Frequency counter model 530 is a high performance 8 digit  LED  Counter / Timer  having  high  sensitivity, automatically placed decimal point,unit indicator,controlled crystal indicator etc.It has a  3 position attenuator and permits counting and timing measurements over a wide range.

  Freq. Range    :  1Hz to 10MHz
  Sensitivity      :  40mV rms for Sine Wave,  100mV p-p for pulsed wave with
                           min.pulse width of 100nSec.
  Accuracy        :  +1digit + time base error
  Time period measurement  :  400nSec to 10 Sec
  Time interval measurement  :  100nSec to 10 Sec
  Display          :  8 Digit

 Frequency counter model 530 is a high performance  8 digit  LED  Counter / Timer  having  high  sensitivity, automatically placed decimal point,unit indicator,controlled crystal indicator etc.It has a  3 position attenuator and permits counting and timing measurements over a wide range.
  Freq. Range    :  1Hz to 50MHz
  Sensitivity      :  40mV rms for Sine Wave,  100mV p-p for pulsed wave with
                           min.  pulse width of 100nSec.
  Accuracy       :  +1digit + time base error
  Time periodmeasurement   :  400nSec to 10 Sec
  Time interval measurement  :  100nSec to 10 Sec
  Display          :  8 Digit

 Frequency counter model 548 is a high performance 8 digit LED  Counter having high sensitivity, automatically placed decimal point,unit indicator,controlled crystal indicator etc.

  Freq. Range    :  20Hz to 600 MHz
  Sensitivity      :  10mV rms
  Accuracy       :  +1 Count + time base error
  Time period  resolution  :  100nSec
  Operating Conditions    : 230Volts + 10%,50Hz single phase
  Display          :  8 Digit LED Display