Does the time of data measured on the DA100 depend on the PC?

Yes. The DA100 does not keep track of absolute time. When starting to acquire measured data using package software on a PC, the PC's time is set on the DA100. After that, time is managed based on the DA100's scan interval (relative time). Therefore the measurement time changes according to the PC's time. On the DC100, DR230, DR240, and DR130, time is controlled by a crystal transmitter inside the measuring instrument, and is not dependent on the PC.