I am conducting a few experiments in which i need to record data in robust way as signals are not only very weak but valuse change robustly. What i need to measure is the electrical resistance in a nanocomposite sample as result of change in current or due to change of temperature.
What we did in our lab, is to use Keithley 2636A, write either Labview or Matlab program to record the current and voltage signals. The current signal can be as small as 50 fA. If your current is larger than that any Keithley 2636A or newer models can do this. The collecting frequency is based on the instrument specs, mostly 100 us.
Thanks @ Xing Zhang.......Can you please send me the code and some information reagrding matlab programme. I have Thurlby thunder multimeter 1604 and and keithly 1906. so , can you advice me for such meters ..............thanks alot
Of course. First off, you need to know what communication protocol the instrument talks to the computer. If you wanna use the Matlab code you need to connect the instrument using ethernet cable. If it is GPIB or Serial COM you would have to change the code accordingly, depending on what VISA resource that is. Second, the code is just simply a function, you have to type in your command into the terminal to be able to read stuff from it. This function applies voltage sweep from one channel and forcing the voltage to be zero from the other channel and measure the current from that exact channel. If you want to do some stuff other than this, you have to modify this code accordingly as well.
Personally I have never worked with Thurlby multimeter. And I can't seem to find Keithley 1906 (I don't think they sell this....)check 2400 maybe?
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