Table of Contents
Advertisement
Glossary
A
Absolute Polarity The absolute
polarity test is used to detect the pinned
layer reversal of the GMR head.
B
Bath Tub Test A type of BER test that
is used to determine the number of
tracks per inch.
Bit Error Test A type of measurement
that is used to determine what fraction
of the total bits are in error.
D
Drive Configuration A configuration
that determines the head position and
skew angle. Since the spinstand adopts
an x-y stage method, a simulating real
drive head movement is required. This
configuration is used to achieve the
calculation of the simulation.
M
Measurement Mode A mode that sets
an input range and a PW reference.
"Input Range Control & Auto
Configuration" on page -308.
Measurement Type A sequence type
of measurement. There are three
sequence types: 1) a sequence to erase
the track(s), write the specified data
and execute measurement. 2) a
sequence to write the data and make a
measurement. 3) a sequence to
measure only.
P
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Popcorn Noise Popcorn Noise are
random noise spikes that occur when
the head changes its operation from
write to read.
PW reference A rough PW value to
make measurements on a parametric
module. See "TAA Measurement" on
page -240.
R
Resolution This is an old test method
that is used to measure the effect on
how close transitions occur.
S
Sense Current Current that is supplied
to the head to read the data is called
"sense current". When a magnetic
inductive head is used as a device
under test, it is called read bias current.
Typical GMR sense current value
would be 5 [mA].
Sweep Measurement A sweep
measurement allows you to observe a
characteristic of a measured parameter
while changing a parameter. For
example, the channel bit rate sweep
measurement observes the
characteristics of either TAA or PW
while changing the channel bit rate.
T
T A unit used to express the
fundamental period of the channel bit
period.
Thermal Asperity
When the sense
current flows through the MR element of
the read head it undergoes joule heating. In
general, the MR sensor operates
447
Advertisement
Table of Contents
