ɪn ˈɔːɹdɚ tə fˈɪltɚɹ ˈaʊt ðə kˈɑːmən ᵻvˈɛnts sˌoʊ ðə dɪtˈɛktɚɹ ɪz nˌɑːt ˌoʊvɚwˈɛlmd, ðɪ ᵻlˈɛktɹɑːnz mˈʌst pˈæs θɹuː ɐn ᵻlˈɛktɹɪk pətˈɛnʃəl ðæt stˈɑːps ˈɔːl ᵻlˈɛktɹɑːnz bᵻlˌoʊ ɐ sˈɜːʔn̩ θɹˈɛʃoʊld, wˌɪtʃ ɪz sˈɛt ɐ fjˈuː ˈiː vˈiː bᵻlˌoʊ ðə tˈoʊɾəl ˈɛnɚdʒi lˈɪmɪt.
In order to filter out the common events so the detector is not overwhelmed, the electrons must pass through an electric potential that stops all electrons below a certain threshold, which is set a few eV below the total energy limit.