# Calculating Frequency

#### darbyrne

Joined Dec 7, 2006
7
Hi all,

Quick question:

A Sine wave completes one cycle in 25 us. What is the Frequency?
what is the calculation used here?

#### Papabravo

Joined Feb 24, 2006
14,461
Hi all,

Quick question:

A Sine wave completes one cycle in 25 us. What is the Frequency?
what is the calculation used here?
Frequency is the reciprocal of the period.
Rich (BB code):
f = (Tp)^-1 = 1 / Tp

1 / 25e-6 = .04e6 = 40e3 = 40 kHz.

#### donskiter

Joined Nov 17, 2006
29
An alternative method to calculate frequency is to measure the time between two consecutive occurrences of the event (the period) and then compute the frequency f as the reciprocal of this time:

F=1/T=1/0.000025=40000Hz

where

T is the period.