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  2. RIGOL Technologies - Wikipedia

    en.wikipedia.org/wiki/RIGOL_Technologies

    RIGOL was founded in Beijing in 1998 and released its first product, a high-performance virtual digital storage oscilloscope, in May 1999. [1]In 2018 the company released the new RSA5000 real-time spectrum analyzer and the MSO7000, as well as MSO5000 series, based on the new ASIC based Ultravision-II platform.

  3. File:Rigol DS1074Z Oscilloscope - back.jpg - Wikipedia

    en.wikipedia.org/wiki/File:Rigol_DS1074Z...

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Pages for logged out editors learn more

  4. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor Franciscus Cornelius Donders .

  5. Hearing range - Wikipedia

    en.wikipedia.org/wiki/Hearing_range

    Logarithmic chart of the hearing ranges of some animals [1] [2] Hearing range describes the frequency range that can be heard by humans or other animals, though it can also refer to the range of levels. The human range is commonly given as 20 to 20,000 Hz, although there is considerable variation between individuals, especially at high ...

  6. ARINC 429 - Wikipedia

    en.wikipedia.org/wiki/ARINC_429

    ARINC 429 is a data transfer standard for aircraft avionics. It uses a self-clocking, self-synchronizing data bus protocol (Tx and Rx are on separate ports). The physical connection wires are twisted pairs carrying balanced differential signaling.

  7. List of viscosities - Wikipedia

    en.wikipedia.org/wiki/List_of_viscosities

    Measured values span several orders of magnitude. Of all fluids, gases have the lowest viscosities, and thick liquids have the highest. The values listed in this article are representative estimates only, as they do not account for measurement uncertainties, variability in material definitions, or non-Newtonian behavior.

  8. Piano key frequencies - Wikipedia

    en.wikipedia.org/wiki/Piano_key_frequencies

    A jump from the lowest semitone to the highest semitone in one octave doubles the frequency (for example, the fifth A is 440 Hz and the sixth A is 880 Hz). The frequency of a pitch is derived by multiplying (ascending) or dividing (descending) the frequency of the previous pitch by the twelfth root of two (approximately 1.059463).

  9. Bristol stool scale - Wikipedia

    en.wikipedia.org/wiki/Bristol_stool_scale

    This is an accepted version of this page This is the latest accepted revision, reviewed on 10 January 2025. Medical system for classifying human faeces Medical diagnostic method Bristol stool scale Bristol stool chart Synonyms Bristol stool chart (BSC); Bristol Stool Scale (BSS); Bristol Stool Form Scale (BSFS or BSF scale); Purpose classify type of feces (diagnostic triad for irritable bowel ...

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