The SCB68 is not a DAQ card. It is a connection block. What DAQ card do you have? The connector you have is called a BNC type. I am using a PCB accelerometer, with their signal conditioner, into a PCI-6221 DAQ card. I use Labview to view and datalog vibration.
You can read back the log file and put the data into Labview. Is that program really writing to a native Excel file, or to a .csv or .txt file that can be read by Excel. If it is a true Excel file, you won't be able to read and write to it at the same time. If it is not, then you should be able to. You may want to check the RT Pro tech support to see if they have an ActiveX library, or there is a dll librart that you can use to access the signal analyzer from Labview.