OD1402 - Lesson 1/Learning Event 1
Calculating Frequency
To determine the frequency of the waveform, we must divide the Time
Period of one cycle into 1. Use the following formula:
1
= Frequency (in Hertz)
Time Period (in seconds)
Let's determine the frequency of the waveform in figure 14.
Remember: We must change the milliseconds to seconds before we
divide:
1 1
= = 1000 Hz
1 millisecond .001 second
The frequency is 1000 Hertz.
Calculate the following frequencies:
Horizontal Deflection
TIME/DIV OR DLY TIME
(in cm per cycle)
Switch Setting
5
10 ms
4
.5 ms
5
1 ms
10
.1 sec
The correct answers are 20 Hz, 500 Hz, 200 Hz, and 1 Hz.
Let's review the first question:
First, figure the time period for one cycle:
5 cm x 10 ms = 50 ms (time period)
Then calculate the frequency:
1 1
=
= 20 Hertz
50 ms .050 sec
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