MJM-631C CD JITTER METER

< DESCRIPTION >

The MJM-631C is designed for measuring the time jitter in the 3T component of the EFM modulated signal of CD Players and other devices. It extracts the 3T component of the EFM signal and measures the jitter in real time. It also indicates GO or NO-GO with lamps according to preset GO/NO-GO threshold values and displays the results on the meter.
In addition, measurements at high speed are possible since the T/V conversion method is employed.

< FEATURES >

1. The 3T jitter of the EFM signal can be read directly form the meter.

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

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

4. A GO/NO-GO result is indicated in relation to a preset jitter threshold value.

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. A jitter output connector enables the jitter waveform to be observed on an oscilloscope.

8. A remote control function is provided.

SPECIFICATIONS

Input Section

Input Signal EFM signal (eye-pattern)  Clock frequency  4.3218MHz

Level Range  0.1Vp-p to 5Vp-p

Input Impedance  Approx. 1M Ohm

Jitter Measurements

Measurement Range  2.5T (578nsec) to 3.4T (787nsec)

Pulse Compensating Range  (Asymmetric variable range) 694nsec ±100nsec

Meter Indication Mode  SIGMA (Standard deviation) mode

Meter Range  30nsec and 60nsec of full scale

Meter Readout Accuracy  ±3% of full scale

Polarity of Input  Signal Positive or Negative, selectable

Residual Jitter  Less than 2nsec

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

Output Section

MONITOR output  ±5% of input level at open circuit

Output impedance  Approx. 75 Ohm

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

Circuit output impedance  Approx. 600 Ohm

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

Output impedance  Approx. 600 Ohm

Remote Control Function A remote control operation is available

General Date

Operating Temperature  0ºC to 40ºC

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

Power Consumption  Approx. 20VA

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

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