PCI-6014 - What is the clock source for the timer?

[amylam]

I am using a PCI-6014 card with LabView 7.0 and an XP operating system. I'd like to calculate the time resolution that I can get with the 24-bit timer. What is the clock source using this software and this card?

[Spencer S.]

Amylam,

When performing a time measurement with the PCI-6014, the resolution is dictated by the signal being used as the source of the counter. Most often, one of the internal timebases is used as the source. The two available internal timebases for the PCI-6014 are 100 kHz and 20 MHz. Thus, the highest resolution would be achieved with the 20 MHz timebase. However, this timebase will also cause the 24-bit counter to reach terminal count in the least amount of time. Thus, the duration of the measurement will be less than when the 100 kHz timebase is used.

In LabVIEW 7.0, you should examine the Count Time-Easy (DAQ-STC).vi example. It is available in the following location:

Examples >> Hardware Input and Output >> Traditional DAQ >> Counte
rs >> DAQ-STC

Good luck with your application.

Spencer S.