The Gamry Difference
When you purchase an instrument built by Gamry Instruments, Inc., you receive the finest electronics available in the field of electrochemistry. This article tells you about “the Gamry difference,” that is, what makes a Gamry Interface™ 1000 series potentiostat a Gamry.
Electrochemical measurements necessarily require multiple signal channels from the various electrodes in your cell or test equipment. Each of these signal channels ideally should not affect another channel, that is, the channels are isolated from one another. To solve this problem, Gamry Instruments uses only low-profile components, to drastically lower any electromagnetic interference, and places a conductive fence between channels.
For the best possible analog-to-digital resolution, Gamry Instruments starts with a 16-bit A/D converter. We add to this controllable noise filters to remove any noise in the channels. Then we run the signal through controllable amplifiers with a gain of up to ×100, which is nearly 27, or almost an extra 7 bits of resolution. When we add this gain to the A/D converter, we get an ultimate resolution of almost 23 bits that is noise-free!
The above graph is actual noise data from an Interface 1000 over time, taken with our signature Framework™ software, run on a 200 Ω resistor (potential 0.0 vs reference; IE range 1 µA full-scale; filters: 1 kHz, CA Speed Normal). Analysis gives a peak–peak current of 41.1 nA. With this 200 Ω resistor, we can calculate from Ohm’s law that peak–peak voltage is only 8.2 µV. Note that there is no power line (60 Hz) component.
In electronics, the frequency resolution ∂f can be defined as the inverse of the sampling time. For Gamry Instruments, with our 32-bit direct-digital synthesis clock, we boast a frequency resolution of 1/232. (For more information about frequency resolution, see our Application Note “Waveform Generation and Frequency Resolution”.
Only Surface-mounted Components
Gamry Instruments uses only surface-mounted electronic components in its potentiostats. Surface-mounted components mean a smaller volume, and less fluctuation in temperature, which gives you less drift and more accuracy when you take data.
No Cables, Harnesses, or Interconnects
The Interface 1000 contains no cables, harnesses, or interconnects inside its chassis. This means that the Interface 1000 has superior mechanical reliability (no connections to become loose), less stray EMF interference, and fewer chances for internal corrosion at contacts. Minimizing such metal-to-metal contacts provides our instruments with lower drift and overall better stability.
Low-noise Power Supply
Potentiostats made by Gamry Instruments use a low-noise primary switching power supply. This kind of power supply eliminates EMF interference with your desired signal. It is also a high-efficiency supply, which means there is less heat generated, and a greener usage-profile.
Specially Designed Chassis
Our potentiostats use a custom-designed chassis, created to optimize removal of heat and maintaining a constant temperature. The chassis includes a special guided airflow design to cool the electronics consistently. Even the chassis contributes to the Interface 1000 potentiostat’s low drift, high accuracy, and stable measurement conditions!
The computer-controlled variable-speed fan inside the chassis cools internal electronics. The fan is designed to keep a constant temperature. Fans, which are necessarily built with electric motors, create a small amount of electrical noise, so we at Gamry Instruments remove the fan from the proximity of sensitive components to avoid induced noise in your signal. In addition, a variable-speed fan is quieter, which is important in a busy laboratory environment.
To help protect the environment, all Gamry Instruments potentiostats are fully China RoHS-compliant, so you can be sure that the Interface 1000 is lead-free, mercury-free, and cadmium-free. Gamry Instruments potentiostats are contained within a recyclable aluminum chassis as well.
Given all the advantages listed for Gamry Instruments potentiostats, why would you choose another instrument for your electrochemical work?
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