Period And Frequency; Rise Time - Tektronix 2205 Operator's Manual

Applications
Substituting the given values:
Time Duration = 8.3 div x 2 ms/div = 16.6 ms

Period and Frequency

In the preceding example, you measured the time duration of
one complete waveform cycle. This particular measurement is
called the waveform period (T ). The frequency (f) of a recur­
rent signal can be determined from its period as follows:
1. Measure the time duration of one waveform cycle (period)
using the preceding time-duration measurement procedure.
2. Calculate the reciprocal of the period to determine the
waveform frequency.
EXAMPLE. The signal in Figure 3 -5 has a period (T) of 16.6 ms.
Calculating frequency (f):
1
f = T "
Rise Tim e
Rise time measurements use the same methods as time dura­
tion, except that the measurements are made between the 10%
and 90% points on the low-to-high transition of the selected
waveform. Fall time is measured between the 90% and 10%
points of the high-to-low transition of the waveform.
1. Apply a signal to either the CHI or the CH2 input connector
and set the VERTICAL MODE selector to display the channel
used.
2. Set the appropriate VOLTS/DIV and VOLTS/DIV Variable
(CAL) control for an exact 5-division display.
3. Vertically position the traces so that the zero reference of
the waveform touches the 0% graticule line and the top of
the waveform touches the 100% graticule line.
4. Horizontally position the display so the 10% point on the
waveform intersects the second vertical graticule line (Fig­
ure 3 -6 , Point A).
3-10
1
16.6 x 10'3s = 60 Hz
2205 Operator's