User manual

WaveSurfer 3000/3000z Oscilloscopes Operator's Manual
List of Standard Measurements
Measurements included standard with the oscilloscope are listed below alphabetically.
Note: There may be additional parameters available depending on the software options installed
on the oscilloscope.
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 greater than zero
contribute positively to the area; values less than 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.
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.
Duty Cycle
Percent of period for which data are above or below the 50% level of the signal.
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.
Fall time
(fall)
Duration of pulse waveform's falling transition from 90% to 10% 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.
Frequency
(freq)
Period of cyclic signal measured as time between every other pair of 50% crossings. Starting
with first transition after left measurement gate. The period is measured for each transition pair.
The reciprocal of each period measurement is calculated as the frequency.
Maximum
(max)
Measures highest point in waveform. Unlike top, does not assume waveform has two levels.
Mean
Average of data for time domain waveform. Computed as centroid of distribution for a histogram
of the data values.
Minimum
(min)
Measures the lowest point in a waveform. Unlike base, does not assume waveform has two
levels.
None
Disables parameter calculation.
Overshoot-
Amount of overshoot following a falling edge. This is represented as percentage of amplitude.
Overshoot- is calculated using the formula (base - min.)/ampl x 100. On signals not having two
major levels (triangle or saw-tooth waves, for example), may not give predictable results.
Overshoot+
Amount of overshoot following a rising edge specified This is represented as a percentage of
amplitude. Overshoot+ is calculated using the formula (max. - top)/ampl x 100. On signals not
having two major levels (triangle or saw-tooth waves, for example), may not give predictable
results.
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