Teledyne HDO9000, Руководство оператора

Страница: 112 / 188

HDO9000 High Definition Oscilloscopes Operator's Manual
Measurement Description
Level@X
(lvl@x)
Gives the vertical value at the specified
x
position. If the
x
position is between two points, it
gives the interpolated value. When the Nearest point checkbox is selected, it gives the vertical
value of the nearest data point.
MATLAB param
Custom MATLAB function that produces a measurement. Requires XDEV option to edit func-
tions through the oscilloscope GUI using MATLAB Script.
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.
Median
The average of base and top values.
Minimum
(min)
Measures the lowest point in a waveform. Unlike base, does not assume waveform has two
levels.
N-cycle Jitter
Peak-to-peak jitter between edges spaced
n
UI apart.
NBPhase
Provides measurement of the narrow band phase at a specific frequency of the waveform.
NBPower
Provides measurement of the narrow band power at a specific frequency of the waveform.
None
Disables parameter calculation
Num Points
(npoints)
Number of points in the waveform between the measurement gates.
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.
Ov
Amount of overshoot following a rising edge specified This is represented as a percentage of
amplitude. Ov 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.
Peak to Peak
(pkpk)
Difference between highest and lowest points in waveform. Unlike ampl, does not assume the
waveform has two levels. Peak to peak is calculated using the formula
maximum – minimum
.
Peaks
Number of peaks in a histogram.
Percentile
(pctl)
Horizontal data value that divides a histogram so the population to the left is xx% of the total.
Period
The time between every other pair of 50% crossings. Starting with first transition after left meas-
urement gate, period is measured for each transition pair, with values averaged to give final res-
ult.
Period@level
(per@lv)
The time between every other pair of at the level specified. Starting with first transition after left
measurement gate, period is measured for each transition pair, with values averaged to give
final result.
Phase
Phase difference between signal analyzed and signal used as reference. Both signals are
measured from the 50% point of their rising edges.
Rise 20-80%
(rise2080)
Duration of pulse waveform's rising transition from 20% to 80% of the amplitude averaged for
all rising 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.
Rise Time
Duration of pulse waveform's rising transition from 10% to 90% of the amplitude averaged for
all rising 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.
102