Fields at Work ExpoM - RF Manuel utilisateur

ExpoM - RF

User Manual

Fields at Work GmbH, Hegibachstrasse 41, 8032 Zürich, Schweiz 
2019 Fields at Work GmbH, Zurich Page 2/16 ExpoM - RF manual rev. 2.3
ExpoM - RF 
 
User Manual 
 
Contents 
1Description .............................................................................................................................. 3 
2Case and interfaces.................................................................................................................. 3 
2.1. Multi-color LED .............................................................................................................. 4 
3Using ExpoM - RF ..................................................................................................................... 4 
3.1. Starting a measurement ................................................................................................ 4 
3.2. Setting a marker............................................................................................................. 5 
4Battery management............................................................................................................... 5 
4.1. Charging the battery ...................................................................................................... 5 
4.2. Over-discharge protection (automatic shutdown) ........................................................ 6 
5ExpoM - RF Utility (PC Software).............................................................................................. 6 
5.1. Installing the USB driver............................................................................................... 10 
5.2. Data format.................................................................................................................. 10 
6Smartphone App.................................................................................................................... 11 
6.1. Establishing the Bluetooth connection........................................................................ 11 
7Technical Specifications ......................................................................................................... 13 
7.1. Frequency bands and measurement range ................................................................. 13 
7.2. RF Measurement.......................................................................................................... 13 
7.3. Size / Conditions........................................................................................................... 13 
7.4. Connectivity / Storage.................................................................................................. 13 
7.5. Battery Management................................................................................................... 14 
7.6. ExpoM RF Utility Software ........................................................................................... 14 
7.7. ExpoM RF Android Software........................................................................................ 14 
 
 

Fields at Work GmbH, Hegibachstrasse 41, 8032 Zürich, Schweiz

2019 Fields at Work GmbH, Zurich Page 3/16 ExpoM - RF manual rev. 2.3

1Description

ExpoM - RF is a personal radio frequency exposure meter. Band selective measurements allow for a

detailed differentiation of the different electromagnetic field sources. The 16 bands covered by this

device include all major wireless communication and broadcasting services, including LTE. ExpoM -

RF stands out due to its true-RMS detection method. This approach ensures modulation insensitive

measurements, allowing for meaningful cross-standard field value comparisons.

Additional features include GPS based outdoor localization and Bluetooth connectivity. The

integrated Bluetooth module allows to stream the measurement data to any Android based device

for real-time display.

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.

Important notice: After switching on the device it may take several minutes for the GPS receiver to

search for satellites. No position data will be logged during this time. The first few measurement

points may be quite inaccurate.

2Case and interfaces

The standard enclosure of ExpoM - RF provides basic water (IP 64) and shock protection of the

exposure meter. The case includes following control elements and interfaces (0):

Figure 1: ExpoM –RF control elements: Multi-color LED (1), Marker button (2), Mini-USB interface (3), ON/OFF switch (4)

Fields at Work GmbH, Hegibachstrasse 41, 8032 Zürich, Schweiz

2019 Fields at Work GmbH, Zurich Page 4/16 ExpoM - RF manual rev. 2.3

2.1. Multi-color LED

Status information about the operation of the device is given via the multi-color LED. The following

table shows an overview about the color code and its corresponding behavior.

Situation

Multi-color LED

Device initialization (after power on)

1. White flash immediately after switch is turned on;

2. Bluetooth init: Blue light for 2 sec; only if Bluetooth is enabled

3. Successful initialization is signalized by a quick color sweep

After initialization ExpoM - RF switches over to measurement mode.

Measurement mode

Short red flash after each measurement. If GPS is enabled, an additional

green flash signalizes a successful GPS position fix.

Charging the battery

Continuous red light. Turns off as soon as the battery is fully charged.

Connection to PC

Continuous yellow light.

Bluetooth connection

Single blue flash: Bluetooth connection established

Double blue flash: Bluetooth has been disconnected

Marker button pressed

Blue light lights up for about one second

Initialization error at power on

Series of fast red flashes shortly after power-on. Device has to be restarted

using the ON/OFF switch.

3Using ExpoM - RF

3.1. Starting a measurement

As soon as the device is turned on by means of the ON/OFF switch it starts to measure and log the

data using the last device settings (described in paragraph 5 / Figure 6). The device can be turned

on and off at any time. When ExpoM - RF is powered on, the new measurements are appended to

the existing log file preserving all previously recorded data. The internal memory can only be cleared

using the ExpoM - RF Utility on the PC (see chapter 5).

Important notice: During the measurement the device should not be hold in the hand and not be

placed on a metallic surface. Both can influence the receiving characteristics of the built-in antennas

and therefore influence the measurement. If it is required to use it as a handheld device, please

contact the distributor for an additional calibration (additional calibration will cause additional

costs).

Important notice: The measured data is saved to the internal memory every 6 samples. Before each

memory access it is temporarily held in a volatile memory that is erased when the device is turned

off. It is therefore recommended not to switch off the device for at least 6 additional measurements

after the required time end point.

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2019 Fields at Work GmbH, Zurich Page 5/16 ExpoM - RF manual rev. 2.3

3.2. Setting a marker

The Marker button on the top of the device can be used to flag single measurement samples. The

flagged samples are highlighted by means of an ascending marker number visible in the

measurement results after download. The marker number can be reset with ExpoM - RF utility on

the PC (see chapter 0).

4Battery management

4.1. Charging the battery

The USB interface is used to recharge the internal battery or power the device from an external

power source. Unless it is already fully charged, the battery is recharged as soon as the device is

connected to a powered USB source (Wall adapter, PC, laptop etc.). Any compliant USB port and

chargers providing at least 1000 mA can be used for this purpose.

While ExpoM - RF is charging the battery, the multi-color LED lights solid red. At the end of the

charging cycle the red light turns off.

Important Notice: Using USB chargers that do not fulfill the USB dedicated charger port specification

can lead to incomplete and slow charging process of the batteries. It is strongly recommended to

use an USB charger with a current rating of at least 1A (1000mA). More information about suitable

USB charger types for ExpoM - RF can be obtained from the distributor.

Important Notice: Although it is possible to perform measurements while charging ExpoM - RF it is

inadvisable to do so. The charging cable falsifies the antenna characteristics, reducing the

measurement accuracy. Frequency bands below 1 GHz are particularly susceptible to this effect.

Important Notice: At environmental temperatures above 45°C ExpoM - RF 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 cables can significantly increase the required charging time regardless of which

type of charger is used. It is recommended to the USB cable provided with the device.

Fields at Work GmbH, Hegibachstrasse 41, 8032 Zürich, Schweiz

2019 Fields at Work GmbH, Zurich Page 6/16 ExpoM - RF manual rev. 2.3

4.2. Over-discharge protection (automatic shutdown)

In order to preserve its capacity as long as possible, the internal battery must be prevented from

being discharged below a critical level. ExpoM - RF includes a battery monitoring circuit that powers

the device down when a critically low battery level (below 3% remaining capacity) is detected. After

such an automatic power down it is recommended to switch ExpoM - RF off using the ON/OFF switch

and charge it for at least 10 minutes before switching it on again.

5ExpoM - RF Utility (PC Software)

The ExpoM - RF Utility software is required for transferring and displaying the measurement data

from the ExpoM - RF to a PC and for changing the various device settings. This software is currently

only available for Windows operating systems.

Figure 2: Main window of the ExpoM - RF Utility Software

In the following the functions of the different buttons in the menu bar are explained:

"Load file": When selecting the 'Open file' button any measurement file previously

saved on the PC can be selected and loaded into the Utility. When loading is

completed the data is displayed in the large window (see Figure 3). The procedure

of selecting the file to be opened corresponds to the one of all common Windows

software.

Fields at Work GmbH, Hegibachstrasse 41, 8032 Zürich, Schweiz

2019 Fields at Work GmbH, Zurich Page 7/16 ExpoM - RF manual rev. 2.3

Figure 3: Main window with displayed data set after loading

"Save data": All data loaded to the software is saved at the selected location on

the PC. This function corresponds to the 'Save As' functionality of all common

Windows software.

"KML GPS export": The data is exported in a file format that can be directly loaded

into Google Earth.

"ExpoM": Connecting to an ExpoM - RF device and change the device settings.

Please make sure to turn on your ExpoM - RF and connect it to the PC using an

USB cable. When this button is pressed, following window will appear:

Fields at Work GmbH, Hegibachstrasse 41, 8032 Zürich, Schweiz

2019 Fields at Work GmbH, Zurich Page 8/16 ExpoM - RF manual rev. 2.3

Figure 4: Dialog window for connecting to an ExpoM - RF via USB

The USB Port control element on the top left lists all serial ports found on the computer. If your

device has been successfully recognized, there will be at least one entry in the USB port drop-down

menu. If more than one port was found on your computer, it is possible that a wrong one is chosen

by the application. In that case it is necessary to select the right port number manually using the

drop-down menu. If the Utility it is not able to recognize any COM port or no connection to your

device is possible even after several attempts, please refer to chapter 5.1. .

Turn on ExpoM RF. Wait 3-5 seconds for the device to switch into measurement mode and select

Connect to ExpoM. As soon as a connection to the device has been successfully established the

command window will change and the data information of the device is displayed (Figure 5).

Figure 5: Dialog window after selecting the device

Using the Download data button the data stored on the device is downloaded and displayed in the

Main window. Depending on the number of measurement samples stored on the device this

operation can take several minutes. The Delete data button erases all the data saved on the device.

Selecting the Device settings... button brings you to the Device Settings window shown in Figure 6.

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2019 Fields at Work GmbH, Zurich Page 9/16 ExpoM - RF manual rev. 2.3

Figure 6: Device settings dialog window of the Expom - RF

In this window the connectivity options (Bluetooth and GPS) can be switched on and off. This will

improve runtime of the device. The date and time of the real time clock in the device is displayed

and can be synchronized with the computer clock that the device is connected to. The sampling

interval (in seconds) can be either selected in a pull down menu or entered in the corresponding

text field. Values between 3 and 3000 seconds in steps of 0.1 second are accepted. The device’s

marker number counter is reset to 0 using the Reset button in the Marker counter section.

"Print chart": Printing of the curves displayed in the main window. If the monitor

window is open, the monitor data is also printed.

"Settings": This button directs you to the application settings dialog window

displayed in the following:

Figure 7: Application Settings Window

Fields at Work GmbH, Hegibachstrasse 41, 8032 Zürich, Schweiz

2019 Fields at Work GmbH, Zurich Page 10/16 ExpoM - RF manual rev. 2.3

The application settings allow to modify the band names and the corresponding color. These

settings are stored locally and will be automatically activated every time ExpoM - RF utility is started.

The Google Earth export options allow to customize the appearance of the 3D bar graph of the

exported KML files. Please note that a new KML file has to be exported for changes to take effect.

The accuracy 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 8: Main window with displayed data set and monitor window displaying the field strengths

5.1. Installing the USB driver

The USB driver required for ExpoM RF is included with most Windows versions and is automatically

installed the first time ExpoM - RF is connected to the PC. If the automatic driver installation fails,

however, it is necessary to install the driver manually. The driver can be found on our homepage

(www.fieldsatwork.ch/index.php?page=downloads).

5.2. Data format

ExpoM - RF PC utility can store the measurement data in two different file formats, Excel (xlsx) and

CSV. All field strengths are given in Volts per meter (V/m).

Being a simple and universal text based file format, a CSV file can be imported into virtually any

spreadsheet application (Excel, Open-/LibreOffice etc.). In both formats the measurements are

stored chronologically row by row in a table. Following information is contained in each row:

Table des matières

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