ST220安全智能查線儀是在普通電話機的基礎上，增加了障礙測試、自主振鈴、呼叫用戶、對線、高壓保護和高壓驗電等功能，有效地降低了線路維護人員的工作量，堅固耐用是線路維護人員開通和維護相關業務的理想工具。 

功能簡介 

1、 電話機功能：同普通電話機一樣，接于電話線上，具有撥號、通話、收鈴功能。

2、 障礙測試功能：將測試線接于無源待測用戶線上，可進行絕緣測試、地氣測試和斷線測試。

3、 呼叫用戶和對講：將測試線接于無源待測用戶線上，即可振鈴用戶電話機，據此核實線路的修復情況。

4、 對線對講功能：用ST220（稱甲方）和任意查線機（稱乙方）可通過對講完成對線工作。

5、 直流高壓保護及高壓驗電功能。

6.特制測試大夾子，6P標準接口

技術指標

1、 絕緣測試阻值0-10MΩ分四檔指示。

2、 振鈴呼叫距離：≤1KM。

3、 斷線分辨距離：≤3KM。

4、 感應驗電距離:220V≥0.1m;10KV≥4m；35KV≥8m

5、 撥號指標符合GB/T15279-2002要求。

6、 直流保護電壓：60V-300V。

6、 電源：普通9V層疊電池。

7、 體積：146mmх54mmх37mm.

8、 重量：≤220g. 

ST220 Telephone line checker

It is on the basis of the ordinary telephones, added the functions of testing obstacles, independent ringing, calling users on the line,High-pressure remind , and high-voltage protection functions. Effectively reduce the workload of line maintenance personnel. With ruggedness it is an ideal business tool for maintenance personnel to open and maintain the related businesses.

Functions introduction:

Telephone function: The same as ordinary telephones, it acquires dial-up call, or bell functions once connect with ordinary telephone lines.

Barriers testing functions: connect the testing line and the users’ line, insulation tests, and gas testing and line broken testing can be carried out.

Call users and Talkback: once connect the testing line and the users’ line, and call users’ telephone, which can verify the restoration lines.

Talkback functions: connect ST220 (Part A) with any Check Machine（Part B）can complete line connection through talkback.

DC high voltage protection,ACHigh-pressure remind

Specifications:

Insulation testing resistance value of 0-10MΩ at 4th grade instructions

Call distance:≤1 km

Disconnection distinguish distance: ≤ 3 km

Dial indicators meet GB/T15279-2002

DC protection voltage: 60v-300v

Power supply: 9 V ordinary batteries

Dimension (mm): 146×54×37

Weight: ≦220g