DAQ and PNA

[2121]

     How can i use the PNA E8361C to analyze the data taken by the DAQ NI-6259 BNC by using LabView. My NI-6259 BNC can take  voltage mesurement using LabVIEW and after taking this data i want to analyze in the vector network analyzer E8361C. Is there any way i can do that.

 Thank You.

[Dennis_Knutson]

That does not make any sense. The vector analyzer can acquire an external signal and analyze it. The 6259 can acquire an external signal and analyze it. If you want to use the vector analyzer, then there is no point in having the 6259 capture the signal. If you want to use the 6259 to capture the signal, then you would use functions in LabVIEW to analyze it.

[Aaron_W.]

2121,

Thanks for posting on the forums!

If you could it would be helpful to go into more detail about what you are trying to do with your 6259. If you are acquiring signals with your 6259 and basically using these as a feedthrough module for your VNA, it might be possible but your signal integrity is going to take a pretty big hit depending on what signals you are trying to acquire. If you could provide more information I would appreciate it. Thanks!

[2121]

Thanks for the reply.

   We are trying to use the output voltage  of the NI 6259 BNC to power the pump Aquatech Co. Ltd. The output voltage of DAQ NI 6259 should be controlled by labview. We then want to analyze the pump data in the Vector Network Analyzer using Labview. Do you think it is possible.

 Thank You

[Dennis_Knutson]

Connect an output of the 6259 to the voltage input of the pump. You can easily control this. If the pump has an output that is different than the power input of the pump, connect this to the network analyzer. If there is not a separate output, I have no idea what you would be analyzing since the output of the 6259 would be the same whether you had the pump connected or disconnected.

You should really draw a system architecture to show everyone what you need to do. It's also important to specify what type of analysis you intend on doing.

[2121]

               I have Miniature peristaltic pump (http://www.dolomite-microfluidics.com/miniature_peristaltic_pump.pdf). It is connected to the DAQ Ni 6259 BNC which supply the voltage for the pump operation.  There are two tube of the pump, and one has oil in it. Both the tube is connected to the microstrip filter. From one tube the oil flow into the filter and from another tube the oil comes out. And if i can control the voltage coming out of the DAQ NI 6259 i can control the flow of the oil and it's influence in the filter. I later want to save the data in my pc of the flow of the oil in the filter. So that i can analyze the data in the vector network analyzer E8361C.  Is there any way i can do that? How should i write the code for this?

   Thank you

[Dennis_Knutson]

Are you actually monitoring the flow? With what kind of sensor? You need something to convert that flow to a voltage so that you can connect some sort of instrument to it. Offhand, it seems like the vector signal analyer is the wrong instrument but that's up to you and the type of analysis you want to do. Personally, I would use an analog input of the 6259 to connect to the sensor.

[2121]

     Thanks,

             We are actually trying to control and measure the output voltage of Ni 6259 BNC. i.e the input voltage to the pump.  Can we measure and control the output voltage of the DAQ? The pump do not have any sensor in it. It just has a input terminal and the tube.Can we either measure the resistance or the current flowing to the pump so we can calculate the flow in pump. If not,we will be using odometer to measure the resistance. At the end of this experiment we are trying to save the data so we can analyze it in the Vector network analyzer. Or is there any way using labview we can send data directly to labview 8.6.

 Thank You

[Dennis_Knutson]

You can directly control the output voltage of the 6259 by setting the input of the DAQmx Write to whatever you need to set it to. There is no need to measure it since you are generating it in your program. If you program it to ouput +3 volts, that is what it will output. Every value that you write, can be saved in the LabVIEW program. You can measure the current if you use a resistor shunt and an analog input channel. You would then have both sets of parameters in the LabVIEW program and could do your analysis there. The only way I know to get the information into the vector signal analyzer would be to connect it to the same place on the pump that you have connected the 6259 output. I have no idea how you could get the current measurement into the analyzer. Also, you use an ohmeter to measure resistance - not an odometer.

If you want to do all of the analysis in LabVIEW, please explain what the analysis will consist of. If you want to do the analaysis in the vector signal analyzer, then you need to study the manual, determine if you can load external files for analyis, and then how to perform the analysis. These questions about the analyzer should be refered to the vendor of the isntrument. It's not really a LabVIEW issue.

[ColeTrain]

Hello 2121, 

If I had to fathom a guess, I'd wager that you are doing this experiment in a lab type setting where precise measurements are important and you need to be able to propagate your errors.  The best way to do this would be like Dennis suggested and record the values you are writing to your pump to a file to be analyzed later.  If you want to know the exact error of your output, you can find it in the manual.  The AO Accuracy table is on page 6. 

Also, like Dennis asked, are there any external sensors in your setup or is everything done visually (through microscopes with cameras)?  If you have a sensor that you are reading in, you can record the times that you make any changes and correspond that sensor readings.

Hope this helps!