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QA-201

The QA201-D Jitter Analyzer System

JITTER / TBE ANALYZER The QA201-D Jitter Analyzer is an easy to use PC-based time interval measurement system that makes Jitter and Effect Length measurements according to Philips Orange, Yellow, and Red book standards. It measures both jitter and length deviation for all sizes of pits and lands (3T - 11T). It also measures error rates and provides a means to make pit geometry measurements. The QA201-D Jitter Analyzer uses a Philips CDM12 three-beam pickup, which is used by Philips for jitter measurements. This system is the only jitter measurement system on the market that conforms to Orange Book jitter measurement specifications.

FEATURES

Why Measure Jitter?

Jitter is a measure of the random variation in pit and land lengths. Jitter is important because the CD information is carried in the edges of the pits. A transition between pit and land (either pit to land or land to pit) is a one, and everything else is a zero. Since the data is self-clocked at a constant rate, if the edges of the pits are not in the correct places, errors will be generated. If a transition between pit and land comes as little as 115 ns early or late, an error will result. A standard deviation of less than 35 ns will result in only about 1% probability of the effect lengths varying by more than 115 ns.

In addition, many types of disc defects will affect the jitter, making this a sensitive test of disc quality. Pit distortion, crosstalk from adjacent tracks, intersymbol interference, pit wall steepness, low signal-to-noise ratio, and LBR (or CD-R writer) instability can all cause jitter on the disc. Displays

Histograms of 3T - 11T pit and land lengths give a graphical representation of the lengths of all pits and lands. You can get a good idea of the disc quality from this graph by observing the widths of the lobes. Obviously, when lobes overlap, errors will be generated.

Error Graph

All error flags can be graphed. A summary of error results (peak & average values over the disc) is displayed and printed. The length deviation graph shows the deviation of the pit and land lengths from their ideal values.

System Requirements:· IBM PC compatible (486 or Pentium) · VGA graphics, 256 colors·One available 8-bit ISA slot· One available serial port·Windows 98 / 95 / 3.1
SPECIFICATIONS

* Power consumption: 33 watts (110/220 VAC 50/60 Hz)
* Dimensions: 17" x 12" x 3.5"
* Weight: 16 lbs.
* Outputs: AES / EBU Audio, RCA Analog Audio, BNC HF, BNC TRK, RS-485 (DB-15), Printer (DB-25).

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Eyecote International Limited
European Corporate Office
Singleton Court, Monmouth,
NP25 5JA. United Kingdom.
Tel: +44 1600 772433 Fax: +44 1600 715749
E-mail:- cd-qc@eyecote.com