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Portable People Meter - Wikipedia

    https://en.wikipedia.org/wiki/Portable_People_Meter
    The Portable People Meter (PPM), also known as Nielsen Meter, is a system developed by Arbitron (now Nielsen Audio) to measure how many people are …

PPM - Wikipedia

    https://en.wikipedia.org/wiki/PPM
    PPM (Pay per 1000 impressions) Other uses in science and technology. Parts per million, ppm Carbon dioxide in Earth's atmosphere, CO2 ppm; Peak programme meter, measuring audio level; PPM Star Catalogue of 378,910 stars; Proton precession magnetometer, measures small magnetic field variations; Pulse-position modulation of a signal. Other uses

百萬分率 - 维基百科,自由的百科全书

    https://zh.wikipedia.org/wiki/%E7%99%BE%E8%90%AC%E5%88%86%E7%8E%87
    百萬分率(英語: parts per million ,缩写作 ppm ),定義為百萬分之一,1ppm即是一百萬分之一。. 例子: 一公斤(kg)的物質中有一毫克(mg)的某物質,某物質含量即為1ppm;; 一公升(L)的溶液中有一微升(μl)的某物質,某物質含量即為1ppm;; 一公升(L)的溶液中有某物質一毫克,某物質含量即為 ...

Nielsen Audio DA120A PPM 360 Meter User Manual DA120

    https://usermanual.wiki/Nielsen-Audio/DA120A/info
    When the power supply is connected to the Cradle, the meter is placed into the Cradle in order to recharge the Meter. Meter Accessory item: Adapter Alternate equipment item: Model HP110 Nielsen Audio PPM 360 Collector The Models DA120A PPM 360™ Meter is a device that is worn or carried on a person, usually by means of a belt clip.

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