Bit Error Rate Track Profile Measurement; Hpe5022_Ber_Measuretrackprofile - Agilent Technologies E5022B Programming Manual

Bit Error Rate Track Profile Measurement

hpe5022_BER_measureTrackProfile

C Syntax ViStatus hpe5022_BER_measureTrackProfile(ViSession id, ViInt16 seqType,
ViInt16 measFunc, ViInt16 points, ViReal64 range, ViInt16 ave);
Visual Basic hpe5022_BER_measureTrackProfile(ByVal id As Long, ByVal seqType As
Syntax Integer, ByVal measFunc As Integer, ByVal points As Integer, ByVal range As
Double, ByVal ave As Integer) As Long
Description This function measures the track profile of the bit error rate according to the
specified sequence type. There are three sequence types: 1) erase, write data, then
measure 2) no erase, write data, then measure 3) measure only. The detailed
sequence is as follows:
1. Create the offset array data, offset[i] according to parameters 'points' and
'range'. The offset data is from -range to +range by a step of
(2
2. Move the head to the write offset position as specified by the
"hpe5022_writeTrackOffset" function.
3. If seqType is set to "hpe5022_SEQ_ER_WR_M", three track erase is
performed (i.e, the track and gaps between tracks are erased).
4. Write the background adjacent track as specified by
"hpe5022_BER_adjacentTrackPattern" function.
5. Write the test track as specified by "hpe5022_BER_write" function.
6. Write the foreground adjacent track as specified by
"hpe5022_BER_adjacentTrackPattern" function.
7. Move the head to the read offset position as specified by the
"hpe5022_readTrackOffset" function.
8. Perform read operation to adjust AGC and adaptive FIR.
9. Iterate to measure error rate while moving the read track offset according to the
offset array (i.e, step 8 is repeated to build the bathtub curve). The offset
direction is from track center to the -range. (See Figure 3-8 ).
10. Iterate step 2 to step 9, to get the number of average results.
Chapter 3
´ range/(points-1)).
Function Reference
Bit Error Rate Track Profile Measurement
171