Measuring frequency using VC++ and PCI-2500 or USB-2500 series
MCC does provide a clear example using the cbCConfigScan and cbCInScan functions. Attached to this article (see below) is an VC++ 2008 example to measure frequency. This example should work with the following devices:
USB-2523
USB-2527
USB-2533
USB-2537
PCI-2511
PCI-2513
PCI-2515
PCI-2517
50 Hz square wave applied to counter 0