Nrhiav qhov chaw teeb tsa ntawm 3 thiab 9 teev (180° sib npaug) raws li qhia hauv daim duab 3.1.
Ob lub transducers hu ua A thiab B transducer, A yog transmitter xa thiab B yog receiver transducer, lawv yuav tsum tau teeb tsa 180 ° symmetrically kom muaj qhov ntsuas tseeb dua, raws li qhia hauv daim duab 3.1.
Tag nrho cov transducers muaj tus lej Serial sib raug rau transmitter Serial Numbe
Lub sijhawm tshaj tawm: Kaum Ib Hlis-07-2022