HP 1660CS-Series User Manual page 219

The Scope Auto Measure Menu
Automatic measurement algorithms
Measurement algorithms
Frequency (Freq) The frequency of the first complete cycle displayed
is measured using the 50% levels.
If the first edge on the display is rising, then
Freq =
t
rising edge 2
If the first edge on the display is falling, then
1
Freq =
− t
t
falling edge 2
Period The period is measured at the 50% voltage level of the waveform.
If the first edge on the display is rising, then
Period = t
rising edge 2
If the first edge on the display is falling, then
Period = t
falling edge 2
Peak-to-Peak Voltage (Vp_p) The maximum and minimum voltages
for the selected source are measured:
− V
Vp_p = V
maximum
where V and V
maximum minimum
present on the selected source.
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
If the first edge on the display is falling, then
+Width = t
falling edge 2
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
If the first edge on the display is falling, then
−Width = t
rising edge 1
7-100
1
− t
rising edge 1
falling edge 1
− t
rising edge 1
− t
falling edge 1
,
minimum
are the maximum and minimum voltages
− t
edg e 1
rising
− t
edg e 1
rising
− t
edg e 1
falling
− t
falling edg e 1