Hi everyone,
I am trying to read temperatures using two Keithley 2701 multimeters and LabVIEW 2010, using Ethernet as interface. The data from the sensors is obtained via a 7702 Keithley multiplexer module, and the configuration used is a 4-wire RTD. The application needs to read 20 channels per multimeter simultaneously, but the two Keithleys seem to be always out of sync; while sometimes they do synchronize, it seems like a random phenomenon. Here is a screenshot of a stripped-down version of the real program, with only one meter, and one channel read. The basic principle in the main program is the same as this one: initializing first, then entering a while loop with a variable sampling time and writing the measurement. In the main program, the two Keithleys are entering the same way in the while loop, with no additional case-structures to separate them. The problem does not only show in the computer, but the actual Keithley meters are not reading at the same time, as can be seen in the instrument's display. Altering the sampling time only makes things much slower and still out of sync.
Is anybody experiencing any similar issues?
