JPS60126893U - 2 wire transmitter - Google Patents
2 wire transmitterInfo
- Publication number
- JPS60126893U JPS60126893U JP1447284U JP1447284U JPS60126893U JP S60126893 U JPS60126893 U JP S60126893U JP 1447284 U JP1447284 U JP 1447284U JP 1447284 U JP1447284 U JP 1447284U JP S60126893 U JPS60126893 U JP S60126893U
- Authority
- JP
- Japan
- Prior art keywords
- output
- output terminals
- capacitor
- switch means
- duty cycle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第1菌は従来の2線式伝送器の一例を示す回路構成図、
第2図は本考案の一実施例を示す回路構成図、第3図は
その動作説明図である。
1・・・変換回路、2・・・演算増幅器、3・・・出力
トランジスタ、4・・・カレントミラー回路、5. 6
−*1スイッチ手段、10・・・第2スイッチ手段、7
・・・比較器、訃・・ノアゲート、9・・・単安定回路
、C□・・・コンデンサ、T1.T2・・・出力端子、
11,1゜・・・伝送線、RL・・・負荷、EB・・・
直流電源。
鴫The first bacterium is a circuit diagram showing an example of a conventional two-wire transmitter,
FIG. 2 is a circuit configuration diagram showing an embodiment of the present invention, and FIG. 3 is an explanatory diagram of its operation. 1... Conversion circuit, 2... Operational amplifier, 3... Output transistor, 4... Current mirror circuit, 5. 6
-*1 switch means, 10... second switch means, 7
... Comparator, ... Noah gate, 9 ... Monostable circuit, C□ ... Capacitor, T1. T2...output terminal,
11,1゜...Transmission line, RL...Load, EB...
DC power supply. Shizuku
Claims (1)
の伝送線を介して遠隔点より給電されると共に、上記伝
送線を流れる電流を測定すべきプロセス量に対応させる
ようにした2線式伝送器において、上記出力端子間に接
続されて上記伝送線を流れる電流を制御する串カトラン
ジスタと、上記出力端子の一方にその一端が接続された
コンディサと、このコンデンサの他端に接続され上記フ
ロセス量に関連したデユーティサイクル信号によって上
記コンデンサを上記伝送線を流れる電流に関連した電流
で充電し又は上記出力端子の一方に放電する第1スイッ
チ手段と、上記コンデンサの端子間電圧を監視して一定
設定値で反転する比較器と、この比較器出力と上記デユ
ーティサイクル信号を入力するゲート回路と、上記デユ
ーティサイクル信号でトリガされる単安定回路と、この
単安定回路出力を上記ゲート回路出力で開閉する第2ス
イッチ手段と、このスイッチ手段の出力を平滑した信号
との差を増幅して上記出力トランジスタを制御する増幅
器とよりなる2線式伝送器。It has a pair of output terminals, and is supplied with power from a remote point via two transmission lines connected to the output terminals, and the current flowing through the transmission lines is made to correspond to the process quantity to be measured. In a wire transmitter, a skewer transistor is connected between the output terminals to control the current flowing through the transmission line, a capacitor has one end connected to one of the output terminals, and a capacitor is connected to the other end of the capacitor. a first switch means for charging or discharging the capacitor with a current related to the current flowing through the transmission line or discharging to one of the output terminals according to a duty cycle signal related to the flow rate; A comparator that monitors and inverts at a constant set value, a gate circuit that inputs the comparator output and the above duty cycle signal, a monostable circuit that is triggered by the above duty cycle signal, and a monostable circuit that inputs the output of this monostable circuit. A two-wire transmitter comprising: second switch means that opens and closes with the output of the gate circuit; and an amplifier that amplifies the difference between a signal obtained by smoothing the output of the switch means and controls the output transistor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1447284U JPS60126893U (en) | 1984-02-03 | 1984-02-03 | 2 wire transmitter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1447284U JPS60126893U (en) | 1984-02-03 | 1984-02-03 | 2 wire transmitter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS60126893U true JPS60126893U (en) | 1985-08-26 |
Family
ID=30499427
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1447284U Pending JPS60126893U (en) | 1984-02-03 | 1984-02-03 | 2 wire transmitter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60126893U (en) |
-
1984
- 1984-02-03 JP JP1447284U patent/JPS60126893U/en active Pending
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