Transcript 1. dia - Elektronika

Single Ended Measuring Modes of ELQ 30A
Transmitting
Receiving Modes
Spectrum Analyzer
Wide Band Noise Measurement
Impulse Noise Measurement
NEXT Measurement
Micro Interruption Measurement
Single Ended Loss Measurement
Echo Test
Impedance Measurement
Return Loss Measurement
LCL Balance Measurement
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Transmitting Modes of ELQ 30A
ELQ 30A provides three transmitting modes:
■ 1 FREQ (Transmitting of one single frequency )
■ MTTS (Transmitting 30 to 35 frequencies simultaneously)
■ WHITE NOISE (Transmitting white noise)
1 FREQ mode
■ Range: 200 Hz to 30 MHz
■ Resolution: 1 Hz
MTTS mode
Selectable ranges:
WHITE NOISE mode
Frequency range: up to 30 MHz
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Receiving Modes of ELQ 30A
ELQ 30A provides three receiving modes:
■ 1 FREQ (Measuring of one single frequency )
■ MTTS (Measuring 30 to 35 frequencies simultaneously)
■ WIDE EBAND (Wide band measurement with selectable filters)
1 FREQ mode
■ Range: 200 Hz to 30 MHz
■ Resolution: 1 Hz
MTTS mode
Selectable ranges:
WIDE BAND mode
Selectable filters:
Selectable bandwidths:
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Spectrum Analyser Measurement
Spectrum analyser of ELQ 30A is intended to:
■ Noise Spectrum Measurement on Passive Lines
■ PSD Spectrum Measurement on Working Lines
In this case the test instrument should be connected parallel to the line with high impedance.
The digital systems are extremely sensitive for the capacitive load therefore the regular
measuring cables can not be used. For line connection an optional active probe is provided:
Selectable ranges:
Selectable evaluation modes:
■ Normal
■ Slipping average (Average
of the last 10 measurements)
■ Average
■ Peek
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Wideband Noise Measurement
The impairment of communication caused by noises does not depend only on the level but also
on the time distribution of noise. The proper measuring time depends on the nature of noise.
In case of a quasi stationer noise 1 to 10 sec is enough. If the noise level is slowly changing, a
longer measurement time provides the proper test result.
When the selected measuring time >1 min then ELQ 30A displays the noise level in histogram
Selectable filters:
Selected duration
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Impulse Noise Measurement
Impulse noise is a non-stationary cross talk from electromagnetic events in the vicinity of phone
lines. Any burst of noise that produces a voltage exceeding the power level of the background
noise by more than 12dB is declared impulse noise.
An impulse is counted when the received signal exceeds a preset threshold for more than 500 ns.
When the selected measuring time >30 sec then ELQ 30A displays the noise level in histogram
Selected duration
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Near End Crosstalk (NEXT) Measurement
ELQ 30A provides two NEXT measuring modes:
■ Measurement at one single frequency
■ Measurement in sweep mode
Selectable ranges:
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Micro Interruption Measurement (Loop Back Mode)
Micro interruption measurement can be performed with one ELQ 30A in loop back mode
transmitting 1020 Hz test tone on connector L2 and receiving on connector L1
ELQ 30A 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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Single Ended Loss Estimation
ELQ 30A provides insertion loss estimation using a special FDR/TDR combination
without any far end device. Single ended loss measurement can be performed if:
■ The tested loop is open
■ There is a strap on the far end of the tested pair
■ A telephone hand set is connected to the far end
Selectable ranges:
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Echo Test
There are several reasons for the undesirable quality degradation and the appearance of
audible echoes is one of them. This kind of quality degradation is inherent in the network
equipment and the end user phone devices.
For the test of the disturbing echoes ELQ 30A transmits short ~1020 Hz signal packets
with proper amplitude shaping and measures the amplitude and the traveling time of the
reflected signal.
Time [s]
ELQ 30A
Measuring ranges
■ Traveling time range: 15 to 1500 ms
■ Time resolution: 5 ms
■ Amplitude indication: down to -60 dBm
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Impedance Measurement
ELQ 30A provides impedance measurement without any external adapter
Two impedance measuring modes are available:
■ Measurement at one single frequency
■ Measurement in sweep mode
Frequency ranges:
Impedance display range:
■ up to 20 kHz: 2000 Ohm
■ over 20kHz: 600 Ohm
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Return Loss Measurement
ELQ 30A provides return loss measurement without any external adapter
Two return loss measuring modes are available:
■ Measurement at one single frequency
■ Measurement in sweep mode
Return loss factor indicates the deviation of line impedance from the nominal value.
ELQ 30A compares the line impedance to an internal Rn normal resistor.
Frequency ranges:
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Balance (LCL) Measurement
ELQ 30A provides LCL measurement without any external adapter
using the test circuit described in ITU-T Rec. 0.9
Two balance measuring modes are provided:
■ Measurement with one single frequency
■ Measurement in sweep mode
Frequency ranges:
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