How to get virtual TED file for a sensor?

[VckdVj]

Hi All,

I am trying to use a full-bridge load cell MLP-50. The manufacturer says that it is teds rated but doesn't have a file. How to either create or find teds file for a specific load cell?

Thanks in Advance,

VckdVj

[GerdW]

Hi VckdVj,

it's in an EEPROM…

[VckdVj]

So, how does it effect in this case? Please elaborate. 

[VckdVj]

My understanding is that, EEPROM is the memory where TEDS data is already there. Please correct me if I am wrong.

[GerdW]

Hi VckdVj,

see Wikipedia.

TEDS is stored in the sensor itself using those EEPROM (or other similar devices).

[VckdVj]

Thanks for the reply.

What should I do to make it work with LabVIEW?

I am able to see the voltage change with respect to load but, no idea how much change corresponds to the load. Could you please let me know what should I do to go ahead with LabVIEW.

[GerdW]

Hi VckdVj,

I am able to see the voltage change with respect to load but, no idea how much change corresponds to the load.

What about reading the specifications?

See here: 2mV/V rated output with a recommended excitation voltage of 10V! After all it's just a full-bridge sensor…

What should I do to make it work with LabVIEW?

Read the sensor output voltage signal and apply scaling according to specifications…

[CFER_STS]

TEDS data for TEDS-enabled instruments is typically stored on an EEPROM chip which is integral to the instrument or its cabling.  Virtual TEDS data is transducer information in exactly the same format as hardware TEDS, but just stored in a file read by software.  IEEE 1454.1 TEDS templates are included as a library with LabVIEW, but this only specifies the format for parsing TEDS information.  If you want to create a virtual TEDS file, you need to determine all of the transducer information, calibration data, etc., and then create the virtual TEDS file for it according to the template.  If the instrument (load cell, etc.) is already TEDS capable (i.e. has TEDS data encoded on an EEPROM chip), you just need to read the TEDS information with a combination of TEDS-enabled signal conditioning hardware, and software code to parse the data.  The snippet below is an example of code I use on a cRIO-9030 CompactRIO controller to read TEDS data from a couple of pressure transducers using a NI 9237 signal conditioning module.