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PGA460: PGA460 USE Bi-static mode，RX floating，there is noise on RX

user6060721
Expert 1015 points
Part Number: PGA460

when we use PGA460 Bi-static mode。

when RX not connect transducer，there is noise listen only。

when RX connect transducer，noise is very low listen only。

when the RX transducer fail(broken？)，we may get wrong distance。

how can we reduce the noise when RX transducer not connected。

Thanks

  • 0
    TI__Mastermind 27940 points

    user6060721,

    When the receiver input is floating (no transducer is connected), the noise will always be higher than when a transducer is connected. You can try adding a fixed resistor in parallel to the transducer (such as 10kOhms) to help minimize the floating RX noise.

    I recommend that you use the PGA460's system diagnostics and noise measurement features to determine if the transducer is properly connected or damaged. For example, before you make a time of flight measurement, perform a noise measurement command to determine if the average noise level is low (<25 out of 255) for when the transducer is connected, or high (>25 out of 255) for when the RX is floating or the transducer is damaged.