Ionizacijski merilniki na hladno katodo so razelektritvene cevi, vendar ne povsem navadne; kajti dodano imajo magnetno polje, ki ga ustvarja zunanji magnet. Pri standardnih takih ceveh se tok zmanjša ...na nič že pri tlakih ▫$10^{-3} mbar, pri merilnih elektronkah z magnetnim poljem pa zaradi podaljšane poti elektronov lahko ionizacijo prisotnih plinskih molekul vzdržujemo tudi še pri dosti nižjih tlakih. Obstoja več izvedb vakuumskih merilnih sond na hladno katodo, s katerimi se da meriti tlak med 10^3 do 10{-6] mbar, z njihovimi izboljšanimi izpeljankami celo do 10[-8]mbar. Prispevek podaja osnove delovanja, tipe sodobnih tovrstnih merilnikov in predstavi našo prototipno izvedbo.$▫
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