Keysight 4000 X-Series, Руководство по продвинутой подготовке

Страница: 15 / 170

Oscilloscope Familiarization Labs
2
4000 X-Series Oscilloscopes Advanced Training Guide 15
At this point, you should see a repetitive digital pulse with overshoot and ringing
similar to what is shown in Figure 1 . Note that all front panel knobs are pushable. If
you push the V/div knob or time/div knob, you can toggle between course
adjustment and fine adjustment (vernier control). When other knobs are pushed,
the scope will pre-set conditions associated with that particular knob. For
instance, if you push one of the vertical position/offset knobs, offset will be set to
0.0 V for that input channel. If you push the horizontal position/delay knob, delay
relative to trigger will be set to 0.0 seconds. If you push the trigger level knob, the
scope will automatically set the trigger level to approximately 50%.
Let’s now use the scope’s “cursors” function to measure the positive pulse width
and peak-to-peak voltage of this waveform. First, visually locate the “Cursors”
button in the Measure section of the front panel as shown in Figure 2 .
9
Push the Cursors button; then select "X1" on the right side of the display. A pop
up appears where you can increment its value (arrows) or explicitly assign its
value (press the value to make the keyboard appear). You may also choose to
drag the orange X1 flag on the bottom edge of the screen to move the cursor to
your desired position. The cursors knob can also be used for fine tuning and
adjustments.
10
Move the X1 cursor (#1 timing marker) so it intersects with a rising edge of the
pulse.
11
Select X2 on the right of the display (#2 timing marker) and position it on the
falling edge of the same pulse.
12
Select Y1 on the right of the display (#1 voltage marker) and move it vertically
such that it intersects with the negative peak of the pulse.
13
Select Y2 on the right of the display (#2 voltage marker) and move it vertically
such that it intersects with the positive peak of the pulse.
Figure 2 Measurement Cursors knob.