Abstract: The present invention relates to an apparatus and a method capable of calculating insulation resistances and parasitic capacitances of a battery outside the battery. In the present invention, when a positive electrode connector and a negative electrode connector are coupled to a positive electrode terminal and a negative electrode terminal of the battery, respectively, and a ground connector is coupled to a case of the battery, even though the battery is positioned inside a chamber in order to perform a temperature test or the like of the battery, the insulation resistances and the parasitic capacitances of the battery may be calculated without needing to move the battery to the outside of the chamber. Accordingly, the insulation resistances and the parasitic capacitances of the battery may be conveniently calculated.

Abstract: A system for monitoring a circuit breaker includes: at least one sensor and a processor. The at least one sensor is configured to be located and utilized to obtain at least one sensor data of a main shaft of an operational circuit breaker, and the at least one sensor is configured to provide the at least one sensor data of the main shaft of the operational circuit breaker to the processor. The processor is configured to determine position and/or velocity information for a moveable contact of the operational circuit breaker, where the determination comprises analysis of the at least one sensor data of the main shaft of the operational circuit breaker by a trained neural network implemented by the processor.

Abstract: A method for localizing a short circuit between a conductor and an electrically conductive shield of a high-voltage cable comprises providing at least two measuring apparatuses arranged at the high-voltage cable at a known distance from one another and having timers, synchronized with one another, and a measuring device for detecting an electric current flowing in the shield and/or an earthing line connecting the shield and earth. The measuring apparatus transmits pairs of current measurement values and associated values of the timer to an analysis unit, which, upon the occurrence of a current exceeding a threshold value and/or of a current profile over time that satisfies specific stipulations, feeds to a calculation unit the associated values of the timers and also an indication about the location of the measurement, for which first effects of the short circuit occurred.

Abstract: A method of compensating electromagnetic emissions of a device for use in a communication bus, the method including: transmitting a test signal over the communication bus; receiving, at the device, the test signal after propagation over the communication bus; performing frequency analysis processing of the test signal received to detect a set of harmonic components of the test signal received having an amplitude exceeding a certain threshold; storing respective values of frequency of harmonic components in the set of harmonic components having an amplitude exceeding the certain threshold; and generating and transmitting over the communication bus a set of compensation signals, each compensation signal in the set of compensation signals being a sinusoidal signal having a respective frequency equal to one of the frequencies stored, and being in anti-phase with respect to the harmonic component of the test signal received having the respective frequency.

Abstract: An interlock circuit comprises a plurality of semiconductor switching units electrically connected or connectable in series in a supply line, a plurality of control units electrically connected to the plurality of semiconductor switching units, and a trigger unit electrically connected to the plurality of control circuits. Each control unit activates or deactivates a corresponding semiconductor switching unit in response to trigger signal received from the trigger unit.

Abstract: A LED driving apparatus with differential signal interfaces is introduced, including: N-stages LED drivers, wherein the first stage LED driver receives a first data packet differential signal and a first clock differential signal and outputs a second data packet differential signal and a second clock differential signal, the Mth stage LED driver receives a Mth data packet differential signal and a Mth clock differential signal and outputs a (M+1)th data packet differential signal and a (M+1)th clock differential signal.

Abstract: One preferable aspect of the present invention is a state detecting system which detects a state of a machine device based on a detection signal from a detecting element provided to the machine device, and is the state detecting system which includes a non-normal time rate detecting unit which detects a rate or a value as a non-normal time rate, the rate being a rate of an integration value of a time during which an amplitude of the detection signal exceeds a predetermined normal amplitude within a predetermined time, and the value being physically equivalent to the rate.

Abstract: A system for an aircraft includes an aircraft component that includes a heater routed through the aircraft component, the heater including a resistive heating element and insulation surrounding the resistive heating element. A first current flows into the resistive heating element to provide heating for the aircraft component and a second current flows out of the resistive heating element. The system further includes a first sensor configured to produce a first sensor signal representing the first current, a second sensor configured to produce a second sensor signal representing the second current, a leakage sensor configured to produce a leakage sensor signal representing a leakage current, and a signal processor configured to sample and measure the first current, the second current, and a leakage current using a high frequency sampling rate to identify the presence of electric arcing. The detection of electric arcing is used to predict future heater failure and estimate heater remaining useful life.

Abstract: A device [200] is configured to detect a zero voltage switching (ZVS) circuit [110] output that includes a hard switching signal. The hard switching signal [114] includes a false signal [116] and a spike signal [118]. Thereafter, the device generates digital pulse signals [312/314] that correspond to the false signal and the spike signal. Accordingly, the device filters the generated digital pulse signal that corresponds to the false signal [312], and uses the digital pulse signal [314] that corresponds to the spike signal for adjusting a timing [132] of a pulse width modulation (PWM) switching cycle [Vgs ].

Abstract: A modular digital optical gunsight (MDOG) peripheral module validation device includes an MDOG data connector configured to connect to an MDOG peripheral module and to receive and/or transmit MDOG data in a first format to or from the MDOG peripheral module, a translation module configured to translate the MDOG data in the first format to a second format that is compatible with a personal computer (PC), and a PC data connector configured to connect the validation device to a PC and to receive and/or transmit the MDOG data in the second format to the PC. The translation module can be configured to translate data in the second format to the first format.

Abstract: A method for detecting an operational condition of a multi-conductor cable is described, and which includes generating a first, single ended, time domain reflectometer signal which is introduced into a multi-conductor cable; processing the first, single ended, time domain reflectometer signal so as to generate a first, differential time domain reflectometer signal; supplying the first, differential time domain reflectometer signal to the multi-conductor cable; converting a reflected, differential time domain reflectometer signal into a second, single ended, time domain reflectometer signal; numerically and/or graphically analyzing the second, single ended, time domain reflectometer signal; and identifying, by the numerical and/or graphical analysis, an operational condition of the multi-conductor cable undergoing the testing.

Abstract: Illustrative embodiments disclosed herein pertain to a capacitive coupler that is custom fabricated to provide shape conformability with a component under test. The shape conformability allows the capacitive coupler to provide a high level of capacitive coupling between an electrode in the capacitive coupler and a metal part contained in the component. The electrode in the capacitive coupler has one or more characteristics such as a shape and an orientation, that are defined by utilizing the metal part as a template during fabrication of the capacitive coupler. In one exemplary embodiment, the electrode in the capacitive coupler has a form factor that substantially matches a form factor of the metal part contained in the component. In another exemplary embodiment, the metal part is oriented at a non-orthogonal angle with respect to a major surface of a printed circuit board upon which the component is mounted.

Abstract: Function extender devices for enhancing feature sets for display arrangements having source devices and sink devices are disclosed. In one embodiment, a non-addressable device is disclosed for use in a system having a source and a sink to communicate with each other via a bus, where the non-addressable device comprises a functional logic block for coupling between the source and the sink and operable to perform at least one function on data of one or both of the first channel for video and audio data or data of a sideband channel received from the source, where the data of the first channel for video and audio data and data of a sideband channel are received from the source being addressed to the sink. The device also comprises a Physical (PHY) repeater operable to transmit data of both the first channel and the sideband channel after performance of the at least one function by the functional logic block on the data of one or both of the first channel or the sideband channel received from the source.

Abstract: A partial discharge detection apparatus detects a plurality of discharge events, finds a time interval between the plurality of discharge events, and determines, where the discharge events occur at a time interval shorter than a threshold time, that a partial discharge has occurred within a metal enclosure, or determines, where the discharge events occur only at a time interval longer than the threshold time, that a discharge has occurred outside the metal enclosure. The partial discharge detection apparatus can thus readily distinguish between a partial discharge that occurs within the metal enclosure of a gas-insulated switchgear and a discharge that occurs outside the metal enclosure.

Abstract: Traveling wave information from a single end of an electric power delivery system is used to determine a fault location on a power line of the electric power delivery system. Hypotheses of which of a plurality of received traveling waves represents a first reflection from the fault are evaluated. A determination of an arrival time of the first reflection from the fault is used to calculate a distance from the single end of the power line to the fault location.

Abstract: The invention pertains to in-wafer testing of integrated circuits. In particular, it pertains to apparatuses and methods for testing small integrated circuits that have pad sizes and pitches that are too small for using conventional wafer probing technology.

Abstract: Traveling wave information from a single end of an electric power delivery system is used to determine a fault location on a power line of the electric power delivery system. Hypotheses of which of a plurality of received traveling waves represents a first reflection from the fault are evaluated. A determination of an arrival time of the first reflection from the fault is used to calculate a distance from the single end of the power line to the fault location.

Abstract: In an insulation inspection apparatus configured to perform insulation inspection of a wiring pattern, when a voltage for performing the insulation inspection is applied between inspection objects, a current control unit controls a first current to be greater than a second current, the first current being supplied until the potential difference between the first inspection part and the second inspection part reaches the predetermine potential difference, the second current being supplied when the predetermined potential difference is reached.

Abstract: A dual-sensor signal collecting circuit comprises circuit (11), a second sensor signal collecting circuits, an AD sampling circuit, an AND gate determination circuit and a collected signal averaging circuit. Output ends of the sensor signal collecting circuits are connected to respective input ends of the AND gate determination circuit, respective input ends of the collected signal averaging circuit and a first AD sampling port of the AD sampling circuit; an output end of the AND gate determination circuit is connected to a power supply end of the collected signal averaging circuit; an output end of the collected signal averaging circuit is connected to the first AD sampling port of the AD sampling circuit. When the sensors operate normally, the collected signal averaging circuit outputs an average sampling value to the first AD sampling port, when one is damaged, a sampling value of the one operating normally is output to the first AD sampling port.

Abstract: A current sensor includes a first resistor between a first node and a second node, a first voltage limiting device between the first node and the second node, and a second resistor between the second node and a third node, wherein a resistance level of the first resistor is greater than a resistance level of the second resistor, and wherein a current flowing from the third node to the first node is configured to be measured based on a voltage across the first resistor or a voltage across the second resistor.

Abstract: A signal testing apparatus for a printed circuit board is disclosed which includes a plurality of input terminals for receiving an external testing signal, a plurality of output terminals for supplying the printed circuit board with the external testing signal, a plurality of switches arranged between the plurality of input terminals and the plurality of output terminals for controllably coupling the plurality of input terminals to the plurality of output terminals, an ammeter for measuring a magnitude of a current on a first path provided by the coupling of the plurality of switches, and a voltmeter for measuring a magnitude of a voltage on a second path provided by the coupling of the plurality of switches.

Abstract: In various embodiments, one or more signals indicative of a shape formed by a flexible lighting strip (100) may be obtained, e.g., from one or more sensors (110) secured to the flexible lighting strip. One or more deformations in the flexible lighting strip may be detected based on the one or more signals. One or more light sources (102) may be selectively energized based on the one or more detected deformations. In some embodiments, one or more light sources contained in a first logical partition of the flexible lighting strip bound by at least one deformation may be energized to emit light having a first property. One or more light sources contained in a second logical partition of the flexible lighting strip separated from the first logical partition by at least one deformation may be energized to emit light having a second property different than the first property.

Abstract: Methods and Systems for detecting anomalies in a control area of a control system. Estimating for the control area, a first state from a historical state over a first time period using a model of dynamics, and defining a transition of the first state as a function of control inputs, the first state includes a generator state for each generator, the control inputs include a network state for each bus, a mechanical input to each generator or power consumptions at the buses. Updating estimated first state, by connecting measurements of rotor frequency of each generator and measurements of the network states on the buses with the generator state of each generator, to obtain a second state over a second time period later than the first time period, and detecting anomalies based on a statistic deviation of the second state from its corresponding prediction derived from the first state.

Abstract: The disclosure herein relates to a partial discharge detection board comprising a high voltage resistor divider. The high voltage resistor divider can reduce a voltage peak of an impulse surge generated by a surge board. The high voltage resistor divider can also include a high side with a first resistance and a low side with a second resistance.

Abstract: A circuit board inspecting apparatus is disclosed for inspecting a circuit board having wiring patterns separated from each other and forming a plurality of wiring pattern pairs. The apparatus includes a low-voltage inspection part to apply a first low-potential difference below a threshold voltage between wiring patterns in a first of the plurality of wiring pattern pairs, and to detect a first current flowing therebetween. A resistance measurement part is provided to measure a first resistance value between the wiring patterns of the first wiring pattern pair upon detection of the first current and a high-voltage inspection part is configured to selectively apply, based on the first resistance value, a high-potential difference above said threshold voltage, between the wiring patterns in a second of said plurality of wiring pattern pairs.

Abstract: A device includes a matrix of active pixels, with each active pixel having an OLED diode having a cathode to receive a cathode voltage, and a control circuit coupled to an anode of the OLED diode. The device also includes at least one dummy pixel having a dummy OLED diode having a cathode to receive the cathode voltage, and an anode, and a dummy control circuit coupled to the anode of the OLED diode and having a power supply terminal. The dummy OLED diode and the dummy control circuit are substantially similar to the OLED diode and the control circuit. First regulation circuitry is configured to deliver a reference current to the power supply terminal to thereby generate a voltage, and second regulation circuitry is configured to regulate the cathode voltage so as to maintain the voltage at the power supply terminal at a given level.

Abstract: The present disclosure discloses a method and system of determining a location of a line fault of a panel. The method comprises: connecting a front end point of a metal wire that is determined to have suffered the line fault to a probe of a test instrument, the other probe of the test instrument being connected to a common electrode wire; performing a fusing-off processing on the metal wire according to a preset rule; and determining the location of the line fault of the metal wire based on a variation in the readings from the test instrument upon the fusing-off of the metal wire. The system comprises: a test instrument, one probe of which being connected to a front end point of a metal wire that is determined to have suffered the line fault, the other probe of which being connected to a common electrode wire; and a laser for performing a fusing-off processing on the metal wire.

Abstract: A circuit board testing system includes a testing fixture and a computer system. The testing fixture includes a contact element, a switching circuit, a connection module, and a data acquisition unit. The contact element is connected with a circuit board. The switching circuit is connected with the contact element. The connection module is connected with the circuit board and the computer system. Consequently, an electric power is transmitted from the computer system to the circuit board through the connection module. By enabling the connection module, the data acquisition unit acquires a real voltage value corresponding to the electronic component. The computer system is connected with the testing fixture. According to the real resistance value, the computer system judges whether the electronic component passes the test.

Abstract: An electrically heated aerosol generating system for receiving an aerosol-forming substrate includes at least one heating element for heating the substrate to form the aerosol and a power supply for supplying power to the at least one heating element. The power supply includes a voltage source, two or more supercapacitors, and switches between the voltage source and the two or more supercapacitors. The switches are arranged so that, during a charging mode, the supercapacitors are connected so as to be charged by the voltage source and, during a heating mode, the supercapacitors are connected so as to discharge through the at least one heating element.

Abstract: The present invention provides a method to ensure that distributed resources of a power distribution system remain connected to the circuitry of the power distribution system when a fault occurs at a distributed resource node to assist in identifying the location of the fault by continuing to inject current from the distributed resources into the distribution system, wherein at least one of the distributed resources is a solar panel.

Abstract: The present invention provides a method to ensure that distributed resources of a power distribution system remain connected to the circuitry of the power distribution system when a fault occurs at a distributed resource node to assist in identifying the location of the fault by continuing to inject current from the distributed resources into the distribution system, wherein at least one of the distributed resources is a wind turbine.

Abstract: The present invention provides a method to ensure that distributed resources of a power distribution system remain connected to the circuitry of the power distribution system when a fault occurs at a distributed resource node to assist in identifying the location of the fault by continuing to inject current from the distributed resources into the distribution system, wherein at least one of the distributed resources is a microturbine.

Abstract: A method of detecting and locating a micro-interface abnormality within an electrical system having a plurality of conductors and a plurality of electrical connections includes identifying a subset of the plurality of electrical connections by detecting an acoustic signal within the electrical system and analyzing the detected acoustic signal and determining that the detected acoustic signal is indicative of an electrical fault, measuring a contact resistance of each of the subset of the plurality of electrical connections, and identifying at least one of the subset of the plurality of electrical connection points as having a micro-interface abnormality based on the measured contact resistances.

Abstract: An antenna system is disclosed herein which includes a frontend portion, a backend portion and a feed line which connects frontend portion and backend portion with each other. The frontend portion comprises at least two antennas, a combiner connected downstream of the antennas and upstream of the feed line and antenna connectors that electrically connect through antenna plugs, the antennas to the combiner. The backend portion includes an electrical power source connected to the feed line and a resistance evaluation circuit connected between the electrical power source and the feed line and that measures the resistance of the frontend portion through the feed line. At least one of the antenna connectors is in mechanical contact with a jumper having jumper plugs between which a high resistance connection and a low resistance connection is provided that depends on whether the corresponding antenna is connected to the combiner or not.

Abstract: The invention relates to a method and a device for monitoring the insulation of an ungrounded DC and/or AC voltage network. The method includes the following steps: (a) generating a measurement DC voltage Umess= that is connected to a ground on one side for a tvar; predeterminable measuring time frame tvar; (b) generating and superposing at least one measurement AC voltage Umess˜ connected to a ground and having a measurement duration tcons with the measurement DC voltage Umess? for forming a total measurement voltage Umess; (c) feeding the total measurement voltage Umess into the voltage network to be monitored; and (d) determining an insulating resistance R= from the measurement DC voltage Umess? and an insulating impedance Z from the measurement AC voltage Umess˜. The devise is configured to carry out the above method. The method and the device are suited in particular for monitoring the insulation in electric and hybrid vehicles.

Abstract: An integrated circuit structure can include a plurality of solder bumps coupled in series forming a chain and a plurality of diodes, wherein each diode is coupled to one of the plurality of solder bumps. The integrated circuit structure also can include a first pad coupled to the solder bump of the plurality of solder bumps at an end of the chain. The first pad can be configured to provide a test current responsive to application of a forward bias voltage to each diode of the plurality of diodes.

Abstract: An electrical safety monitor for monitoring electrical energy potentials of one or more electrical power input lines of an A.C. circuit. The electrical safety monitor including one or more detector circuits, each including one or more capacitors corresponding to one or more electrical power input lines arranged to charge responsive to an electrical energy potential on the corresponding line and a discharge circuit electrically communicating with the one or more capacitors to cause a capacitor discharge at a predetermined capacitor voltage. A plurality of solid-state light-emitting devices disposed in a human-viewable arrangement, each light emitting device electrically communicating with a selected capacitor and producing a light output responsive to capacitor discharge of the corresponding capacitor. A testing circuit generates a test current through the one or more detectors circuits providing verification of the electrical safety monitor integrity.

Abstract: The present invention relates to a fault detection system for detection of line faults on an electrode line in an HVDC system wherein the electrode line comprises a first and second branch connected in parallel. The fault detection system comprises a first and second pulse generation circuit arranged to generate electrical pulses onto the first and second branches, respectively, as well as first and second current measurement devices arranged to generate signals indicative of electrical signals occurring in first and second injection lines, respectively. The possibility of independent generation of electrical pulses onto the first and second branches, respectively, as well as the independent registration of first and second signal patterns representing electrical signals on the first and second injection lines, respectively, increases the information content in the collected data, thereby facilitating for a more reliable analysis of whether or not a fault is present on the electrode line.

Abstract: According to an example implementation, a universal tester includes a host interface slot connected to a first pluggable host card during an electrical test mode of operation to provide a stressed electrical signal to a host under test. The host interface slot is connected to a second pluggable host card during an optical test mode of operation, the second pluggable host card including an electrical-optical conversion block to convert a stressed electrical signal to a stressed optical signal that is provided to a host under test. A stressor generator may operation in pass-through mode or a loop-back mode.

Abstract: A secondary battery capable of ensuring operator safety by checking whether a service plug is opened or closed. The secondary battery includes a battery pack having a plurality of battery cells, a service plug coupled between each of the plurality of battery cells through a pair of plug terminals for controlling interconnection of the plurality of battery cells according to whether the pair of plug terminals contact the battery cells, and a battery management system connected to the battery pack and the service plug for determining whether the service plug is opened or closed by measuring at least one selected from the group consisting of a voltage and a current of the battery pack and voltages of the plurality of battery cells connected to the service plug.

Abstract: A digital sensing device includes a sensor diagnostic system for detecting sensor fault conditions. The sensor diagnostic system including an input multiplexer applying a first burnout current or a second burnout current to a selected input channel and a near-rail detector configured to detect when an input voltage of the digital sensing device is near a positive power supply or near a negative power supply. The burnout current injection is applied without interfering with the sensor data. In other embodiments, the sensor diagnostic system may further include an overload detector configured to detect an overflow or underflow condition at the analog-to-digital converter. The sensor diagnostic system may further include a window comparator to detect when the ADC digital output is near a zero digital value. Finally, the sensor diagnostic system may further include a sensor flag generator to generate data flags indicative of sensor fault conditions.

Abstract: Embodiments of methods and apparatuses for characterizing an electrical power distribution system are disclosed. One method includes applying a plurality of test signals to a first plurality of test points of the electrical power distribution system, measuring a plurality of response signals at a second plurality of test points of the electrical distribution system, deriving a characterization matrix for the electrical power distribution system from the plurality of test signals and response signals, and characterizing the electrical power distribution system based on the derived characterization matrix.

Abstract: Systems for reliability testing include a picometer configured to measure a leakage current across a device under test (DUT); a camera configured to measure optical emissions from the DUT based on a timing of the measurement of the leakage current; and a test system configured to apply a stress voltage to the DUT and to correlate the leakage current with the optical emissions using a processor to determine a time and location of a defect occurrence within the DUT by locating instances of increased noise in the leakage current that correspond in time with instances of increased optical emissions.

Abstract: A circuit for detecting fault conditions in a supply circuit includes a monitoring circuit and a comparator circuit. The monitoring circuit is operable to output a detection signal related to a control signal for the switched mode power supply. The control signal may be configured to operate at least one switch of the supply circuit between alternating activated and deactivated states to supply power to a load. The comparator circuit is operable to compare the detection signal to a range defined by first and second thresholds and output a fault signal according to a relationship of the detection signal to the range over a time period. Related methods of operation are also discussed.

Abstract: Aspects of the present disclosure provide for a cable tester that tests a cable to determine the cable length. The cable tester can include a clock generator that generates a clock that has clock period that is a multiple of the data symbol period and a signal generator that injects the training signal, which can be synchronous with the clock, into the cable. The cable tester can also include a receiver that samples the returned signal from the cable and adaptively filters the returned signal based on the training signal and a controller that determines the cable length from the adaptive filter tap coefficients.

Abstract: A high-voltage discharge circuit diagnostic system includes a high voltage DC link with a positive DC link and a negative DC link, a first resistor selectably connectable between the positive DC link and the negative DC link, and a second resistor connected between the positive DC link and the negative DC link. A control module connects the first resistor between the positive DC link and the negative DC link until the high voltage DC link discharges to a first voltage after which the control module disconnects the first resistor from between the positive DC link and the negative DC link to permit continued discharge of the high voltage DC link through the second resistor to a second voltage through an elapsed time period. The control module diagnoses a fault in the second resistor based upon the first voltage, the second voltage, and the elapsed time period.

Abstract: A display apparatus and a method for detecting a voltage error thereof, include a display unit which displays an image, a voltage supply which supplies a voltage to respective elements of the display apparatus, a detector which monitors a plurality of voltages supplied to the respective elements of the display apparatus and detects an error occurring from at least one of the plurality of voltages, and a controller which determines a location where an error has occurred if the error has occurred from at least one of the plurality of voltages according to a detection result of the detector. Thus, the display apparatus and method thereof determine whether a voltage error is present and determine the location of one or more errors without difficulty using a circuit for performing the self diagnosis.

Abstract: Methods and apparatus for power measurement in a communication system. In an aspect, a method is provided for power measurement. The method includes selecting between a signal decoding mode and a power measurement mode, decoding an input signal if the signal decoding mode is selected, and calculating a power measurement associated with the input signal if the power measurement mode is selected. In another aspect, an apparatus is provided for power measurement. The apparatus includes means for selecting between an active mode and a power measurement mode, means for decoding an input signal if the active mode is selected, and means for calculating a power measurement associated with the input signal if the power measurement mode is selected.

Abstract: A system, apparatus and method are provided for testing a secondary servo control circuit in a redundant control configuration. A first circuit is configured to receive a control signal and to control an attribute of an actuator based on the control signal using a first control input of the actuator. A second circuit is configured to test operation of an actuator circuit using a test signal. The actuator circuit includes at least part of the second circuit and a second control input of the actuator. The test signal is selected to avoid causing independent motion of the actuator. The actuator could be a dual coil servo valve, and the test signal could be a current (such as a DC current, an AC current, or a pulsed current) having a magnitude less than a bias current of the actuator.

Abstract: The present invention relates to a tester (100) for testing operational reliability of a cockpit oxygen distribution circuit (1) having a plurality of components (20, 30, 40, 50) ensuring supply of oxygen from the cockpit oxygen distribution circuit (1) to a cockpit crew of an aircraft in an emergency situation. The tester (100) comprises means (20?, 30?, 40?, 500 for electrically connecting the tester (100), in place of at least one of the components (20, 30, 40, 50), to the cockpit oxygen distribution circuit (1), an indicator (120) for indicating that the electrical connection of the tester (100) to the cockpit oxygen distribution circuit (1) has been established in a predefined manner, and switching means (RL1, RL2, RL3, RL4) for initiating an output signal of the tester (100), wherein the output signal is indicative of an operating condition of the component (20, 30, 40, 50) when being connected to the cockpit oxygen distribution circuit (1).