“计频器”常见的英文表达是 “frequency counter” 。
“frequency”意为“频率” ，“counter”有“计数器；计量器”的意思，二者组合就表示用于测量频率的仪器，即“计频器” 。例如：This frequency counter can accurately measure the frequency of electrical signals.（这台计频器能精确测量电信号的频率 。）