Medir periodo y frecuencia

hola comunidada NI..
estoy trabajando con las entradas analogicas de una tarjeta sbRIO-9631 para medir la frecuencia de una senal de salida de un anemometro..
les agradeceria su aportre gracias...

"NI comunity hello ..
I am working with analog inputs card sbRIO-9631 to measure the frequency of an output signal of an anemometer .. 
I would appreciate your aportre thanks ..."
 Sebass, las preguntas en castellano te conviene postearlas en la comunidad en español: http://forums.ni.com/t5/La-Comunidad-en-Espa%C3%B1ol/ct-p/ESAForum
what labview version do you have? (professional, developers, etc.)

Similar Messages

  • Multiples senales digitales con diferente periodo y frecuencia

    Hola!
    Estoy escribiendo un codigo que me envie multiples senales digitales con distinto periodo y frecuencia. La idea es que cada senal (ademas de tener distinto periodo y frecuencia respecto al resto de senales), tambien debe ir actualizando su propio periodo y frecuencia. Los valores de periodo y frecuencia los actualizo desde MatLab (mediante MatLab node), porque necesito que sean valores aleatorios de una determinada distribucion de probabilidad.
    He escrito el codigo muy simple para dos senales, en el que mediante un "for loop" y mediante un vector de datos, voy escribiendo los datos del vector para cada paso del loop en el DAQmx. El vector de datos, por filas representa los canales y las columnas representan cada muestra que quiero escribir (0 = 0V, 1=5V). Mediante un elemento "wait" dentro del loop intento controlar el tiempo por iteraci'on dentro del loop. Sin embargo, cuando lo conecto al osciloscopio, una de las senales no funciona, la otra si pero con mucho ruido y la frecuencia que marca el osciloscopio no corresponde con el elemento "wait" que le he puesto.
    Aqui adjunto mi programa por si teneis alguna idea de cual puede ser el problema o nuevas formas de escribir el programa.
    Muchas gracias!!
    Miguel
    p.d: Perdonad por las faltas ortograficas pero no tengo teclado espanol.

    Buen día Mike,
    1. Intenta utilizar la función de "Wait (ms).vi" en vez de Wait untitl next ms multiple.vi""
    2. El tunel de entrada del array al for loop, tiene deshabilitado el autoindexing, por lo qe solo está pasando un valor a la entrada al ejecutar el programa.
    3. Cuando habilites el auto indexing, recuerda que el for loop va a iterar tantas veces como filas tenga el array de 2 dimensiónes (en este caso 2 veces, extrayendo primero toda la primera fila y luego toda la segunda fila), ignorando el valor cableado en "N" si este es mayor al número de filas del array.
    Saludos,
    >>Daniel C.

  • Medir frecuencia cada 1ms

    Hola amigos, estoy utilizando el muldtimetro digital pxi 40-70 para medir frecuencia, ya tengo los vi conectados y configurados con su numero de muestras y numero de puntos para observar la señal, ya he realizado mediciones correectamente. Ahora yo quiero guardar el tiempo de cada periodo en un block de notas, es decir que si estoy midiendo una señal de 100Hz  y realizo la medición durante 2 segundos, espero obtener 200 datos.¿Que VI puedo utilizar para sacar el periodo de cada ciclo que estoy midiendo? y ¿Como puedo guardar esos datos en un block de notas ?
    Saludos
    Muchas Gracias Comunidad NI

    Hola Mrcalcetas.
    Gracias por utilizar los foros de NI. Si ya tienes el valor de la frecuencia lo único que tienes que realizar es la fórmula de: Periodo = 1/frecuencia.
    Te dejo este link que te será de ayuda para como poder realizar la medición de frecuencia y despues aplicar el procedimiento que te comento utilizando el ExpressVI de Tone Measurements:
    http://digital.ni.com/public.nsf/allkb/0A335655A8F​F2C69862570BD0052DFDA
    Con respecto a tu pregunta de cómo poder almacenar la información a un archivo de texto (.txt) lo que puedes realizar es el uso del ExpressVI “Write To Measurement File” para realizar la escritura de manera rápida y sencilla, te dejo este link donde se muestra su uso:
    http://digital.ni.com/public.nsf/allkb/CB46BC11A48​8621E86256D19005A386E
    También puedes realizar la escritura un poco más personalizada con los VIs de bajo nivel (paleta de File I/O dentro de LabVIEW). Te dejo esta liga también y código ejemplo donde se muestra cómo usar estas funciones para añadir texto a un archivo .txt
    http://digital.ni.com/public.nsf/allkb/F55FD21DFEF​0C3C1862571F500023123
    Espero que esta información te sea de utilidad.
    Saludos!
    - Luis C

  • Retardos de ondas cuadrada

    Hola a todos, estoy realizando un programa el cual me permita establecer el retardo entre ondas, para este caso la cuadrada, estoy utilizando el simulador de ondas (express) como square, y el Timing and Transition Measurements para conocer el periodo, duty, frecuencia. Pero al ejecutarlo me sale este error:
    Error -20308 occurred at Timing and Transition Measurements -> analisis
    frec ampl.vi
    :4"  (waveform index 0 of 1)
    Possible reason(s):
    Analysis:  The waveform did not cross the mid reference level enough times
    to perform this measurement. Check the signal length, reference levels, and
    ref level units.
    Estoy trabajando con el Labview 8 y windows XP.
    Si alguien me pudiera colaborar para corregir este error o como poder establecer el retardo entre ondas estaria muy agradecido.
    GRACIAS y envio el programa que hice.....
    Attachments:
    analisis frec ampl.vi ‏193 KB

    Hola, gracias por utilizar el Foro de National Instruments.
    Fíjate que el error que te marca es porque si la señal a la entrada del VI no contiene suficientes bordes para completar la medición entonces genera este error. En este aso simplemente eleva la frecuencia del número de data points de la señal que es pasada a este VI que estas usando.
    Vi tu ejemplo y a partir de 16Hz no tienes problemas, pero mira aquí te mando un ejemplo que te funciona y es más o menos el mismo, que te parece si lo checas y para que no tengas problemas.
    Gracias por utilizar nuestros productos y cualquier cosa que necesites, sube tus dudas al foro.
    Para una respuesta mejor y en español, tenemos un foro especial diseñado en español, por lo que te sugiero que para un mejor servicio en la comunidad de habla hispana usemos ese foro.
    Que tengas un excelente día y te mando un saludo
    NorSa
    AE LATAM
    NorSa
    NI Applications Engineer Latin America
    Para Soporte entra aquí
    Attachments:
    Square_Wave_Measurements[1].vi ‏100 KB

  • Medir la frecuencia de los pulsos cardiacos

    buenas tardes con todos quisiera saber si me pueden ayudar con un proyecto el cual consiste en obtener la frecuencia de los pulsos cardiacos para ellos he podido obtener la forma de onda de la presion sanguinea pero pero no consigo medir la frecuencia de esta onda he intentado con le timing and transition measurent pero no se si estoy usandolo mal o no se puede. si alguine tiene una idea como hacer una programa para hacerlo por favor que me ayude muchas gracias

    Hola patillo!!
    Muchas gracias por utilizar los foros de National Instruments!!  Para poder apoyarte de mejor manera, ¿crees que puedas adjuntar tu código en tu siguiente post?  Asimismo, un archivo de datos que desees analizar sería de mucha ayuda. ¿Qué hardware de NI estas utilizando?
    Existen algunos ejemplos en NI Community que pudieran servirte como base para tu proyecto.  Te dejo algunos:
    How to use NI Biomedical Startup Kit 2.0 - HRV (Heart Rate Variability) Analyzer
    Simple Heart and Respiration Rate Measurement
    Espero que te sirva!
    Saludos!
    Anuar R.
    National Instruments México y Latinoamérica
    Ingeniería de Aplicaciones
    www.ni.com/soporte

  • Medir Flujo

    Hola amigos, estoy haciendo un proyecto el cual consta medir el flujo de agua con Labview y una Ni DAQ, alguien tiene algun programa para poder hacer esto? 
    El sensor que uso lo anexo en una foto, el cable rojo es voltaje, el negro es tierra y el amarillo es señal.
    Necesito poder visualizar los valores en un indicador numerico y en una grafica.

    Saludos danieltuzc,
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    ¿Qué precisión requieres para tu medición?
    ¿Qué dispositivo NI DAQ planeas utilizar?
    Así bien, me tomé la libertad de realizar una búsqueda rápida basado en la imagen encontré que posiblemente se trate de un YF-S201, ¿podrías confirmarnos si este es el modelo de tu sensor? De ser así, lo más parecido que logré encontrar a un datasheet fue este documento. Te pido por favor verifiques que el modelo de tu sensor corresponda con el datasheet.
    Así bien, según dicho documento la salida del sensor es una salida PWM, por lo que tendrás que medir la frecuencia del mismo para poder determinar el flujo que cruza a través del sensor, sin embargo según el documento no se trata de una relación totalmente lineal, por lo que te recomiendo utilizar una escala personalizada del tipo tabla, el documento especifica algunos valores conocidos para el sensor que podrás utilizar en tu escala personalizada.
    Te comparto algunos links que pudiesen serte útil:
    Frequency Measurements: How-To Guide:
    http://www.ni.com/tutorial/7111/en/
    How to Take a Frequency Measurement with an Analog Input Channel:
    http://digital.ni.com/public.nsf/allkb/0A335655A8FF2C69862570BD0052DFDA
    What Are NI-DAQmx Custom Scales, and How Do I Use Them?:
    http://digital.ni.com/public.nsf/allkb/0464919A11C092E386256D800079C3BB
    How Do I Programmatically Create NI-DAQmx Custom Scales in LabVIEW?:
    http://digital.ni.com/public.nsf/allkb/F7DAE47B4408A86F8625765700767FCD
    Custom Scales:
    http://zone.ni.com/reference/en-XX/help/370466V-01/mxcncpts/customscales/
    Nuevamente, te pido nos confirmes si efectivamente este es el modelo de tu sensor, quedo al pendiente, saludos cordiales.
    David P.
    National Instruments
    Applications Engineer
    www.ni.com/soporte

  • Distintas frecuencias de muestreo en el mismo cDAQ.

    Buenas tardes,
    hasta el momento siempre hemos hecho pruebas trabajando con distintos modulos y la misma frecuencia de muestreo, por lo tanto se ha ocupado sólo un while loop y con el asistente DAQ. Ahora necesitamos tomar muestras a distintas frecuencias, dentro del mismo chasis, y aquí surge la duda, como se puede realizar esto?
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    Puedo utilizar distintas frecuencias de muestreo dentro de un modulo NI-9234 o puedo utilizar distintas frecuencias en el mismo cDAQ, pero en diferentes modulos?
    De antemano, muchas gracias.
    Atte.
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    Hola Raúl82:
    La Arquitectura que estás usando actualmente no está mal, pero es bastante básica para cuando quieres hacer mediciones que dependen de variables como el periodo de muestro, el número de muestras por unidad de tiempo, etc.
    Te recomiendo que estudies las funciones de la librería DAQmx. Te adjunto un VI ejemplo que mide una señal de voltaje y una termocupla. Este VI te ayudará a entender como funcionan estos bloques.
    Por medio de estas funciones, puedes crear distintas tareas de medición, que te permitarán configurar mediciones a distintas tasas, número de muestras, etc.
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    Klaus F. Breuer
    Field Applications Engineer
    National Instruments Cono Sur
    ¡Los Kudos son gratis y te hacen feliz!
    Attachments:
    Analog Input - Voltage and Thermocouple in a Single Task.vi ‏78 KB

  • Determinar frecuencia

    Saludos comunidad NI ...tengo la entrada digital de una sb-RIO 9631 lo que necesito es medir la frecuencia de una salida digital de un anemometro...por favor como puedo medir la frecuencia y si me pueden ayudar con el VI muchas gracias.
    Fabian Lalaleo S.
    saludos 

    Hola,
    El siguiente ejemplo de uso cRIO para medir la frecuencia, cómo sbRIO utilizar el mismo código que cRIO puede adaptar este ejemplo a su aplicación.
    The following example use cRIO to measure frequency, how sbRIO use the same code as cRIO you may adapt this example to your application.
    http://zone.ni.com/devzone/cda/epd/p/id/5835
    Cordiales saludos,
    Abel Souza
    Applications engineering
    NI Brazil
    Abel Souza
    Engenheiro de Aplicações
    National Instruments Brasil

  • Medição de Distâncias usando Camera USB

    Estou desenvolvendo um sistema que utiliza medição de distâncias através de análise de imagem. Essas imagens serão providas por uma camera USB. Não possuo o pacote IMAQ Vision e por isso a aquisição da imagem e tratamento dos elementos será feito "na raça". Alguém já fez isso? Conhece alguma aplicação exemplo?

    Eu não conheço Portugese, este texto é traduzido pelo Internet e pode ter erros: Há um excitador disponível de http://www.cs.unc.edu/~parente/labview/index.shtml que permite a captação das imagens das câmeras do USB. Eu usei este eu mesmo criar um VI para capturar imagens para a rede. Pode ser um começo útil para você.

  • Med Rec medrec tutorial 10 deployments-- EJB Modules EJB is not shown

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    Q: Manually built the class files using ‘ant –f build.xml build’ in the physicianEar src dir – but that failed in the acc.split.dir step with class not found /org/apache/struts/action/ActionForm.
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    Hi,
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    TechNet Community Support

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    Occam's Razor nearly always applies when troubleshooting technology issues!
    If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
    Join our BBM Channels
    BSCF General Channel
    PIN: C0001B7B4   Display/Scan Bar Code
    Knowledge Base Updates
    PIN: C0005A9AA   Display/Scan Bar Code

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