Precision Measurement Engineering, Inc.
(760) 727-0300
www.pme.com
7
miniDOT Logger to record at different intervals. This is accomplished by running the
miniDOTControl.jar program supplied with the miniDOT Logger. Recording intervals must
be 1 or more minutes and must be less than or equal to 60 minutes. Intervals outside this
range will be rejected by the miniDOTControl program. (Contact PME for other recording
intervals.)
Please refer to Chapter 2 for instructions on operating the miniDOTControl program.
Time
– All miniDOT Logger times are UTC (formerly known as Greenwich mean time
(GMT)). The miniDOT Logger internal clock will drift in the <10 ppm range (< about 30
seconds/month) so you should plan to connect it occasionally to a HOST computer having an
Internet connection. The miniDOTControl program will automatically set time based on an
Internet time server.
Please refer to Chapter 2 for instructions on operating the miniDOTControl program.
File Information
– The miniDOT Logger software creates 1 file daily on the miniDOT
Logger’s internal SD card. The number of measurements in each file will depend upon the
sample interval. Files are named by the time of the first measurement within the file based
on the miniDOT Logger’s internal clock and expressed in YYYY-MM-DD HHMMSSZ.txt
format. For example a file having the first measurement on September 9, 2014 at 17:39:00
UTC will be named
2014-09-09 173900Z.txt.
Files can be uploaded from the miniDOT Logger by connecting it to a HOST computer. Use
the HOST computer’s copy/paste functions to move the files from the miniDOT Logger to the
HOST computer.
Each measurement within the files has a time stamp. The time stamp format is Unix Epoch
1970, the number of seconds that have passed since the first moment of 1970. This may be
inconvenient in some cases. If so, then the miniDOTConcatenate program not only
concatenates all the measurement files, but also adds more readable statements of the time
stamp.
Please refer to Chapter 2 for instructions on operating the miniDOTConcatenate program.
The miniDOT Logger requires time and battery energy to work through the file directory on
the SD card to allocate new file space. A few hundred files on the SD card is not a problem,
but as the number of files grows large into the thousands then the miniDOT Logger may
suffer decreased battery life or other performance problems. Please, at the earliest
convenient time, copy the recorded files to a HOST computer and delete them from miniDOT
Logger’s SD card. Also, do not use miniDOT Logger to store files unrelated to the miniDOT
Logger’s operation.
