Operating Basics
TDS5000B Series Quick Start User Manual
67
Communication Measurements
Ext Ratio The ratio of eye top to base. This measurement only works for waveform database, fast
acquisition signals, or a reference waveform saved in fast acquisition mode.
Ext Ratio % The ratio of eye base to top expressed as a percentage. This measurement only works for
waveform database, fast acquisition signals, or a reference waveform saved in fast
acquisition mode.
Ext Ratio (dB) The ratio of eye top to base expressed in decibels. This measurement only works for
waveform database, fast acquisition signals, or a reference waveform saved in fast
acquisition mode.
Eye Height The measurement of the eye height in volts.
Eye Width The measurement of eye width in seconds.
Eye Top The top value used in the extinction ratio measurements.
Eye Base The base value used in the extinction ratio measurements.
Crossing % The eye crossing point expressed as a percentage of eye height.
Jitter P-P The peak-to-peak value for the edge jitter in the current horizontal units.
Jitter RMS The RMS value of the edge jitter in the current horizontal units.
Jitter 6 Sigma Six times the RMS value of the edge jitter in the current horizontal units.
Noise P-P The peak-to-peak value of the noise of the top or base of the signal as specified by you. To
ensure accurate noise values, be sure to set the signal type to Eye when measuring an Eye
signal.
Noise RMS The RMS value of the noise of the top or base of the signal as specified by you. To ensure
accurate noise values, be sure to set the signal type to Eye when measuring an Eye signal.
S/N Ratio The ratio of the signal amplitude to the noise of the top or base of the signal as specified
by you.
Cyc Distortion The peak-to-peak time variation of the first eye crossing measured at the Mid Ref as a
percent of the eye period.
Q-Factor The ratio of eye size to noise.
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