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 1
^ " T " 16.6 X 10'"^s "
Rise Time
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 CH1 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
2205 Operator's