Tektronix CMC250 Overview Overview This Counter measures frequency of sine,square and triangle waves from 5Hz to 1.3MGz. This unit also provides period measurements and totalize functions. Channel A is a standard 1Mohm input for frequency measurements up to 100MHz. Channel B is a special 50ohms terminated input, prescaled to 1.3MHz for easy RF measurements. The time stability is +- 10ppm/yr. Specifications: Min. Frequency: 5Hz Max. Frequency: 1.3GHz Measurements: Frequency, Period, Count totalization Key Points: Min. Frequency of 5Hz Max. Frequency of 1.3GHz Measurements of Frequency, Period, Count totalization