Hi mullenc525,
You can do both of these tasks from LabVIEW SignalExpress with the USB 6211.
To create a 60Hz square wave, you can use one of the counters on the 6211 and the counter output step in LabVIEW SignalExpress.
As for converting voltage to physical quantities, LabVIEW SignalExpress has scaling for the most common types of measurements as well as the built in functionality to create custom conversions.
Regards,
Matt F