JP2019204158A - Portable terminal device - Google Patents
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Abstract
Description
本発明は、伝送器と双方向デジタル通信を行なう可搬型端末装置に関する。 The present invention relates to a portable terminal device that performs bidirectional digital communication with a transmitter.
計装機器として２線式伝送器が広く用いられている。２線式伝送器は、伝送線を介して電源の供給を受け、プロセス変数等の物理量を、例えば４−２０ｍＡのアナログ電流信号に変換して伝送線に伝える。従来から、伝送線に変調通信信号を重畳することによって、２線式伝送器と双方向デジタル通信をするハイブリッド伝送方式が実用化されている。 Two-wire transmitters are widely used as instrumentation equipment. The two-wire transmitter receives power supply via the transmission line, converts a physical quantity such as a process variable into an analog current signal of 4-20 mA, for example, and transmits the analog current signal to the transmission line. 2. Description of the Related Art Conventionally, a hybrid transmission system that performs bidirectional digital communication with a two-wire transmitter by superimposing a modulated communication signal on a transmission line has been put into practical use.
図４は、ハイブリッド伝送方式に対応した２線式伝送器３１０の接続例を示している。本図において、２線式伝送器３１０は、ループ状の伝送線３２０を介してディストリビュータ３３０から２４ＶＤＣの電源供給を受け、物理量に対応した４−２０ｍＡのアナログ電流信号を伝送線３２０に流す。 FIG. 4 shows a connection example of the two-wire transmitter 310 corresponding to the hybrid transmission method. In this figure, a two-wire transmitter 310 receives a 24 VDC power supply from a distributor 330 via a loop-shaped transmission line 320 and passes an analog current signal of 4-20 mA corresponding to a physical quantity to the transmission line 320.
２線式伝送器３１０のパラメータを確認したり、設定変更等を行なう場合に、ハンドヘルドターミナルと呼ばれる可搬型端末装置が用いられる。ハンドヘルドターミナル４００は、メモリ４１０、入力部４２０、表示部４３０、受信部４４１と送信部４４２を含んだ通信部４４０、制御部４５０、電源部４６０を備えており、２線式伝送器３１０と双方向のデジタル通信を行なう。 A portable terminal device called a handheld terminal is used when checking parameters of the two-wire transmitter 310 or changing settings. The handheld terminal 400 includes a memory 410, an input unit 420, a display unit 430, a communication unit 440 including a reception unit 441 and a transmission unit 442, a control unit 450, and a power supply unit 460. Digital communication.
２線式伝送器３１０とハンドヘルドターミナル４００との接続は、ケーブルを介した金属接触が一般的であり、例えば、クリップ式のケーブル等を用いて、２線式伝送器３１０の接続端子に伝送線３２０と並列に接続する。あるいは、ディストリビュータ３３０の接続端子や伝送線３２０の中間端子等に接続する場合もある。 The connection between the two-wire transmitter 310 and the handheld terminal 400 is generally metal contact via a cable. For example, a clip-type cable or the like is used to connect the transmission line to the connection terminal of the two-wire transmitter 310. 320 is connected in parallel. Alternatively, it may be connected to a connection terminal of the distributor 330, an intermediate terminal of the transmission line 320, or the like.
ハンドヘルドターミナル４００を用いて、ループ電流チェック等を行なう場合には、伝送線３２０を流れる電流を測定する必要がある。この場合、例えば、別途電流計等を用意して伝送線３２０を流れる電流の計測を行なう。電流計としては、例えば、非接触型電流計５００が用いられる。非接触型電流計５００は、ホール素子、フラックスゲート等を利用した電流計であり、伝送線３２０をクランプした状態で電流を測定することができる。 When performing a loop current check or the like using the handheld terminal 400, it is necessary to measure the current flowing through the transmission line 320. In this case, for example, an ammeter or the like is separately prepared and the current flowing through the transmission line 320 is measured. For example, a non-contact type ammeter 500 is used as the ammeter. The non-contact type ammeter 500 is an ammeter using a Hall element, a flux gate, or the like, and can measure a current with the transmission line 320 clamped.
従来のハンドヘルドターミナル４００は、２線式伝送器３１０と通信を行なうために、ケーブル等を介して端子と金属接触を行なわなくてはならず、取り付け作業や取り外し作業の手間を要していた。また、作業者の誤配線や誤操作のおそれもあった。さらに、ハンドヘルドターミナル４００を利用してループ電流チェック等を行なう場合には、別途電流計等を用意しなければならず、装置管理が煩雑となっていた。このため、ハンドヘルドターミナル４００の利便性が十分高いとはいえなかった。 In order to communicate with the two-wire transmitter 310, the conventional handheld terminal 400 has to make a metal contact with the terminal via a cable or the like, which requires time and effort for attachment and removal. There is also a risk of operator miswiring and misoperation. Furthermore, when the loop current check or the like is performed using the handheld terminal 400, an ammeter or the like must be separately prepared, which makes the device management complicated. For this reason, it cannot be said that the convenience of the handheld terminal 400 is sufficiently high.
そこで、本発明は、伝送器とデジタル通信を行なう可搬型端末装置の利便性を高めることを目的とする。 Accordingly, an object of the present invention is to improve the convenience of a portable terminal device that performs digital communication with a transmitter.
上記課題を解決するため、本発明の可搬型端末装置は、伝送器に接続された伝送線をクランプ可能な磁性体コアを含み、前記伝送線を流れる電流に基づく電流信号を出力する電流検出部と、前記電流信号の交流成分を受信する受信部と、前記伝送器との通信用デジタル信号を出力する送信部と、前記送信部と接続し、前記磁性体コアに巻かれた送信信号印加用巻線と、を備えたことを特徴とする。
ここで、前記電流信号の直流成分に基づいて、前記伝送線を流れる直流電流の電流値を測定する電流測定部を備えていてもよい。
このとき、前記通信用デジタル信号として、所定の電流値の電流を出力させる指示を出力し、前記指示と前記電流測定部の測定結果とに基づいて前記伝送器の出力電流精度診断を行なう精度診断部を備えていてもよい。
また、前記磁性体コアは、第１部材と第２部材とに分割され、ヒンジ機構により前記第１部材に対して前記第２部材が開閉可能とすることができる。
In order to solve the above problems, a portable terminal device according to the present invention includes a magnetic core capable of clamping a transmission line connected to a transmitter, and outputs a current signal based on a current flowing through the transmission line. A transmitter for receiving an alternating current component of the current signal, a transmitter for outputting a digital signal for communication with the transmitter, and a transmitter for applying a transmission signal connected to the transmitter and wound around the magnetic core And a winding.
Here, a current measurement unit that measures a current value of a direct current flowing through the transmission line based on a direct current component of the current signal may be provided.
At this time, as the communication digital signal, an instruction for outputting a current of a predetermined current value is output, and an accuracy diagnosis for performing an output current accuracy diagnosis of the transmitter based on the instruction and a measurement result of the current measuring unit May be provided.
The magnetic core may be divided into a first member and a second member, and the second member can be opened and closed with respect to the first member by a hinge mechanism.
本発明によれば、伝送器とデジタル通信を行なう可搬型端末装置の利便性を高めることができる。 ADVANTAGE OF THE INVENTION According to this invention, the convenience of the portable terminal device which performs digital communication with a transmitter can be improved.
本発明の実施の形態について図面を参照して説明する。図１は、本発明の可搬型端末装置の実施形態である非接触型のハンドヘルドターミナル１００の使用状態を示す図である。図中の２線式伝送器３１０とディストリビュータ３３０は、従来と同様である。 Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a use state of a non-contact type handheld terminal 100 which is an embodiment of a portable terminal device of the present invention. The two-wire transmitter 310 and the distributor 330 in the figure are the same as in the prior art.
上述のように、２線式伝送器３１０は、アナログ電流信号にデジタル信号を重畳して双方向通信を行なうハイブリッド伝送方式に対応している。２線式伝送器３１０は、ループ状の伝送線３２０を介してディストリビュータ３３０から２４ＶＤＣの電源供給を受け、物理量に対応した４−２０ｍＡのアナログ電流信号を伝送線３２０に流す。 As described above, the two-wire transmitter 310 is compatible with a hybrid transmission method in which a digital signal is superimposed on an analog current signal to perform bidirectional communication. The two-wire transmitter 310 is supplied with 24 VDC power from the distributor 330 via the loop-shaped transmission line 320, and causes a 4-20 mA analog current signal corresponding to the physical quantity to flow through the transmission line 320.
非接触型のハンドヘルドターミナル１００は、伝送線３２０をクランプする機構を備えており、２線式伝送器３１０と非接触で双方向のデジタル通信を行なうことができる。また、ハンドヘルドターミナル１００は、伝送線３２０を流れる電流を非接触で測定することができる。 The contactless handheld terminal 100 includes a mechanism for clamping the transmission line 320, and can perform two-way digital communication with the two-wire transmitter 310 without contact. Further, the handheld terminal 100 can measure the current flowing through the transmission line 320 in a non-contact manner.
図２は、ハンドヘルドターミナル１００の構成を示す図である。本図に示すように、ハンドヘルドターミナル１００は、ＣＰＵ等で構成された制御部１１０、メモリ１２０、操作キー等を含んだ入力部１３０、液晶ディスプレイ等の表示部１４０、アナログ電流信号をデジタル信号に変換するＡ／Ｄ変換部１５０、ハイブリッド伝送のデジタル信号を受信する受信部１６０、ハイブリッド伝送のデジタル信号を送信する送信部１７０、電源部１８０、非接触交信部１９０、コンデンサＣ１を備えている。 FIG. 2 is a diagram illustrating a configuration of the handheld terminal 100. As shown in the figure, the handheld terminal 100 includes a control unit 110 configured by a CPU, a memory 120, an input unit 130 including operation keys, a display unit 140 such as a liquid crystal display, and an analog current signal as a digital signal. An A / D converter 150 for conversion, a receiver 160 for receiving a digital signal of hybrid transmission, a transmitter 170 for transmitting a digital signal of hybrid transmission, a power supply unit 180, a non-contact communication unit 190, and a capacitor C1 are provided.
制御部１１０は、ハンドヘルドターミナル１００における各種処理の制御を行なう。例えば、ハイブリッド伝送におけるデジタル信号の送受信制御を行なう。本実施形態において、制御部１１０は、電流測定部１１１、精度診断部１１２を備えている。電流測定部１１１は、Ａ／Ｄ変換部１５０の出力信号に基づいて伝送線３２０を流れる電流を測定し、精度診断部１１２は、２線式伝送器３１０が出力する４−２０ｍＡのアナログ電流信号の精度を診断する。精度診断部１１２が行なう２線式伝送器３１０の出力電流精度診断の詳細については後述する。 The control unit 110 controls various processes in the handheld terminal 100. For example, digital signal transmission / reception control in hybrid transmission is performed. In the present embodiment, the control unit 110 includes a current measurement unit 111 and an accuracy diagnosis unit 112. The current measuring unit 111 measures the current flowing through the transmission line 320 based on the output signal of the A / D conversion unit 150, and the accuracy diagnosis unit 112 is a 4-20 mA analog current signal output from the two-wire transmitter 310. Diagnose the accuracy of Details of the output current accuracy diagnosis of the two-wire transmitter 310 performed by the accuracy diagnosis unit 112 will be described later.
非接触交信部１９０は、磁性体コア１９１、ホール素子１９２、増幅器１９３、送信信号印加用巻線１９４を備えている。磁性体コア１９１とホール素子１９２と増幅器１９３とで電流検出部を構成している。 The non-contact communication unit 190 includes a magnetic core 191, a Hall element 192, an amplifier 193, and a transmission signal applying winding 194. The magnetic core 191, the Hall element 192, and the amplifier 193 constitute a current detection unit.
磁性体コア１９１は、開閉機構を備えており、伝送線３２０をクランプ可能に構成されている。具体的には、第１磁性体部材１９１ａと、第２磁性体部材１０１ｂに分割され、第１磁性体部材１９１ａの一端に設けられたヒンジ部１９１ｄにより、第２磁性体部材１９１ｂが開閉できるようになっている。これにより、容易に伝送線３２０をクランプすることができる。 The magnetic core 191 includes an opening / closing mechanism and is configured to be able to clamp the transmission line 320. Specifically, the second magnetic member 191b can be opened and closed by a hinge portion 191d which is divided into a first magnetic member 191a and a second magnetic member 101b and is provided at one end of the first magnetic member 191a. It has become. Thereby, the transmission line 320 can be easily clamped.
第１磁性体部材１９１ａには、送信信号印加用巻線１９４が巻かれており、第２磁性体部材１０１ｂにスリット１９１ｃが形成されている。ただし、送信信号印加用巻線１９４、スリット１９１ｃ、ヒンジ部１９１ｄの配置箇所については一例であり、本図の例に限られない。 A transmission signal applying winding 194 is wound around the first magnetic member 191a, and a slit 191c is formed in the second magnetic member 101b. However, the arrangement positions of the transmission signal applying winding 194, the slit 191c, and the hinge portion 191d are merely examples, and the present invention is not limited to the example in this figure.
スリット１９１ｃにはホール素子１９２が配置されている。ホール素子１９２が検出した磁束密度に対応する電圧は、増幅器１９３で増幅される。このため、増幅器１９３は、伝送線３２０を流れる電流に対応した信号を出力することになる。 A Hall element 192 is disposed in the slit 191c. A voltage corresponding to the magnetic flux density detected by the Hall element 192 is amplified by the amplifier 193. For this reason, the amplifier 193 outputs a signal corresponding to the current flowing through the transmission line 320.
なお、電流検出方式は一例であり、ホール素子１９２に代え、フラックスゲート等の磁電変換素子を用いてもよいし、ゼロフラックス方式等の非接触電流検出方式を採用してもよい。 The current detection method is an example, and a magnetoelectric conversion element such as a flux gate may be used instead of the Hall element 192, or a non-contact current detection method such as a zero flux method may be employed.
増幅器１９３が出力する信号は、コンデンサＣ１とＡ／Ｄ変換部１５０とに導かれる。受信部１６０は、コンデンサＣ１を介して信号の交流成分を受信し、制御部１１０に信号の交流成分を入力する。この交流成分は、ハイブリッド伝送のデジタル信号に相当するため、受信部１６０は、２線式伝送器３１０が出力するデジタル信号を受信して、制御部１１０に伝送することができる。 The signal output from the amplifier 193 is guided to the capacitor C1 and the A / D converter 150. The receiving unit 160 receives the AC component of the signal via the capacitor C <b> 1 and inputs the AC component of the signal to the control unit 110. Since this AC component corresponds to a digital signal of hybrid transmission, the receiving unit 160 can receive the digital signal output from the two-wire transmitter 310 and transmit it to the control unit 110.
Ａ／Ｄ変換部１５０に入力された信号は、デジタル変換され制御部１１０に入力される。この信号に含まれる直流成分は、４−２０ｍＡのアナログ電流信号に相当する。この直流成分に基づいて、制御部１１０の電流測定部１１１は、伝送線３２０を流れる４−２０ｍＡアナログ電流信号の電流値を測定する。測定結果は、メモリ１２０に記録したり、表示部１４０に表示することができる。 The signal input to the A / D converter 150 is digitally converted and input to the controller 110. The DC component contained in this signal corresponds to an analog current signal of 4-20 mA. Based on this DC component, the current measurement unit 111 of the control unit 110 measures the current value of the 4-20 mA analog current signal flowing through the transmission line 320. The measurement result can be recorded in the memory 120 or displayed on the display unit 140.
送信信号印加用巻線１９４は、送信部１７０に接続され、磁性体コア１９１に巻かれている。送信部１７０が出力するハイブリッド伝送のデジタル信号に基づいて、磁性体コア１９１内で磁束が変化する。この磁束の変化により、磁性体コア１９１がクランプしている伝送線３２０に起電力が発生し、ハイブリッド伝送のデジタル信号が２線式伝送器３１０に伝わることになる。 The transmission signal application winding 194 is connected to the transmission unit 170 and wound around the magnetic core 191. The magnetic flux changes within the magnetic core 191 based on the hybrid transmission digital signal output from the transmitter 170. Due to this change in magnetic flux, an electromotive force is generated in the transmission line 320 clamped by the magnetic core 191, and a digital signal of hybrid transmission is transmitted to the two-wire transmitter 310.
次に、制御部１１０の精度診断部１１２が行なう２線式伝送器３１０の出力電流精度診断について図３のフローチャートを参照して説明する。出力電流精度診断は、２線式伝送器３１０に所定の電流値を出力させるように指示したときに、実際に出力される電流値の精度を判定する処理である。 Next, the output current accuracy diagnosis of the two-wire transmitter 310 performed by the accuracy diagnosis unit 112 of the control unit 110 will be described with reference to the flowchart of FIG. The output current accuracy diagnosis is a process of determining the accuracy of the current value that is actually output when the two-wire transmitter 310 is instructed to output a predetermined current value.
出力させる電流値は、例えば、４ｍＡ間隔で、４、８、１２、１６、２０ｍＡの５通りからなるパターンとすることができる。もちろん、これに限られず、２ｍＡ間隔の９通りからなるパターンとしたり、８ｍＡ間隔の３通りからなるパターン等としてもよい。本実施形態では、出力電流値パターンを任意に設定できるようにしている（Ｓ１０１）。ただし、出力電流値パターンは固定であってもよい。 The output current value can be, for example, a pattern consisting of five patterns of 4, 8, 12, 16, and 20 mA at intervals of 4 mA. Of course, the present invention is not limited to this, and it may be a pattern consisting of 9 patterns with an interval of 2 mA, a pattern consisting of 3 patterns with an interval of 8 mA, or the like. In the present embodiment, the output current value pattern can be arbitrarily set (S101). However, the output current value pattern may be fixed.
Ｎ＝１として（Ｓ１０２）、出力電流値パターンのＮ番目の電流値の出力を２線式伝送器３１０に指示する（Ｓ１０３）。この指示は、送信部１７０から指示内容を示すデジタル信号を出力することで、ハイブリッド伝送により２線式伝送器３１０に伝えることができる。 With N = 1 (S102), the output of the Nth current value of the output current value pattern is instructed to the two-wire transmitter 310 (S103). This instruction can be transmitted to the two-wire transmitter 310 by hybrid transmission by outputting a digital signal indicating the instruction content from the transmission unit 170.
そして、電流測定部１１１が、伝送線３２０を流れる電流を測定する（Ｓ１０４）。この電流は、ハンドヘルドターミナル１００からの指示に基づいて２線式伝送器３１０が出力する電流である。 Then, the current measuring unit 111 measures the current flowing through the transmission line 320 (S104). This current is a current output from the two-wire transmitter 310 based on an instruction from the handheld terminal 100.
精度診断部１１２は、２線式伝送器３１０に指示した電流値と電流測定部１１１が測定した電流値とを対応付けてメモリ１２０に記録する（Ｓ１０５）。
処理（Ｓ１０３）以降の処理は、Ｎを増分させて（Ｓ１０７）、出力電流パターンに含まれるすべての電流値について繰り返す（Ｓ１０６）。
The accuracy diagnosis unit 112 records the current value instructed to the two-wire transmitter 310 and the current value measured by the current measurement unit 111 in the memory 120 (S105).
The processes after the process (S103) are incremented by N (S107) and repeated for all current values included in the output current pattern (S106).
そして、精度診断部１１２は、メモリ１２０に記録された電流値に基づいて、２線式伝送器３１０の出力電流値の精度判定を行なう（Ｓ１０８）。すなわち、指示した電流値と実際に出力された電流値とを比較することで、２線式伝送器３１０の出力電流値の精度判定を行なう。精度判定は、パターンに含まれるそれぞれの電流値について行なうようにする。本実施形態ではパターン終了後に一括して精度判定を行なうようにしているが、電流値測定毎に精度判定を行なってもよい。 Then, the accuracy diagnosis unit 112 determines the accuracy of the output current value of the two-wire transmitter 310 based on the current value recorded in the memory 120 (S108). That is, the accuracy of the output current value of the two-wire transmitter 310 is determined by comparing the instructed current value with the actually output current value. The accuracy determination is performed for each current value included in the pattern. In the present embodiment, the accuracy determination is performed collectively after the pattern is finished, but the accuracy determination may be performed for each current value measurement.
精度判定は、例えば、２線式伝送器３１０に指示した電流値と電流測定部１１１が測定した電流値との差分を算出し、その差分値が所定の基準値よりも大きい場合に、異常と判定することができる。差分値の指示電流値に対する割合で判定を行なってもよい。 For example, the accuracy determination is performed by calculating a difference between the current value instructed to the two-wire transmitter 310 and the current value measured by the current measuring unit 111, and when the difference value is larger than a predetermined reference value, Can be determined. The determination may be made based on the ratio of the difference value to the indicated current value.
精度判定を行なうと、判定結果を出力する（Ｓ１０９）。判定結果の出力は、例えば、指示した電流値と実際に出力された電流値とを表示部に表示することで行なうことができる。そして、異常が判定された電流値について、例えば、アラーム表示を行なうようにする。これにより、出力精度の低い電流値を容易に把握することができ、２線式伝送器３１０が出力する４−２０ｍＡ電流のゲインやゼロ点が適切であるかを診断することができる。 If accuracy determination is performed, a determination result is output (S109). The determination result can be output by, for example, displaying the instructed current value and the actually output current value on the display unit. For example, an alarm display is performed for the current value determined to be abnormal. Thereby, a current value with low output accuracy can be easily grasped, and it can be diagnosed whether the gain or zero point of the 4-20 mA current output from the two-wire transmitter 310 is appropriate.
このように、本実施形態のハンドヘルドターミナル１００では、２線式伝送器３１０と非接触で双方向通信を行なうことができる。これにより、２線式伝送器３１０との金属接触が不要となる。また、伝送線３２０を流れるループ電流を非接触で測定することができる。これにより、ループ電流測定のために別途測定装置を用いる必要がなくなる。また、ハンドヘルドターミナル１００単体で２線式伝送器３１０の出力電流精度診断を行なうことができる。このように、本実施形態のハンドヘルドターミナル１００は、従来と比して利便性が向上している。 As described above, the handheld terminal 100 according to this embodiment can perform two-way communication with the two-wire transmitter 310 in a contactless manner. This eliminates the need for metal contact with the two-wire transmitter 310. Further, the loop current flowing through the transmission line 320 can be measured in a non-contact manner. This eliminates the need to use a separate measuring device for loop current measurement. Further, the output current accuracy diagnosis of the two-wire transmitter 310 can be performed with the handheld terminal 100 alone. As described above, the handheld terminal 100 according to the present embodiment is more convenient than the related art.
なお、本発明の可搬型端末装置は、ハイブリッド伝送方式に限られず、フィールドバス方式の伝送器と通信を行なうハンドヘルドターミナルにも適用することができる。 Note that the portable terminal device of the present invention is not limited to the hybrid transmission method, and can also be applied to a handheld terminal that communicates with a fieldbus transmitter.
１００…ハンドヘルドターミナル、１１０…制御部、１１１…電流測定部、１１２…精度診断部、１２０…メモリ、１３０…入力部、１４０…表示部、１５０…Ａ／Ｄ変換部、１６０…受信部、１７０…送信部、１８０…電源部、１９０…非接触交信部、１９１…磁性体コア、１９２…ホール素子、１９３…増幅器、１９４…送信信号印加用巻線、３１０…２線式伝送器、３２０…伝送線、３３０…ディストリビュータ DESCRIPTION OF SYMBOLS 100 ... Handheld terminal 110 ... Control part 111 ... Current measuring part 112 ... Accuracy diagnostic part 120 ... Memory 130 ... Input part 140 ... Display part 150 ... A / D conversion part 160 ... Receiving part 170 DESCRIPTION OF SYMBOLS ... Transmission part, 180 ... Power supply part, 190 ... Non-contact communication part, 191 ... Magnetic body core, 192 ... Hall element, 193 ... Amplifier, 194 ... Winding for transmission signal application, 310 ... Two-wire transmitter, 320 ... Transmission line, 330 ... Distributor
Claims (4)
前記電流信号の交流成分を受信する受信部と、
前記伝送器との通信用デジタル信号を出力する送信部と、
前記送信部と接続し、前記磁性体コアに巻かれた送信信号印加用巻線と、
を備えたことを特徴とする可搬型端末装置。 A current detector that includes a magnetic core capable of clamping a transmission line connected to a transmitter, and outputs a current signal based on a current flowing through the transmission line;
A receiver for receiving an alternating current component of the current signal;
A transmitter that outputs a digital signal for communication with the transmitter;
A transmission signal application winding connected to the transmission unit and wound around the magnetic core;
A portable terminal device comprising:
前記指示と前記電流測定部の測定結果とに基づいて前記伝送器の出力電流精度診断を行なう精度診断部を備えたことを特徴とする請求項２に記載の可搬型端末装置。 As the communication digital signal, an instruction to output a current of a predetermined current value is output,
The portable terminal device according to claim 2, further comprising an accuracy diagnosis unit that performs an output current accuracy diagnosis of the transmitter based on the instruction and a measurement result of the current measurement unit.
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| WO2022249708A1 (en) * | 2021-05-24 | 2022-12-01 | 日置電機株式会社 | Signal injection device and impedance measurement device |
| WO2022249709A1 (en) * | 2021-05-24 | 2022-12-01 | 日置電機株式会社 | Impedance measurement device |
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