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I have been very successful using “island” ground planes on mixed signal (Analog & Digital) boards. I have been able to minimize digital noise showing up in the analog circuits with this technique. When I make these islands I am VERY conscious of the “loop” issues that Orgasmo has mentioned. I...

I have a question reguarding the use of a desktop pH meter, The meter I am using comes with a BNC cap that shorts out the input to the pH meter, but I have to remove the cap to use a pH electrode to make measurements, what is the cap used for? and when would I use it?

Sorry, Yahoo has some rules I did not follow try http://www.geocities.com/rakestraw69/ then click on the "schematic" link

Thanks Mr. dspDad; I believe my circuit topology is not the same as what you are talking about, you can see the input circuit at http://www.geocities.com/rakestraw69/Sch.PDF Our problem is that this circuit is specified to work with various transducers that spec impedance ranges from 20 meg...

You might look into a Time Domain Reflectometer (TDR). It is designed for a long length of cable, not a coil It may not work for your application but It's worth checking out.

I have been asked to measure the actual input impedance of an analog circuit that is designed to accept micro volts as the input which is directly fed into a high impedance op-amp buffer stage. The typical frequency at the input is about .1 HZ, so I am treating it as DC so I am thinking that I...

You can install a high pass filter in the signal path, I am not familiar with our industry, and the synchronous sampling is probably the simplest way to solve the issue, but a basic filter is fairly easy to build and install.

You might start at Sensors Magazine? see => http://www.sensorsmag.com/

I typed your part # "E13007-2" into google and came up with a hit on the Fairchild site, you can use the data sheet to choose a sub or just pursue the Fairchild part. http://www.fairchildsemi.com/pf/KS/KSE13007.html

Many times if the pot gets dirty and is not cleaned up reasonably soon the dirt will damage the pot. A 2 W pot is usually wire wound and is not as susceptible to this kind of damage. If you have many pots to test one of many viable test setups would be a 3 resistor voltage divider using the pot...