Posts in Category Tips & Tricks

Protect Setup From High Voltage Peaks

on 24.11.2017 at 11:24 by Marco Brunner on Blog of Marco Brunner
This blog describes how a setup can be protected from overvoltage which occurs switching off a coil. Fast changing currents induce transient voltages in an inductive load which can be expressed by the formula: V = – L (dI/dt) L is […]

Output Low-Frequency Sinusoidal Signal on the AUX Output of MFLI

on 30.05.2017 at 14:42 by Marco Brunner on Blog of Marco Brunner
  This blog shows how to output sinusoidal signals on the AUX Output with the MD multi-demodulator option. Keep in mind that the AUX output are not designed to output sinusoidal signals as the Signal Output.   Setup 1. On AUX […]

Fast auto-approach with MFLI Threshold Unit to control stepper motor

on 22.02.2017 at 11:19 by Romain Stomp on Blog of Romain Stomp
In many applications where the distance between two objects need to be reduced to a predefined gap, the ability to control a stepper motor with clear stop conditions from different sensors is of high practical interest. Such functionality can be […]

Compensating delay-induced phase shifts for high-frequency resonators

on 20.02.2017 at 14:31 by Romain Stomp on Blog of Romain Stomp
Phase-Locked Loop (PLL) or other PID controllers on nano-mechanical resonators rely on clean phase signals that exhibit large slope, or significant phase shift, around the resonance frequency. For really high-frequency NEMS and opto-mechanical systems above a few tens or hundreds […]

LabOne for HF2: using digital lines as trigger sources

on 03.02.2016 at 11:39 by Romain Stomp on Blog of Romain Stomp
Since LabOne 15.11 release and onward, accessible from our download area, all HF2LI users with the enabled HF2LI-WEB option can now benefit from the latest software developments that were previously reserved for the UHFLI. One tool that is now totally new for this […]

LabOne Software Trigger as a tool for multichannel mapping applications

on 25.11.2015 at 13:27 by Romain Stomp on Blog of Romain Stomp
In earlier blogs, we presented several methods to synchronize data acquisition with third party instruments, either via the DIO input as a Hardware trigger (TTL pulse), some gated triggering scheme for pass/fail analysis or to capture only transient phenomena in a longer […]

Dynamic suppression of unwanted frequency components with an HF2LI

on 26.06.2015 at 14:17 by Paolo Navaretti on Blog of Paolo Navaretti
There are many experimental situations in which the component of interest in a signal is not the strongest one, but some other related component, for instance the side bands in amplitude or frequency modulated signals. In such a case, the […]

Pass/Fail Tests for Failure Analysis

on 08.06.2015 at 16:34 by Romain Stomp on Blog of Romain Stomp
For quality control in manufacturing process, there are many ways to tests for transistors or other component failure, but for high throughput verification usually simple Pass/Fail tests are required. Since devices are tested for various functions, different tests need to be performed […]

Deep Level Transient Spectroscopy Using HF2LI Lock-in Amplifier

on 23.05.2015 at 10:58 by James Wei on Blog of 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 on Blog of 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 […]

Detecting a small fraction of impedance changes with improved sensitivity

on 16.09.2014 at 13:54 by James Wei on Blog of 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 […]

Synchronization of HF2LI/UHFLI with External Scan Engines for Image Acquisition

on 10.09.2014 at 23:50 by Romain Stomp on Blog of Romain Stomp
Since a lock-in amplifier is most of all used for synchronous measurements, it comes at no surprise that many HF2 or UHF users want to synchronize saved demodulated sample with their scan generator either for mapping, scanning or imaging in […]

How to Achieve More Stable Z-feedback in FM-AFM Mode

on 15.05.2014 at 16:38 by Romain Stomp on Blog of Romain Stomp
The challenge with FM-AFM mode (or NC-AFM for Non-Contact Atomic Force Microscopy) is that tip-sample interaction can be either attractive (negative frequency shift, -df) or repulsive (positive frequency shift, +df) which leads to different parameter settings for the Z feedback […]

Upgrade from pre 14.02 “Zurich Instruments HF2” LabVIEW Driver to “Zurich Instruments LabOne” LabVIEW Driver

on 05.05.2014 at 22:36 by Sadik on Blog of Sadik Hafizovic
With release the 14.02 of the Zurich Instruments LabOne software, the LabVIEW driver was reworked so that it is compatible with all Zurich Instruments products. At the same time it was renamed from “Zurich Instruments HF2” to “Zurich Instruments LabOne”. […]

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

on 26.02.2014 at 18:13 by James Wei on Blog of 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 […]