I am using Keithley-2460 for source voltage sweep and measure current (USB connection is used). I wanted to get the voltage versus current plot for a 200 ohm resistor. I have modified an example code for getting voltage, current wave forms. This one was for keithley-2450. I hope its okay to be used for 2460. I am using a two wired connection and I am getting an error of "No readings exist within buffer" for both example code and modified code. I have tried different ways like changing the compliance level, waiting time for operation complete etc. and could not solve it. Keithley is showing V-I plot correctly in its monitor. I was able to get the V-I plot with correct current values by using a very high resistor 10 mega Ohm, but while using 200 ohm or resistors in k Ohms I am getting error. It seems like low impedance values have the problem.I am attaching both codes, the videos of running the code and images of set up ( can be seen from the google drive link https://drive.google.com/drive/folders/1D9cprtQbB2EVrqoAErE7YAgbRKjTlKxd?usp=sharing). Please have a look at it. In the original code and modified one I am facing the same error.