Chapter 3
161
VEE Measurement Program Operation
Measurement
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Write Time
Specifies the time to write the data. This
parameter is expressed in terms of [
µ
sec].
Delay
Specifies the distance in time between write
and read operations. This parameter represents
the delay time when to read the data after
write. This parameter is expressed in terms of
[
µ
sec].
Read Time
Specifies the amount of time to read the data.
This parameter is expressed in [
µ
sec].
Write Mode
Specifies the write data polarity when writing
the data. When ‘Fixed’ is selected the write
current direction of each write operation is the
always the same. When ‘Continuous’ is
selected the write current direction at the
beginning of write operation is the same as the
last current direction of the previous write.
Refer to the programming manual.
Figure 3-104
Write Mode
When [Write Mode] is set to “fixed”, the write current direction at the beginning of
each write operation is always the same. On the other hand, when [Write Mode] is set
to “continuous” the write current direction is the same as the last current direction of
the previous write operation. Each time it alternates it allows you to check the polarity
of the output pulse at the end of the previous write. You must set the repetitive period of
the data pattern T to 1T, 2T, 4T and 8T due to the system’s internal constraints. If you
use other repetitive periods of the data pattern, E5022/E5023 system can not guarantee
the change of write current polarity. This function makes it possible for popcorn noise
measurement (i.e. failcount) to achieve an acceptable level of TAA under similar usage
of the drive. Before this function was introduced, the write current direction always
starts at a constant direction, thus you can only observe one side of the output.
NOTE
If the attached head amplifier does not support “continuous” write current function, a
system error “hpe5022_ERROR_NSUP_CONF” will be displayed, when you set the
[Write Mode] to “Continuous”.
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