High sensitivity, quick response, small size, non-contact sense and low-power requirement, make amorphous wires attractive for sensors and micro-sensors realization. Negative factors accompany magneto-impedance sensors based on amorphous wires. They must be compensated for an efficient use of the devices and therefore the behavior of the sensing element must be well characterized. The paper highlights most important characteristics of amorphous wires and proposes an instrumentation set-up based on vector-voltmeter analyzer useful for carrying out their measurement.
The extension of high-power applications in industrial processing is very much dependent on the development of efficient and powerful transducers. Obviously, when dealing with industrial applications. One tries to implement the capacitance and inductive transducers’ field to temperature measurements, at present, losing. The illustrated temperature capacitive and inductive transducers by an HG thermometer cover this losing. Moreover these transducers respond to the necessity, in the industrial environment, for combining accuracy with the simplicity and product durable life. Which makes for...
An output mechanical power of electrical driving system is directly related to electrical power consumption; proportional relation. This direct relation is a foundation of concluding of failures, manufacturing imperfections, wear and tear of gears used in driving systems. The paper is devoted to consideration how to investigate abnormal mechanical states caused by mechanical parts (gears in this case) of driving system based on analysis of consumed electrical power. Driving systems for power transmission are using different gears boxes (reducers and multipliers), mainly are helical gear...
A residential gateway is a network device employed in the Small Office / Home Office (SOHO) field. It is the front-end allowing the SOHO customers to connect their own network to the Service Provider’s (SP) one. The paper deals with the problem of ensuring residential gateway interoperability with different SOHO and SP networks also when the manufacturer’s and SP’s test benches are different. In particular, a remote testing system is proposed enabling the manufacturer to test its device inside the SP network. The proposed solution consists of a remote testing board to be connected to the...
This paper presents the newly developed measuring system for testing of the magnetostrictive properties of the soft magnetic materials. The semiconductor strain-gauge measurement technique is utilized in this system. As a result the high resolution of measurements was achieved. Moreover, due to utilization of the both strain-gauge bridge and fluxmeter the simultaneous measurements of the flux density B and the magnetostriction λ as the function of magnetizing field H is possible. For this reason developed measuring system creates a new possibility of determination of the B(H), λ(H) and λ(B)...
One of the methods of shortening the response time of first order inertial device is using the step signal with overshooting. In the article it is discussed the source of step signal with overshooting with one calibrator and with two calibrators and analog multiplexer. There are described results of simulation tests of the response time on input signal from both sources. Results of tests proved accuracy of the solutions proposed.
This paper proposes a diagnosis method for electric machine faults by measuring the harmonic spectrum of stator current. In our assumption an electrical machine is excited with a randomized modulation of switching in power converters for reducing filtering requirements and acoustic noise in motor drive applications. Therefore, we propose a new approach for modelling the randomized modulation is the availability of an explicit control of time-domain performance, in addition to the possibility of shaping the power spectrum of signal of interest. The tool used here for investigating and...
The paper presents a virtual system for locating and measuring near-field electromagnetic emissions in the frequency bandwidth from 100 kHz to 500 MHz. The implemented software controls the test equipment and performs both E and H-field strength measurements. The virtual system is not intended to verify compliance with international emission regulations. However, it is helpful in characterizing the abnormal electromagnetic fields and in extracting frequency and time domain information.
In context of the oscillation-based-test (OBT) technique, a simple and low-cost method of testing oscillators by comparison of finite segment of waveform with the ideal sine-wave is presented. The method is based on the subtraction of two sigma-delta modulated signals with the aid of a 1-bit subtractor that employs oversampling based noise-shaping. An up/down counter extracts the average of the bit stream that is used as a fault signature. The simulation results on the example of the Van der Pol oscillator show that the proposed fault signature is sensitive to the frequency and amplitude...
In this paper a method for sample point position measurement in the bit interval of Controller Area Network (CAN) nodes is presented. The position of sample point is an important parameter of CAN network node configuration, as it particularly influences the bit error rate and consequently frame error rate within the whole system. The measurement method, implementation of a specialized test instrument and the measured results evaluation are described, as well as validation procedure of the described method and its results.