Talk 3: Spectrum Analyzer Detection Modes

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  • เผยแพร่เมื่อ 3 ก.พ. 2025

ความคิดเห็น • 11

  • @shih-haowang4788
    @shih-haowang4788 3 ปีที่แล้ว

    This is so instructive for learning how spectral analyzer works and how to start to use it. Also interesting demonstration with microwave oven and radar. Thanks for uploading the great contents

  • @drwagner14
    @drwagner14 ปีที่แล้ว

    Super useful, thank you!

  • @Dickwooten
    @Dickwooten ปีที่แล้ว

    Much appreciated!

  • @YouveBeenCabadged
    @YouveBeenCabadged 3 ปีที่แล้ว

    Thanks! This is great.

  • @lunarjournal
    @lunarjournal ปีที่แล้ว

    23:27 @NTIAGov I think there is a mistake when the instructor said that the values for Xi represent power?. In most spectrum analyzer user manuals i've come across the RMS detector mode uses the signal voltage for Xi. Thus effectively calculating RMS voltage which can then be converted into average power given a reference impedance. If Xi represented power, you would be calculating RMS power not average power. Someone correct me if I am wrong.

    • @institutefortelecommunicat1216
      @institutefortelecommunicat1216 ปีที่แล้ว

      Hello. This is the reply from Frank Sanders, via the Publications Office at the Institute for Telecommunication Sciences (ITS).
      The machines ordinarily measure power (voltage squared). They do not do ordinarily a direct voltage measurement. (The exception is a power meter with a bolometer head.) Having measured the input power through a log amp (unless the user has manually selected a linear-amp option-which is rare), the machine divides by 10 and antilogs to get to the voltage. Then they compute the average from multiple samples, and then log the result and multiply by 10 to get back to power.
      Older analog machines could not do this; they did not offer RMS power measurement options. The way they got close to it in the oldedd days was to use a narrow video bandwidth. The newer, digital machines offer the RMS feature described above. But again, it’s not a direct measurement of RMS.

  • @rodericksibelius8472
    @rodericksibelius8472 2 ปีที่แล้ว

    I wonder what model of this Agilent 'Spectrum Analyzer' used in these demonstrations.

  • @karielf8947
    @karielf8947 ปีที่แล้ว

    The notion of bins is not clear ar all for someone like me. Is it in the basé of time when you talk about bin. And what is the relation ship with frequency step, and rbw???

  • @donaldviszneki8251
    @donaldviszneki8251 3 ปีที่แล้ว

    I am skeptical that all analog spectrum analyzers connect detector output to an ADC. Don't old analog spectrum analyzers with CRT displays amplify the analog detector output and use it to control electron beam deflection in the CRT?
    Thanks for this amazing resource.

  • @zga8
    @zga8 5 ปีที่แล้ว

    Hi not sure I am understand ...at 10:50 , bins plot X axis is the time domain ,or frequency ?