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Frequency counter model 539 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 100nS
Accuracy : +1digit + time base error
Time period measurement : 400nSec to 10 Sec
Time interval measurement : 100nSec to 10 Sec
Display : 8 Digit