Dda Markers; Setting Up To Use Drive Channel Analysis; Which Signals To Provide; Choosing The Waveform Section To Be Analyzed - LeCroy WaveMaster 8600A Operator's Manual

Case 4: The entire head signal is analyzed

DDA Markers

If Read Clock is acquired by the DDA, the "sample time" markers can be drawn. Because the phase
relation of RCLK to the head signal is not known, it is adjustable. It is worth noting here that the ML
markers are at positions determined by the instrument's channel emulation; the sample time
markers are at positions determined by the channel's sample clock signal with ML markers ("+"
signs) and level markers (horizontal lines).

Setting Up to Use Drive Channel Analysis

There are several basic considerations when you are preparing to use Drive Channel Analysis.
Which signals are to be provided to the DDA? What waveform section or sections will be analyzed?
What will be used as the reference waveform? What trigger and time/div settings should be used?

Which Signals to Provide

The following is an overview of the signals that can be used by the DDA.
•
Head Signal: The drive head signal is the only signal the DDA requires. The drive head
signal can either be the signal after the pre-amplifier, or the one after the drive filter if
available.
•
Read Gate: Read Gate is "optional" for all error find methods; however, it is strongly
recommended that you use Read Gate.

Choosing the Waveform Section to Be Analyzed

Before using Drive Channel Analysis, you should determine which part of the head signal will be
analyzed.
The options you have are to analyze:
•
Part of a single Read Gate cycle
•
A single Read Gate cycle
•
Multiple Read Gate cycles.
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X-Stream Operator's Manual
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