01-23-2014 11:39 PM
01-24-2014 03:00 AM
Hi Zhu,
the Keithley DMMs allow faster sampling when using their internal data buffer! There are special commands to configure that buffer and to fetch data from it.
It's all described in the K2000 manual, you only need to read it…
When it comes to aquiring 6 signals in different units (V, A, Ohm) the K2000 needs to switch inputs (do you have a multiplexer card built in?) and signal amplifier too. Both actions need their time (which is specified in the manual) and both actions will reduce your maximum sampling rate!
01-24-2014 07:05 AM
@AndrewZhu wrote:In my actual experiment, it may require up to 6 input signal, e.g.,Volt, current, or resistance, simultaneously .
I would recommend going to a DAQ card then. You will need to do some circuitry to get all of those types of measurements, but it shouldn't be anything major. And then you can sample a lot faster than the Keithley 2000 and have the data logged straight to disk as a TDMS file.