Posts tagged mfia

Evaluate Interdigitated Electrode Sensors with the MFIA

on 16.06.2021 at 15:45 by Meng on Blog of Meng Li
In the previous blog posts, we demonstrated conductivity and permittivity measurements of liquids using an MFIA impedance analyzer. To reach the best accuracy, the measurements were carried out using immersion probes or dielectric fixtures with a precisely defined electrode area […]

Sensing finger movements via impedance measurements

on 19.01.2021 at 12:22 by magda on Blog of Magdalena Marszalek
Smart clothes, wearables and biosensors do not sound as futuristic as they used to. The development in this field of science and engineering is rapid and it is no longer a niche – as seen in the first or even […]

Proximity sensors: inductive or capacitive? Using the MFIA to measure the sensitivity and response time of both sensing regimes

on 07.01.2021 at 17:36 by Meng on Blog of Meng Li
Introduction A proximity sensor is a sensor that detects nearby objects without physical contact [1]. They are commonly used, in applications ranging from production lines to modern mobile devices, mainly thanks to their non-contact configuration and the accompanying long lifetime. […]

Function Generation Via Auxiliary Outputs on Your Instruments

on 26.11.2020 at 17:33 by Meng on Blog of Meng Li
Introduction Quite often one wants to generate an electrical waveform to assist his/her lock-in or impedance measurements. Such a function can be generated by a dedicated function generator, but ideally should be done in the same instrument, not only to […]

Webinar Zusammenfassung – Von Transportmessungen in der Festkörperphysik zur Impendanzanalyse in der Elektrotechnik

on 23.11.2020 at 16:25 by claudius on Blog of Claudius Riek
Dieser Blog Post erscheint mit dem Webinar “Von Transportmessungen in der Festkörperphysik zur Impedanzanalyse in der Elektrotechnik”. Im Anschluss möchte ich den Inhalt des Webinars kurz zusammenfassen und stelle auch die Folien zur Verfügung. Vor allem möchte ich mich bei allen Teilnehmern […]

Measuring Dielectric Properties of Materials with Varying Thickness

on 30.09.2020 at 08:52 by Meng on Blog of Meng Li
Introduction A dielectric is traditionally defined as an electrical insulator, with very poor conductivity at DC [1]. However, because of its polarizability, charges can be stored in a dielectric material, typically in the format of dipoles, in the low and […]

Webinar Q&A- Impedance Analysis; Measuring Fast and Low

on 23.06.2020 at 08:01 by Tim Ashworth on Blog of Tim Ashworth
This blog post answers the many welcome questions from the audience during the recent webinar “Impedance Analysis; Measuring Fast and Low”. This webinar covered two distinct and equally important impedance measurement challenges. The first involves measuring the low equivalent series […]

Multiplexed Impedance Measurements with the MFIA

on 17.06.2020 at 13:43 by Meng on Blog of Meng Li
Introduction Having more impedance measurement channels is often desirable in many applications. For instance, in electrical impedance tomography (EIT), it is common to have many channels to achieve enough spatial resolution (144 electrodes on the thorax) [1]. Naturally, this can […]

Electrochemical Impedance Spectroscopy of Tap Water with the MFIA

on 06.01.2020 at 18:09 by Meng on Blog of Meng Li
Introduction Electrochemical impedance spectroscopy (EIS) is a popular non-destructive technique to characterize the physicochemical properties of materials, particularly at the solid-liquid (or electrode-electrolyte) interface. Despite the complexity of the measured data, EIS can be used to study many electrochemical devices […]

使用MFIA阻抗分析仪进行自动化二维阻抗扫描

on 24.09.2019 at 11:05 by Meng on Blog of Meng Li
很多器件和材料的阻抗都受到频率和其它参数(例如DC偏置电压)的影响。为了能够完整的表征这些样品,我们需要一种能在两个维度下进行参数扫描的阻抗分析仪。通过使用LabOne自带的任意5个API之一,我们可以轻易控制MFIA阻抗分析仪(或者MFLI锁相放大器和MF-IA升级选件)来进行这种全面参数分析。本文将详细说明如何使用简短的Python 3.7的程序,进行多参数维度的阻抗扫描。

Reloading Data into LabOne Modules

on 29.08.2019 at 12:48 by Tim Ashworth on Blog of Tim Ashworth
LabOne now supports reloading data into the LabOne Modules when using the HDF5 file format. Starting from LabOne 19.05, data acquired in modules such as the Sweeper, DAQ, Scope and Spectrum Analyzer, can now be reloaded into the same LabOne […]

What is the Basic Accuracy of an Impedance Analyzer?

on 29.08.2019 at 11:09 by Tim Ashworth on Blog of Tim Ashworth
This blog explains the meaning of basic accuracy when referring to impedance analyzers. The accuracy of an impedance analyzer is a critical parameter that allows the user to know how close the measured impedance will be to the true impedance […]

Automated 2D Impedance Sweep on the MFIA

on 28.08.2019 at 15:43 by Meng on Blog of Meng Li
Many devices and materials exhibit an impedance which depends on both frequency and other parameters such as bias voltage. To fully characterize the impedance of these samples requires an impedance analyzer with the ability to sweep in two dimensions. The MFIA (and MFLI with MF-IA option) can be easily controlled via any of the five included APIs to open up the full parameter space of impedance analysis.This blog details a short script for Python 3.7 which demonstrates the ease in which multi-dimension impedance sweeps can be carried out.

使用MFIA阻抗分析仪测量DC-Link电容器的低串联等效电阻(ESR)和低串联等效电感(ESL)

on 17.07.2019 at 14:59 by Meng on Blog of Meng Li
直流支撑电容器(DC-link 电容器)本身和接口的ESL和ESR对绝缘栅双极晶体管(IGBT)开关模组的性能有着很大的影响。当IGBT模组关闭时,瞬时产生的电压浪涌会储存在寄生电感之中。为了降低或者消除此电压浪涌的影响,设计低ESL的直流支撑电容器至关重要。在本文中,我们将使用MFIA阻抗分析仪和专用的低ESL阻抗测试夹具来验证标称的器件参数。在1 kHz到5 MHz的测试频率范围内,最低的串联等效电感(ESL)仅为9.5 nH (742 kHz),而最低的串联等效电阻(ESR)仅为0.7 mOhm (11 kHz)。

使用MFIA阻抗分析仪表征超级电容器的串联等效电阻(ESR)

on 27.05.2019 at 14:48 by Meng on Blog of Meng Li
超级电容器(简称:超电容器)是应用广泛的储能装置,从小到SRAM,大到高铁都有应用。它的能量密度一般是传统电解质电容器的10−100倍以上。而和锂离子电池相比,虽然超级电容器的能量密度较低,但是功率密度却非常优秀。对电容器而言最主要的是以下三个参数:电容,漏电流,和串联等效电阻(ESR)。其中ESR能够反映器件自身发热。同时它还能显示器件的剩余寿命。在本文中,我们将使用MFIA阻抗分析仪,测量超级电容器在mHz到kHz频率范围段的动态ESR。使用阻抗分析对超级电容器造成的损耗较小,同时还能获取更多关于超级电容器内部工作原理的信息。与其他的阻抗分析仪相比,MFIA本身并不需要桥电路反馈,而是通过直接测量电流和电压来推导阻抗。这使得它能够轻易测量到低频率(mHz级别)的信号。ESR的最低值在46 Hz时仅0.33 mOhm。

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