JITTER METER
< DESCRIPTION >
The MDJ-6370 is designed for measuring the jitter in
the 3T component of the EFM modulated signal of DVD (×6), CD players, CD-ROM
drivers and other devices at ×1, DVD (×6) and ×12 speed. 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. ×1, DVD (×6) and ×12 speed measurements are
selectable on the front panel.
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. A GO/NO-GO result is indicated in relation to a preset jitter threshold
value.
6. The polarity of the 3T measurement can be selected (positive-going or
negative-going)
7. Improvements in the compensation circuit for the period have resulted in
highly stable operation when the signal
is in the asymmetrical condition.
8. A jitter output connector enables the jitter waveform to be observed on an
oscilloscope.
9. A remote control function is provided.
SPECIFICATIONS
Jitter
Measurements |
| Measurement Speed |
| ×1, DVD, ×12 speed (selectable by RPM switch) |
| 3T Center Frequency ×1 720.3kHz |
| DVD(×6) 4.500MHz ×12 8.6436MHz |
| Max, Speed deviation Range |
| ±5% at 3T center frequency |
| Measurement Range ×1 ~ 30ns in 1ns |
| DVD(×6) ~ 9ns in 0.2ns ×12 ~ 3ns in 0.1ns |
| Measurement Accuracy |
| [3% of f. s. at ×1 ] [5% of f. s. at DVD(×6) and ×12] |
| Polarity of Input Signal |
| Positive or Negative of 3T signal, selectable |
| Pulse Compensating Range |
| Less than ±0.5T of the prescribed speed |
| (Asymmetric variable range) |
|
Output
Characteristics |
| RECORD output 1V f.s. |
| JITTER output ±1V at 0.5T |
| MONITOR output ±10% of Input signal |
|
Input Characteristics |
| Input Signal EFM signal (HF or Logic signal) |
| Level Range 0.1Vp-p ~ 5 Vp-p (3T) |
| Input Impedance Approx. 1M Ohm |
| Input Capacitance Less than 25pF |
|
|
General Date |
| Operating Temperature 5ºC to 35ºC |
| Power Requirement |
| 85 ~ 235V AC ±10%, 50Hz ~ 60Hz |
| Dimensions & Weight |
| Approx. 150(W) × 220(H) × 325(D)mm, 3.9kg |