Hpe5022_Ber_Measure747 - Agilent Technologies E5022B Programming Manual

Function Reference
747 Measurement Function

hpe5022_BER_measure747

C Syntax ViStatus hpe5022_BER_measure747(ViSession id, ViInt32 points, const ViReal64
offset[]);
Visual Basic hpe5022_BER_measure747(ByVal id As Long, ByVal points As Long, ByRef
Syntax offset As Double) As Long
Description This function performs the 747 test. The 747 measures the OTC (off-track
capability) versus the track offset when BER is measured. The sequence is written
below.
1. Set i to zero (i = 0)
2. Perform three track erase. (i.e, Gaps between track are also erased.)
3. Move the head to the position specified by the parameter '+oldPos' of the
4. Write the data pattern specified by the parameter 'old_pat' of the
5. Move the head to the position specified by the parameter 'oldPos'.
6. Write the data pattern specified by the parameter '-old_pat'.
7. Move the head to the position specified by the "hpe5022_writeTrackOffset"
8. Write the data pattern on the test track selected by the
9. Move the head to the position specified by the parameter 'offset[i]'.
10. Write the data pattern specified by the parameter 'adj_pat' of the
11. Move the head to the position specified by the parameter '-offset[i]'.
12. Write the data pattern specified by the parameter 'adj_pat'.
13. Measure the track profile of the test track according to 'trk_prof_size' and
14. Calculate OTC. The threshold level to calculate OTC is specified by the
15. Increment i by 1. (i = i+1).
16. If i is not equal to 'points', go to the step 9.
Parameters • id
202
"hpe5022_BER_747Config" function.
"hpe5022_BER_747Config" function.
function.
"hpe5022_BER_selectPattern" function.
"hpe5022_BER_747Config" function.
'trk_prof_range' of the "hpe5022_BER_747Config" function. The track profile
measurement sequence is the same as the
"hpe5022_BER_measureTrackProfile" function.
"hpe5022_BER_otcThreshold" function.
Description Specifies the system identifier. This is given by the
"hpe5022_init" function.
Chapter 3