PCC D3400 - 6.9.9 Overshoot and Settling Response Procedure; Repetitive Track Seek Settings for Overshoot and Settling Response Tests

6.9.9 OVERSHOOT AND SETTLING RESPONSE PROCEDURE
The following steps are used to measure the overshoot and settling response of the
positioner.
6.9.9.1 Test Configuration
(1) Prepare the positioner as described in Paragraph 6.9.1.
(2) Set the oscilloscope as follows.
• Set
Channel 1 sensitivity to 0.2v per division.
• Connect Channel 1 X10 test probe to TP20.
• Set Channel 2 sensitivity to 0.2v per division.
• Connect Channel 2 X10 test probe to TP12 on the Logic PCBA (Busy Signal
NLBSXG).
• Set
sweep. rate; refer to Table 6-4, Step 1 (Step 7 for 200 tpi).
• Set channel select switch to Chopped mode.
• Set internal sync to Channel 2.
(3) Set disk exerciser as follows.
• Set exerciser to perform repetitive track seek; refer to Table 6-4, Step 1 (Step 7
for
200 tpi).
• Set Data mode switch to R/W.
• Set exerciser to Auto.
Table 6-4
Repetitive Track
Seek Settings for Overshoot and
Settling Response Tests
Disk Drive
Exerciser
Oscilloscope
Seek-Time
Step
Track-Seek
Time
Type
Range
l3ase
Limits
1
100 tpi
000 - 001
5 msec/div <9 msec
2
100tpi
100 -101 5 msec/div
<9 msec
3
100 tpi 201 - 202
5 msec/div <9msec
4
100 tpi 000 -067
5 msec/div <35 msec
5
100 tpi
000 - 202
5 msec/div
<60 msec
6
100 tpi
Increment 2 msec/div <9 msec
7
200 tpi
000 - 001
5 msec/div <10 msec
8
200 tpi 200 - 201
5 msec/div <10 msec
9
200 tpi 404 - 405
5 msec/div <10 msec
10 200 tpi
000 -134 5 msec/div <40 msec
11 200 tpi 000 - 405
10 msec/div <65 msec
12
200 tpi Increment 2 msec/div
<10 msec
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630D