A four-terminal pair coaxial ac bridge developed for calibrating both resistance and capacitance ratios working in the frequency range from 100 kHz up to 1 MHz is described. reference inductive voltage divider (IVD) makes it possible calibrate 1:1 10:1 with uncertainty of a few parts 105. The IVD calibrated by means series–parallel device (SPCD). Use same minimal changes SPCD, unknown impedances simplifies whole calibration process. balance conditions are fulfilled simple decades injecting...

A new series-parallel capacitance device (SPCD) for calibration of high-frequency inductive voltage dividers with nominal ratios N:1, N = 1...10, is described. fully coaxial design and well-defined planes four terminal-pair (4-TP) interface make it possible to evaluate SPCD uncertainties only a few parts per million at frequency 1 MHz.

Two bridges for calibrating four-terminal-pair (4TP) standards of self-inductance in the frequency range from 500 Hz to 10 kHz are described. The first is a multifrequency double-balance bridge linking inductance capacitance and second one modified Maxwell–Wien bridge, which inductive voltage dividers conjunction with fixed resistance used as balance controls. Precision followers serving unity-gain isolators assure that negligible currents drawn high potential terminals 4TP elements. When...

A national traceability chain from dc quantum Hall resistance (QHR) to capacitance has been established at Korea Research Institute of Standards and Science using various impedance standards coaxial bridges. An ac–dc calculable standard nominal value 12.9 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\text{k}\Omega $ </tex-math></inline-formula> was used as a transfer ac the frequency 1.541 kHz. Two...

Abstract The aim of the study was to predict fatigue life metallic bone plates employing SIMULIA fe-safe software. Two materials commonly used for surgical implants were subjected investigation: 1.4441 (ASTM F138) stainless steel and Ti6Al4V ELI F136) titanium alloy. material parameters two determined from experimental research. Four-point bending testing conducted on generations in order allow comparison prediction results with measured data experiments.

A Maxwell-Wien bridge with a non-classical structure has been developed. The allows four terminal-pair measurement of inductance standards in the frequency range 500 Hz up to 10 kHz. matter modifications concerns an application inductive voltage dividers (IVD's) and precision electronic circuits, behaving as precise followers. designed followers have tested results measurements are corrected on their amplitude phase errors. preliminary show that relative uncertainty (k=2) (nominal value 100...

As the final stage of development a new system for impedance calibrations, facility calibrating standards mutual inductance has been realized. Being based on three-voltmeter method, this makes it possible to calibrate 1 mH 100 at frequencies up 5 kHz with uncertainties order 0.01 %. An improved direct connection technique is used when routine calibrations inductors are made by means four terminal - pair LCR meter.

This paper describes improved calculable 4TP coaxial capacitance standards with nominal values 10 pF and 100 pF. Modifications of construction internal wiring made possible to lower better define mutual inductions between some standard's parts than in previous version. Frequency dependencies the were calculated up 1 MHz first measurements shown a good consistency theoretical calculations measurements. Achievable relative accuracy such type capacitors seems be on level <sup...

A double-balance bridge and a measurement set-up based on the three-voltmeter method are used to calibrate inductance standards by linking them with reference capacitors or resistors. For inductances from 1 mH 100 frequencies up 5 kHz, calibration uncertainties less than part in 104.

Abstract This work investigates the effect of specimen dimension on tensile behaviour and superelasticity plateau NiTi alloy with composition 56.31 wt.% Ni 43.69 Ti. The development stress-strain curves in testing was evaluated for two different dimensions specimens. resulting properties material were discussed relation to phase determined by EDX, XRD, DSC analysis.

Quadrifilar resistors with nominal values of 100 Omega, 1000 Omega and 10000 as well a coaxial resistor, have been realized their frequency dependences calculated from constructional parameters. With the aim experimentally verifying correctness mathematical models used in these calculations, ratios parallel equivalent resistances measured by means four terminal-pair transformer bridge.

This paper describes a hardware design of fully digital wideband PD meter based on application FPGA as well coupling device required for measurements. The designed has frequency bandwidth 1 kHz-10 MHz. signal is digitalized by fast 14-bit AID convertor sampling at 50 MSa/s. samples are read the FPGA, subsequently filtered number FIR filter banks and stored in 32 MB DDR memory. On request from PC software, send reduced form through Ethernet interface next processing evaluation all important...

This paper describes a design of two-channel digital compensation unit which has been developed for accuracy measurement four-terminal-pair (4TP) impedance standards by the three-voltmeter method. The FPGA based senses residual voltage on low potential port compared impedances continuously. sensing process is made means synchronous detection technique; principle lock-in amplifiers implemented each channel. Simultaneously proportional to injected into main measuring circuit via an injection...

This paper deals with a comparison between digital and analogue implementation of synchronous detection algorithm.The commonly used methods are presented in the paper.The describes FPGA-based hardware approaches, focusing on design.The characteristics analogue-to-digital converters measured.Both proposed approaches directly compared terms sensitivity long-term stability.The achieved results, along identified limitations improvements widely discussed.

Two versions of four terminal-pair resistance standards have been made from surface mount resistors. Frequency characteristics these standards, as well frequency a set quadrifilar resistors with calculable performance, measured by means an Agilent 4285A precision LCR meter. In case the resistors, agreed calculated ones within stated uncertainties.

A national traceability chain from dc quantum Hall resistance (QHR) to capacitance has been established at KRISS using various impedance standards and ac coaxial bridges. Two bridges developed by INRiM, were employed: a quadrature bridge, calibrating 1000 pF capacitors versus 103 kΩ resistors ratio linking the resistor values an ac-dc calculable calibrated in terms of QHR. The value obtained with new showed agreement (a few parts 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A two-channel compensation unit based on an application of a digital signal processor is described. This special device, having implemented the algorithm synchronous filtering, used for compensations spurious voltages in measurement set-up three-voltmeter method. The works frequency range 500 Hz-5 kHz. If applied into system, it has attained level residual about few muVs. Thanks to this fact, calibration inductance standards 1mH-100mH can be made with uncertainty less than 1 part 10 <sup...

Event Abstract Back to Reinforced thermoplastic composite materials for use in orthopaedics Radek Sedlacek1*, Zdenek Padovec1*, Milan Ruzicka1*, Pavel Ruzicka1* and Michal Kral1* 1 Czech Technical University Prague, Faculty of Mechanical Engineering, Department Mechanics, Biomechanics Mechatronics, Czechia Introduction: In recent years, the development fibre-reinforced has led technological advances across a wide range applications modern orthopaedic medicine prosthetic devices. Composites...

This paper describes a developing of an analog to digital front-end suitable for the frequency domain spectroscopy (FDS) high-voltage machines. The principle FDS is described and requirements instruments utilizing this method are stated. design as base analyzer instrument. A basic implementation vector voltmeter described. verified in order stability, phase shift sensitivity accuracy.

This paper is focused on the implementation of a Time-to-Digital Converter (TDC) inside an FPGA circuit aimed at specific application in field comparison two time scales maintained by primary standards (atomic clocks). The design requirements TDC were tailored to meet needs this intended use. That means there need for wide measuring range hundreds milliseconds with resolution as best possible (smaller than 10 ps). Commercially-available TDCs market do not fulfil above mentioned [2]....

Two bridge circuits for relating three-terminal or two-terminal pair impedance standards of any kind are described, balancing which is made by voltages supplied from stable generators. In the first case two supplied, amplitude and phase one them being controllable. Four used in second only their amplitudes changed course process. As a particular form circuit, coaxial quadrature resistance capacitance has been realized tested.

This paper discusses the problems of noninvasive diagnostic high-voltage machines. The main role is to predict an upcoming machine failure. Frequency response and frequency domain spectroscopy methods are studied in this paper. compared terms common instrumentation features. A development a hardware platform intended for both presented. evaluated accuracy with laboratory instrumentation. results evaluation showed proposed solution able implement have measurement comparable market available...

CSIR-NML is in the process of developing ac bridges to realize capacitance from a quantum Hall resistance system. This involves development resistors with calculable frequency dependence. We describe and evaluation coaxial resistor that based on design by Haddad [1969].