TDS5000B Online Programmer Guide
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H QFACtor
This measures the quality factor. The Q factor is a figure of merit for
an eye diagram, which indicates the vertical eye opening relative to
the noise at the low and high logic levels. It is the ratio of the eye size
to noise.
H RISe
This timing measurement finds the rise time of the waveform. The
rise time is the time it takes for the leading edge of the first pulse en-
countered to rise from a low reference value (default is 10%) to a high
reference value (default is 90%).
H RMS
This amplitude measurement finds the true Root Mean Square voltage
in the entire waveform or gated region.
H RMSJitter
This measures the variance in the time locations of the cross point.
The RMS jitter is defined as one standard deviation at the cross point.
H RMSNoise
This measures the Root Mean Square noise amplitude on a waveform
at the mid reference level.
H SIGMA1
This (histogram measurement) measures the percentage of points in
the histogram that are within one standard deviation of the histogram
mean.
H SIGMA2
This (histogram measurement) measures the percentage of points in
the histogram that are within two standard deviations of the histogram
mean.
H SIGMA3
This (histogram measurement) measures the percentage of points in
the histogram that are within three standard deviations of the histo-
gram mean.
H SIXSigmajit
This (histogram measurement) is six * RMSJitter.
H SNRatio
This measures the signal--to--noise ratio. The signal --to --noise ratio is
the amplitude of a noise rejection band centered on the mid level.
H STDdev
This measures the standard deviation (Root Mean Square (RMS)
deviation) of all acquired points within or on the histogram box.
H UNDEFINED
This is the default measurement type, which indicates that no mea-
surement type is specified. Once a measurement type is chosen, it can
be cleared using this argument.
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