Can the phone be detected by the device after it is switched off?
When the mobile phone is off, the electronic detection instrument can not be detected.
The evolution and development of its overall expansion along two main lines, one is from the technical point of view, through the development process of analog instrument, digital instrument, intelligent instrument; the two is from the structure of the instrument (scalability) and the realization form, has developed a single instrument module of the instrument and virtual instrument. But no matter how the final instrument development, any instrument measurement system includes three functional modules: the signal acquisition module (including sensor circuit, signal conditioning circuit) module, signal analysis and processing module, and the output results.
The basic technology of general electronic measuring instruments is microelectronic technology, digital signal processing (DSP) technology and computer technology.
