120MHz Frequency Counter   Model FC120
  
     
 
Features  
  • Micro-Controller Based Design
  • Self Test for Diagnosis
  • Reciprocal Counting for High Resolution at Low Frequencies
  • 8 Digits 0.5" LED Display
  • Frequency, Period, Totalize & RPM Functions
  • Wide Frequency Range 0.1Hz to 120MHz
  • High Sensitivity
  • Low Pass Filter for Noisy Low Frequency Input
  • 20dB Input Attenuator
  • Display Hold Facility
  • Hardware Reset Control
  • 5PPM High Stability TCXO Time base

Technical Specifications 
Frequency Range 0.1 Hz to 120MHz.
Display 8 Digit 0.5" LED Display.
Gate Time 10mS, 100mS, 1Sec, 10Sec selectable.
Accuracy ± (resolution ± time base error).
Channel A  
Frequency Range DC coupled 0.1 Hz to 120MHz
AC coupled 30Hz to 120MHz.
Input Impedance 1Mohm || 50pF.
Sensitivity <50mVrms (15mVrms typically).
Max. Input Voltage 100V DC or 100V rms at 400Hz falling to 10V rms at 1MHz.
Coupling AC or DC switchable.
Filter 100KHz LPF, switchable.
Attenuator 0 & 20dB, switchable.
Resolution 100nHz to 10Hz (7 digit on 1Sec Gate Time).
Period Range 10nS to 100S (at least 7 digits displayed for per Sec Gate Time).
RPM Range 0.6 RPM to 7200x106 RPM.
Totalizer 0.1Hz to 10MHz.
Totalizer Range 99999999 max.
Time Base  
Frequency 10MHz.
Aging Rate ±1PPM per month.
Temp Stability ±5PPM 23ºC ±5ºC.
Line Variation ±0.05PPM for ±10% variation.
Power Source 115V / 230V ±10%, 50 / 60 Hz AC.
 

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