• Quantified, Repeatable Jitter
Measurements
• Increased Accuracy and Throughput
• Objective Readings Free of Interpretation Errors
• Jitter and EFM RF Levels Simultaneously
• Level Meter Shows 3T and 11T Bits and Ratios
• Peak and Sigma-Weighted Jitter Readings
• Polarity Selector for Jitter Referenced to Rising or Falling Transitions
to Show Asymmetry
• GO/NO GO judgement with Adjustable Thresholds
• Switchable Speeds. Xl, X8, XI0, X12
• Processing to Correct 3T Asymnmetry Prior to Jitter Measurement
Representing the 3rd generation of CD jitter meters, the LE 1854
extend the range of this powerful performance gauge to meet the needs
of rapidly expanding CD applications. Designed for disc mastering,
disc production, player production and quality control, the instrument
assists in production tuning, optimization and documentation.
RF levels and jitter readings are shown simultaneously with selectors
to read 3T and 11T levels of the EFM (eight to fourteen modulation)
signal. The sigma s measuring mode displays the amount of jitter
error within ? standard deviation of the mean. This produces a
near steady state meter reading to facilitate accurate measurements
and adjustments. Displayed values are objective and not subject
to the kind of interpretation errors experienced when viewing EFM
signals on an oscilloscope. The LE 1854 reads jitter in Sigma values
only. A polarity selector for jitter references the readings to
either the rising (pit-to-land) or the falling (land-to-pit) transitions
to show asymmetric differences. Signal processing partially corrects
3T asymmetry to minimize the effect on the jitter reading at higher
speeds. In addition to 3T and 11T level readings, a buffered output
allows oscilloscope observation of ratio and symmetry.
Of particular value in production and QC operations, the GO/NO
GO judgement section provides adjustable thresholds for 3T and
11T peak levels as well as jitter limits. Front panel GO/NO GO
indicators are augmented by rear panel outputs for remote indicators
or alarms. DC meter analogs are also provided on the rear panel
for remote level and jitter indicators.
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