Multifunction Extended Life (MEL) Data Logger
The Multifunction Extended Life (MEL) data logger uses precise time stamped data logging, microSD memory storage, real-time data access and USB connectivity. Available with a 16g or a 2g accelerometer sensor. The additional GPS option provides location data and precision GPS time synchronization. The MEL data logger operates as a standard USB mass storage device containing the comma delimited text data files and user setup files. The commercial standard “D” batteries (IEC R20) provides extended life operation suitable to long term data acquisition applications.
Buy OnlineAccurate time stamped data using RTC disciplined to GPS time Data recorded to a removable microSD card Easily readable comma separated text data files Data transfer compatible with Windows or Linux via Universal Serial Bus (USB) interface (no special software) System appears as USB Mass Storage Device to Windows and Linux OS’s. Standard replaceable “D” type batteries (IEC R20) Weighs 500g (1.1lbs) with batteries Analog Devices ADXL345 3-axis 16-bit +/-16g digital accelerometer User selectable sample rate of 12, 25, 50, 100, 200 and 400 Hertz Analog Devices ADXL355 3-axis high performance 20-bit +/-2g accelerometer User selectable sample rates between 1 Hz and 1000Hz The GPS option adds location data and precision time alignment to the MEL-x16 or MEL-x2 u-Blox CAM-M8 GPS receiver module, compatible with GPS/Galileo, BeiDou, GLONASS systems Internal high gain patch antenna
MEL-x16 (16g Accelerometer)
MEL-x2 (2g Accelerometer)
+GPS Option
For more details, specifications, and how to use the MEL, please refer to the user manual (.pdf). The user manual includes an example data file and instructions for converting the data and time stamps.
The MEL logger is configured using a simple text file called config.txt located on the microSD card. Below is an example config.txt file used for the MEL-x2+GPS:
; PRODUCT_ID = X2-GPS
; sync'd sample rates 1 to 16 in integer increments
; adxl355 sample rates 3.9, 7.8, 15.6, 31.2, 62.5, 125, 250, 500, 1000
SampleRate = 5
gain= low
; GPS PARAMETERS
gpsOn = 1
; minimum hdop required, in meters
gps_MinLock = 40
;gps_update interval, in seconds
gps_sampleinterval = 1.000
; used in on/off mode number of good samples to collect before turning off
; 10 samples = 10 seconds which ensures a GPS time sync
gps_numSamples = 10
; used in on/off mode, time in seconds device will spend trying to collect good samples
; allow 5 min to find GPS location
gps_powerOnTime = 300
; used in on/off mode, time, in seconds bewteen on events
; check GPS once per day
gps_powerPeriod = 86400
; discipline RTC with GPS time
gps_clockThreshold = 0.010
; dynamic models 0-->portable 2-->stationary 3-->pedestran 4--> automotive, 5-->sea, 6,7,8-->airborn
gps_dynamicModel = 0
; when enabled, polled mode saves power at the expense of timing accuracy
gps_pollmode = 1
;gps_gnssGlonass = 0x01010001 ; enable
; disable Glonass
;gps_gnssGlonass = 0x01010000
; discard gps readings that exceed the minimum HDOP
gps_nobad
; extra parameters to logger operation
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; FILE PARAMETERS
;set file length to 1 day
samplesperfile = 86400
; custom directory name
;dirname = /DATA
; custom file prefix
filename = thz
; set timestamp to UTC seconds since Jan 1, 1970 instead of time since start of file
absoluteTime
; EVENT DETECTOR PARAMETERS
deadband = 0
DeadBandTimeout = 5
dwell=100
;control brightness of LEDs, values are 'off' or 'high'
statusindicators = high
;uncomment following line to activate logger upon disconnect from USB
;rebootOnDisconnect
; wakeupTime uses crontab format
; rtc alarm to wake up system
; wakeupTime = 5,35 wakes up system at 5 and 35 minute after the hour
; wakeupTime = 0,15,30,45 wakes up system
; wakeupTime = * wakes up system every minute
; wakeupTime = 0 2,8 wakes up system at 2 and 8 AM
;wakeupTime = 0,2,4,6,8,10,12,14,16
; default secsToRecord is 0 , (off)
;secsToRecord = 60
; logical, default is to remain turned on
;offOnEndRecord
;fileappend
Data is stored to simple text formatted .csv type files, which are easily imported into any spreadsheet or analysis software (Matlab, Octave, R, etc). Below is a example data file from the MEL-x16:
;Title, http://www.gcdataconcepts.com, X2-6, Analog Dev ADXL355, GPS
;Version, 2514, Build date, Jun 13 2023, SN:CCDC1021D5409E0
;Start_time, 2007-01-01, 00:01:05.341
;Uptime, 6,sec, Vbat, 2264, mv, EOL, 1800, mv
;Deadband, 0, counts
;DeadbandTimeout, 5.000,sec
;ADXL355, SR,1,Hz, Range, +/-2g, Hpf,off*Sr, Sens,256000,LSB/g (typ)
;BMP384, SI, 0.000,sec, Units, Pa, mdegC
;Alt Trigger disabled
;CAM_M8 Gps, SR,1,Hz
;Gps Sats, TOW, 1000, ver, 1, numSat, 0
;, gnssId, svId, cno, elev, azmith, prRes, flags,inUse
;Time, Ax, Ay, Az, TOW, Lat,Lon, Height(m), MSL(m), hdop(m), vdop(m)
1167609852.002731,226096,-88115,46925
1167609853.002830,205622,-102666,12432
1167609854.002929,212564,-5637,-152842
1167609855.003028,208580,-58474,-140828
1167609856.003127,206656,-59723,-145012
1167609857.003226,204354,-64773,-146860
1167609858.003266,227116,-115432,-8197, 411730.000, 30.2957220,-89.3669477, -69.409,-41.922, 27.478,141.470
1167609859.003357,206295,6643,-164325
1167609860.003448,208722,3772,-156107
1167609861.003539,212280,2343,-148518
1167609862.003630,214120,3556,-147563
1167609863.003721,207400,-58019,-143397
1167609864.003812,208934,-61975,-139738
1167609865.003903,208370,-59809,-140637
1167609866.003937,227615,28,-122988, 411738.000, 30.2957194,-89.3668899, -65.174,-37.687, 25.038,119.888
1167609867.004020,227281,2598,-123695
1167609868.004103,226128,2574,-125831
1167609869.004186,226615,-1186,-124719
- Over seas and long term freight monitoring
- Monitoring weather coniditions and events
- Longterm vibration monitoring of bridges and buildings
- Seismic monitoring