• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 31 subscribers
  • Views 346 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

PGA970: Connecting multiple PGA970 to the same RVDT

Tucker Johnson
Prodigy 10 points
Part Number: PGA970

Hi! Odd question here. Our application of PGA970 has multiple PGA970 that read data from 6-wire RVDT's.

If the Excitation (primary windings, P1/P2) of a single PGA970 is wired to a RVDT/LVDT, and then the secondary windings(S1P/S1N/S2P/S2N) connected to three PGA970 in parallel, would each of the PGA970 be able to accurately read the position of the RVDT? (assuming the three PGA970 were configured the same)

Thanks,
Tucker

  • 0
    TI__Guru** 113765 points

    HI Tucker,

    Welcome to the E2E forum!  Just so that I'm clear about what you are asking, are you wanting to use a single RVDT and send the secondary output to 3 different sets of secondary inputs?  Maybe drawing up a simple block diagram of what you want to do would be of help.

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    Prodigy 10 points

    Yup, I think you understand correctly. 

    Regardless, good idea to draw a block diagram for clarity, here's one drawn up with a LVDT.

  • +1 in reply to Tucker Johnson
    TI__Guru** 113765 points

    Hi Tucker,

    If all three PGA970 are configured the same, and as long as there is not a significant difference in reference voltages or phase differences from one device to the next at the input, you should be able to see similar magnitudes.  This also assumes that you can capture the data in a reasonably synchronized way, and there is not significant loading on the secondary.  

    As to the phase, the calculation is based on the waveform generator output.  So this will only really work on the device providing the waveform.

    In the end I think the results will not be less than desirable.

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    Prodigy 10 points

    Great! thanks for the detailed answer