TTi - Frequency counters

TF930 / TF960

The TF930 and TF960 are a high quality bench universal frequency counter, which offers period measurements, frequency ratio, pulse width and event counting.
They use a high quality temperature compensated internal frequency reference (TCXO) which has a low aging rate and is stable to within 1ppm over the full temperature range. Its short warm-up time allows accurate measurements to be made even under portable battery powered conditions. An External Reference input is provided and changeover from the internal timebase is automatic when an external reference standard is connected. 

For frequency, period and frequency ratio functions the instrument uses a reciprocal counting technique to provide high resolution at all frequencies. Eight significant digits of answer are produced in a 1 second measurement time, nine digits in 10s and ten digits in 100s with a granularity of less than 2 counts in the least significant digit.


  • 0.001Hz to > 3000MHz or 6000MHz frequency range
  • Frequency, period, pulse width, duty cycle, frequency ratio and event counting modes
  • High performance temperature compensated timebase
  • Reciprocal measurement technique gives superior resolution
  • High input sensitivity over the full frequency range
  • High impedance DC coupled input up to 125MHz
  • Variable trigger threshold and switchable attenuator
  • Large 10 digit LCD display with annunciators
  • Operation from built-in rechargeable batteries
  • Low power consumption gives up to 24 hours operation
  • Remote control and readback via USB interface


The PFM3000 is the latest handheld frequency counter and offers high sensitivity frequency measurement from 3Hz to more than 3GHz in two overlapping ranges. Period measurement is also provided from 8ns to 330ms. The PFM3000 uses a continuous reciprocal measurement technique to provide high resolution at all frequencies with rapid update. It offers high sensitivity across the whole frequency range. A low pass filter can be selected to reduce high frequency signal noise at lower frequencies. A Large and clear display Despite its compact dimensions, the PFM3000 incorporates a large 8.5 digit LCD. Annunciators are provided for measurement function, measurement time, overflow, trigger activity, low battery, and measurement units.


  • 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 measurement technique gives superior resolution
  • Period measurement from 3 Hz to 125 MHz
  • Selectable measurement time; display hold function
  • Noise filter for low frequency measurements
  • Large 8.5 digit display with full range of annunciators
  • Battery operation; handheld format with tilt-stand
  • Push-to-measure function with auto power-down