DC508A Frequency Range

Gary Robert Bosworth

The DC508A is a 1.3GHz frequency counter. The left-hand side is for high frequencies at 50 Ohms. There is an LED labeled "Input Out Of Range". It lights if the input is not of high enough frequency or of proper voltage. The question is - What is the low end frequency of this input? I believe it requires a minimum of 100MHz at greater than 100mV p-p. Does anyone know for sure if this input will work down below 100MHz and how far down will it work???

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