how can i measure instantane​ous voltage of an anlog waveform in labview

[vanaddana]

Posts: 2

0 Kudos

Hi, All

I am new with LABVIEW need help urgently, and want to plot the stirling engine cycle PV graph, I have mounted suitable hardwares to the engine, pressure sensor with range of (0v-to5v) and position metet of range(0v-to10v) I  have aquired both pressure and volume signals  by DAQ assistant and BNC 2110. they are smoothly like sinusoidal waveform. How can I divide and measure at least 20 instantaneous voltage in one cycle and record the obtained data in two arrays for feeding XY graph wave form??. I have attached a simulation of idea for clarification.

please attach your suggested code if you can.

Regards.

[vanaddana]

Hi, All

I am new with LABVIEW need help urgently, and want to plot the stirling engine cycle PV graph, I have mounted suitable hardwares to the engine, pressure sensor with range of (0v-to5v) and position metet of range(0v-to10v) I  have aquired both pressure and volume signals  by DAQ assistant and BNC 2110. they are smoothly like sinusoidal waveform. How can I divide and measure at least 20 instantaneous voltage in one cycle and record the obtained data in two arrays for feeding XY graph wave form??. I have attached a simulation of idea for clarification.

please attach your suggested code if you can.

Regards.

[danil33]

sorry for interfering...how the kudos symbol came twice???

[vanaddana]

Hello,

I am too new with this webpage and dont know the rules yet, I am just seeking for help.

Regards.

[johnsold]

What is your question? 

Your example has twenty data samples in what appears to be a cycle (plus one which is probably in the next cycle).  It is in two arrays.  You display it in an XY graph.

This seems to meet all the requirements you listed.  Please explain what you want from us.

Lynn

[vanaddana]

Hi, Lynn

 I want to plot the stirling engine cycle PV graph, I have mounted suitable hardwares to the engine, pressure sensor with range of (0v-to5v) and position metet of range(0v-to10v) I  have aquired both pressure and volume signals  by DAQ assistant and BNC 2110. they are smoothly like sinusoidal waveform. MY QUESTION IS; How can I  measure at least 20 instantaneous voltage in one cycle and record the obtained data in two arrays for feeding XY graph wave form??. I tried too much but i cannot measure them simultaneously, as you know i need each instant volume and its correspondent pressure at a time, I have attached a simulation of idea for clarification.

please attach suitable code for me.

Regards.

[johnsold]

Please post the VI where you tried to make the measurements.  Your simulation does nothing to explain why your measurements are not what you need.

What DAQ device are you using? Most inexpensive devices use a mutliplexed A/D converter and do not make truly simultaneous measurements on multiple channels.  However, the time difference may be small enough that the error introduced by the delay may be acceptable.

What is your maximum engine speed (and minimum)? Do you need to have exactly 20 samples per cycle or is that just the minimum? Do you have any kind of encoder or cycle sensor which can tell when a cycle starts?

Do not expect anyone to develop code of you. We will try to help you understand how to use LV so you can do it yourself.  If you wish to pay someone to develop the code, please post on the LV Job Openings Board.

Lynn

[josy]

Hi Danil,

            I clicked the kudos(extra one) that you pointed out in your post but it is not working.