How does the system Validyne pressure transducer --> Validyne CD280-Dual--> SCB-68--> PCI-6024E--> LABVIEW work and how can we calibrate the pressure transducer?

[hvo]

Hello there,

I am completely new to the LABVIEW software.

I am learning an existing LABVIEW code of my pressure acquisition system (attached) which has the data path as following: Validyne pressure transducer --> Validyne CD280-Dual--> SCB-68--> PCI-6024E--> LABVIEW and I have some question:

1. How does the complete system from transducer to the LABVIEW work? ie if we apply the pressure at the transducer, it will change the resistance of the transducer then ....?

2. How can I find the equation which express the relationship between the pressure and the voltage at the oupt of the Validyne CD280-Dual in the LABVIEW?

3. If I want to do the calibration for the transducer, what are steps?

Thanks,

[altenbach · Accepted solution]

You did not include most of the subVIs.

[hvo]

Hello there,

I do not understand what subVIs you are refering to but I have tried to run the LABVIEW program using the files I attached and it worked fine (pls see the attached pressure plot).

As I mentined before, I am new to LABVIEW so maybe I do not know.

Thanks,

[altenbach]

I don't have anything DAQ related installed, so quite a few VIs are missing here (e.g. channel string to name, create data string, multiple time delay match).

I also don't see any scaling and calibration tools. From what I can tell, all it does is record to a chart and log to a file.

[hvo]

Hello Knight of NI,

Thanks a lot.

But can you pls help me to understand:

1. How does the complete system from transducer to the LABVIEW work? ie if we apply the pressure at the transducer, it will change the resistance of the transducer then ....?

2. How can I find the equation which express the relationship between the pressure and the voltage at the output of the Validyne CD280-Dual in the LABVIEW?

3. If I want to do the calibration for the transducer, what are steps? I can use LABVIEW as a pressure reading device only and use a precise digital gauge in parallel with the pressure transducer and make a table of real reading - apparent reading and get the relationship between the real reading - apparent reading in Excel.

Regards,

[Ben]

THe Vaidyne pressure transducer I have used are simply a strain guage fixed to a diaphram. They are just like any other strain guage that that returns micro volts out/ volts applied. Search on strain guages to learn more.

I use NI signal conditioning for strain guages since they handle the excitation and have buil-in null circuitry.

Scaling is straight froward since the ones I used where linear within thier specified range.

I hope that helps,

Ben