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WEBENCH® Tools/MSP430FR6047: error is “No signal detected in up and downstream channel”

user6008579
Prodigy 30 points
Part Number: MSP430FR6047

Tool/software: WEBENCH® Design Tools

hello ！

hardware:MSP430FR6047 Ultrasonic Sensing Evaluation Module

software:CCS9.0.1,  USS_02_20_00_15

The most common error is “No signal detected in up and downstream channel”. This error usually has one of two root causes:

  • The strength of the signal being read into the USS algorithm with the current configuration is too low to use
  • The meter is currently disconnected

I‘m sure The meter is currently connected,May be The strength of the signal is too low.

My application scenario is to measure the velocity of the infusion line from outside the tube,The ultrasonic probe manufacturer says the probe should not be used for flow measurement outside the tube.

Therefore, I would like to know whether there is a suitable ultrasonic probe suitable for my application scene, can you recommend it?

  • 0
    TI__Expert 5490 points

    Hello,

    Thanks for your posting, I have contacted our Ultrasonic expert to look into this for you.

    Thanks,

    Yiding 

  • 0 in reply to Yiding Luo
    TI__Mastermind 43730 points

    Hello,

    For clamp on metering, the transducer selection will be important.  Typically, transducers with a ~45 degree face are used.  It is also important that you use some type of couplant between the transducer face and tube.  Last, you need to be sure that you have the tube completely filled with water or the signal will be attenuated too much and no signal will be received by the receiving transducer.  See my post below which described some of my clamp on testing.  I do notice one error in my post though.  I mention that the transducers I tested are from Audiowell, but they are actually Jiakang PSC1.0M022302H2AD0-B0 transducers.  In the picture you show, there is too much air between the transducers and tube which is causing the attenuation.  The transducers that you show would likely see a signal if you were to submerge both in water and face towards each other, but for clamp on I recommend something with an angled face intended for clamp on metering. 

    http://e2e.ti.com/support/microcontrollers/msp430/f/166/p/818315/3031313#3031313  

  • 0 in reply to Eddie LaCost
    TI__Intellectual 2100 points

    Hello,

    the 'FR6047 target applications are utility flow maters and associated applications. In those applications the ultrasonic transducer is in direct contact with the liquid medium. On those you've got  the oscillating piezo disc with its mass that emits the thickness oscillation via a membrane into the non-compressible liquid.  The coupling of ultrasound into the medium is good. On the reception side you've got the same coupling in reverse order. Picking up the sound pressure level by the receiving transducer give you some reasonable values.   A good flow meter of that type has a channel attenuation of 10dB ... 20dB.

    From your photo I see that you are trying to develop your own hydraulic system. You are coupling from the oscillating face of the transducer to air, then from air into a plastic hose then into the medium. These are too many coupling obstacles to begin with; even if you select max amplification.

    My proposal is to try a simpler setup and work from safe grounds.

    Use a thicker hose, maybe 1-2"; Fill it with water, plug in the transducers on both sides and enjoy the signal curvatures that you can see.

    Then think how you can let some water flow e.g. by drilling a small hole on each side of the 1-2" hose and then use a thinner hose e.g that one of the  photo and let the water flow...     

    below some ideas ...

    try it its fun

         Johann