Hi Peter
Big problem small low cost EIS! I needed several unit (apx 5 units) for some work/test I am conducting and found out that they are very costly and not so portable. However, I perused and found a device that can be used with very little hardware - but you may need to get some electronics help. The device is the Analog Devices' AD8302.
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They also do a demo board that is apx $100. The device is a 2.7GHz RF / IF Gain Phase Detector. This device will work down to 0.001Hz (and upto 2.7GHz) but you will need to switch in some large capacitors. The input impedance of the device is fix at 51R but can be safely adjusted to apx 500R. However, using an opamp in unity gain configuration can give input impedances of apx 1GR.
I have build several of these and they seem to work well. As far as connecting them to a computer any cheap ADC unit such as the Picotech
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devices prices at apx $100 Whilst this is a project rather than a turnkey solution it will save you some money.
Let me know if you require any further info.
Wayne
I am looking for a portable potentiostat that would interface with a
> laptop that would do Electrochemical Impedance Spectroscopy. Gamry is
> offering an inclosure box which makes their potentiostat portable, but
> this unit costs more than I would like to spend and offers more than I
> really need. The reality of it is that all I need to do in the field
> is EIS measurements, and not the other electrochemical methods. Do any
> of you know of any units that would serve this purpose at a reasonable
> price? Thank You.
>