Abstract:
The method comprising: a) receiving, by an electronic test instrument (102), two or more synchronously acquired time-domain EMI signals; b) processing, by a computing device (103), the two or more measured time-domain EMI signals by means of: performing resolution enhancing and data reduction operations on the time-domain EMI signals; filtering the time- domain EMI signals; equalizing the frequency response of the electronic test instrument (102); applying a window function and combining the time-domain EMI signals, in the time domain; c) performing, by the computing device (103), a non-parametric spectral estimation on said processed signal(s) by applying one or more mathematical functions for obtaining the maximum-hold and the RMS power spectral density of the EMI which are then converted to disturbance voltage measurements complying with specific parameters of the EMI regulations; and correcting errors and performing unit conversion in the time and frequency domain using calibration factors.
Abstract:
A scanner system and method operable for high-resolution spatial scanning of an electromagnetic field radiated by an electronic device under test (DUT) are provided. The electromagnetic field level radiated by the DUT is measured with a probe array comprising a plurality of spatially separated switched probes, an analyzer, and a computer. An actuator changes the relative position of the probe array to the DUT by a distance less than or equal to the separation distance between the probes, and the electromagnetic field level is measured and stored again.
Abstract:
A local oscillator (LO) of a test system is set to an initial frequency whereupon a device under test (DUT) transmits a radio frequency (RF) signal to the test system. Characteristics of the RF signal are measured with the test system and used to identify magnitudes and frequencies of spurious signal products. The LO of the test system is reset to one or more subsequent frequencies that are offset from the initial frequency. One or more subsequent RF signals are transmitted from the DUT to the test system, with the DUT maintaining its original signal settings. Characteristics of the subsequent RF signals are measured with the test system and used to identify magnitudes and frequencies of spurious signal products for each of the subsequent LO frequencies. The spurious signal products that have shifted in frequency for each of the subsequent LO frequencies as self-generated signal products can then be identified.
Abstract:
The invention provides a method and apparatus for electronically testing the safety of sources of energy such as electrical circuits, in explosive atmospheres such as high risk mining situations, using an electronic spark tester (EST) in place of the known mechanical spark test apparatus (STA). The EST typically uses an analogue subsystem (5) and a digital subsystem (6) connected by a digital to analogue converter (7) and an analogue to digital connector (8) to apply a simulated spark load to the energy source and measure the time varying current response to that load.
Abstract:
Apparatuses and methods for analysing at least one characteristic of a test signal coupled out from one of a plurality of cable lines by a coupling unit to determine whether that test signal has propagated directly to the coupling unit via a single cable line or has propagated indirectly to the coupling unit via one or more coupling paths between different cable lines. The determination of whether the test signal has propagated directly to the coupling unit via a single cable line or has propagated indirectly to the coupling unit via one or more coupling paths between different cable lines, may advantageously be used for operational or diagnostic purposes, e.g. to identify interconnections between ports in a network.
Abstract:
In electrical mains supply interference voltages may occur which are related to poor connections and poorly functioning contacts in switches present in such distribution networks. Such poor contacts and poorly functioning switches may cause heat generation and may ultimately cause fire. The invention provides determination of an interference level in the voltage of a mains supply on the basis of which fire-hazardous situations can be detected and subsequently remedied. A device and a method according to the invention determine this interference level by detecting interference voltages in a specified frequency band, converting the same into interference pulses and determining the interference level on the basis of the number of interference pulses per unit time. The device and method according to the invention can be used for fire protection.
Abstract:
A method of characterizing a contactless transmission element (100) is provided, wherein the method comprises sampling a first value of a first physical parameter indicating a property of a contactless transmission element (100), and determining an interference reliability value for the contactless transmission element (100) based on the sampled first value of the first physical parameter. In particular, this interference reliability value may relate to a liability of the contactless transmission element (100) to an external field or to external influences.