LC4 Data Logger Manual
The LC4 Data Logger stores data in a comma separated value (CSV) file. The file name is based upon the date and time, for example: LC4-20211201-090809.txt. This file was created for an exposure that started at 9 seconds past 09:08 on the 1st December 2021. If the data logger has no battery, then when the light integrator is switched on the date and time are set to 00:00:00 on the 1st January 2000. This would produce a file name something like the following: LC4-20000101-000034.txt.
The start of the file contains configuration information. The data fields are:
- Date and time
- Total exposure in thousandths of a unit
- Most recent light sensor reading in units per second
- Temperature, if a temperature or environment sensor is installed, otherwise 0
- Humidity, if an environment sensor is installed, otherwise 0
Note that depending on your system configuration the exposure data may be UV light from one or more sensors, or visible light.
Here is an extract from a 5 minute exposure. Note that at the start there are several 0 readings. These happen when the light integrator is measuring an exposure, but the lights have not yet switched on.
2021/12/01 09:08:09,New File,/LC4-20211201-090809.txt
2021/12/01 09:08:09,UV Light
2021/12/01 09:08:09,Temperature Units,C
2021/12/01 09:08:09,Humidity Units,RH
2021/12/01 09:08:09,Date Format,Year
2021/12/01 09:08:09,Time Format,24 Hour
2021/12/01 09:08:09,Starting Automatic Exposure
2021/12/01 09:08:09,Program 1,0:05:00.0
2021/12/01 09:08:09,Exposure,0,0.0,units/s,0.0,units,17.0,C,0.0,RH
2021/12/01 09:08:10,Exposure,0,0.0,units/s,0.0,units,17.0,C,0.0,RH
2021/12/01 09:08:11,Exposure,0,0.4,units/s,0.4,units,17.0,C,0.0,RH
2021/12/01 09:08:12,Exposure,1000,0.5,units/s,0.9,units,17.0,C,0.0,RH
2021/12/01 09:08:13,Exposure,2000,0.5,units/s,1.3,units,17.0,C,0.0,RH
2021/12/01 09:08:14,Exposure,3000,0.4,units/s,1.8,units,17.0,C,0.0,RH
2021/12/01 09:08:15,Exposure,4000,0.4,units/s,2.2,units,17.0,C,0.0,RH
2021/12/01 09:08:16,Exposure,5007,0.5,units/s,2.7,units,17.0,C,0.0,RH
2021/12/01 09:08:17,Exposure,6017,0.5,units/s,3.2,units,17.0,C,0.0,RH
2021/12/01 09:08:18,Exposure,7027,0.5,units/s,3.6,units,17.0,C,0.0,RH
2021/12/01 09:08:19,Exposure,8037,0.5,units/s,4.1,units,17.0,C,0.0,RH
2021/12/01 09:08:20,Exposure,9047,0.5,units/s,4.6,units,17.0,C,0.0,RH
2021/12/01 09:08:21,Exposure,10057,0.5,units/s,5.0,units,17.0,C,0.0,RH
2021/12/01 09:08:22,Exposure,11067,0.5,units/s,5.5,units,17.0,C,0.0,RH
...
...
...
2021/12/01 09:13:03,Exposure,291847,1.0,units/s,244.1,units,17.0,C,0.0,RH
2021/12/01 09:13:04,Exposure,292857,1.0,units/s,245.1,units,17.0,C,0.0,RH
2021/12/01 09:13:05,Exposure,293867,1.0,units/s,246.1,units,17.0,C,0.0,RH
2021/12/01 09:13:06,Exposure,294877,1.0,units/s,247.2,units,17.0,C,0.0,RH
2021/12/01 09:13:07,Exposure,295887,1.0,units/s,248.2,units,17.0,C,0.0,RH
2021/12/01 09:13:08,Exposure,296897,1.0,units/s,249.2,units,17.0,C,0.0,RH
2021/12/01 09:13:09,Exposure,297907,1.0,units/s,250.2,units,17.0,C,0.0,RH
2021/12/01 09:13:10,Exposure,298917,1.0,units/s,251.2,units,17.0,C,0.0,RH
2021/12/01 09:13:11,Exposure,299927,1.0,units/s,252.2,units,17.0,C,0.0,RH
2021/12/01 09:13:12,Exposure,300937,1.0,units/s,253.2,units,17.0,C,0.0,RH
2021/12/01 09:13:12,Exposure Completed
2021/12/01 09:13:12,Finished
If the exposure is interrupted, then this is recorded in the file.
Here is a file extract from an exposure that was paused and restarted:
2021/12/01 09:24:12,Exposure,88836,0.8,units/s,60.1,units,18.2,C,0.0,RH
2021/12/01 09:24:13,Exposure,89846,0.8,units/s,60.9,units,18.2,C,0.0,RH
2021/12/01 09:24:13,Automatic Exposure Paused
2021/12/01 09:24:21,Automatic Exposure Resumed
2021/12/01 09:24:21,Exposure,89947,0.0,units/s,60.9,units,18.2,C,0.0,RH
2021/12/01 09:24:22,Exposure,90947,0.0,units/s,60.9,units,18.2,C,0.0,RH
Here is a file extract from an exposure that was stopped:
2021/12/01 09:28:07,Exposure,8081,1.0,units/s,8.6,units,18.8,C,0.0,RH
2021/12/01 09:28:08,Exposure,9091,1.0,units/s,9.6,units,18.8,C,0.0,RH
2021/12/01 09:28:09,Automatic Exposure Paused
2021/12/01 09:28:10,Automatic Exposure Cancelled
2021/12/01 09:28:10,Finished
If a program is used to manage the exposure, then this is also recorded in the file. Here are the data from a short program:
2021/12/01 09:28:51,New File,/LC4-20211201-092851.txt
2021/12/01 09:28:51,UV Light
2021/12/01 09:28:51,Temperature Units,C
2021/12/01 09:28:51,Humidity Units,RH
2021/12/01 09:28:51,Date Format,Year
2021/12/01 09:28:51,Time Format,24 Hour
2021/12/01 09:28:51,Starting Automatic Exposure
2021/12/01 09:28:51,Program 1,10.0
2021/12/01 09:28:51,Program 2,14.1
2021/12/01 09:28:51,Program 3,20.0
2021/12/01 09:28:51,Program 4,28.3
2021/12/01 09:28:51,Program 5,40.0
2021/12/01 09:28:51,Exposure,0,0.0,units/s,0.0,units,18.9,C,0.0,RH
2021/12/01 09:28:52,Exposure,0,0.0,units/s,0.0,units,18.9,C,0.0,RH
2021/12/01 09:28:53,Exposure,0,0.2,units/s,0.2,units,18.9,C,0.0,RH
2021/12/01 09:28:54,Exposure,1006,1.0,units/s,1.2,units,18.9,C,0.0,RH
2021/12/01 09:28:55,Exposure,2016,1.0,units/s,2.1,units,18.9,C,0.0,RH
2021/12/01 09:28:56,Exposure,3026,1.0,units/s,3.1,units,18.9,C,0.0,RH
2021/12/01 09:28:57,Exposure,4036,1.0,units/s,4.1,units,18.9,C,0.0,RH
2021/12/01 09:28:58,Exposure,5046,1.0,units/s,5.0,units,18.9,C,0.0,RH
2021/12/01 09:28:59,Exposure,6056,1.0,units/s,6.0,units,18.9,C,0.0,RH
2021/12/01 09:29:00,Exposure,7066,1.0,units/s,7.0,units,18.9,C,0.0,RH
2021/12/01 09:29:01,Exposure,8076,1.0,units/s,7.9,units,18.9,C,0.0,RH
2021/12/01 09:29:02,Exposure,9086,1.0,units/s,8.9,units,18.9,C,0.0,RH
2021/12/01 09:29:03,Exposure,10096,1.0,units/s,9.9,units,18.9,C,0.0,RH
2021/12/01 09:29:04,Exposure,11106,1.0,units/s,10.9,units,18.9,C,0.0,RH
2021/12/01 09:29:04,Program, Continue to next exposure
2021/12/01 09:29:05,Exposure,12117,1.0,units/s,11.8,units,18.9,C,0.0,RH
2021/12/01 09:29:06,Exposure,13127,1.0,units/s,12.8,units,18.9,C,0.0,RH
2021/12/01 09:29:07,Exposure,14137,1.0,units/s,13.8,units,18.9,C,0.0,RH
2021/12/01 09:29:08,Exposure,15147,1.0,units/s,14.8,units,18.9,C,0.0,RH
2021/12/01 09:29:09,Program, Continue to next exposure
2021/12/01 09:29:09,Exposure,16157,1.0,units/s,15.7,units,18.9,C,0.0,RH
2021/12/01 09:29:10,Exposure,17167,1.0,units/s,16.7,units,18.9,C,0.0,RH
2021/12/01 09:29:11,Exposure,18177,1.0,units/s,17.7,units,18.9,C,0.0,RH
2021/12/01 09:29:13,Exposure,19187,1.0,units/s,18.7,units,18.9,C,0.0,RH
2021/12/01 09:29:14,Exposure,20197,1.0,units/s,19.7,units,18.9,C,0.0,RH
2021/12/01 09:29:15,Exposure,21207,1.0,units/s,20.6,units,18.9,C,0.0,RH
2021/12/01 09:29:15,Program, Continue to next exposure
2021/12/01 09:29:16,Exposure,22217,1.0,units/s,21.6,units,18.9,C,0.0,RH
2021/12/01 09:29:17,Exposure,23227,1.0,units/s,22.6,units,18.9,C,0.0,RH
2021/12/01 09:29:18,Exposure,24237,1.0,units/s,23.6,units,18.9,C,0.0,RH
2021/12/01 09:29:19,Exposure,25247,1.0,units/s,24.6,units,18.9,C,0.0,RH
2021/12/01 09:29:20,Exposure,26257,1.0,units/s,25.6,units,18.9,C,0.0,RH
2021/12/01 09:29:21,Exposure,27267,1.0,units/s,26.6,units,18.9,C,0.0,RH
2021/12/01 09:29:22,Exposure,28277,1.0,units/s,27.6,units,18.9,C,0.0,RH
2021/12/01 09:29:23,Exposure,29287,1.0,units/s,28.6,units,18.9,C,0.0,RH
2021/12/01 09:29:23,Program, Continue to next exposure
2021/12/01 09:29:24,Exposure,30296,1.0,units/s,29.5,units,18.9,C,0.0,RH
2021/12/01 09:29:25,Exposure,31306,1.0,units/s,30.5,units,18.9,C,0.0,RH
2021/12/01 09:29:26,Exposure,32316,1.0,units/s,31.5,units,18.9,C,0.0,RH
2021/12/01 09:29:27,Exposure,33326,1.0,units/s,32.5,units,18.9,C,0.0,RH
2021/12/01 09:29:28,Exposure,34336,1.0,units/s,33.5,units,18.9,C,0.0,RH
2021/12/01 09:29:29,Exposure,35346,1.0,units/s,34.5,units,18.9,C,0.0,RH
2021/12/01 09:29:30,Exposure,36356,1.0,units/s,35.5,units,18.9,C,0.0,RH
2021/12/01 09:29:31,Exposure,37366,1.0,units/s,36.5,units,18.9,C,0.0,RH
2021/12/01 09:29:32,Exposure,38376,1.0,units/s,37.5,units,18.9,C,0.0,RH
2021/12/01 09:29:33,Exposure,39386,1.0,units/s,38.5,units,18.9,C,0.0,RH
2021/12/01 09:29:34,Exposure,40396,1.0,units/s,39.5,units,18.9,C,0.0,RH
2021/12/01 09:29:35,Exposure,41406,1.0,units/s,40.5,units,18.9,C,0.0,RH
2021/12/01 09:29:35,Exposure Completed
2021/12/01 09:29:35,Finished
The file can be imported into a spreadsheet for analysis and troubleshooting.
The following chart was produced using Microsoft Excel.
