MJM-631E CD Jitter Meter

* End of sales

This MJM-631E can measure the time jitter in the 3T component of EFM modulated signals of CD players and other devices.
It separates and extracts 3T components in EFM signals, measures the jitter quantity in real time, and displays the measuring results by the meter, and LCD display.
Its T/V conversion system ensures high-speed measurement.
By resetting the judging value, whether the measuring results are acceptable (GO) or not (NO) can be displayed by LED.

FEATURES

The 3T jitter quantity in EFM signals can be directly read by the meter and LCD display.

The jitter quantity is displayed by the standard deviation (Sigma).

Since the jitter quantity is measured by the T/V conversion system, the jitter fluctuation quantity can be read continuously.

The measured jitter quantity is compared with its preset value to be able to judge whether it is acceptable (GO) or not (NO).

Measurement can be done at either falling or rising polarity of the 3T signal.

Owing to its improvements in the compensation circuit for the period, stable measurement can be done to asymmetric signals.

This unit can be remote-controlled by control signals.

This unit is a compact and lightweight jitter meter.

SPECIFICATIONS

 Input section

Input signal

EFM signal (eye pattern)

Clock frequency

4.3218MHz

Input level range

0.1Vp-p to 5Vp-p

Input impedance

Approx. 1MΩ

 Measuring section

Measuring range

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

Pulse width compensation range

694ns±100ns or over

Indicating system

Sigma indication system

Range

30ns and 60ns full scale

Measuring accuracy

• Meter display

±3% of full scale

• Digital display

±(2% of reading +3 digits)

Min. resolution; 0.1ns

Measuring signal polarity

Either positive or negative polarity is selectable

Residual jitter

Less than 2ns

Judgment function

To set from 0 to 60ns by the panel preset function

 Output section

MONITOR

±5% of input signal (open end)

Output impedance 50Ω ±10%

RECORDER

Each range meter full scale 1VDC ±3% (open end)

Output impedance 600Ω ±10%

REMOTE

Functions other than FUNCTION on the panel can be controlled from the exterior.
A judgment output function is provided.

 Others

Operating temperature range

0ºC to +40ºC

Power requirements

AC100/120 to 220/240V, 5VA

Dimensions

Approx. 240 (W)×154 (H)×137 (D) mm

Weight

Approx. 1.95kg

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Specifications are subject to change without notice.