MJM-6350 CD JITTER METER

< DESCRIPTION >

The MJM-6350 is the CD Jitter Meter designed for measuring the time jitter in the EFM modulated signal and signal level of CD players, CD-ROM drivers and other devices at Standard/Dual/Quadruple speed.
For jitter measurement, it extracts the 3T component of the EFM signal to measure the jitter in real time and display on the meter. For level measurement, it selects the bits of 3T or 11T to measure the signal level and display on the meter. It also indicates GO or NO-GO for jitter and level measurement with lamps according to preset GO/NO-GO threshold values and displays the results on the meter. In addition, this instrument is installed in an automatic measuring system and controlled with a GP-IB interface.

< FEATURES >

1. Standard, Dual and Quadruple speed measurements are selectable for jitter and level.

2. The 3T jitter of the EFM signal of disk drivers can be read directly from the meter.

3. The jitter value is indicated in standard deviation (SIGMA mode).

4. Changes in the jitter can be read continuously, due to the T/V conversion method of measurement.

5. The polarity of the 3T measurement can be selected (positive-going or negative-going)

6. Improvements in the compensation circuit for the period have resulted in highly stable operation when the signal

    is in the asymmetrical condition.

7. For level measurement, it selects bits of 3T or 11T of EFM signal.

8. The level value is indicated in Peak-to-Peak form.

9. A GO/NO-GO result is indicated in relation to a preset threshold value for jitter and level measurement.

10. The GP-IB (option) is built-in for automatic control.

SPECIFICATIONS

Input Characteristics

Input Signal EFM signal (eye-pattern)

Clock frequency ×1: 4.3218MHz  ×2 : 8.6436MHz  ×4 : 17.2872MHz

Level Range  0.2Vp-p~ 5Vp-p (max. 10Vp-p)

Input Impedance  1M Ohm

Jitter Measurements

Measurement Range  ×1 : 2.5T ( 578nsec )~ 3.4T ( 787nsec ) ×2 : 2.5T ( 289nsec )~ 3.4T ( 393nsec )  ×4 : 2.5T ( 145nsec )~ 3.4T ( 197nsec )

Pulse Compensating Range  ×1 : 694nsec ±100nsec or over

(Asymmetric variable range)  ×2 : 347nsec ±50nsec or over  ×4 : 174nsec ±25nsec or over

Meter Indication Mode

SIGMA (Standard deviation) mode

Meter Range  ×1 : 30nsec and 60nsec full scale  ×2 : 15nsec and 30nsec full scale ×4 : 7.5nsec and 15nsec full scale

Meter Readout Accuracy  ±5% of full scale

Polarity of Input Signal

Positive or Negative, selectable

Residual Jitter  Less than ±5% of full scale

Judgment Function Possible to preset the GO/NO-GO threshold value

Level Characteristics

Measuring Signal  11T ( 2545nsec ±100nsec) ×1 : 3T ( 694nsec ±100nsec) 11T ( 1273nsec ± 50nsec) ×2 : 3T ( 347nsec ± 50nsec)  11T ( 636nsec ± 25neec) ×4 : 3T ( 174nsec ± 25nsec)

Measuring Range  0.025Vp-p ~3Vp-p

Meter Readout  Accuracy ±5% at full scale

Judgment Function  Possible to preset the GO/NO-GO threshold value

Output Characteristics

MONITOR  4Vp-p±5% of Input signal at open circuit

Output Impedance  75 Ohm ±10%  JITTER 1Vp-p ±10% of full scale at open circuit

Output Impedance  600 Ohm ±10%

RECORDER

JITTER& LEVEL 1V DC ±5% of full scale at open circuit

Output Impedance  600 Ohm ±10%  1V DC ±5% at full scale at open circuit

Output Impedance  600 Ohm ±10%

JUDGE

JITTER& LEVEL Output of TTL level

Remote Control Function A remote control operation is available

General Data

Operating Temperature  0ºC to 40ºC

Power Requirement  100, 115, 215, 230V AC ±10%, 50/60Hz

Dimensions& Weight  Approx. 150(W)×220(H)×325(D)mm,4.2kg

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