... measurements 2) Channel A: a) Range: 10Hz to 10MHz direct counter, 1 Features:1) Frequency measurements2) Channel A: a) Range: 10Hz ... to 10MHz direct counter, 10MHz to 100MHz prescaled by proportionb) Resolutions: direct counter: 1,10,100Hz switch selectable, presscaled ... ) Impedance: approx. 50 ohmsc) Maximum voltage without damage: 3V Frequency Counter