摘要:
A measuring device having a detector with at least one detector element and, connected downstream of the detector, a DC voltage amplifier with at least one input (and at least one output. The DC voltage amplifier provides at least one negative-feedback path, which extends from its at least one output to its at least one input, wherein at least one further detector element is disposed in the negative-feedback path.
摘要:
To measure the effective directivity and/or the effective source port match of a test port of a system-calibrated vector network analyser, a precision air line short-circuited at the outlet is connected, and the complex reflection coefficient is measured at the inlet of this precision air line at a sequence of measuring points within a predefined frequency range. At the same time, for the effective directivity the sequence of the measured complex reflection coefficients is subjected to a discrete Fourier transformation and the baseband filtered out of the spectrum thereby formed. The sequence of effective directivity values is obtained by subsequent inverse Fourier retransformation.
摘要:
To measure the effective directivity and/or the effective source port match of a test port of a system-calibrated vector network analyser, a precision air line short-circuited at the outlet is connected, and the complex reflection coefficient is measured at the inlet of this precision air line at a sequence of measuring points within a predefined frequency range. At the same time, for the effective directivity the sequence of the measured complex reflection coefficients is subjected to a discrete Fourier transformation and the baseband filtered out of the spectrum thereby formed. The sequence of effective directivity values is obtained by subsequent inverse Fourier retransformation.
摘要:
A grid module of a scattered-radiation grid is disclosed. The scattered-radiation grid includes a number of grid modules disposed next to one another with a plurality of webs, especially for use in conjunction with a CT detector, a CT detector and a CT system with such a detector. In accordance with an embodiment of the invention, at the joining surfaces of the grid modules, the webs located there are provided with breakthroughs to compensate for a disproportionate reduction in scattered radiation.
摘要:
A test-signal detection system provides a probe, a first transmission line and a measuring device. The probe is connected to the measuring device by the first transmission line. The first transmission line transmits broadband test signals to the measuring device. The test-signal detection system provides at least one further transmission line. The probe is additionally connected to the measuring device at least indirectly by the at least one further transmission line. The at least one further transmission line transmits DC-voltage test signals to the measuring device.
摘要:
In a microwave module with at least one semiconductor chip, which provides on its upper side a connecting-line structure formed in particular as a coplanar line, which is connected to at least one adjacent incoming and/or outgoing line structure formed on the upper side of the substrate, the chip is glued with its underside and all lateral surfaces, on which no high-frequency connecting lines lead to the chip, within a recess of a metal part with good thermal conduction.
摘要:
A method is disclosed for transmitting measurement data from a transmitter system to a receiver system by way of a transmission link of a medical device. In an embodiment, the measurement data, as input data of a transformation method, is transformed to output values and, after transmission, back transformed again, the values of the input data lying between a maximum value and a minimum value and an assignment function being used for compression purposes, to allocate an output value to every value of the input data, a root function being used as the assignment function for at least some of the values.
摘要:
A power measurement cell comprises at least one thermoelement (30) and at least two heating elements (20, 21, 25). A first heating element (20, 21) can be heated by a measurement signal. A temperature can be measured by means of the thermoelement (30). The two heating elements (20, 21, 25) have a very small spacing. The at least one thermoelement (30) and the two heating elements (20, 21, 25) have a high thermal coupling.
摘要:
A waveguide system comprises a differential waveguide with at least one first and one second signal conductor, which are coupled to one another within the waveguide, and a divider network with front network elements disposed at a front end of the waveguide in the signal-flow direction and with rear network elements disposed at a rear end of the waveguide in the signal-flow direction. The front network elements comprise a first parallel element, which extends in the direction from the first signal conductor to the earth conductor, and a second parallel element, which extends in the direction from the second signal conductor to the earth conductor. Alternatively, the parallel element can also be disposed between the signal conductors.
摘要:
The invention relates to a shelf element 1 being provided for releasable connection to at least one further shelf element 1, comprising at least two parallel plates that are spaced from each other and at least one plate that connects said parallel plates, wherein at least one of the plates is a mounting plate which is provided with and/or at least partly provides at least one device for connection to the further shelf element 1. With the shelf element 1 according to the invention, the device for connection to the further shelf element 1 has the form of a slot. Furthermore, the device is provided for receiving a connecting element 21 which allows for connecting two shelf elements 1. Moreover, the invention relates to a shelf 20 comprising at least two of said shelf elements 1, wherein said self elements 1 are releasably mounted to each other via at least one connecting element 21.