Voice Channel Characteristic Analyzer

Product Description

Product Description

DDA260 Channel Analyzer is a multifunctional portable channel measurement product based on DSP, colorful LCD displaying in Chinese which develop by our company.

DDA260 is capable of analyzing A-A, A-D, D-A, D-D modes level, Variation of gain with frequency, Variation of gain with input level, Crosstalk(far-end crosstalk and near-end crosstalk), Idle channel noise and Total distortion including quantizing distortion. It supports PCM30, PCM31, PCM30CRC,

PCM31CRC, etc. And display in colorful graphics panel. Two referenced testing signal 820Hz and 1020Hz are supported, 2M transmission system bit error can be tested and it is capable of telecontrol.

Main features

Full accesses A-A (Analog- Analog) measuring

Measuring point: Two lines or four lines audio interface.

Two lines interface provide the functions of feeder and cycle

Input/output resistance: 600Ω; Measuring subjects: Level, Variation of gain with frequancy, Variation of gain with input level, crosstalk (far-end crosstalk and near-end crosstalk), idle channel noise and Total

Distortion including quantizing distortion.
Loop-back test, separate test can be testing automatically and store 1500 testing results. The results can be send and backup by computer. Each automatic testing only need 1 minute.

Measuring process will be automatically compared with the ITU-I proposed analyzing result. There can be identify by noise warning and marks when the guideline is being surpass. The panel displays the testing result.
Several mode can be select by the user such as manual measuring, single or multiple

Automatic measuring, all subjects automatic measuring
Sending Sine signal frequency 200--3600Hz, step width 1Hz, the frequency error is less than 0.2Hz, the error of Variation of gain with frequency is less than 0.1Db.
Rating of signal output -72.5--+11dBm, operation error is less than 0.1dB