To understand the readings obtained from a data logger program, it is necessary to see how the TDR100 operates in PC-TDR. Either the TDR100 commands are entered in PC-TDR and the user waits to see the results, or the data logger sends the TDR100 commands and automatically stores the results.
Campbell Scientific suggests initially entering the TDR100 commands in PC-TDR and waiting for the results before writing a data logger program. This allows verification that the TDR100 is operating correctly in PC-TDR. After that has been verified, a data logger program can be created for the TDR100 that sends the commands and stores the results.