HP 1660CS, User Manual

Page: 219 / 347

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 =
1
t
rising edge 2
−
t
rising edge 1
If the first edge on the display is falling, then
Freq =
1
t
falling edge 2
−
t
falling edge 1
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
−
t
rising edge 1
If the first edge on the display is falling, then
Period = t
falling edge 2
−
t
falling edge 1
Peak-to-Peak Voltage (Vp_p) The maximum and minimum voltages
for the selected source are measured:
Vp_p = V
maximum
−
V
minimum
,
where V
maximum
and V
minimum
are the maximum and minimum voltages
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
−
t
rising edg e 1
If the first edge on the display is falling, then
+Width = t
falling edge 2
−
t
rising
edg e 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 edg e
1
If the first edge on the display is falling, then
−
Width = t
rising edge
1
−
t
falling
edg e 1
The Scope Auto Measure Menu
Automatic measurement algorithms
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