I've bought an AD5933 evaluation board and am looking to do some characterization of biological samples. For this, I would like to connect some sample probes to the input and output pin but I have no idea what factors I should take into consideration when selecting these probes. Can I just weld them to the input and output pins or are there some recommended connectors?
Is this the version of the board you are using: https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/eval-ad5933.html? If so, then you can see wire push-in connectors marked "RFB" and "Z" for you to connect RFB resistor and the impedance Z to be measured respectively by by pushing the resistor leads and the wires from your sample (and calibration impedance) into the sockets.
Regarding selection of the probes - it is hard to recommend anything w/o at least some info as to what you are trying to measure. Usually the consideration might include such factors as the impedance range of you samples, frequency and voltage ranges at which you plan to operate and the nature of the sample, like the voltage/current at which if dies, etc.