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Summary of Contents for Gulf Coast Data Concepts X16-1E
- Page 1 X16-1E USB Accelerometer Data Logger User Manual...
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Page 2: Table Of Contents
Table of Contents 1 Introduction............................1 About This Manual........................1 Document Conventions......................1 Appendix..........................1 Product Summary........................2 Feature List..........................2 Items Included with X16-1E....................3 1.6.1 Single Unit Purchase......................3 1.6.2 5 Unit Kit...........................3 Component Names........................4 Quick Start Guide........................5 2 Operation..............................8 USB Interface...........................8 Memory Card...........................8 Battery............................8 Setting The RTC........................10 Status Indicators........................11... - Page 3 Figure 1: X16-1E Data Logger........................2 Figure 2: X16-1E and Accessories......................3 Figure 3: 5 Unit Kit of Loggers.........................3 Figure 4: X16-1E Data Logger Components.....................4 Figure 5: Exploded View of the X16-1E....................4 Figure 6: Installing Battery........................5 Figure 7: Connecting to PC........................5 Figure 8: Editing Config.txt File........................6 Figure 9: Starting the X16-1E........................7...
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Page 4: Introduction
(page 22). Document Conventions The quick start guide in section 1.8 provides a basic summary of operation to begin using the X16-1E data logger. This user manual continues into further details of configurations and capabilities starting in section 2. -
Page 5: Product Summary
3-axis accelerometer sensor is time stamped using a real time clock and stored to a microSD card in simple text format. When connected via the USB to a personal computer, the X16-1E appears as a standard mass storage device containing the comma delimited data files and the user setup file. The X16-1E is powered from a replaceable AA type alkaline battery (or LR6). -
Page 6: Items Included With X16-1E
Items Included with X16-1E 1.6.1 Single Unit Purchase The X16-1E is packaged with the logger, a USB extender cable, a screwdriver, and an AA alkaline battery. Figure 2: X16-1E and Accessories 1.6.2 5 Unit Kit A kit includes 5 X16-1E loggers, a USB extender cable, and a screwdriver. Batteries are not included with kits. -
Page 7: Component Names
MicroSD card (under circuit board) 0.75" Length # 6-32 M achine Screw PCB Enclosure (Top) Printed Circuit Board PCB Enclosure (Cap) PCB Enclosure (Bottom) # 6-32 Hex Nut Figure 5: Exploded View of the X16-1E Gulf Coast Data Concepts Page 4 X16-1E, Rev New... -
Page 8: Quick Start Guide
Quick Start Guide The X16-1E is a simple, economical solution to capture continuous motion data and quickly deliver the information for analysis. The following instructions outline the steps to begin using the X16-1E. Configuration settings and mounting methods will depend on the particular application. -
Page 9: Figure 8: Editing Config.txt File
Step 3: Configure the X16-1E by editing the appropriate tags in the config.txt file using a simple text editor. In Windows, do not use Notepad, as the editor does not terminate new lines properly. GCDC recommends Windows Wordpad or Notepad++ to edit the config.txt file. -
Page 10: Figure 9: Starting The X16-1E
To stop recording, press and hold the button for about 3 seconds. The red and blue LEDs will begin to blink rapidly for 2 seconds and then turn off. Release the button and the X16-1E turns off. Pressing the button again restarts the logger, and data is recorded to a new file. -
Page 11: Operation
(ANSI type 15A or IEC type LR6) or lithium battery (ANSI type 15L or IEC FR6) to operate the X16-1E. The battery is not used when the device is connected to a computer USB port. The X16-1E will log constantly for approximately 50 hours at 50 Hz and approximately 29 hours at 100 Hz when using a standard alkaline AA battery. -
Page 12: Figure 11: Expected Battery Life
(-40°C – 60°C) and about 30% more capacity over a standard alkaline battery. The X16-1E will not operate from an external 5v USB power supply, unlike previous versions of this logger. Extending the operating time is only achieved with larger battery capacity added directly to the AA battery terminals. -
Page 13: Setting The Rtc
Setting The RTC A real time clock (RTC) integrated into the X16-1E determines the time for each line of data recorded. The RTC is initialized using a user-created text file named “time.txt” that is loaded by the logger upon booting. The time file method of setting the RTC does not require special communication drivers, so it can be implemented using a simple text editor. -
Page 14: Status Indicators
System Configuration Options The X16-1E is configured using a set of tags and settings stored in a text file named “config.txt”, which is located in the root directory of the microSD card. The system reads the configuration file at boot time. -
Page 15: Absolutetime
“epoch” or Unix time 0. 2.6.2 deadBand “deadBand” defines the minimum difference between recorded sensor readings. A new sample from the accelerometer sensor must exceed the previous recorded reading before the logger records the data. Gulf Coast Data Concepts Page 12 X16-1E, Rev New... -
Page 16: Deadbandtimeout
The deadBand threshold event occurs when a sensor reading exceeds the last recorded value by the deadBand setting. A valid dwell setting is an integer between 0 and 65535. See section 2.7.2 for an example implementation of the deadBand/dwell features. Gulf Coast Data Concepts Page 13 X16-1E, Rev New... -
Page 17: Filename
2.6.8 rebootOnDisconnect The X16-1E incorporates an on/off button for initiating and terminating the data recording process. Data recording is automatically started upon disconnect from a computer USB port if the tag word “rebootOnDisconnect” is included in the configuration file. -
Page 18: 2.6.10 Samplerate
Each data file is 90,000 lines long, which is 15 minutes of data. The status indicators are set to high brightness. The logger is activated with the on/off button (notice “rebootondisconnect” is not active). Gulf Coast Data Concepts Page 15 X16-1E, Rev New... -
Page 19: Example B
The deadband and dwell settings configure the device to record at least 5 seconds of data when a change greater than 0.1g is detected. The deadbandtimeout setting forces a sample write every hour. ; Example X16-1E Config file ; set to 25Hz samplerate = 25 ;... -
Page 20: Data Interpretation
Data Interpretation Data Files The X16-1E creates a new data file when the system is booted or when the maximum number of data lines is reached in the previous data file. A system boot condition occurs when the on/off button is pressed or when the X16-1E is removed from a computer USB port with the “rebootondisconnect”... -
Page 21: Data Conversion
Epoch, which is January 1, 1970. Programs such as Matlab, Octave, and R will directly import this time stamp format and automatically convert it to a standard date and time format. Gulf Coast Data Concepts Page 18... -
Page 22: Acceleration
The sensor's clock precision and drift are undefined. For example, a selected sample rate of 50 Hz may actually push data at 52 Hz. The X16-1E incorporates a precise real time clock to independently time stamp the data as it leaves the sensor and to ensure that accurate timing is recorded to the data file. -
Page 23: Sensor Special Features
13-bit resolution to the 16-bit data recorded in the data file. The X16-1E will support sample rates of 800, 1600, and 3200 Hz but the X16-1E deactivates the oversampling and FIR filter and records the native 13-bit resolution from the sensor. However, these sample rates are not guaranteed. -
Page 24: Operating And Storage Conditions
The X16-1E electronics are enclosed in a three-part semi-transparent blue plastic enclosure. The top and bottom enclosure components and the printed circuit board are secured together with a 0.75” long #6-32 screw and nut. A slip-on cap protects the USB connector. The X16-1E weighs 2oz (55g) with an alkaline battery. -
Page 25: Troubleshooting
400 Hz or less. Re-install the microSD card. Pull and replace the battery to reset the system. Press the on/off button, and the logger will return to normal operation. Gulf Coast Data Concepts Page 22 X16-1E, Rev New... - Page 26 A 3-axis tumble calibration test is the best method to determine the sensor offset error. The errors are particular to the sensor and are normally consistent throughout all data sets. Gulf Coast Data Concepts Page 23 X16-1E, Rev New...
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Page 27: Appendix
“fingers” changes. The change in electrical capacitance between the fingers is proportional to the displacement of the spring-mass system. The capacitance is measured, filtered, and converted to a digital output representing acceleration. Gulf Coast Data Concepts Page 24 X16-1E, Rev New... -
Page 28: Figure 24: Simplified Mems Accelerometer Design (L) And Actual Mems Accelerometer (R)
3D motion. This combination of sensors is considered an inertial measurement unit (IMU) system. Some IMU systems include an additional magnetometer sensor (compass) and GPS to further aid the calculations of motion. Gulf Coast Data Concepts Page 25 X16-1E, Rev New... -
Page 29: Using "R" To Analyze Data
Matlab with nearly all the same capabilities. However, Octave is a significantly larger download and more complicated installation than R. We favor R because it's small, easy to learn, and free. Figure 25: R Command Line Interface Gulf Coast Data Concepts Page 26 X16-1E, Rev New... -
Page 30: Introduction To R Commands
In the above example, 'a' was assigned the value '4' and can be used later. R works with vectors and matrices as well. > b<-c(1,2,3) ;”c” is a function call that creates a vector > b [1] 1 2 3 > a*b [1] 4 8 12 Gulf Coast Data Concepts Page 27 X16-1E, Rev New... -
Page 31: Online Resources For R
> fun(2,2) [1] 4 R will read a data file from the X16-1E data logger using the “read.table” function. > data<-read.table(“d:\\GCDC\\data-001.csv”, sep=”,”,comment=”;”, fill=TRUE) “data” is a matrix of 4 columns containing the time and Ax, Ay, and Az values from the file. Values within the matrix are accessed as follows: >... -
Page 32: Example Scripts In R
Several example applications using R scripts are available at the GCDC website or are included with the X16-1E data logger. These examples educate the user on basic operation of the data logger, interpretation of acceleration data, and the use of R scripts.
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