PFM3000英国tti手持式频率计的技术说明：
3 Hz to 3000 MHz in two overlapping ranges
High input sensitivity over the full frequency range
High impedance measurement up to 125 MHz

PFM3000 - 3GHz Hand-held Frequency Counter

  3 Hz to 3000 MHz in two overlapping ranges
  High input sensitivity over the full frequency range
  High impedance measurement up to 125 MHz
  Reciprocal counting technique gives superior resolution
  Period measurement from 3 Hz to 125 MHz
  Battery operation and lightweight, handheld format
  Push-to-measure function with auto power-down
  Large 8.5 digit display with full range of annunciators
  Selectable measurement time; display hold function
  Noise filter for low frequency measurements