193 results about "Impedance variation" patented technology

The invention relates to the technical field of anti-electromagnetic interference, in particular to an anti-electromagnetic interference method for a flywheel energy storage system of a data center, which comprises the following steps: acquiring change rate data of the rotating speed and the angular speed of a flywheel, judging the attribution of a disturbance interval, recording change characteristics, extracting an interference identifier, comparing the interference identifier with impedance change, and generating a switching node. Frequency response and reflection coefficient characteristics of the filtering unit are detected, a coupling channel generation label is identified, and output fluctuation is evaluated to generate an anti-interference capability state label. According to the method, the surface resistivity of the shielding layer is dynamically switched according to the comparison result of the specific interference triggering identification bit and the signal link impedance change state in each disturbance stage through classification judgment and correlation marking of inertial disturbance, so that the effect of suppressing electromagnetic interference in real time is optimized; the influence degree of electromagnetic interference can be dynamically evaluated in the system operation process, and the adaptability of the energy storage system to the electromagnetic interference is judged and adjusted in real time.

The invention discloses a power cable insulation state evaluation method and system based on a broadband impedance spectrum, relates to the technical field of cable insulation, and is used for solving the problem that a defect grading result deviates from a real aging process of a cable. The method comprises the following steps: extracting broadband reflection data, calling a corresponding insulation aging type, converting a phase sequence in the broadband reflection data into a phase deviation coefficient for region screening, extracting a reflection peak value based on a reflection coefficient amplitude sequence, calling a corresponding impedance variation reference according to the insulation aging type, and performing region screening. The method comprises the following steps: generating impedance variation characteristics in combination with a reflection coefficient peak value, judging whether a defect grading mechanism is entered, detecting discharge pulse count and insulation recovery time of a marked division region, generating marked division defect grades according to a detection result, and distinguishing impedance variation modes corresponding to different aging forms in judgment. And the defect grading result better conforms to the actual aging process of the cable.

The invention relates to the technical field of automatic welding, and discloses a micro welding seam tracking method and system based on electromagnetic induction. According to the method, a high-frequency alternating magnetic field is applied to a welding seam area through an exciting coil in the micro electromagnetic sensing core; an induction coil in the electromagnetic sensing core is used for detecting magnetic field disturbance caused by geometric shape changes of the weld groove, and induction signals are obtained; processing the induction signal through a signal processing circuit integrated in the probe, namely converting the impedance change of the coil into a voltage signal, demodulating and filtering the voltage signal, and extracting a direct-current voltage signal corresponding to the deviation of the probe relative to the central position of the welding seam; the direct-current voltage signals serve as position feedback information to be output to a welding robot control system; and the movement track of the welding robot is adjusted in real time according to the position feedback information, and welding seam tracking and path deviation correction are achieved.

The invention relates to a motor bench test safety management method and device, equipment and a medium, and relates to the field of motors. The method comprises the following steps: acquiring three-phase current ripple data of an energy flow in a feedback path; performing feature analysis based on the three-phase current ripple data, and determining abnormal heat source information; calculating an impedance value and an impedance change rate of each feedback path based on the monitoring data of the feedback paths, and determining a risk path; wherein the feedback path is a path through which the energy flow flows from the motor to the power grid and / or the energy storage unit; updating a first feedback path based on the abnormal heat source information and the risk path; and performing path switching based on the first feedback path, and triggering an early warning signal. By adopting the method, the test safety can be ensured.

The invention, which relates to the technical field of distributed power generation, discloses a modularized distributed photovoltaic inverter cluster intelligent regulation and control system comprising an impedance identification module, an impedance control module, a state sensing module, a fault diagnosis and isolation module, a power distribution module and a cluster fault control module. The power grid impedance monitoring module is used for monitoring voltage and current signals of a grid-connected point of the photovoltaic inverter, calculating a power grid equivalent impedance value, an impedance change trend and a harmonic component proportion of the current photovoltaic inverter, and generating power grid impedance information. The impedance identification module and the impedance control module are arranged, adjustment is carried out based on the virtual impedance parameters, the resonance problem caused by power grid impedance fluctuation is effectively suppressed, the situation that grid-connected current distortion affects the electric energy quality is avoided, the photovoltaic inverter cluster stably operates in a power grid impedance change scene, and the power grid impedance change efficiency is improved. And the cluster grid-connected power quality and the adaptability to the power grid environment are improved.

The invention discloses an impedance self-adaptive high-frequency probe, a probe card and a testing method, and belongs to the technical field of semiconductor high-frequency testing. When an existing high-frequency probe is used for a crimping test, a conductive probe body of the existing high-frequency probe generates mechanical deformation due to contact pressure, so that characteristic impedance is deviated, and uneven pressure in an array causes impedance dispersion. The problem is solved by coating the outer side of the conductive needle body with a composite material layer, the composite material layer is composed of an elastic insulating matrix and metal particles dispersed in the elastic insulating matrix, the metal particles have bimodal particle size distribution, and the total integral number is 30%-40%. When the probe is pressed, the composite material layer is subjected to reversible microscopic reconstruction, the effective dielectric constant of the composite material layer is increased along with the increase of the pressure, and the generated impedance change can counteract the impedance drop caused by the deformation of the conductive probe body, so that the self-adaptive stability of the characteristic impedance of the probe under the change of the pressure is realized. The impedance dispersion of the probe array can be remarkably reduced, the consistency and precision of high-frequency testing are improved, and the process compatibility is good.

The invention belongs to the technical field of electromagnetic detection, and relates to an electromagnetic detection multi-level current emission system for a plateau environment and a control method. The control method comprises the steps of calculating load model impedance; analyzing an MFPWM control process, and determining an optimal control parameter by using an optimization target of transmitting spectrum intensity maximization; and MFPWM optimization control: realizing directional power distribution and independent regulation and control of each frequency component by adjusting the frequency and amplitude of each modulation signal component. A multi-level topological structure is adopted, high output voltage is achieved while switching voltage stress is reduced, and the problems that cost rises and system complexity is too high due to the fact that a traditional H-bridge inverter depends on high power supply voltage are solved; by matching with multi-frequency pulse width modulation optimization control, spectrum energy can be flexibly configured, high-frequency components of transmitted signals are enhanced, and the spectrum energy utilization rate and the signal-to-noise ratio are improved; grounding impedance changes in a high dynamic range can be accurately tracked, and the requirements of deep geological electromagnetic detection in an extreme environment are met.

The invention provides an electrostatic chuck internal defect detection method and device, a terminal and a medium, the electrostatic chuck comprises a ceramic layer and a metal layer, the method comprises the following steps: carrying out point-by-point contact scanning on the surface of the ceramic layer through an eddy current probe, and collecting an impedance change value corresponding to each scanning point to obtain impedance change data; inputting impedance change data into the impedance thickness model, and calculating the ceramic layer thickness of each scanning point to obtain ceramic layer thickness data; and processing the thickness data of the ceramic layer, and determining an internal defect area of the electrostatic chuck. According to the method, eddy current is induced in the conductive material by utilizing the alternating magnetic field, efficient and contact type defect detection is realized by analyzing impedance change, online nondestructive detection of the internal defect and the film thickness of the electrostatic chuck is realized, and the bump defect is accurately identified.

The invention provides a circuit board high-frequency characteristic detection analysis method and system based on a stub test platform, and the method comprises the steps: obtaining an S parameter of a PCB signal network based on a vector network analyzer (VNA), judging whether the signal transmission loss caused by a stub meets a detection requirement or not, and outputting the length of the stub and carrying out the TDR detection when a VNA detection result is unqualified; the size of a reflected signal of the PCB signal network is obtained based on a time domain reflectometer TDR, whether impedance change caused by a stub in a TDR curve is qualified or not is judged, and when a TDR detection result is not qualified, the specific position of the stub is output, and backdrill capacitance characteristic detection is carried out; capacitance characteristic parameters of the abnormal back drilling via hole are obtained based on back drilling capacitance characteristic detection, and the specific form of the stub is determined. The method and the system are specially used for detecting the stubs in the PCB high-density multilayer board, not only have the remarkable advantages of high precision, high speed and high reliability, but also provide solid technical support for accurate evaluation and strict quality control of product performance.

The invention discloses a coagulation and bipolar coagulation integrated control system for a surgical operating instrument, and relates to the field of medical equipment. The system comprises an interface module, an energy detection module, a storage module, a load model matching module and an energy output control module. According to the system, an energy detection signal is output to a surgical instrument before energy output, and a real-time biological impedance spectrum of a target object is obtained; determining a target model from pre-stored electrical load models according to the impedance spectrum, and calling a corresponding adaptive energy output strategy; and in the energy output process, the impedance change of the target object is monitored, and the energy parameters are dynamically adjusted, so that the energy output is automatically stopped after the impedance change conforms to the preset stable target state. The self-adaptive precise energy control based on the real-time state of the tissue is realized, the problems of tissue carbonization, adhesion or incomplete coagulation and the like are effectively avoided, and the operation safety and effect are improved.

The invention discloses an electrical stimulation control method and device based on impedance feedback and a medium, and relates to the technical field of electrical stimulation. According to the scheme, a target electrical stimulation output mode set by a user is collected through a man-machine interaction module, and an initial impedance value of a detected target is detected through an impedance and voltage detection module; the main control module generates an initial output parameter according to the target electrical stimulation output mode and the initial impedance value, and the electrical stimulation module executes electrical stimulation output; the dynamic impedance value of the measured target is continuously monitored in the output process, and when the impedance of the measured target changes, the initial output parameter is adjusted so as to correct the electrical stimulation output. That is, according to the scheme, the impedance change of the measured target is continuously monitored in the electrical stimulation output process, and when the difference between the dynamic impedance value and the initial impedance value is found, the initial output parameter is adjusted to correct the electrical stimulation output so as to adapt to the dynamic change of the human skin impedance and maintain the stability of the current; and the safety and the reliability of electrical stimulation output are ensured.

The invention belongs to the technical field of non-magnetic material nondestructive testing, and discloses a non-ferromagnetic material thickness and conductivity synchronous measurement method based on eddy current phase characteristics, and the method comprises the specific steps: S1, estimating the conductivity and thickness range of a to-be-tested piece based on data such as a product specification or an industrial standard; s2, determining excitation frequency according to a frequency selection criterion (high frequency enables the skin effect depth to be smaller than 1 / 3 of the thickness, and low frequency enables the skin effect depth to be larger than two times of the thickness of the sample); s3, an eddy current method is adopted to obtain the impedance variable quantity phase of the to-be-measured non-ferromagnetic material; and S4, substituting the phases into corresponding simplified model formulas respectively, and obtaining the conductivity and the thickness at the same time. Aiming at the problems of multiple calibration, blindness in excitation frequency selection, low single-parameter measurement efficiency and the like in conductivity or thickness measurement by an existing eddy current method, double-parameter output of single measurement is realized, multiple calibration and inversion calculation are not needed, the calculation is simple, rapid and accurate, the hardware cost is low, and the applicability is wide.

Using “in-situ on-die time-domain reflectometry (TDR)” with data signal paths of integrated circuits, printed circuit boards, and data processing equipment and systems allows testing, verification and troubleshooting of data channel signal path impedance variations including the package, escape routing, socket, board, and cable / connectors provides fast characterization thereof. Operation of “in-situ on-die TDR” uses existing analog-to-digital converter (ADC) and data transmitter (TX) drivers of an integrated circuit to act as a TDR sampling head by performing a user interface-based TDR sampling with a step-waveform generated by an integrated circuit TX driver. Then sampling the step-waveform with the ADC of the integrated circuit using spline interpolation to obtain the over-sampled waveform. Once the sampled step-waveform is obtained, the TDR profile of the sampled data channels may be calculated. Large amounts of impedance variation data may thus be collected during either integrated circuit manufacturer or customer-built data communications channel testing.

The invention relates to the technical field of electrical safety, and discloses a current monitoring and shielding leakage response method and system for SNELPD water immersion protection. According to the invention, the original current waveform is monitored in real time, so that the grounding state characteristic quantity is acquired according to the grounding current waveform data and the leakage current waveform data, and the final potential offset and the potential trend characteristic quantity are analyzed from the shell potential waveform, so that the insulation resistance change caused by water immersion can be captured earlier and more sensitively; then, a coupling mechanism and an evolution law between current and potential characteristics are mined, a comprehensive risk index is obtained, high-risk coupling states such as grounding efficiency reduction and potential accelerated drifting are accurately captured, the problem that in the prior art, multi-parameter internal relevance and a diagnosis blind area of a co-evolution law cannot be revealed is solved, and the diagnosis accuracy is improved. The accuracy and the reliability of early recognition of '0 potential' damage and shielding leakage risks caused by soaking of the SNELPD equipment are remarkably improved.

The invention relates to the technical field of new energy automobile part detection, in particular to an electrical performance testing method, testing device and equipment for a vehicle-mounted wire harness. The method comprises the steps of firstly obtaining test data under constant slope current excitation, and then performing resampling based on a preset energy step length to obtain to-be-analyzed data; further obtaining an optimal linear region, extracting the slope of a regression straight line of impedance and total energy in the optimal linear region, and obtaining a thermal resistance reference; further extracting the impedance change rate of each data point, and comparing the impedance change rate with the thermal resistance reference to obtain the slip characteristic value of each data point; further acquiring a slip judgment threshold according to the distribution of slip characteristic values in the optimal linear region; and finally, generating a test result based on the slip determination threshold and the slip characteristic value of the whole process data, accurately detecting the slip under strong thermal drift and inductive anti-interference, and solving the problems of missed detection and misjudgment in the traditional method.

The application discloses a kind of spark flashover point generation position prediction method and system of pulse high voltage power supply, obtain spark flashover characteristic database from initial time to the total number of spark flashover stored during current time, determine the spark flashover number of each partition in total number of spark flashover, based on total number of spark flashover and the spark flashover number corresponding to each partition, obtain the current occurrence probability of spark flashover of each partition, determine the instantaneous impedance variation law of each partition when flue gas working condition parameter changes, based on the current occurrence probability corresponding to each partition spark flashover and instantaneous impedance variation law of spark flashover, using random optimization algorithm, obtain the predicted occurrence position and predicted occurrence probability of spark flashover point next time.The application realizes the predicted occurrence position and predicted occurrence probability of spark flashover point next time, to improve the intelligent control level of pulse high voltage power supply.

A radio frequency (RF) power generation system includes an RF power source that generates an RF output signal delivered to a load. An RF power controller is configured to generate a control signal to change the RF output signal. The controller adjusts a parameter associated with the RF output signal, and the parameter is controlled in accordance with a trigger signal. The parameter is adjusted within a predetermined number of bins. The parameters are adjusted according to a cost function, and the cost function is determined by introducing perturbations of each bin into actuators that affect the cost function. The actuator may control an external RF output signal, and the trigger signal may vary according to the external RF output signal. The perturbations are determined from a base group having dimensions less than the number of bins.

The invention relates to the technical field of electrical performance testing of a hydrogen production system, and discloses a key parameter monitoring and early warning method in a PEM water electrolysis hydrogen production process. The method comprises the following steps: injecting a composite excitation signal into an electrolytic cell, wherein the amplitude is related to real-time working current density and average temperature; acquiring multi-dimensional operation parameters, and performing time-frequency domain combined processing on the voltage response signal to obtain a time-frequency spectrogram; extracting a real-time harmonic distortion feature vector and an impedance variable quantity based on the time-frequency spectrogram, calculating a frequency spectrum offset quantity with a reference vector, and judging a fault tendency type and a fault tendency region by combining a frequency band energy ratio; and the spliced feature vectors are reasoned through a lightweight artificial intelligence model to output fault probability distribution, and graded early warning is executed. Through multi-signal excitation and multi-dimensional parameter fusion analysis, the timeliness and accuracy of fault recognition are improved, accurate monitoring and graded early warning of the running state of the electrolytic cell are achieved, and it is guaranteed that the hydrogen production process is stable and reliable.

This invention discloses a radio frequency (RF) power control system and method, and an RF plasma system. The method includes: before the electrostatic chuck cleaning begins, loading a preset parameter set of an impedance matching network associated with the selected cleaning process recipe, and driving the variable capacitors and variable inductors in the impedance matching network to their preset initial positions in the preset parameter set before applying continuous wave RF power; applying continuous wave RF power to the electrostatic chuck and initiating the cleaning process; during the cleaning process, acquiring the load impedance in the impedance matching network in real time at a preset sampling rate, generating a real-time impedance trajectory, and calculating the impedance change rate; determining the current cleaning stage of the electrostatic chuck based on the magnitude of the load impedance and the impedance change rate, and dynamically switching to the impedance matching algorithm corresponding to the cleaning stage to adjust the positions of the variable capacitors and variable inductors in the impedance matching network. This invention achieves low-reflection power matching throughout the entire cleaning process.

A battery high-temperature boundary dynamic early warning method based on an electrochemical impedance spectroscopy comprises the following steps: placing a battery in a high-temperature environment for a standing experiment to obtain electrochemical impedance characteristic changes of the battery at different temperatures; selecting the temperature corresponding to a turning point which is changed from decreasing to increasing along with the increase of the temperature in the electrochemical impedance spectrum as the high-temperature boundary temperature of the battery; the impedance change under the battery temperature and the characteristic frequency is monitored in real time, and high-temperature boundary early warning is carried out; in the second stage, thermal runaway early warning is achieved by capturing thermal runaway precursor characteristics, and a key time window is won for safety protection. According to the method, the electrochemical impedance characteristic of the battery is monitored in real time, the problem that the internal state change of the battery is difficult to reflect in real time by a traditional fixed temperature threshold method is effectively solved, a dynamic high-temperature boundary is established, and more accurate thermal management can be realized.

This invention belongs to the field of magnetic material measurement technology, and particularly relates to a power amplifier gain control method and system for magnetic characteristic measurement. The method includes the following steps: calculating the instantaneous rate of change of magnetization impedance at each moment, where the instantaneous rate of change of magnetization impedance is positively correlated with the time derivative of the ratio of output voltage to excitation current; calculating the dynamic load margin at each moment, where the dynamic load margin is negatively correlated with the instantaneous rate of change of magnetization impedance and positively correlated with the difference between the power amplifier's supply rail voltage and output voltage amplitude; determining the gain scaling factor at each moment, where the gain scaling factor is positively correlated with the dynamic load margin and its value ranges between a set upper and lower gain limit; and using the gain scaling factor to adjust the drive voltage command in real time to control the power amplifier's output gain, which can effectively improve the accuracy of power amplifier gain control for magnetic characteristic measurement.

An electromagnet (2) is proposed, which is penetrated by a longitudinal axis (A), comprising an armature chamber (4), an armature (6) which is arranged longitudinally movable in the armature chamber (4) along a stroke path (H), and a shielding element (8) which is arranged in the magnetic circuit and consists of a ferromagnetic material, wherein the shielding element (8) extends along the longitudinal axis (A) and forms at least one impedance change means (10) on the stroke path (H), which defines an impedance change position (P1.1, P1.2, P1.3, P1.4) for the armature (6) at which the electrical impedance can change when the armature (6) approaches and / or passes through, compared with a reference position (P2) on the stroke path (H) of the armature (6).

The present application relates to the technical field of new energy battery, and particularly relates to a low-temperature preheating method and system for lithium iron phosphate battery, wherein high-frequency small signal AC excitation is injected in the duty cycle gap of preheating discharge pulse, real-time impedance spectrum is calculated by synchronously collecting response voltage and current, impedance real part change rate of characteristic frequency point is extracted, and lithium precipitation risk coefficient is calculated in combination with the modulus value of single battery surface temperature gradient; lithium precipitation onset is determined based on impedance change trend criterion and risk coefficient threshold criterion, and the preheating duty cycle and pulse intermittent period are adaptively adjusted accordingly; meanwhile, differentiated power distribution is implemented according to the temperature gradient archives of each single battery, and temperature uniformity collaborative control is realized. The present application combines pulse self-heating with online impedance detection, realizes online nondestructive detection and safe and efficient preheating of lithium precipitation onset, effectively prolongs the service life of the battery pack, and improves the system reliability.

The application provides a metal film thickness measurement method and device for tungsten gate chemical mechanical polishing, comprising a sensor probe, a power module, a signal excitation module, a differential amplification module, a synchronous demodulation module, a data acquisition and processing module; the sensor probe comprises coaxially arranged excitation coils, detection coils and balance coils; the signal excitation module drives the three-coil resonance module to induce eddy current effect at the metal film to be measured; the differential amplification module converts the equivalent impedance change caused by the eddy current effect in the coils into a differential signal, and simultaneously improves the dynamic range through low-noise amplification; subsequently, the synchronous demodulation module multiplies the differential signal with a reference signal, and extracts a direct current component proportional to the signal amplitude through a low-pass filter; the obtained voltage amplitude signal is input into the data acquisition and processing module; the application can significantly amplify the weak signal related to the film thickness, effectively suppress common-mode noise, obtain nanometer-level thickness resolution, and has a high signal-to-noise ratio.

The invention relates to a manufacturing method of a power amplifier for improving power back-off efficiency, which belongs to the technical field of radio frequency microwave circuits, and comprises the following steps: step 1, based on load characteristics of an active device, determining an optimal efficiency impedance point under linear output power as optimal impedance of amplifier design; step 2, pulling out the determined optimal impedance by using a load pulling technology or LOADPULL, and drawing the optimal impedance on an SMITH original drawing; 3, based on the optimal impedance obtained through traction, low-loss impedance matching is achieved through the equal Q matching technology, loss and bandwidth are compatible, and impedance change and frequency band shaping are completed; 4, a two-stage or multi-stage amplification structure is adopted, and nonlinear compensation is realized by controlling grid voltages of front-stage and back-stage active devices and utilizing front-stage and back-stage gain compression and expansion characteristics; the method has the beneficial effects that the linear output power optimal efficiency impedance point is selected as the optimal impedance of the amplifier design, and the amplifier maintains higher linear output power and has higher rollback efficiency.

The invention discloses a high-selectivity broadband optical transparent energy selective surface and a control method. The high-selectivity broadband optical transparent energy selective surface comprises a single-layer optical transparent substrate and a parallel circuit structure, the LC series resonance branch is used for forming a fixed stop band in a conventional working state and can form a double-stop-band coupling structure with the field nonlinear device series branch after impedance change under strong electromagnetic attack so as to expand the protection bandwidth, and stable and efficient shielding in the whole target protection frequency band is achieved; and the field-induced nonlinear device series branch is used for performing main shielding and passband adaptive adjustment under strong electromagnetic attack through state switching of the field-induced nonlinear device, that is, the field-induced nonlinear device series branch can change the impedance characteristic under strong electromagnetic field excitation. The LC series branch and the field nonlinear device series branch are integrated on the single-layer light transparent base material, broadband protection performance and low insertion loss which are equivalent to those of a multi-layer or cascade structure are obtained, and meanwhile an extremely small section and a compact structure are achieved.

The invention relates to a simulation method for optimizing a high-speed wiring transition position. The method comprises the following steps: establishing a simulation model; adjusting the initial position of the reference plane of the fine line, and setting a variable for the moving distance of the reference plane of the fine line; traversing different values of the variables, and simulating to obtain TDR impedance results corresponding to different variable values; and according to a preset TDR impedance optimization target, a variable value conforming to the target is screened out from the TDR impedance result, and optimization of the high-speed wiring transition position is completed. By adjusting the initial position of the fine line reference plane and setting the displacement distance variable, the dynamic simulation analysis of the spatial position of the fine line reference plane is realized, and the impedance change rule of the transition area under different reference plane positions can be accurately captured; according to the method, the initial position parameter and the variable value range can be flexibly adjusted according to the difference requirements of different items on the length of the transition line; according to the method, the design period of the high-speed PCB is effectively shortened, and the design efficiency is improved.

The invention relates to an alternating current ice melting reactive compensation control method considering ground wire impedance change, which belongs to the technical field of alternating current ice melting, and comprises the following steps: S1, connecting a reactive compensation device into an ice melting loop, and injecting ice melting current into an overhead ground wire through an alternating current power supply; s2, measuring the length and the temperature of the ground wire in the ice melting process through a sag and temperature sensing and monitoring assembly; s3, on the basis of the ground wire impedance change model in the ice melting process, ground wire impedance change is calculated according to the ground wire length and the ground wire temperature; s4, substituting the ground wire impedance value into the heat effect theoretical model, and calculating the required reactive compensation capacity in combination with the temperature rise and the current effective value; and S5, based on the optimal array algorithm, controlling the reactive power compensation device to switch the switching capacitor bank array combination of the corresponding reactive power compensation capacity.

A radio frequency (RF) generator includes a power source configured to generate an RF signal applied to the load and a power controller coupled to the power source. The power controller is configured to generate a control signal to vary the RF signal, wherein the control signal adjusts a frequency of the RF signal in accordance with an external RF signal applied to the load. The frequency adjustment is variable in accordance with a cost responsive to a perturbation of the frequency of the RF signal.

Aspects of this disclosure describe a test strip that may include a sample input, assay circuitry, signaling circuitry, impedance circuitry, and / or energy harvesting circuitry. The sample input may be configured to receive a sample, such as a fluid sample. The assay circuitry of the test strip may be configured to perform an assay on at least a portion of the fluid sample. The signaling circuitry of the test strip may be configured to provide a modulated signal based on an output of the assay. The impedance circuitry of the test strip may be configured to present impedance changes to a touchscreen of an electronic device in accordance with the modulated signal. The test strip can then communicate data of the output of the assay (e.g., test results) to the electronic device using the touchscreen of the electronic device.