Canon WITE32 Especificações descarregar pdf (Página 47)

WITE32 Release Notes Version 3.20

4.2.1 Head Bandwidth Selection for RWA Models With Servo-3

In order to support Servo-3 for low frequency heads the head bandwidth selection feature is introduced. To

specify the head bandwidth the Head Bandwidth frame is added to the Servo Control dialog box (Control |

Servo). This frame has the following three options:

• 110 MFlux/s and Above

• 54-110 MFlux/s

• Below 54 MFlux/s

Figure 21: Head Bandwidth Selection

You select the appropriate head bandwidth range depending on the maximum frequency of the non-degraded

signal, which the head under test can deliver. For example, if the head under test can reliably write and read

signals only up to 100 MFlux/s frequency, then you select the 54-110 MFlux/s head bandwidth option.

If the servo calibration procedure detects that the optimal servo frequency is lower than the selected head

bandwidth range, it terminates with the following error message: “The measured optimal servo frequency

<value1> is lower then minimal frequency <value2>. Please, check the “Head Bandwidth” setting in the

“Servo Control” dialog box”.

If the optimal servo frequency is higher than the selected head bandwidth range, the servo calibration procedure

finishes, but displays the following warning message in the status bar of the Servo Calibration dialog box: “The

head has higher bandwidth than selected in Servo Control dialog box” (see Figure 22).

Note: Lower head bandwidth selection increases the size of the servo area (the portion of the track occupied by the servo

data).

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