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Permittivity Measurement with HF2IS Impedance Spectroscope

on 17.11.2015 at 12:47 by James Wei
Introduction Dielectric spectroscopy is a form of impedance spectroscopy where the dielectric properties i.e. permittivity of a medium is characterized as a function of frequency. This technique allows us to evaluate the energy storage and dissipation properties of a capacitor […]

Characterization of Dye-Sensitized Solar Cell Impedance at Low Frequencies with HF2IS Impedance Spectroscope

on 03.07.2015 at 12:29 by James Wei
Co-author and main contributor: Dr. Antonio Braga Introduction The electrical impedance spectroscopy (EIS) technique is used to characterize the physical-chemical processes of the dye-sensitized solar cells (DSSC) using different types of metal oxides semiconductors, dyes or electrolytes [1]. The EIS […]

Deep Level Transient Spectroscopy Using HF2LI Lock-in Amplifier

on 23.05.2015 at 10:58 by James Wei
Co-author and main contributor: Dr. Antonio Braga Introduction A very small concentration of lattice point defects, or simply defects, such as vacancies, impurities, dislocations, grain boundaries or cavities, are responsible for creating many different properties in semiconductors. Defects play a crucial […]

Measuring the I-V Characteristic of PN Junction Devices with HF2LI Lock-in Amplifier

on 13.05.2015 at 09:24 by James Wei
Co-author and main contributor: Dr. Antonio Braga Introduction The p-n junction is the fundamental building block of semiconductor material electronics device such as transistors, diodes, sensors, laser, light emitting diodes, as well as solar cells. If one wants to know […]

Using HF2IS Impedance Spectroscope as a DC Impedance Meter

on 18.11.2014 at 11:11 by James Wei
Up until now, the blogs related to impedance measurement are mostly related to how to setup a measurement and optimize the ac frequency sweeps. As a matter of fact, the HF2IS Impedance Spectroscope can also be used as a dc […]

Detecting a small fraction of impedance changes with improved sensitivity

on 16.09.2014 at 13:54 by James Wei
Introduction There are normally two types of impedance measurement. The first type is the dynamic impedance measurement where impedance can change rapidly over time. This is the case in electrical impedance spectroscopy (EIS) in microfluidics for cell counting and cell discrimination […]

Processing Data in Different Applications with LabOne Net Link

on 01.07.2014 at 14:01 by James Wei
Many HF2 and UHF users take advantage of the API provided by Zurich Instruments to program in Matlab, Python, Labview and C to record data from the HF2 and UHF devices. Both HF2 and UHF also provide the possibility to stream […]

Reduce Ground Disturbances when using HF2TA Transimpedance Amplifier in a Measurement Setup

on 26.02.2014 at 18:13 by James Wei
Ground loops can potentially pose a serious problem in many measurement setups. Due to the multiple connections to and from the HF2TA current amplifier and other external components, several ground loop related issues can pop up in the signal being […]

Taking Your Microfluidics EIS Measurement to the Ultra-High Frequency Domain

on 08.01.2014 at 13:28 by James Wei
Introduction The HF2IS Impedance Spectroscope from Zurich Instruments is a versatile tool suitable for label-free electrical impedance spectroscopy (EIS) of single cells in the domain of cell counting and discrimination. The high frequency range, from DC to 50 MHz, and the […]

Square Wave and Sawtooth Wave Generation with HF2LI Lock-in Amplifier

on 13.12.2013 at 09:52 by James Wei
Normally, HF2LI users only generate sinusoidal waveforms with the HF2LI lock-in amplifiers. The HF2LI can also generate square and sawtooth waves, although this is not a supported feature. This blog will go through the setups necessary for doing just that. […]