The Systron-Donner Model 6016 Frequency Counter automatically measures continuous-wave (CW) and amplitude-modulated (AM) frequencies from 20 Hz to 18 GHz. The ACTO* (Automatic Computing Transfer Oscillator) technique is used in this counter which eliminates any calculations or adjustments by the operator when measuring microwave inputs. A single BNC input connector accepts frequencies from 20 Hz to 200 MHz with 10 mV rms sensitivity and 1 Mft input impedance. Frequencies from 200 MHz to 18 GHz are applied to the type "N" connector; and, one of two ranges, 200 MHz to 3 GHz or 3 GHz to 18 GHz, can be selected from the front panel or via remote input. A wide choice of high-stability oscillators, complete remote programming, and BCD output are a few of the standard options available.