MJM-6350 CD Jitter Meter

* End of production



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

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

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

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

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

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

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Improvements in the compensation circuit for the period have resulted in highly stable operation when the signal is in the asymmetrical condition.

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

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

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

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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

0.02Vp-p to 5Vp-p (max. 10Vp-p)

Input Impedance

1MΩ

 Jitter Measurements

Measurement Range

• ×1

2.5T (578ns) to 3.4T (787ns)

• ×2

2.5T (289ns) to 3.4T (393ns)

• ×4

2.5T (145ns) to 3.4T (197ns)

Pulse Compensating Range (Asymmetric variable range)

• ×1

694ns±100ns or over

• ×2

347ns±50ns or over

• ×4

174ns±25ns or over

Meter Indication Mode

SIGMA (Standard deviation) mode

Meter Range

• ×1

30ns and 60ns full scale

• ×2

15ns and 30ns full scale

• ×4

7.5ns and 15ns 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

Judgement Function

Possible to preset the GO/NO-GO threshold value

 Level Characteristics

Measuring Signal

• ×1

3T (694ns±100ns)
11T (2545ns±100ns)

• ×2

3T (347ns±50ns)
11T (1273ns±50ns)

• ×4

3T (174ns±25ns)
11T (636ns±25ns)

Measuring Range

0.025Vp-p to 3Vp-p

Meter Readout Accuracy

±5% at full scale

Judgement Function

Possible to preset the GO/NO-GO threshold value

 Output Characteristics

MONITOR

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

Output Impedance : 75Ω ±10%

JITTER

1Vp-p ±10% of full scale at open circuit

Output Impedance : 600Ω ±10%

RECORDR ;
JITTER & LEVEL

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

Output Impedance : 600Ω ±10%

1V DC ±5% at full scale at open circuit

Output Impedance : 600Ω ±10%

JUDGE;
JITTER & LEVEL

Output of TTL level

 Remote Control Function

(OPTION)

A remote control operation is available

 General Data

Power Requirements

AC100, 115, 215 or 230V ±10%

Dimensions

Approx. 150(W)×220(H)×325(D) mm

Weight

Approx. 4.2kg

*

Specifications are subject to change without notice.