4. DVD-RAM Jitter Measurement
The LE 1875 (S1 version) can measure jitter in a very narrow, specific portion on the disc by using a digital processing methods.
The signal level changes caused by a difference of reflectivity since the user data block (A) and the header block (B) are alternately arranged on the DVD-RAM as shown in the figure below. Therefore, it is necessary to measure the block respectively.
Example: DVD-RAM jitter measurement
* CAPA (Acronym for Complementary Allocated Pit Address):Address signal
Measuring jitter of the user data block
Measuring jitter of the header block (CAPA block)
Measuring jitter of the header block (CAPA block)
Jitter of the user data block and the header block can be respectively measured since the LE 1875 (S1 version) provides the inhibit function to set the inhibit block for measuring jitter and the arming function to set the block to be measured.
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