Posts by James Wei

Express EIS Platform for Microfluidics

on 11.10.2013 at 14:07 by James Wei
This blog is aimed for those interested in knowing more about setting up an electrical impedance spectroscopy (EIS) based on a microfluidic setup. In 2012 Zurich Instruments joined forces with Fluigent and Micronit by proposing an Electrical Impedance Spectrosocpy platform (EISP) […]

Using HF2IS Impedance Spectroscope for FRA, 2-Terminal and 4-Terminal Measurements

on 19.09.2013 at 14:14 by James Wei
Often there are questions from our HF2IS Impedance Spectroscope users on how to configure the HF2IS for frequency response analysis (FRA), 2-Terminal impedance measurement, or 4-Terminal impedance measurement. This short blog will clarify the proper physical connections as well as […]

Guide to Tuning the HF2LI-PID Controllers

on 17.09.2013 at 10:54 by James Wei
On the Zurich Instruments website, there are a few advanced examples of using HF2LI-PID controllers in different feedback control applications. However, I often get questions from first time users on how to properly tune the PID gain parameters. I am […]

Remote Access to HF2 Instruments on the LAN

on 07.06.2013 at 08:56 by James Wei
As explained in the HF2 User Manual, users can configure in ziControl to connect to any ziServer host on the LAN i.e. remote client access to HF2 Instrument. This blog will sum up an easy two-steps procedure to do exactly […]

Optimize Your HF2TA Transimpedance Amplifier Settings

on 24.05.2013 at 11:43 by James Wei
Users of the HF2TA transimpedance amplifier should always be aware of the trade-off between the transimpedance gain and the 3-dB roll-off bandwidth of the amplifier. (Hint: Since the HF2 software release 12.08, the bandwidth is also specified in the HF2TA […]

Operate HF2LI dual-channel lock-in amplifier with one reference frequency

on 24.05.2013 at 11:43 by James Wei
This blog quickly described how to synchronize the lock-in reference for both lock-in channels of HF2LI lock-in amplifier. HF2LI lock-in amplifier comes with two independent lock-in channels which offers HF2LI users substantially more flexibility compared to the single lock-in setup. With […]

Optimize Your Frequency Sweep for Static Impedance Measurement

on 28.02.2013 at 08:20 by James Wei
Very often people want to measure very large static impedance (e.g. small capacitance, large resistance) over a wide frequency range. In the very low frequency region, one may notice that measured curve is not smooth but rather “jiggly”, just like […]

ω/2 Demodulation for a Parametric Oscillator

on 27.02.2013 at 10:04 by James Wei
We often get questions from HF2LI lock-in amplifier customers who characterize MEMS and sometimes from those doing AFM scans on how to measure at half reference frequency using a lock-in amplifier. Half reference frequency lock-in measurement is often necessary when […]

Arbitrary Input Scaling and Units in Lock-in Amplifiers

on 13.12.2012 at 11:01 by James Wei
Ever wonder how you can read your measurement data in ziControl in the unit that you want and not just in voltage? Do you know how you can take the gain or loss introduced outside your HF2 device into consideration […]

Generate Cole-Cole impedance plot using HF2IS Impedance Spectroscope

on 11.12.2012 at 08:36 by James Wei
In the version of ziControl prior  to 12.08, our HF2IS Impedance Spectroscope customers could only observe the impedance measured through post-processing: one had to save the measurement X, Y data onto the PC, calculate the voltage and current quantity and […]