Hello Silviuks.
Please refer to the following link for information regarding how to configure your system to use a mobile device in conjunction with a 4050 DMM.
Build a Bluetooth Enabled PDA Digital Multimeter with LabVIEW PDA
If you refer to Step 1 on this webpage, there is a downloadable driver for the 4050 which works with the LabVIEW PDA module.
If you refer to Step 4 on this webpage, there are example programs that can be downloaded that could help you get started.
While a 4050 coupled with a LabVIEW PDA module running on Pocket PC 2002 works, we have not documented any tests on Win CE 3.0. However, the examples in step 4 could provide you a means to test your setup.
Also, could you please provide more specifics on what kind of DAP Technologies device it is. A model number would help us explore this issue further. Good luck on your application and if you have any more questions, please let us know.
Have a great day!
Brian F
Applications Engineer
National Instruments