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Fields at Work ExpoM-ELF, User Manual

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Fields at Work ExpoM-ELF User Manual Download Page 13

Fields at Work GmbH, Sonneggstrasse 60, 8006 Zürich, Schweiz

 

2017 Fields at Work GmbH, Zurich  

ExpoM - ELF manual rev. 1.1

  

Page 13/19 

i 

The 

Data Logger

 options allow to choose which of the bands shall be measured during automatic 

data  logging.  The  selected  bands  are  all  measured  one  after  another  within  the  selected 
measurement  interval.  Please  note  that  the  minimum  recommended  measurement  interval  is 
higher when more than one band is selected (see 6.6). 

 

Figure 5: Device settings window 

When new measurement settings are saved to the device, the connected ExpoM - ELF device must 
be switched off and on again for the changes to take effect. 

 

Important Notice:

 The accuracy and reliability of the GPS localization depends on the environmental 

conditions. Inside buildings and homes GPS localization may not be possible. After switching on the 
device, the GPS receiver may take several minutes to search for satellites. No position data will be 
logged during this time. The first few GPS measurements can have reduced position accuracy. 

5.6.1

 

Firmware Update 

The firmware of ExpoM - ELF can be updated to improve its functionality and features. Firmware 
updates are published on our homepage and can be loaded to the device by the user. 

When a device is connected, the firmware updater can be started by clicking on the corresponding 
button on the bottom right of the device settings window. The update dialog will appear (Figure 6). 

Before applying the update, the connected ExpoM - ELF device must be put into update mode. This 
is achieved with following steps: Switch off the  ExpoM - ELF device and switch it on again while 
pressing the marker button. The multi-color LED will flash slowly with a bright color. The firmware 
update process consists of two steps. First, a valid update file must be selected. After that, the file 
can be transferred to the device. This step takes a few seconds to complete. When the update is 
successfully terminated, the ExpoM - ELF device must be restarted using the ON/OFF switch. The 
updated firmware is now active. 

Summary of Contents for ExpoM-ELF

Page 1: ...ExpoM ELF User Manual Version 1 1 ...

Page 2: ...2 Over Discharge Protection Automatic Shutdown 7 5 ExpoM ELF Utility PC Software 8 5 1 General Information 8 5 2 The Main Window 8 5 2 1 Device Connection 1 8 5 2 2 Measurement Data Section 2 9 5 2 3 Device and Application Settings 3 9 5 2 4 Manual Data Acquisition 4 9 5 2 5 Time Line Device Status Plots 5 9 5 2 6 Spectrum Time Domain Single Measurement Analysis Plot 6 9 5 2 7 Time Line Navigation...

Page 3: ...ngs 12 5 6 1 Firmware Update 13 5 7 Data Format Timeline Export 14 5 7 1 Date and Time 14 5 7 2 Sequence Number 14 5 7 3 Field Strength 14 5 7 4 DC Components 14 5 7 5 Band 14 5 7 6 GPS Data 15 5 7 7 Marker 15 5 8 Installing the USB Driver 15 6 Technical Specifications 16 6 1 Frequency Bands and Measurement Range 16 6 2 Bandwidth and Resolution 16 6 3 Sensitivity 16 6 4 Accuracy and Drift 18 6 5 L...

Page 4: ...st important elements and controls of the device are shown in Figure 1 The magnetic field sensors 1 are located at the front of the device about 15 mm underneath the arrows identifying the orientation of the three measurement axes The Multi color LED 2 is the main activity indicator of the device The marker button 3 can be used to highlight specific events during a measurement Figure 1 ExpoM ELF e...

Page 5: ...initialization After initialization the device switches over to measurement mode Measurement mode The LED lights red during each measurement If GPS is enabled an additional green flash signalizes a successful GPS position fix Connection to PC Continuous yellow light Auto Power down low battery Series of fast red flashes after which the device powers off Wi Fi connection Single blue flash WiFi conn...

Page 6: ...samples The flagged samples are highlighted by means of an ascending marker number visible in the exported data 3 3 Personal Measurements When using ExpoM ELF for personal measurements the movement of the person will lead to measurement artifacts due to the magnetic sensors that are moved through the static earth magnetic fields These artifacts can lead to a lower measurement sensitivity towards l...

Page 7: ... at least 1A 1000mA More information about suitable USB charger types for ExpoM ELF can be obtained from the distributor Important Notice At environmental temperatures above 45 C ExpoM ELF should not be charged Direct exposure to sunlight during the charging process should be avoided Note The actual charging time depends on the charger model and the type of USB cable used Long and or thin USB cabl...

Page 8: ...equires a Windows operating system Windows 7 and newer 5 2 The Main Window Figure 2 shows the elements of the ExpoM ELF Utility main window Figure 2 Main window of the ExpoM ELF Utility The window is organized into the following sections 5 2 1 Device Connection 1 Before any data can be downloaded from the device or its settings modified a connection to the ExpoM ELF device must be established via ...

Page 9: ...ng in the timeline plot selects a single measurement sample from the measurement The spectrum and the time domain signal from this sample are automatically displayed in the single measurement analysis plots Note that for a frequency component to be displayed in the timeline the corresponding measurement samples must have been recorded with a suitable ExpoM ELF band setting For example it is not po...

Page 10: ...nt axes This setting affects only the visualization in the plot and has no effect on the timeline or the exported data Save current Plot saves a CSV file containing the spectrum data and a second file containing the time domain data If one of the two files are not needed the corresponding export can be disabled by unselecting the corresponding checkbox 5 2 9 Additional Information 9 This section d...

Page 11: ...rements into a proprietary raw file format mmm that retains all information In addition single measurements as well as the timeline can be exported into an Excel or CSV file 5 4 1 Raw Measurement File mmm file When new measurement is downloaded from ExpoM ELF we recommend to first save it into a raw measurement file mmm This data format ensues that the full spectral and time domain as well as all ...

Page 12: ...slider allows to set a filter on the quality of the GPS positioning accuracy When this option is enabled GPS data captured in bad reception conditions is discarded in the KML export Caution setting the filter too strict can lead to no GPS data being exported at all Figure 4 Application Settings window 5 6 Device Settings The device settings dialog see Figure 5 can only be changed when a device is ...

Page 13: ...o position data will be logged during this time The first few GPS measurements can have reduced position accuracy 5 6 1 Firmware Update The firmware of ExpoM ELF can be updated to improve its functionality and features Firmware updates are published on our homepage and can be loaded to the device by the user When a device is connected the firmware updater can be started by clicking on the correspo...

Page 14: ...umber Each measurement is labeled with a sequence number Every time ExpoM ELF is switched on the sequence number starts at 1 If not interrupted by a power cycle the sequence number counts up to 65535 after which it restarts at 1 5 7 3 Field Strength The measured field strength of the frequency bands selected in the timeline All field values are expressed in Microtesla µT 5 7 4 DC Components Averag...

Page 15: ...y good 2 5 OK 5 limited accuracy Nsat Number of satellites in view higher numbers mean more robust GPS reception Speed Speed in km h determined by GPS In bad reception conditions speeds up to several km h are sometimes measured even in stationary conditions 5 7 7 Marker Tracks the number of marker button activations The measurement that was active at the time the marker button was pressed contains...

Page 16: ...ivity ranges with variable frequency resolution cover the frequency range from DC to 1 kHz 10 kHz and 100 kHz respectively An additional high field strength mode allows measurement up to 30 mT RMS from DC to 1 kHz Band Name Bandwidth Resolution Bandwidth Maximum Field Strength LF high resolution DC 1 kHz 1 Hz 1000 μT RMS MF DC 10 kHz 10 Hz 1000 μT RMS HF high bandwidth DC 100 kHz 100 Hz 1000 μT RM...

Page 17: ...60 8006 Zürich Schweiz 2017 Fields at Work GmbH Zurich ExpoM ELF manual rev 1 1 Page 17 19 Figure 8 Typical noise floor MF band DC 10 kHz Figure 9 Typical noise floor HF band DC 100 kHz Figure 10 Typical noise floor High B band DC 1 kHz ...

Page 18: ... The device can be configured to take a measurement on one or multiple bands see 6 2 within one measurement interval If multiple bands are selected it may be necessary to increase the measurement interval The recommended minimum measurement interval settings are given in the following table Table 2 Measurement Settings GPS ON GPS OFF One band 4 seconds 4 seconds Two bands 5 seconds 4 seconds Three...

Page 19: ...Built in rechargeable Li ion battery Typical operating time 24h 10 sec measurement interval GPS disabled Charging Micro USB interface USB compliant chargers are supported 1 5A recommended A full charge takes about 2 h 6 9 Other Size 16 cm x 8 cm x 3 5 cm L x W x H Weight 300 g Operating Conditions Temperature 5 C to 50 C Rel humidity 0 to 90 non condensing ...

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