Technical data

Oscilloscope Familiarization Labs 2

3000 X-Series Oscilloscopes Advanced Training Guide 17

25 Press the Settings softkey; then press the Thresholds softkey.

26 Press the Lower softkey; then turn the Entry knob until it reads 20%.

27 Press the Upper softkey; then turn the Entry knob until it reads 80%.

28 To return to the previous menu, press the (Back) front panel key

(just above the power switch).

29 Press the (Back) key again because we descended two levels into

this menu.

30 Press the Type softkey; then turn the Entry knob until the arrow points

to Rise Time.

31 Now either press the Add Measurement softkey, or push the Entry knob

to add this measurement.

Using these user-defined measurement threshold levels (20% and 80%), our

rise time measurement should be faster because we are now measuring

across a shorter segment of the waveform as shown in Figure 6. The

measurement should now read approximately 30 ns. When we used the

scope’s default 10%/90% threshold levels, the measurement should have

read approximately 40 ns.

Let’s now make one more measurement before completing this lab. But

this time let’s perform a more comprehensive set of measurements on this

waveform.

32 Set the scope’s timebase to 500.0 ns/div.

Figure 6 Performing a rise time measurement relative to 20% and 80% threshold levels.

Back