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FS, ZS voltage

Discussion in 'Electronic Basics' started by Wong, Oct 23, 2003.

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  1. Wong

    Wong Guest

    Hi,
    Output voltage = Full scale voltage - Zero scale voltage.
    Is the term Full scale means no load is connected and Zero scale
    means a load is connected (opened), so output will be the difference
    of these two ?
    TIA.
     
  2. To me the term "Full scale voltage" means that the voltage is being measured
    with an instrument that reads "Full scale" ie. measuring 10volts with a
    voltmeter that is graduated 0-10v, the needle would then be "Full scale" at
    the end of the range.
    Are you becoming confused with 'voltage gain' or something. I feel that you
    may not be expressing your thoughts correctly due perhaps, to a language
    problem ??
     
  3. John Fortier

    John Fortier Guest

    What circumstances are you asking about here. This sounds a bit like a
    question about transmision line impedance measurement, but the names you use
    are unfamiliar in that context.

    Perhaps you could write back with a slightly more detailed descriptionof
    your problem and we'll do our best to answer you.

    John
     
  4. I have seen these terms used only in reference ot a voltage
    measurement process. For instance, an analog to digital converter
    measures a voltage by comparing it to that produced by a programmable
    voltage divider connected between two reference voltages, full scale
    and zero scale. If the measured voltage is equal to or greater than
    the full scale reference voltage, the measurement indicates 100% of
    the full scale digital value needed to program the divider to select
    the full scale reference. If the measured value is half way between
    the full scale reference and the zero scale reference, then the
    measurement result is a digital value 50% of the way between zero and
    full scale. Etc.

    On many of the PIC microprocessors, you have the option to connect the
    full scale and zero scale terminals of the divider to either the
    supply rails (to measure 0 to 100% of output over that range of
    voltages) or to connect either or both to some other reference
    voltages (to narrow the span of the measurement range to increase the
    precision when the input voltage is known to fall between narrower
    limits).
     
  5. Wong

    Wong Guest

    John,
    I am measuring the composite video signal output. As indicated in
    the spec, the output voltage (peak to peak) is equal to FS voltage
    minus ZS voltage. Since I don't really understand these two terms, so
    I am doubt on the accuracy of my measurement. Please let me know if
    you understand this.
    Thanks a lot.

    Wong
     
  6. This sounds like FS is the most positive peak voltage and ZS is the
    most negative peak voltage.
     
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