Posts tagged mfia


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)。


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。

Gated data transfer for increased data sampling rate on the MFIA and MFLI

on 19.12.2018 at 14:42 by Tim Ashworth on Blog of Tim Ashworth
Introduction For measurements of signals which are rapidly changing, for example, when measuring capacitance transients in Deep Level Transient Spectroscopy (DLTS), high temporal resolution is required. In its standard operating configuration, the MFIA (or MFLI with MF-IA option) can sample […]

Square pulses for DLTS measurements on the MFIA

on 22.08.2018 at 16:00 by Tim Ashworth on Blog of Tim Ashworth
Producing square voltage pulses and capturing capacitance transients This blog post shows how to produce square voltage pulses and capture the resulting capacitance transients on a short timescale (20 us) for example, for Deep-level Transient Spectroscopy (DLTS) measurements. Using the LabOne Threshold Unit […]

Rapid and Accurate C-V Measurements on the MFIA

on 19.08.2018 at 15:50 by Tim Ashworth on Blog of Tim Ashworth
Fast C-V measurements up to 3000 V/s This blog post demonstrates the ability of the MFIA (also MFLI with MF-IA option) to measure capacitance on a short timescale (20 us) as a function of DC bias voltage, for example, for […]

Displaying Nyquist Plots on the MFIA Impedance Analyzer

on 27.09.2017 at 13:45 by Tim Ashworth on Blog of Tim Ashworth
A short guide to displaying impedance data as Nyquist plots on the LabOne Sweeper of the MFIA. Nyquist plots are a key tool when displaying complex impedance data. They display the real part of the signal on the X-axis against […]

LCR Meter vs Impedance Analyzer

on 11.08.2017 at 14:52 by Tim Ashworth on Blog of Tim Ashworth
We are often asked about the difference between LCR Meters and Impedance Analyzers, especially since the MFIA offers the functionality of both instruments. LCR-meters and impedance analyzers are fundamentally similar, in that they both measure impedance parameters such as capacitance, […]

Teraohm Impedance measurements with the MFIA Impedance Analyzer

on 29.05.2017 at 11:45 by Tim Ashworth on Blog of Tim Ashworth
Introduction This blog post describes impedance measurements of a 1 TΩ commercially-available resistor using the MFIA impedance Analyzer. This further demonstrates the performance of the MFIA to accurately measure challenging components with very high impedance.  Thanks to a clear reactance […]

Characterizing High-Q 100 pF Capacitors with the Zurich Instruments MFIA

on 30.01.2017 at 09:30 by Tim Ashworth on Blog of Tim Ashworth
Introduction In the last impedance blog post we discussed how the MFIA could be used to investigate 3000 F capacitors, here we turn to the other end of the spectrum to investigate 100 pF capacitors. Specifically, this blog post looks at […]

Using the MFIA Impedance Analyzer to characterize the ESR of a Super-capacitor

on 01.11.2016 at 10:14 by Tim Ashworth on Blog of Tim Ashworth
Introduction Super-capacitors are very useful devices providing power for applications ranging from SRAM to high-speed trains. The energy density is 10 – 100 times higher than that of standard (electrolytic) capacitors. And although they have a lower energy density than […]