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Offset Step
Average
Old Pattern #
Old Pattern Position
Adjacent Trk. Pat. #
4. Return to the 747 measurement menu after setting the parameters.
5. The [More Config.], [Pattern Config], [Register Config.] and [BER Config.] buttons
are added for additional configurations. Click on any of these buttons to set a new
parameter value as required by measurement applications.
6. Click on [Measure] to start measurement.
Measurement
The graph shows the resulting OTC vs. Offset characteristic curve of the 747
Display
measurement. In order to get good results, three data patterns should be set properly in
the [747 Setup] menu, namely; [BER Pattern #], [Old Pattern #] and [Adjacent Track
Pat. #]. The menu shows how much off-track can be afforded between the data track
and the read head for a fixed error rate level at a specified distance from an adjacent
track. The analysis of the 747 test measurement is explained in the 'Measurement
Definition' of the Operation Manual.
7. Click on the [Return] button to return to BER Main menu.
Chapter 3
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VEE Measurement Program Operation
range. The NOP range should be from 1 min.
to 201 max. Refer to the "hpe5022_BER_747
Config" function of the programming manual
for details.
Specifies the step by which the head is moved
to measure track profile. This parameter is
computed and updated automatically when
[Range] and [NOP] parameters are specified.
Specifies the number of track profile
measurements to be averaged.
Specifies the old data pattern to be written at
the old pattern position. The selected pattern
number must be specified in the [Pattern
Config.] menu in advance.
Specifies the position of the old data pattern
written on the track. This pattern is
overwritten by the [BER Pattern #] specified
in the 747 test menu. The position range can
be set from -6[µm] min. to 6[µm] max.
Specifies the pattern number to be used to
write the data pattern of the adjacent track.
The selected pattern number must be specified
in the [Pattern Config.] menu in advance.
Measurement
189
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