02-13-2020 07:06 PM
I ran both of the following examples:
NI-DCPower Hardware-Timed Voltage Sweep
NI-DCPower Software-Timed Voltage Sweep
on my PXIe-4141 SMU with the Source Delay set to 0.
I captured the voltage sweep on an a scope. I was surprised to find out that BOTH examples produced a staircase voltage ramp with the same delay between each step of about 17ms. I expected the HW-timed sequence to be much faster than the SW-timed sequence. (see attached screenshot)
How do you explain this observation?
02-13-2020 10:13 PM
Hi, AJ3D. Here's another forum post that I think answers your question:
And here's a list of attribute defaults for the PXIe-4140/41 http://zone.ni.com/reference/en-XX/help/370736U-01/nidcpowercref/supportedattributes4140_4141/ . 0.016...67 seconds shows up on a couple of different rows: aperture time and source delay. You minimized only one of those.
02-14-2020 12:48 PM - edited 02-14-2020 12:52 PM
I learn something everyday.
However, I expected the SW-timed sequence to be slower than the HW-timed due to the overhead of CUP-to-SMU communication after each measurement step.
02-14-2020 05:28 PM - edited 02-14-2020 05:29 PM
> However, I expected the SW-timed sequence to be slower than the HW-timed due to the overhead of CUP-to-SMU communication after each measurement step.