Agilent/HP / Universal Counter / 5335A 
DC coupled, 0 to 100 MHz.
AC 1 Mohm, 30 Hz to 100 MHz.
AC 50 ohm, 200 kHz to 100 MHz.
Note: Channel A range 200 MHz when in Frequency A and Ratio modes.
Sensitivity (×1):
25 mV rms sine wave.
75 mV peak-to-peak pulse at minimum pulse width of 5 ns.
Dynamic Range (×1):
75 mV to 5V peak-to-peak, to 100 MHz.
75 mV to 2.5V peak-to-peak, >100 MHz