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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.
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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 .
In April 1979, the Easy Listening chart officially became known as Adult Contemporary, and those two words have remained consistent in the name of the chart ever since. In 1996, Billboard created a new chart called Adult Top 40 , which reflects radio station programming that exists somewhere between "adult contemporary" music and "pop" music.