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