Hi Wouter,
Have you a compatible LabVIEW driver for your Tektronix instrument? Because the reason could be the following : you are calling some steps to your instrument and LabVIEW can't convert some specific steps from SignalExpress because the equivalent function can't be found in LabVIEW.
You can found the tektronix instrument driver at
this page.
Regards,
Julien Roland - District Sales Manager
NI Belgium - Technical Support
Don't forget to rate a good answer