Agilent Technologies 1670E Series, Руководство пользователя

Страница: 149 / 650

149
Using the Oscilloscope
The Scope Auto Measure Menu
Positive Pulse Width (+Width). Pulse width is measured at the 50%
voltage level.
If the first edge on the display is rising, then
+Width = t falling edge 1 - t rising edge 1
If the first edge on the display is falling, then
+Width = t falling edge 2 - t rising edge 1
Negative Pulse Width (-Width). Negative pulse width is the width
of the first negative pulse on screen using the 50% levels.
If the first edge on the display is rising, then
-Width = t rising edge 2 - t falling edge 1
If the first edge on the display is falling, then
-Width = t rising edge 1 - t falling edge 1
Rise time. The rise time of the first displayed rising edge is measured.
To obtain the best possible measurement accuracy, set the sweep
speed as fast as possible while leaving the full leading edge of the
waveform on the display. The rise time is determined by measuring
time at the 10% and 90% voltage points on the rising edge:
Rise time = t
90%
- t
10%
Fall time. Fall time is measured between the 10% and 90% points of
the falling edge. To obtain the best possible measurement accuracy, set
the sweep speed as fast as possible while leaving the falling edge of the
waveform on the display:
Fall time = t
10%
- t
90%