Tektronix TDSDDM1, User Manual

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TDSDDM1 Disk Drive Measurement Application User Manual
A–1
Appendix A: Specifications
Table A–1 lists the measurements provided by the TDSDDM1 Disk Drive
Measurement Application.
Table A–1: TDSDDM1 Disk Drive Measurement Application measurements
Measurement name
Abbrevi-
ation
Description
Track Average Amplitude TAA Measures the average peak-to-peak value of the
data on the Read signal.
Track Average Amplitude
Plus TAA+ Measures the average positive peak value of
the data on the Read signal.
Track Average Amplitude
Minus TAA– Measures the average negative peak (trough)
value of the data on the Read signal.
Pulse Width at 50% PW50 Measures the average pulse width of the Read
signal.
Pulse Width at 50% Plus PW50+ Measures the average positive pulse width of
the Read signal.
Pulse Width at 50% Minus PW50– Measures the average negative pulse width of
the Read signal.
Nonlinear Transition Shift
Initial Magnetization NLTS Initial
Mag Measures non-linear transition shift due to initial
DC erasure.
Nonlinear Transition Shift 1st
Adjacent NLTS 1st Ad-
jacent Measures non-linear transition shift due to
adjacent transitions spaced 1 bit apart.
Nonlinear Transition Shift
2nd Adjacent NLTS 2nd
Adjacent Measures non-linear transition shift due to
adjacent transitions spaced 2 bits apart.
Signal-to-Noise Ratio SNR Measures the signal-to-noise ratio of the
readback signal to readback noise.
Overwrite Measures the amount of residual signal
remaining from a previous write operation after
new data is written to the same location.
Resolution Measures the ratio of two TAA measurements,
performed at two different write frequencies.
Asperity Locates thermal asperities on the media
surface.