Application Notes for Frequency Division Multiplex System Testing with ET 92

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Basic, Super & Master Group

Voice Frequency Noise

END to END Measurements

Pilot Level Measurement

Noise Level Measurement

Level Measurement in Tracking Mode

Impulsive Noise Measurement

Psophometric Noise Measurement

Frequency Response Test with MTTS

Group Delay Distortion

Micro Interruption Analysis

Jitter and Frequency Difference

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Signal Level Measurement in Signal Level Measurement in Transmitter Tracking Mode ofTransmitter Tracking Mode of ET 9ET 922

Changing the transmitter frequency (Tx) the receiver automatically follows the change according to the selected rule:Rx=CARRIER+Tx or CARRIER-Tx

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Noise Level Measurement at Master Group with ET 92

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Pilot Level Measurement at Super Group with ET 92

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Pilot Frequency Allocation Schematics

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Psophometric Noise Level Measurement with ET 92

Display format up to 1 min Display format over 1 min

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Impulsive Noise Measurement with ET 92

Display format up to 30 sec Display format over 30 sec

An impulse is counted when the received noise signal exceeds a preset threshold for more than 500 ns

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Frequency Response Test of ET 92 with MTTS Method

MTTS METHOD:The transmitter generates 36 test tones ■ Frequency range: 100 to 3600 Hz ■ Frequency step: 100 Hz ■ Level: -20 dBm / frequencyThe receiver measures the 36 test tones simultaneously

ADVANTAGES: ■ No synchronisation is necessary between the two instruments ■ The measuring time is shorter than that of other methods

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Micro Interruption Analysis with ET 92

An interruption is detected when the level of test tone drops below a designated threshold for

more than 0,6 ms. The detected interruptions are included into five categories by duration

▼Click here to see the test resultsIn graphic and numeric forms

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Detailed Results of Micro Interruption Analysis

All the test results are available also in numeric form and they can be transferred to PC via USB interface.

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Group Delay Distortion Measurement with ET 92

ET 92 applies the multi tone test method described in Recommendation ITU-T O.81 Appendix IThe transmitter generates 36 test tones ■ Frequency range: 100 to 3600 Hz ■ Frequency step: 100 Hz ■ Level: -20 dBm / frequencyThe receiver measures the 36 test tones simultaneously

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Phase Jitter and Frequency Difference Measurement

ET 92 performs jitter and frequency error measurements simultaneously according to Recommendation ITU-T O.91That measurement needs two instruments connected to the ends of the tested line.■ One of them transmits jitter free quartz accurate 1020 Hz test tone■ The other one receives and evaluates it

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