainte de a fi digitalizate. As previously mentioned, thermocouple signals are very small voltage levels that must be amplified before they can be digitized. Asa cum am mentionat anterior, semnalele unor termocupluri au niveluri foarte mici, de tensiune care trebuie amplificate inainte ca ele sa fie digitalizate. Other sensors, such as RTDs, thermistors, strain gauges, and accelerometers, require electrical power to operate. Alti senzori, cum ar fi RTD, termistori, transductoarele, si accelerometre, au nevoie de energie electrica sa functioneze. Even pure voltage signals can require special technologies for blocking large common-mode signals or for safely measuring high voltages. Chiar si semnalele pur tensiune pot necesita tehnologii speciale pentru blocarea semnalelor de mod comun mari sau pentru masurarea in conditii de siguranta a tensiuni ridicate. All of these preparation technologies are forms of signal conditioning. Toate aceste tehnologii de pregatire sunt forme de conditionare de semnal.

Because of the vast array of signal conditioning technologies, the role and need for each technology can quickly become confusing. Datorita unei game largi de tehnologii de conditionare de semnal, rolul si necesitatea pentru fiecare tehnologie poate deveni rapid confuz. Therefore, we've provided a list of common types of signal conditioning, their functionality, and examples of when you need them. Prin urmare, am furnizat o lista de tipuri comune de conditionare semnal, functionalitatea lor, si exemple cand aveti nevoie de ele.

• Amplification -- When the voltage levels you are measuring are very small, amplification is used maximize the effectiveness of your digitizer. Amplificare - In cazul nivelurile de tensiune de masurare foarte mici, amplificarea este folosita la maximinizarea eficientei digitilor dumneavoastra. By amplifying the input signal, the conditioned signal uses more of the effective range of the analog-to-digital converter (ADC) and enhances the accuracy and resolution of the measurement. Prin amplificarea semnalului de intrare, semnalul conditionat utilizeaza mai multe raze de actiune a convertorului analog-digital (ADC) si imbunatateste precizia si rezolutia de masurare. Typical sensors that require amplification are thermocouples and strain gauges. senzori tipice care necesita amplificare sunt termocupluri si transductoarele.

• Attenuation -- Attenuation is the opposite of amplification. Atenuarea - Atenuarea este opusul amplificari. It is necessary when the voltages to be digitized are beyond the input range of the digitizer. Este necesara atunci cand tensiunile care urmeaza sa fie digitalizate sunt dincolo de gama de intrare a digitilor. This form of signal conditioning diminishes the amplitude of the input signal so that the conditioned signal is within the range of the ADC. Aceasta forma de conditionare a semnalului diminueaza amplitudinea semnalului de intrare, astfel incat semnalul conditionat este in raza de actiune a ADC. Attenuation is necessary for measuring high voltages. Atenuarea este necesara pentru masurarea tensiuni ridicate.

• Isolation -- Voltage signals well outside the range of the digitizer can damage the measurement system and harm the operator. Izolarea - semnale de tensiune in afara intervalului de digitizare poate afecta sistemul de masurare si operator. For that reason, isolation is usually required in conjunction with attenuation to protect the system and the user from dangerous voltages or voltage spikes. Din acest motiv, izolarea este de obicei necesara in legatura cu atenuare pentru a proteja sistemul si utilizatorul de tensiuni periculoase sau varfuri de tensiune. Isolation may also be required when the sensor is on a different ground plane from the measurement sensor (such as a thermocouple mounted on an engine). Izolarea poate fi de asemenea necesara in cazul in care senzorul este pe un plan diferita de masa fata de senzorul de masurare (cum ar fi un termocupla montat pe un motor).

• Multiplexing -- Typically, the digitizer is the most expensive part of a data acquisition system. Multiplexare - De obicei, digitizare este cea mai costisitoare parte a unui sistem de achizitie de date. By multiplexing, you can sequentially route a number of signals into a single digitizer, thus achieving a cost-effective way to greatly expand the signal count of your system. De multiplexare, puteti trasa secvential o serie de semnale intr-un singur digitizor, obtinandu-se astfel un mod cost-eficient de a extinde considerabil numarul semnalul . Multiplexing is necessary for any high-channel-count application. Multiplexare este necesar pentru orice aplicatie de inalta-canal-conta.

• Filtering -- Filtering is required to remove unwanted frequency components from a signal, primarily to prevent aliasing and reduce signal noise. Filtrarea - Filtrarea este necesara pentru a elimina componentele nedorite de frecventa de la un semnal si reduce zgomotul de semnal. Thermocouple measurements typically require a lowpass filter to remove power line noise from the signals. masuratorile Termocuplei necesita de obicei o trecere scazuta de filtru pentru a elimina zgomotul linie de alimentare de la semnale. Vibration measurements normally require an antialiasing filter to remove signal components beyond the frequency range of the acquisition system. masuratori de vibratii, necesita in mod normal un filtru pentru a elimina componentele de semnal, dincolo de domeniul de frecventa al sistemului de achizitie.

• Excitation -- Many sensors, such as RTDs, strain gauges, and accelerometers, require some form of power to make a measurement. Excitatie Cum ar fi RTD, transductoarele, si accelerometrele, necesita o forma de putere pentru a face o masurare. Excitation is the signal conditioning technology required to provide this power. Excitatie este conditionat tehnologic semnalul necesar pentru a oferi aceasta putere. This excitation can be a voltage or current source, depending on the sensor type. Aceasta excitatie poate fi o sursa de tensiune sau curent, in functie de tipul senzorului.

• Linearization -- Some types of sensors produce voltage signals that are not linearly related to the physical quantity they are measuring. Liniarizarea - Unele tipuri de senzori produc semnale de tensiune care nu sunt liniar legate de cantitatea fizica de masurare. Linearization, the process of interpreting the signal from the sensor as a physical measurement, can be done either with signal conditioning or through software. Liniarizare, procesul de interpretare a semnalului de la senzo la o masurare fizic, se poate face fie cu conditionare de semnal sau prin intermediul software-ului. Thermocouples are the classic example of a sensor that requires linearization. Termocupluri sunt exemplul clasic de senzor care necesita liniarizare.

• Cold-Junction Compensation -- Another technology required for thermocouple measurements is cold-junction compensation (CJC). Rece-Junction Compensare - O alta tehnologie necesara pentru masuratorile termocuplu este rece-jonctiune compensare (CJC). Any time a thermocouple is connected to a data acquisition system, the temperature of the connection must be known in order to calculate the true temperature the thermocouple is measuring. Orice moment, o termocupla este conectata la un sistem de achizitie de date, temperatura de conectare trebuie sa fie cunoscuta, pentru a calcula temperatura adevata termocuplei de masurare. A built-in CJC sensor must be present at the location of the connections. Un senzor de CJC trebuie sa fie prezent la locul de conexiuni.

• Simultaneous Sampling -- When it is critical to measure two or more signals at the same instant in time, simultaneous sampling is required. Simultana de esantionare - Cand este critica pentru a masura doua sau mai multe semnale de la acelasi moment in timp, de prelevare de probe simultane este necesar. Front-end signal conditioning can provide a much more cost-effective simultaneous sampling solution than purchasing a digitizer for each channel. conditionat Front-end semnalul poate oferi o solutie mult mai cost-eficient de esantionare simultana decat achizitionarea unui digitizor pentru fiecare canal. Typical applications that might require simultaneous sampling include vibration measurements and phase-difference measurements. Aplicatiile tipice care ar putea necesita esantionare simultana includ masuratori de vibratii si masuratori faza-diferenta.

Most sensors require a combination of the previously described signal conditioning technologies. Cei mai multi senzori necesita o combinatie de tehnologii descrise anterior de conditionare de semnal. Again, the thermocouple is the classic example because it requires amplification, linearization, cold-junction compensation, filtering, and sometimes isolation. Din nou, termocupla este exemplul clasic pentru ca necesita amplificare, liniarizare, de compensare a jonctiunii reci, filtrare, si, uneori, izolare. Ideally, a good measurement platform should give you the ability to select the type of signal conditioning that is needed for your application. In mod ideal, o platforma de masurare buna ar trebui sa va dea posibilitatea de a selecta tipul de conditionare de semnal de care este necesar pentru aplicatia dumneavoastra. In some systems, front-end signal conditioning is an option, but in other systems, front-end signal conditioning is a necessity to make the required measurements. In unele sisteme, conditionat de front-end semnalul este o optiune, dar in alte sisteme, conditionat de front-end semnalul este necesar pentru a face masuratorile necesare. As a rule of thumb, your measurement system should include front-end signal conditioning if you are planning to use any of the following sensors: Ca o regula de degetul mare, sistemul de masurare ar trebui sa includa front-end conditionare semnal, daca sunteti de planificare pentru a utiliza oricare dintre senzori urmatoari:

• Thermocouples Termocuple
• RTDs RTD
• Thermistors Termistoare
• Strain gauges Strain de masurare
• Force/load/torque transducers Forta / sarcina / traductoare de cuplu
• LVDTs/RVDTs/resolvers LVDTs / RVDTs / rezolvere
• Accelerometers Accelerometre
• Mixed low-voltage/high-voltage sources Mixte surse low-voltage/high-voltage
• Current sources surse de curent
• Resistance sources Rezistenta surse

Critical Technologies Tehnologii critice

When front-end signal conditioning is necessary for your data acquisition system, you should choose a system that takes advantage of the latest advances in computer-based measurement and automation. Cand este necesar conditionarea de semnal pentru sistemul dvs.Atunci cind se doreste sa se faca achizitii de date, ar trebui sa alegeti un sistem care profita de cele mai recente progrese in masurarea pe calculator si automatizare. For your signal conditioning platform to fully exploit these advances, there are several critical technologies that it should possess. Pentru platforma conditionat semnal pentru a exploata pe deplin aceste progrese, exista mai multe tehnologii critice care ar trebui folosite. These critical technologies ensure that you get a high-performance signal conditioning platform that integrates tightly with the rest of your system, all at a reasonable total cost. Aceste tehnologii critice asigura ca veti obtine o conditionare de inalta performanta platforma de semnal care se integreaza bine cu restul sistemului, toate la un cost total rezonabil. The primary technologies we will examine in depth are integration, calibration, connectivity, switching, isolation, expandability, bandwidth, software, and ease of use. Tehnologiile primare le vom examina in detaliu :ele sunt de integrare, calibrare, conectivitate , comutare, izolare, extindere, latime de banda si software-ul. By understanding each of these technologies, you will be able make an informed decision on the purchase of a front-end signal conditioning system. Prin intelegerea fiecarei dintre aceste tehnologii, veti putea lua o decizie informata cu privire la achizitionarea unui sistem de conditionare a semnalului front-end.

Integration Integrare
The ability of your front-end signal conditioning system to integrate easily with the rest of your system is technology that is a must. Capacitatea sistemului dvs. De a conditiona semnalul front-end pentru a integra cu usurinta restul sistemului este o tehnologie care este o necesitate. Your system should be modular, thus giving you the ability to choose the types of signal conditioning necessary for your system. Sistemul dumneavoastra ar trebui sa fie modular, astfel oferindu-va posibilitatea de a alege tipurile de conditionare de semnal necesar pentru sistemul dumneavoastra. It is also critical to have a system that accommodates mixed signal types. De asemenea, este critic de a avea un sistem care sa cuprinda tipurile de semnal mixt. For example, you should be able to connect currents, high voltages, various sensors, analog outputs, digital I/O, and switching all into the same platform. De exemplu, ar trebui sa puteti conecta curenti, tensiuni mari, senzori de diverse, iesiri analogice, digital I / O, si de comutare toate in aceeasi platforma.

Calibration De calibrare
One of the most critical technologies that a front-end signal conditioning system should possess is the ability to be easily and accurately calibrated. Una dintre cele mai critice tehnologii pe care un front-end sistem de conditionare semnal ar trebui sa il posede este abilitatea de a fi usor si corect calibrat. Most measurement devices are calibrated at the factory, but the accuracy immediately starts to drift with time and temperature changes. Cele mai multe aparate de masura sunt calibrate din fabrica, dar precizia imediat incepe sa deriva cu schimbarile de timp si de temperatura. To make the most accurate measurements possible, it is necessary to periodically calibrate the entire data acquisition system. Pentru a face masuratori cit mai exact posibil, este necesar a calibra periodic intregul sistem de achizitie de date. If your system has precision onboard voltage references, you can adjust your measurement system to compensate for temperature changes. Daca sistemul dvs. are o precizie la bord referinte de tensiune, puteti ajusta sistemul de masurare pentru a compensa schimbarile de temperatura. In addition, you must have access to external calibration services to keep your system performing up to the manufacturer's specifications year after year. In plus, trebuie sa aveti acces la servicii de calibrare externe pentru a mentine performantele sistemului dvs an dupa an. It is very important to learn the calibration process for any front-end signal conditioning system under consideration because that is the only way to ensure that your investment contains the technology you need to make accurate and reliable measurements. Este foarte important pentru a afla procesul de calibrare pentru orice sistem de conditionare a semnalului de front-end in considerare, deoarece aceasta este singura modalitate de a se asigura ca investitia dumneavoastra contine tehnologia de care aveti nevoie pentru a face masuratori exacte si fiabile.

Connectivity Conectivitate
Because connecting your signals to your signal conditioning system can be a major issue, it is critical to select a platform that gives you the connectivity options you need. Deoarece conectarea semnalele tale la sistemul de conditionarea a semnalului poate fi o problema majora, este critica pentru a selecta o platforma care va ofera optiuni de conectivitate de care aveti nevoie. A good front-end signal conditioning system should give you a wide range of connectivity options, including thermocouple plugs, screw terminals, and BNC connectors. Un bun front-end sistem de conditionare de semnal ar trebui sa va dea o gama larga de optiuni de conectivitate, inclusiv prize termocuple, terminale cu suruburi, si conectori BNC.

Switching Comutare
In today's demanding test environments, the ability to route signals easily throughout your measurement system is a technology that can lead to huge improvements in test times. Mediile de astazi sunt exigente.Au abilitatea de a semnala semnale de cale cu usurinta pe intreg sistem de masurare este o tehnologie care poate duce la imbunatatiri uriase in vremuri de incercare. As an example, consider a case where a unit under test (UUT) must be subjected to four separate measurements in the testing process. Ca un exemplu, consideram un caz in care o unitate sub test (USI) trebuie sa fie supuse la patru masuratori separate in procesul de testare. Without the proper technology, the UUT must be reconnected to each different measurement device for each test. Fara tehnologie corespunzatoare, UUT trebuie sa fie reconectate la fiecare dispozitiv de masurare diferit pentru fiecare test. With state-of-the art switching technology, you can not only route the UUT leads automatically to each measurement device in turn, but also test several UUTs at the same time. Cu state-of-the-art tehnologie de comutare, puteti duce nu numai traseul UUT automat la fiecare dispozitiv de masurare. You thus achieve more efficient use of your test equipment, faster test times, and less user intervention. Puteti obtine astfel o utilizare mai eficienta a echipamentelor de test, ori mai rapid de testare, si mai putine interventi ale utilizatorului. The selection of a front-end signal conditioning system that offers this technology can have a huge impact on the overall performance of your system. Procesul de selectie a unui sistem de conditionare a semnalului front-end, care ofera aceasta tehnologie poate avea un impact enorm asupra performantei generale a sistemului dumneavoastra.

Isolation Izolare
Another important technology to consider is isolation. O alta tehnologie importanta care se ia in considerare este izolarea. When you are measuring signals that either are high-voltage signals or are subject to voltage spikes, it is critical that those signals are isolated from the rest of your system. Cand se masoara semnale care sunt fie semnalele de inalta tensiune sau sunt supuse unor tensiune, este foarte important ca aceste semnale sa fie izolate de restul sistemului. OInadequate isolation compromises the safety of the operator, as well as the integrity of the entire data acquisition system. izolare inadecvata compromite siguranta operatorului, precum si integritatea intregului sistem de achizitie de date. When determining the isolation requirements of your system, it is imperative to have reliable and accurate isolation specifications, including both a safe working voltage rating and an installation rating. La stabilirea cerintelor de izolare a sistemului dvs., este imperativ sa aiba specificatii fiabile si exacte pentru izolare, inclusiv un rating de tensiune de lucru in conditii de siguranta si un rating de instalare.

Expandability Extensibilitate
Any front-end signal conditioning system should be easily expandable. Orice front-end sistem de conditionare semnal trebuie sa fie usor extensibile. Adding more channels or different types of signals to your system must not require a massive overhaul of your data acquisition system. Adaugarea de canale de diferite tipuri ,sau adaugarea diferitelor tipuri de semnal de la sistemul dumneavoastra nu trebuie sa necesite o revizuire masiva a sistemului de achizitie de date. With the right technology, expanding your system should be as simple as plugging in another module. Cu tehnologia dreapta, extinderea sistemului dvs. ar trebui sa fie cat mai simple precum conectarea cu un alt modul.

Bandwidth Latime de banda
In addition to being expandable, a system should also have the bandwidth to handle the data throughput from a high-channel-count system. In afara de a fi expansibil, un sistem ar trebui de asemenea, sa se ocupe de latime de banda de transfer de date de la un sistem high-canal-conta. The bandwidth should also be high enough to accommodate future growth in channel count. Latimea de banda ar trebui sa fie, de asemenea, suficient de mare pentru cresterea in vitor a numarului de canale. System bandwidth is typically expressed in samples/second (Hz). Sistemul de latime de banda este de obicei exprimat in esantioane / secunda (Hz). To determine the minimum necessary bandwidth of the system, you should multiply your total number of expected channels times the maximum sampling rate you will need on an individual channel. Pentru a determina latimea de banda minima necesara a sistemului, trebuie sa va inmultiti numarul total de canale de asteptare ori rata maxima de esantionare ce va fi nevoie pe un canal individual. For a high-channel-count system, the required bandwidth for a modest acquisition rate can quickly reach several hundred kHz. Pentru un sistem high-canal-conta, latimea de banda necesara pentru o rata de achizitie modesta poate ajunge rapid la sute de kHz. Bandwidth is an often overlooked, but extremely important technology to consider when selecting a front-end signal conditioning system. Latime de banda este adesea trecute cu vederea, dar o tehnologie extrem de importanta se ia in considerare la alegerea unui conditionat front-end sistem de semnal.

Software Software-ul
A large portion of the total cost of a test and measurement system is application development. O mare parte din costul total al unui sistem de testare si masurare este dezvoltarea de aplicatii. To keep application development costs to a minimum, you must use software tools that maximize your productivity. Pentru a mentine costurile de dezvoltare de aplicatii la un nivel minim, trebuie sa utilizati instrumente software care va maximinizeaza productivitatea. Your front-end signal conditioning system should be designed to integrate tightly with these software tools. Dvs. de front-end conditionat sistem de semnal ar trebui sa fie proiectat pentru a fi strans compatibil cu aceste instrumente software. Only with the capability to fully control your front-end signal conditioning system from your software application can you take full advantage of the latest technologies in computer-based measurement and automation. Numai cu capacitatea de a controla pe deplin dvs. conditionat front-end signalizare de la aplicatia software veti putea profita din plin de cele mai recente tehnologii de masurare pe calculator si automatizare.

Configuration/Installation De configurare / instalare
Finally, any signal conditioning system you consider should be easy to use. In cele din urma, orice sistem de climatizare semnal pe care le considerati trebuie sa fie usor de utilizat. No one can afford to lose time due to overly complex installation or configuration issues. Nimeni nu poate permite sa piarda timp util pentru instalare prea complexe sau probleme de configurare. An ideal front-end signal conditioning system will poll the hardware, report which equipment you have, and provide you a software interface for setting up all signal conditioning settings. Un ideal front-end sistem de climatizare a semnalului va sonda hardware, echipamente de raport care furnizeaza o interfata software pentru a infiintarea toate setarile de conditionare de semnal. You should be able to configure channels through software, and have the capability to set up channel names and scaling to engineering units.Operatorul ar trebui sa poata sa configureze canale prin intermediul software-ului, si sa aibe capacitatea de a configura nume de canale si scalarea la unitati de inginerie.

National Instruments Signal Conditioning Solutions National Instruments Signal Conditioning Solutions

National Instruments produces a front-end signal conditioning system known as SCXI (Signal Conditioning eXtensions for Instrumentation). National Instruments produce o conditionare front-end de semnal cunoscut sub numele de SCXI (Signal Conditioning extensii pentru Instrumentatie). SCXI is a rugged, modular platform for high-performance signal conditioning. SCXI este o platforma robusta, modulara pentru conditionare de semnal de inalta performanta. An SCXI system consists of multichannel signal conditioning modules installed in one or more rugged chassis. Un sistem SCXI este format din module de conditionare de semnal multicanal instalat intr-unul sau mai multe sasiuri robuste. SCXI offers a wide range of signal conditioning modules -- analog input, analog output, digital I/O, counter/timer, switching, and multiplexing. SCXI ofera o gama larga de module de conditionare semnal - analogic de intrare, iesire analogica, digital I / O, counter / timer, comutare, si multiplexare. To the analog input modules, you can connect an extensive variety of sensors, such as thermocouples, RTDs, thermistors, strain gauges, accelerometers, and LVDTs. Pentru modulele de intrare analogice, puteti conecta o varietate extinsa de senzori, cum ar fi termocupluri, RTD, termistori, transductoarele, accelerometre, si LVDTs. The modules condition the input signals and multiplex them onto the backplane bus of the chassis, where they are typically routed into a data acquisition device to be digitized. Conditia modulelor de semnale de intrare si de multiplicare pe autobuz retur plan a sasiului, in cazul in care acestea sunt dirijate de obicei intr-un dispozitiv de colectare a datelor care urmeaza sa fie digitalizate.

The SCXI architecture has many advantages as a front-end signal conditioning solution. Arhitectura SCXI are multe avantaje ca o solutie de conditionare a semnalului front-end. SCXI incorporates all of the critical technologies necessary to build a high-performance, fully integrated, and easy-to-use front-end signal conditioning system, all at an affordable cost per channel. SCXI incorporeaza toate tehnologiile critice necesare pentru a construi o inalta performanta, complet integrat, sistem de semnalizare si usor de utilizat, front-end conditionat, toate la un cost accesibil pe canal. It is modular and easily expandable, making it ideal for medium to high channel count applications. Este modular si usor extensibile, facandu-l ideal pentru mediu la aplicatii de inalta conta canal. Because it is modular, the SCXI architecture makes it very easy to measure mixed signal types in one system. Deoarece este modular, arhitectura SCXI face foarte usor de masurat tipuri mixte de semnal intr-un singur sistem. SCXI is also a high bandwidth system, capable of multiplexing up to 333 kS/s into a single data acquisition device. SCXI este, de asemenea, un sistem de latime de banda mare, capabil de multiplexare pana la 333 kS / s intr-un singur dispozitiv de achizitie de date. It integrates seamlessly with National Instruments data acquisition devices and timesaving application development software such as LabVIEW and Measurement Studio. Se integreaza perfect cu National Instruments dispozitive de achizitie de date si dezvoltarea de aplicatii software de economie de timp, cum ar fi LabVIEW si Studio de masurare. SCXI modules are shipped with NI-DAQ driver software, which offers easy set up, including autodetection of modules and programmatic modification of settings. Modulele SCXI sunt livrate impreuna cu software de driver NI-DAQ, care ofera usor de configurat, inclusiv autodetectia de module si modificarea programatice de setari. Many SCXI modules now come with both calibration certificates (proving the module is within manufacturer's specifications) and onboard calibration sources (so you can easily calibrate it from software). Multe SCXI module vin acum cu certificate de etalonare atat (care dovedesc modulul este in specificatiile producatorului) si surse de calibrare la bord (astfel incat sa puteti calibra cu usurinta de la software-ul). Finally, with the wide range of options in SCXI modules, you can specify a system that includes signal routing (with matrix switching modules), isolation, filtering, and more. In cele din urma, cu o gama larga de optiuni in module SCXI, aveti posibilitatea sa specificati un sistem care include semnal de rutare (cu module de matrice de comutare), izolarea, filtrare, si mai mult.

The SCXI architecture, first introduced in 1992, has been continually improved through software enhancements and additional modules. Arhitectura SCXI, introdus pentru prima data in 1992, a fost imbunatatit continuu prin imbunatatiri software si module suplimentare. It is now a mature product with the benefit of years of continuous technology enhancements. Acesta este acum un produs matur, cu beneficiul de ani de imbunatatiri tehnologice continue. The SCXI front-end signal conditioning system is used by thousands of customers in a wide variety of applications. SCXI front-end conditionat signalizare este utilizat de mii de clienti intr-o varietate larga de aplicatii.

Conclusions Concluzii

A front-end signal conditioning system should be looked at as a platform that defines the measurement capabilities of your data acquisition system. Un front-end conditionat sistem de semnal ar trebui sa fie privit ca o platforma care defineste capabilitatile de masurare a sistemului de achizitie de date. It is critical to invest in a platform that is both proven by time and constantly improving by incorporating the latest technologies. Este esential sa se investeasca intr-o platforma care este dovedit atat de timp si in mod constant de imbunatatirea incorporeaza cele mai recente tehnologii. The most important technologies to be considered in any front-end data acquisition system are calibration, isolation, bandwidth, expandability, measurement coverage, signal routing, and, of course, ease of use. Cele mai importante tehnologii care urmeaza sa fie luate in considerare in orice sistem de achizitie de front-end sunt date de calibrare, izolarea, latime de banda, de extindere, de acoperire de masurare, de semnal de rutare, si, desigur, usurinta de utilizare. The National Instruments SCXI system is a proven platform that integrates these critical technologies into a full-featured data acquisition system that can meet a broad range of measurement requirements. Sistemul national de Instruments SCXI este o platforma dovedit ca integreaza aceste tehnologii critice intr-un sistem full-featured achizitie de date, care pot satisface o gama larga de cerinte de masurare.

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