Tektronix TDS 220 - Page 5

ECE 488: RF Circuits and Systems Spring 2005
CORNELL UNIVERSITY © WES SWARTZ (03/8/2)
5
4. Push the top menu button to
select TYPE.
5. Select FREQ, PERIOD,
MEAN and PK-PK for the
four measurement types.
The values of the selected
items are then shown in the
menu and are updated
periodically. An example of a
display produced with the
above setup sequence is shown
in Figure 6.
6. Manual measurements using digital readouts
The TDS 220 can display lines (called cursors) that can be manually placed to measure
voltages and times. Suppose you want to measure the peak-to-peak voltage of a sinusoid
that has some superimposed noise spikes. You can get a measure of this by setting the
cursors (via the upper knobs in the Vertical Controls section) at positions that ignore the
noise. (The automated measurement will give the extreme value from the lowest valley
to the highest peak.) The peak-to-peak measurement would proceed as follows:
1. Push the CURSOR button to see the Cursor menu.
2. Push the top menu button to
select Voltage (toggling
through Time and Off).
3. Push the Source menu button to
select CH1.
4. Use the
CURSOR 1 knob to
place a cursor at the bottom of
the valleys as shown in Figure
7.
5. Use the
CURSOR 2 knob to
place the remaining cursor at
the top of the peaks.
Figure 6: Example of automated measurements with
digital readouts.
Figure 7: Voltage measurements using the cursors.
Horizontal
Cursors