HDO9000 High Definition Oscilloscopes Operator's Manual
List of Standard Measurements
The measurements included standard with your instrument are listed below alphabetically.
Note:
Additional measurements may be available depending on the software options installed.
Measurement
Description
Amplitude
(ampl)
Measures the difference between upper and lower levels in two-level signals. Differs from pkpk
in that noise, overshoot, undershoot, and ringing do not affect the measurement. Amplitude is
calculated by using the formula Top – Base. On signals not having two major levels (such as tri-
angle or saw-tooth waves), the amplitude parameter returns the same value as peak-to-peak.
Area
Integral of data. Computes area of the waveform relative to zero level. Values > zero contribute
positively to the area; values < zero, negatively.
Base
Lower of two most probable states (higher is top). Measures lower level in two-level signals. Dif-
fers from min in that noise, overshoot, undershoot, and ringing do not affect measurement. On
signals not having two major levels (such as triangle or saw-tooth waves), the amplitude para-
meter returns the same value as minimum.
Bit Rate
Bit rate of serial data stream.
Cycles
(cycles)
Determines number of cycles of a periodic waveform lying between cursors. First cycle begins
at first transition after the left cursor. Transition may be positive- or negative-going.
Delay
Time from trigger to transition: Measures time between trigger and first 50% crossing of spe-
cifies signal. Delay can be used to measure the propagation delay between two signals by trig-
gering on one and determining delay of other.
Delta Delay
(ddelay)
Computes time between 50% level of two sources.
Dperiod@level
(dper@lv)
Adjacent cycle deviation (cycle-to-cycle jitter) of the period measurement for each cycle in a
waveform. The reference level for this measurement can be specified.
Dtime@level
(dt@lv)
Computes the time between transitions of the selected sources at the specified levels. Only pos-
itive going transitions are counted.
Dtrig Time
(dtrig)
Time from last trigger to this trigger
Duration
(dur)
For single sweep waveforms, dur is 0; for sequence waveforms: time from first to last segment's
trigger; for single segments of sequence waveforms: time from previous segment's to current
segment's trigger; for waveforms produced by a history function: time from first to last accu-
mulated waveform's trigger.
Duty Cycle
Percent of period for which data are above or below the 50% level of the signal.
Duty@level
(duty@lv)
Percent of period for which data are above or below a specified level.
Dwidth@level
Difference (delta) between adjacent widths above or below a specified level.
Edge@level
(edge@lv)
Number of positive edges in waveform that cross the specified threshold level.
Edge to Edge
Delta time between some edge on the first source to some (other) edge on a second source.
Fall 80-20%
(fall8020)
Duration of pulse waveform's falling transition from 80% to 20% of the amplitude averaged for
all falling transitions between the measurement gates. On signals not having two major levels
(triangle or saw-tooth waves, for example), top and base can default to maximum and minimum,
giving less predictable results.
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