廠家: 美國惠普
該儀表可在704Kbit/S,2,8,&34Mbit/s各速率上按G.821要求進行誤碼分析,也可對2,8,&34Mbit/s信號進行抖動測試。可自動進行輸入抖動容限和抖動傳遞函數測試并自動繪出相應曲線,利用內部合成源可以對1Kbit/s到50Mbit/s的信號進行測試。
HP3784A可用選件的DS1，DS1C，和DS2和DS3，以北美速率（North Amerian rates）取代標準速率。另外它具有用于高達50Mb/s測量的TTL/ECL接口，使用的內部時鐘合成器。可以得到用于SONET的特殊選配件，以用于STS1，DS3，DS1C的誤碼和抖動測量。HP3784A便于把測量與預置值、自動接收機裝置和錯誤性能通過/失敗門限值一起使用。自動抖動偏差和模板子程序用作快速精確測試，達到CCITT極限值。直通數據方式能夠把抖動附加到成幀信號，以用于解復用器抖動容限的測試。
測量功能概要
一、誤碼分析功能
Error count, error ratio, error and error-free intervals (seconds and
deciseconds), percent unavailability, percent errored and percent
severely-errored seconds, percent degraded minutes. All measurements are made
simultaneously.
二、抖動分析功能
Peak-to-peak amplitude(峰-峰幅度), jitter-hit count(抖動-沖擊數), jitter-hit and hit-free
seconds or deciseconds(抖動沖擊和無沖擊秒).
HP3784A is a portable error performance/jitter test set, offering standard telecom interfaces at 704 kb/s, 2, 8, and 34 Mb/s, with the option of codirectional interfaces at 64 kb/s and V.11 interfaces for testing X.21 leased circuits. In addition, it has binary TTL/ECL interfaces for measurements up to 50 Mb/s, using the internal clock synthesizer.
HP3784A is easy to use with measurement presets, automatic receiver setup and error performance pass/fail thresholds. Automatic jitter tolerance and transfer plotting routines are provided for fast accurate testing up to and beyond CCITT limits. Through-data mode allows jitter to be added to a structured signal for jitter tolerance testing of demultiplexers.
應用
特殊選件
Special versions offer error and jitter measurements at North American and binary interfaces, using unframed data. They provide all the features of the standard instrument with North American data rates, DS1 (1.544 Mb/s), DS1C (3.152 Mb/s), DS2 (6.312 Mb/s) and DS3 (44.736 Mb/s), replacing the European data rates. Another version offers STS1 (51.84 Mb/s) for testing SONET equipment.
Automatic and manual jitter measurements offer a fast, accurate means of characterizing digital transmission equipment. In addition, jitter can be added to any standard data signal passing through the instrument to allow testing of demultiplexers with a framed signal.
| 選件清單 (注意:不能同時選002和006) |
| opt002 抖動測量 |
| opt006 64 kb/s measurement and V.11 interfaces |
| opt008 Error and jitter measurements at DS1, DS1C, DS2, and DS3 |
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