WO2016078916A1 - Dispositif de mesure d'une grandeur électrique - Google Patents

Dispositif de mesure d'une grandeur électrique Download PDF

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Publication number
WO2016078916A1
WO2016078916A1 PCT/EP2015/075736 EP2015075736W WO2016078916A1 WO 2016078916 A1 WO2016078916 A1 WO 2016078916A1 EP 2015075736 W EP2015075736 W EP 2015075736W WO 2016078916 A1 WO2016078916 A1 WO 2016078916A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring
energy
measuring device
terminals
display unit
Prior art date
Application number
PCT/EP2015/075736
Other languages
German (de)
English (en)
Inventor
Ingo Wolff
Timo Michel
Original Assignee
R. Stahl Schaltgeräte GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by R. Stahl Schaltgeräte GmbH filed Critical R. Stahl Schaltgeräte GmbH
Publication of WO2016078916A1 publication Critical patent/WO2016078916A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2513—Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16528—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values using digital techniques or performing arithmetic operations

Definitions

  • the invention relates to a measuring device for measuring an electrical variable, in particular a voltage or a current.
  • the measuring device can be to ⁇ turns his AC voltage, DC voltage, to measure an alternating current or direct current.
  • a switch may be provided to set the appropriate metering function for the electrical quantity.
  • the measuring device has an electrically controllable display unit. There, the measured electrical large ⁇ SSE, for example, a voltage value or a current value displayed.
  • Measuring devices of this type are known in various designs, for example, there are so-called “multimeters” for measuring current and voltage, which can have a digital display for displaying the measured electrical variable, that is to say the measured value.
  • the measuring device requires electrical energy for operation.
  • batteries are usually provided.
  • the requirement that the measuring device works without auxiliary power is common practice. This is especially important when no auxiliary power is available.
  • a field device for the au ⁇ tomatleiterstechnik includes a display unit with an RFID tag.
  • a reader can be wireless communicate with the field device, with an energy exchange is ⁇ exchange possible. If the power supply to the field device is interrupted, the reader can provide energy to the RFID chip in order to be able to transmit the data stored on the chip to the reader via the antenna.
  • the display unit of the field device may be referred to as so-called
  • a field device with a display device is also known from DE 20 2012 009 445 Ul.
  • the field device has a display unit for the visualization of measured values, settings or other parameters.
  • the display unit should be designed as electronic paper. This is a good readability with low energy requirements he ⁇ be enough.
  • the object is achieved by a measuring device with the features of claim 1.
  • the measuring device has a first measuring connection and a second measuring connection.
  • the measurement ports can each having a measuring point of an electric circuit are the verbun ⁇ to measure the measured electrical quantity, for example an electric voltage and / or an electric current between the two measuring terminals.
  • the measuring device is set up to measure an AC voltage, a DC voltage, an AC current or a DC current in different measuring modes. sen. It can be provided, for example, that the operator adjusts a suitable measuring mode depending on the variable to be measured. Alternatively, may be adapted for the measurement of a single electrical quantity which Messvorrich ⁇ processing.
  • the measuring device has a detection circuit and a supply circuit, which is respectively coupled to the two measuring terminals. This coupling can be done by a direct electrical connection or by a connec ⁇ tion via a galvanic isolation.
  • the detection circuit is adapted to generate an electrical quantity to be measured characterizing Messsig ⁇ nal and to transmit to an output circuit.
  • the output circuit has a control device and a display unit.
  • the measuring signal is preferably transmitted to the control device which generates, depending on the measurement signal a display signal and transmitted to the adosein ⁇ unit.
  • the display unit Upon receiving an indication signal aktuali ⁇ the display unit Siert the displayed information. Without receiving an indication signal, the display unit maintains the currently displayed information.
  • the display unit is implemented as electrically controllable At ⁇ display unit with an electrically controllable display field (display). It has no mechanical display ⁇ means such as pointer or the like and / or mechanical return means, such as a return spring, on.
  • the display unit displays the information currently displayed on until a new indication signal is received by the Steuerein ⁇ direction.
  • the display unit can be designed as "electrical paper” or "e-paper”. examples For example, the display unit may operate based on the principle of electrophoresis, electrowetting, micromechanical interference modulation, or using bistable LCDs.
  • the supply circuit is configured to store part of the electrical energy available between the measuring terminals in an energy store and to provide it for operation of the output circuit at supply terminals.
  • the supply circuit has no battery, which requires regular, frequent maintenance.
  • energy storage is preferably a capacitor or a rechargeable accumulator, which are maintenance-free or have very long maintenance intervals.
  • the electrical energy for the operation of the measuring device comes from ⁇ finally from the electrical energy that is available at the measuring terminals. Additional energy sources for operating the measuring device are not provided.
  • the measuring device on the measuring connections can no longer run the wide ⁇ ren operation. If, for example, the voltage between the measuring terminals drops to zero, the display unit would continue to output the last indicated voltage value, even though the voltage has actually fallen. For this reason, the supply circuit has an energy store.
  • the energy stored in the energy storage energy is large enough to at least once to the displayed information of the display unit a ⁇ ⁇ aktuali Sieren. Recognizes the supply circuit, the electrical energy that be ⁇ is riding asked about the measurement connections, for the operation of the measuring device is no longer sufficient, it can cause a corresponding display ⁇ signal and output a suitable information on the display unit.
  • the energy required for this purpose is taken from the energy storage. On the display any suitable at ⁇ particular information may, for example, "0", "off” or “off” or output.
  • the inventive design ensures that the display also in case of failure of a sufficiently large electric power to the measuring ports, at least can be updated once.
  • the detection circuit via the provided in the energy storage energy ver ⁇ care, so that an actual voltage or current value can be displayed, even if the electrical ⁇ cal energy is not sufficient at the measuring connections for the operation of the measuring device.
  • the supply ⁇ circuit generates a reset signal when the power available at the measuring terminals of electric energy for the measuring operation of the measuring apparatus is not sufficient.
  • the STEU ⁇ er worn is preferably adapted at Emp ⁇ fang of the reset signal to produce a display signal which is particularly characteristic of the presence of the reset signal and initiates a corresponding display on the display unit at ⁇ .
  • the controller and the on ⁇ display unit can be found in the electrical energy from the energy store for this.
  • both the control device, as well as the display unit via supply lines with the Supply connections connected.
  • the energy from the energy store can thus be provided directly to the control device and the display unit.
  • the detection circuit comprises an analog-to-digital converter in one embodiment.
  • the analogue-to-digital converter provides the measuring signal at its output.
  • the measuring signal is transmitted to the control device via a control line.
  • the analog-to-digital converter is not connected to the supply circuit such that it is provided energy from the energy storage.
  • the analog-to-digital converter preferably draws the electrical energy required for its operation exclusively via the measuring connections. There is no adequate electrical power for normal operation present, the analog-digital converter is turned on ⁇ for example in a quiescent state or turned off.
  • the detection circuit and / or the output circuit each have a limiting unit.
  • the limitation unit serves to limit the maximum electrical energy available in the detection circuit or the output circuit, which can be done by limiting the voltage and / or the current. This makes it possible to perform the measuring device explosion-proof, especially in the ignition ⁇ protection "intrinsic safety" (Ex-i).
  • the supply circuit may comprise a rectifier unit and / or a voltage regulator.
  • the rectifier unit ensures that the measuring device also can be connected to an AC voltage. If a DC voltage is applied to the measuring connections, the rectifier unit is not necessary.
  • it is therefore possible to bridge the rectifier unit in order to prevent electrical losses of the rectifier unit and in particular the Gleichrichterdio ⁇ .
  • in the supply circuit is a
  • the supply ⁇ circuit may be coupled via a transformer having measuring terminals. This is particularly advantageous when the measuring device is set up to measure an alternating current or is switched to a corresponding operating mode. In this case, can also provide by contract be ⁇ excessively small effective values of the alternating current suffi ⁇ accordingly energy in the energy storage.
  • the measuring device is designed and potentially explosive ⁇ protects example satisfies requirements for the "intrinsically safe” (Ex-i).
  • FIGS. 1 to 4 are each a schematic block diagram of an exemplary embodiment of a measuring device
  • Figure 5 is a flow chart for performing a method with one of the embodiments of the Messvor ⁇ direction according to the figures 1 to 4 and
  • FIG. 6 shows a schematic basic representation for switching over the measuring range or the measuring operating mode in one of the exemplary embodiments of the measuring device.
  • FIG. 1 shows a block diagram of a first exemplary embodiment of a measuring device 10.
  • the measuring device 10 is used to measure an electrical variable to be measured, for example, a DC or AC voltage U or a DC or alternating current I.
  • the measuring device 10 can before a specific application, ie for measuring a DC voltage, an AC voltage, a DC or a AC be specially adapted or switchable to different operating modes to measure several of the mentioned electrical variables in a respective operating mode can.
  • the measuring device 10 has a first measuring connection 11 and a second measuring connection 12, which are set up to be connected to a respective measuring point in an electrical circuit. Between the two measuring terminals 11, 12, a measuring resistor RM is connected.
  • the second measurement terminal 12 is, for example in accordance with a pre-connected ⁇ given reference potential P, for example ground.
  • At least the first measurement port 11 is connected to a constitutional He ⁇ circuit. 13
  • the detection circuit 13 is also connected to the reference potential P, so that via the reference potential P is a connection to the second measuring terminal 12.
  • the detection circuit 13 is adapted to generate on the basis of the measured electrical magnitude U, I, a measurement signal M, characterized that to measure the electrical magnitude U I ⁇ de.
  • the detection circuit 13 in the embodiment of an analog-to-digital converter 14, whose input is connected to the first measuring terminal 11 and at the output of the example according to digital measurement signal M is applied.
  • the measuring signal M is transmitted via a measuring line 15 to an output ⁇ circuit 16.
  • To the output circuit 16 includes a control device 17 and an electrically controllable by the controller 17 display unit 18.
  • the controller 17 To control the aspiring ⁇ ge unit 18, the controller 17 generates a display ⁇ signal A.
  • the display signal A depending on the measured ⁇ signal M, the display unit 18th control, so that there information is output, which describes the electrical variable U, I to be measured, for example, a voltage ⁇ reading or a current reading.
  • the display unit 18th control so that there information is output, which describes the electrical variable U, I to be measured, for example, a voltage ⁇ reading or a current reading.
  • numerical values which be ⁇ write the measured electrical quantity, and qualitative information or the like in the form of text, symbols or the like can be output.
  • the display signal A is transmitted for this purpose to an Ad ⁇ ge Kunststoffung 19 of the display unit 18, which controls the pixels and / or lines and / or columns of the display panel of the display unit 18 to display the desired Informa ⁇ functions.
  • an acoustic output device could also be present, for example in order to output signal tones or the like in the case of specific states or measured values.
  • the display unit 18 and the display panel is preferably carried out before ⁇ as a so-called electronic paper, or "e-paper".
  • e-paper electronic paper
  • it may be an electrophoretic display.
  • At least one input / output interface 20 may be present at the output unit 16.
  • the input / output interface 20 can be arranged on the control device 17 and / or on the display unit 18.
  • the trade fair Device 10 also has a supply circuit 25.
  • the supply circuit 25 provides a supply voltage V for the output circuit 16 to supply terminals 26, 27.
  • To the first supply port 26 is a first supply line 28 and to the second supply port 27, a second supply line 29 is closed ⁇ .
  • the two supply lines 28, 29 are connected both to the control device 17 and to the display unit 18 in order to provide the electrical energy for operation.
  • To the supply circuit 25 in the embodiment includes a rectifier unit 33 which is connected to the two measuring terminals 11, 12 and provides at its output a rectified voltage UG.
  • the supply circuit 25 also has a rechargeable energy store 34, for example a capacitor or an accumulator. To charge the energy storage 34, the rectified voltage UG is used.
  • the rectified voltage UG or the energy provided by the voltage ⁇ memory 34 is inserted ⁇ between two input terminals 35, 36 of a voltage regulator 37th
  • the voltage regulator 37 provides the output side Ver ⁇ supply voltage V prepared and thus, the output terminals 26, 27.
  • the electrical energy required for the operation of the measuring device 10 is obtained exclusively by the electrical energy that is available between the measuring terminals 11, 12. A portion of this available energy is used by the supply circuit 25 to charge the energy store 34.
  • the electric power shut kitge ⁇ in the energy storage 34 can be used to determine the Output circuit 16 to operate at least for a predetermined period of time, so that the information displayed on the output unit 18 at least once and preferably can be updated exactly once.
  • the measuring device 10 according to FIG. 1 operates as explained below with reference to FIG. 5:
  • step Sl when the Messan ⁇ circuits 11, 12 are connected to an electrical circuit - then flows between the two measuring terminals 11, 12 through the measuring resistor RM, a current I and the measuring resistor RM is a voltage U at.
  • a two ⁇ th step S2 it is checked whether the available at the measuring terminals 11, 12 electrical energy for the operation of the measuring device 10 is sufficient. If this is the case (branch J from the second step S2), the electrical energy available at the measuring terminals 11, 12 is used for the operation of the measuring device 10.
  • the supply circuit 25 provides a supply voltage V for the output circuit 16 by means of the electrical power available between the measuring terminals 11, 12 and additionally charges the energy store 34.
  • the analog-to-digital converter 14 generates the measuring signal M and transmits depending on the electrical variable to be measured this to the control device 17 (third step S3).
  • the control device 17 generates, depending on the measurement signal M is a display signal A (the fourth step S4), based on which the display unit 18 outputs information, wherein ⁇ game as the amount of the current I or the voltage U (the fifth step S5).
  • the steps S2 to S5 are repeated cyclically ⁇ or alternatively can also by an Er- event that requests the reading and display of an updated measurement.
  • the display unit 18 is designed so that it retains the displayed information until a further display signal A is received by the control device 17. As long as no to show ⁇ signal A is received remains to obtain the information currently displayed.
  • the voltage regulator 37 generates a reset signal R when the electrical energy available at the measuring terminals 11, 12 is no longer sufficient for the operation of the measuring device 10 (sixth step S6).
  • the reset signal R is transmitted to the control device 17.
  • the control device 17 upon receiving the reset signal R a entspre ⁇ and fair indication signal A and the displayed information of the display unit 18 is updated (seventh step S7).
  • the display "0" or “off” or ⁇ same can output.
  • the energy store 34 is dimensioned such that sufficient electrical energy is available for the output circuit 16 or the voltage regulator 37 in order to at least once again update the display. increase. Then the process ends in the eighth step S8.
  • the measuring device 10 does not have any auxiliary power sources, but is ultimately only operated by the electrical energy provided between the measuring terminals 11, 12, from which the energy store 34 is also charged.
  • each have a limiting ⁇ unit 41 is arranged in the detection circuit 13 as well as in the power supply circuit 25 schematically.
  • the limiting unit 41 is used, the available electric power to begren ⁇ zen. For example, this can be realized a voltage and / or current limiting.
  • the measuring device 10 is carried out explosion-proof example. By using one or more delimiting units 41, it can be achieved that the measuring device 10 fulfills the type of protection "intrinsic safety" (Ex-i).
  • FIG. 2 shows another embodiment of the measuring device 10.
  • the rectifier unit 33 is formed by a diode circuit, in particular a two-way rectification with four rectifier diodes in a known manner.
  • the energy store 34 is formed by a capacitor C. It is understood that a series and / or parallel connection of several capacitors to achieve the desired capacity can be provided.
  • a limiting unit 41 is le ⁇ diglich provided in the supply circuit 25th
  • the limiting unit 41 is at ⁇ game according to the voltage limitation of the rectified voltage UG or the explicatgestell- from the energy storage 34 th voltage and connected to the input terminals 35, 36 of the voltage regulator 37.
  • This is connected in at least a Zener diode 42 in accordance with ⁇ play between the two input terminals 35, 36th
  • the voltage Zvi ⁇ rule to the input terminals 35, 36 is therefore limited to the Zener voltage of the Zener diodes 42nd
  • at least two Zener diodes 42 are connected in parallel to each other ⁇ .
  • the exemplary embodiment according to FIG. 2 corresponds to the exemplary embodiment according to FIG. 1, so that reference may be made to the above description.
  • the structure of the measuring device 10 according to FIGS. 1 and 2 is particularly suitable for measuring a DC voltage or AC voltage U.
  • FIG. 3 shows an alternative possible embodiment of the measuring apparatus 10 is illustrated which is suitable in the particular ⁇ for measuring a DC or AC current I.
  • the measuring resistor RM should be as large as possible in terms of magnitude of the voltage measurement (megohm range)
  • the magnitude of the measuring resistor RM during the current measurement is very small (in the range of at most a few ohms).
  • the supply circuit 25 may be connected to the measuring terminals 11, 12 via a transformer 43.
  • FIG. 4 shows a further exemplary embodiment of the measuring device 10, in which a galvanic isolation between the measuring resistor RM and the supply circuit 25 as well as the detection circuit 13 is present.
  • the heat radiation of the current-carrying measuring resistor RM for supplying electrical energy to the supply circuit 25 is used via a thermogenerator 44.
  • the measurement signal M is generated by the detection circuit 13 via the applied voltage at the output of the thermogenerator 44, which is cha ⁇ characteristic of the current flowing through the measuring resistor RM current.
  • This circuit is suitable, for example, for current measurement.
  • a switching unit 45 by means of the different measurement regions or different ⁇ Liche measurement modes of the measurement device 10 are adjustable.
  • various measuring resistors RM1, RM2, ... RMn may be arranged parallel to each other, wherein each ⁇ wells a selected measuring resistor RM1, RM2, ... RMn is switched between the two measuring terminals 11, 12, depending on whether a voltage or a current is to be measured or how large the voltage or current values to be measured are.
  • the switching unit 45 may also be of the transformer 43 for coupling the power supply circuit 25 with the measuring terminals 11, 12 interposed or bridged in other operating modes are play, in ⁇ .
  • the invention relates to a measuring device 10 for measuring an electrical variable, for example a DC or AC voltage U and / or a DC or alternating current I.
  • the measuring device 10 is preferably designed explosion-proof and can the ignition protection "intrinsic safety" (Ex-i) correspond.
  • the measuring device 10 has a detection circuit 13 in order to generate a measurement signal M, which characterizes the electrical variable U, I to be measured,
  • the measurement signal M is transmitted to a control device 17 of an output circuit 16, which transmits an indication signal A to a display unit 18 produced.
  • the on ⁇ display unit 18 a supply scarf ⁇ tung 25 updated upon receipt of a adossig ⁇ Nals a the information displayed on a display panel.
  • a display signal a is received, is maintained the refreshes ⁇ ell displayed information. with an energy storage 34, and preferably a Voltage regulator 37 provides a supply voltage g V ready for the output circuit 16.
  • the stored energy in the energy storage 34 is sufficient to update the displayed Informa ⁇ tion of the display unit 18 once.
  • the energy stored in the energy store 34 as well as the energy used for the operation of the measuring device 10 comes exclusively from the electrical energy that is provided via the measuring terminals 11, 12.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

L'invention concerne un dispositif de mesure (10) destiné à mesurer une grandeur électrique, telle qu'une tension continue ou alternative (U) et/ou un courant continu ou alternatif (I). Le dispositif de mesure (10) est de préférence à l'épreuve des explosions et peut correspondre au type de protection « sécurité intrinsèque » (Ex-i). Le dispositif de mesure (10) comprend un circuit de détection (13) pour générer un signal de mesure (M) qui caractérise la grandeur électrique mesurée (U, I). Le signal de mesure (M) est transmis à un dispositif de commande (17) d'un circuit de sortie (16) qui génère un signal d'affichage (A) destiné à une unité d'affichage (18). L'unité d'affichage (18) actualise, lors de la réception d'un signal d'affichage (A), l'information affichée sur un panneau d'affichage. Si aucun signal d'affichage (A) n'est reçu, l'information affichée est conservée. Un circuit d'alimentation (25) pourvu d'un accumulateur d'énergie (34) et de préférence d'un régulateur de tension (37) produit une tension d'alimentation (V) destinée au circuit de sortie (16). L'énergie stockée dans l'accumulateur d'énergie (34) est suffisante pour réactualiser l'information affichée de l'unité d'affichage (18). L'énergie stockée dans l'accumulateur d'énergie(34) ainsi que l'énergie utilisée pour faire fonctionner le dispositif de mesure (10) provient uniquement de l'énergie électrique qui est produite par les bornes de mesure (11, 12).
PCT/EP2015/075736 2014-11-17 2015-11-04 Dispositif de mesure d'une grandeur électrique WO2016078916A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014116736.8 2014-11-17
DE102014116736.8A DE102014116736A1 (de) 2014-11-17 2014-11-17 Messvorrichtung zur Messung einer elektrischen Größe

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WO2016078916A1 true WO2016078916A1 (fr) 2016-05-26

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017215135A1 (de) * 2017-08-30 2019-02-28 Siemens Mobility GmbH Verfahren sowie Vorrichtung zur Überprüfung einer Kontaktierung eines Stromabnehmers

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GB2256101A (en) * 1991-05-23 1992-11-25 Robert David Jackson Power supply alarm with indication of failure duration
US6470283B1 (en) * 1999-11-15 2002-10-22 Thomas G. Edel Non-contact self-powered electric power monitor
US20090212964A1 (en) * 2008-02-21 2009-08-27 Rodney Hibma Electrical Test Apparatus
US20120215470A1 (en) * 2011-02-22 2012-08-23 Yael Maguire Ac plug receptacle with non-contact power meter and radio telemetry
DE202012009445U1 (de) 2012-10-01 2012-10-10 Abb Technology Ag Feldgerät mit Anzeigevorrichtung
DE102011081517A1 (de) 2011-08-24 2013-02-28 Endress + Hauser Gmbh + Co. Kg Feldgerät für die Automatisierungstechnik
US20130076520A1 (en) * 2011-09-23 2013-03-28 John A. Kovacich System including an indicator responsive to an electret for a power bus

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DE3027398C2 (de) * 1980-07-19 1985-01-03 Dipl.Ing. Ulrich Knick Elektronische Meßgeräte GmbH & Co, 1000 Berlin Elektrische Anzeigevorrichtung
DE9318101U1 (de) * 1993-11-16 1994-01-20 Conrad Electronic Gmbh Vielfach-Meßgerät zur Messung elektrischer Größen
US6294284B1 (en) * 1999-04-16 2001-09-25 The Gillette Company Gauge effect battery tester
DE19924237A1 (de) * 1999-05-27 2000-11-30 Berthold Kusserow Einrichtung zur Überwachung des Stroms eines elektrischen Leiters
DE19938117A1 (de) * 1999-08-12 2001-03-15 Reinisch Gmbh & Co Kg Spannungsmeßvorrichtung
DE102011003308B4 (de) * 2011-01-28 2014-06-05 Micropelt Gmbh Überwachungsanordnung und Verfahren zur Überwachung einer elektrischen Leitung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2256101A (en) * 1991-05-23 1992-11-25 Robert David Jackson Power supply alarm with indication of failure duration
US6470283B1 (en) * 1999-11-15 2002-10-22 Thomas G. Edel Non-contact self-powered electric power monitor
US20090212964A1 (en) * 2008-02-21 2009-08-27 Rodney Hibma Electrical Test Apparatus
US20120215470A1 (en) * 2011-02-22 2012-08-23 Yael Maguire Ac plug receptacle with non-contact power meter and radio telemetry
DE102011081517A1 (de) 2011-08-24 2013-02-28 Endress + Hauser Gmbh + Co. Kg Feldgerät für die Automatisierungstechnik
US20130076520A1 (en) * 2011-09-23 2013-03-28 John A. Kovacich System including an indicator responsive to an electret for a power bus
DE202012009445U1 (de) 2012-10-01 2012-10-10 Abb Technology Ag Feldgerät mit Anzeigevorrichtung

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