If you recently purchased a Gamry Interface 1000 Potentiostat and are experiencing a problem connecting it to a computer, your computer may have the Intel USB 3.0 eXtensible Host Controller driver installed. Please read on for some background and workaround.
Advanced Technical Topics
Beyond Basic Setup
Occasionally a Reference or Interface potentiostat will be plugged into a computer’s USB port and will not be detected. Initially this may lead one to believe the USB communications on the instrument may have failed, and a repair is necessary. However, it may be due to a computer setting known as “USB Selective Suspend Feature”, which may be turned on as a power saving setting in Windows. It is recommended to take the following steps to help determine the source of the USB communications failure.
The flexibility of Gamry’s Framework software is largely due to its foundation built around the EXPLAIN scripting language. All of the experiments run in Framework are written in EXPLAIN and the source code is available to the user for modification. Working with the scripting language is not difficult, but some computer programming experience, and especially experience with object-oriented languages, will be most beneficial. The following documents can assist the user with making some basic modifications to the scripts. A comprehensive syntax guide is built into the Framework software under the Help resources.
The following steps should be taken if your TDC4 displays "tOPN" even with the probe connected.
A number of users bring potentiostats into the field and need a reliable source of short term power for experiments. All of our USB potentiostats run from 120V AC wall outlets, but with varying power requirements.
An AC power inverter is required to run the potentiostat from automotive or marine batteries. Gamry has not tested specific inverter products, but generally a unit that can supply 750 watts continuous will be able to run the instrument. Products by Tripp-Lite, such as those from the POWERVERTER Series are designed for heavy-duty operation connecting directly to an automotive battery. Marine batteries, however, are designed for deep cycle operation and are better suited for longer use of the potentiostat in the field. Always use the power transformer block and cable that came with your USB instrument. Damage could result from connecting any power source directly to the back of the potentiostat.
The signal optimization step of the OptiEIS experiments can take (at a minimum) as long as 2 cycles of the minimum frequency entered during setup. During this step the current measurement range of the potentiostat is selected based on the amplitude of the signal. The "Max Current" box of the setup screen determines the initial current measurement range used during optimization. The optimization can take much longer, by multiple attempts at signal optimization, if the Max Current is too low, as it has to switch to the next range up and reattempt. The best method is to make an educated guess of the maximum current value with some knowledge of the impedance of the sample.
The Sequence Wizard includes steps to produce many of the same experiments that you can access from the main Experiment menu.
Experimental steps can be sequenced together using the sequence wizard, including digital out events to trigger external equipment. However, there is a small amount of setup gamry sequence wizardlag time between the end of one sequence step and the start of the next.