The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Measurements of the response of leaf photosynthesis to CO2 are vital for understanding the response of our planet to climate change and developing novel strategies for improving food production. The speed of these measurements are often limited by the ability of the leaf gas-exchange analysis instrumentation to reach and maintain a desired set point. This paper develops a biophysical model of a leaf...
In this paper an modern solution to measure and analyse selected parameters of variable reluctance synchronous motor is presented. An virtual instrument with multiple options for selecting the analyzed parameters is described. The values of motor measurement voltages, currents and speed are read from a specified folder. With present virtual instrument it can be see the motor currents, voltages and...
The measurements for the assessment of the electric power quality are often carried out in hostile electromagnetic environments. The aim of the paper is analyzing if and how both radiated and conducted electromagnetic emissions can disturb the measurement system used to quantify these disturbances. To achieve the target, an experimental approach is proposed, which, by means of a simple and fast test,...
The LXI is looked as the next-generation test bus. The paper used an instrument based on LXI technology to fetch two channel's data. But it is difficult to use instrument in a LXI test system directly. It developed an application program of the instrument with LabView language. On the one hand it can fetch data of two channels at the same time; on the other hand it can calculate dynamically ten measurements...
A method of reconstructing the nanosecond signal is carried out based on Labview. A standard nanosecond pulse is got from pulse generator, and then the pulse is measured with a voltage divider. Through model identification, the math expression of the divider can be get. The best order of the filter is got simultaneously. The study of reconstructing input signal of measurement system is carried out...
The effects of the smoothing of the results on the measurement accuracy of powers and RMS values in systems under nonsinusoidal conditions are considered. The presence of time measurement intervals of given rated duration is assumed. Suitable formulas to evaluate the errors introduced by the desynchronization of measurement interval for active power, and voltage and current rms values are developed...
A circuit for on-chip measurement of long-term jitter, period jitter, and clock skew, is demonstrated. The circuit uses a single latch and a voltage-controlled delay element, and is evaluated in a stand-alone pad frame. Excellent reproduction of jitter measured by oscilloscope is shown. Measured jitter resolution is 1 ps or better. The circuit is also incorporated into a 2 GHz clock distribution network...
This article describes the present status of research on biomagnetism, an interdisciplinary field of research involving biology, engineering, medicine, physics, psychology and other areas. Biomagnetic fields are caused either by electric currents in conducting body tissues such as the heart, the brain and muscles, or by magnetized material in lung contamination. These magnetic fields, although measurable,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.