EZ Digital OS-5060A, Operation Manual

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2-3-3. Frequency Measurement
When a precise determination of frequency is needed, a frequency counter is
obviously the first choice. A counter can be connected to the CH-1 OUTPUT connector
(20) for convenience when both scope and counter are used. However, an oscilloscope
alone can be used to measure frequency when a counter is not available, or modulation
and/or noise makes a counter unusable.
Frequency is the reciprocal of period. Simply measure the period “t” of the
unknown signal as instructed in 2-4-2 Time Interval Measurements, and calculate the
frequency “f” using the formula f = 1/t. If a calculator is available, simply enter the
period and press the 1/x key. Period in seconds (s) yields frequency in Hertz(Hz) ;
period in millisecond(ms) yields frequency in kilohertz (kHz) ; period in microseconds
(us) yields frequency in megahertz (MHz). The accuracy of this technique is limited by
the timebase calibration accuracy (see Table of Specification.)
Free Datasheet http://www.datasheet4u.com/