1. Manual End to End Measuring Modes of ELQ 30A+►
Loss Measurement with MTTS ►
Group Delay Distortion Measurement ►
Noise with Tone Measurement ►
Jitter & Frequ. Error Measurement ►
Micro Interruption Measurement ►
Simultaneous Event Counter
To learn more click on the selected topic!
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2. Loss Measurement with Multi Tone Test Signal (MTTS)
ELQ 30A+
ELQ 30A+
ELQ 30A+ in MTTS mode provides:
■ Transmitting 30 to 35 frequencies at the same time
■ Receiving 30 to 35 frequencies at the same time
The advantages of MTTS :
■ Quick and comfortable
■ No synchronization is necessary between transmitter and far end receiver
Selectable
ranges
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3. Group Delay Distortion Measurement
ELQ 30A+
ELQ 30A+
The group delay distortion measurement needs two ELQ 30A+ instruments connected to the ends of the tested line. One of them transmits a test tone the other one receives and evaluates it.
ELQ 30A+ applies:
The multi tone test (MTTS) method described in the recommendation ITU-T O.81 Appendix I.
ELQ 30A+ performs Group delay distortion and level measurements simultaneously.
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4. Noise Measurement with Conditioning Tone
ELQ 30A+
ELQ 30A+
The noise measurement of PCM systems requires an 1020 Hz conditioning tone applied to the far end of the tested line. At the near end where he noise measurement is performed the conditioning tone should be suppressed with an 1020 Hz notch filer.
ELQ 30A+ in Noise with Tone mode provides:
■ Hz conditioning tone generation
■ Noise measurement with Psophometric filter and 1020 conditioning tone
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5. Phase Jitter & Frequency Error Measurement
ELQ 30A+
ELQ 30A+
The jitter and frequency error measurement needs two ELQ 30A+ instruments connected to the ends of the tested line. One of them transmits a jitter free quartz accurate 1020 Hz test tone the other one receives and evaluates it.
ELQ 30A+ performs the two measurements simultaneously according to rec. ITU-T O.91
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6. Micro Interruption Measurement
ELQ 30A+
ELQ 30A+
The interruption analysis needs two ELQ 30A+ instruments connected to the ends of the tested line. One of them transmits 1020 Hz test tone the other one receives it and detects the micro interruptions according to rec. ITU-T O.62. An interruption is detected when the level of the received test tone drops below a designated threshold for more than 0.6 ms.
Short form information
Histogram
List
The measuring time is adjustable between 5 min and 72 hours.
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7. Simultaneous Event Counter
The event test needs two ELQ 30A+ instruments connected to the ends of the tested pair. One of them transmits a test tone the other one receives it and simultaneously counts the number of events like:
■ Amplitude hits (described in rec. ITU-T O.95)
■ Phase hits (described in rec. ITU-T O.95)
■ Interruptions (described in rec. ITU-T O.61)
■ Noise impulses (described in rec. ITU-T O.71)
ELQ 30A+
ELQ 30A+
Measuring times:
5, 15, 30, 60 min
Maximum count:
65000 for each counter
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