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Fields at Work ExpoM-RF 4 User Manual

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ExpoM
– RF 4
User Manual
st
Revision 7.2 (March 21
, 2025)

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Summary of Contents for Fields at Work ExpoM-RF 4

  • Page 1 ExpoM – RF 4 User Manual Revision 7.2 (March 21 , 2025)
  • Page 2 Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland ExpoM – RF 4 User Manual 2025 Fields at Work LLC, Zurich Page 2/40 ExpoM - RF 4 manual (7.2)

  • Page 3: Table Of Contents

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland Contents 1 Description ..........................5 1.1. Principle of operation ....................5 2 Case and interfaces ........................ 6 2.1. Multi-color LED ......................6 2.2. USB interface and cable ....................7 3 Using ExpoM-RF 4 ........................8 3.1.
  • Page 4 Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland 7.1. Basic calibration option ....................30 7.2. Extended calibration option..................30 7.3. Full calibration option ....................30 8 Crosstalk optimizations ......................31 9 Smartphone App ........................33 9.1. Introduction ....................... 33 9.2.

  • Page 5: Description

    The ability to configure custom band lists with arbitrary frequencies from 50 MHz to 6 GHz gives ExpoM-RF 4 an unprecedented level of flexibility and makes it inherently future-proof with respect to changes in frequency band allocations and regulations.

  • Page 6: Case And Interfaces

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland 2 Case and interfaces The standard enclosure of ExpoM - RF provides basic water and shock protection of the exposure meter. The case includes following control elements and interfaces (Figure 2):...

  • Page 7: Usb Interface And Cable

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland 2.2. USB interface and cable ExpoM-RF 4 is equipped with a Micro-USB receptacle and is delivered with a corresponding cable that can be used both for charging and connecting to a computer. Although any standard compliant Micro-USB cable can be used with the device, it is recommended to always use the USB cable supplied with the device.

  • Page 8: Using Expom-Rf 4

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland 3 Using ExpoM-RF 4 3.1. Starting a measurement As soon as the device is turned on by means of the ON/OFF switch and successfully finished its startup procedure it starts to measure and log the data using the data logger settings stored in the device (described in section 5.6.

  • Page 9: Battery Management

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland 4 Battery 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 charging as soon as the device is connected to a powered USB source (wall adapter, PC, laptop etc.).

  • Page 10: Expom-Rf 4 Utility (Pc Software)

    The procedure to connect the Utility to the ExpoM - RF 4 device is as follows: 1. start ExpoM-RF4 Utility on the PC 2. connect the ExpoM-RF 4 device to the PC using an USB cable 3. turn on ExpoM-RF 4.

  • Page 11: Measurement Data Organization And Download

    ExpoM-RF 4 introduces a session-based organization of the measurement data. Every time that ExpoM-RF 4 is switched on, a new measurement session is automatically started and added to the existing ones. The device data manager (see Figure 5) lists all measurement sessions that are stored on the device.

  • Page 12: Plotting Data

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland operation can take several minutes depending on the number of measurement samples stored on the device, but the download can be interrupted at any time. Data sets that have been completely downloaded will be transferred to the Utility whereas partially downloaded data sets will be discarded.
  • Page 13 Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland When navigating to a specific time window there is the Time Selection box above the Main Plot, which overrides any dragging input done in the Main Plot. Select the start and end time of your time window and hit Apply.

  • Page 14: Saving The Measurement Data To File / Data Format

    ExpoM-RF 4 differentiates between two types of measurements. First, the normal measurements performed in logger mode according to the user-defined band list are referred to as LOGGER measurements.
  • Page 15 Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland GPS Longitude: DDDMM.mmmm D = degrees 3N + 7 GPS Lon M = Minutes m = minute decimals) 3N + 8 GPS Altitude GPS determined altitude above mean sea level in meters GPS accuracy indicator (lower = better) <...

  • Page 16: Kml Export

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland 5.5. KML Export Figure 8: KML example on Google Earth With a KML file you can visualize your measurement path and the corresponding field strengths on a map (e.g. Google Earth). To that end a KML exporter is integrated which can be entered by clicking on the Save to KML button in the Measurement Data section.

  • Page 17: Device Settings

    5.6. Device Settings Changing the settings of a device requires it to be either connected to the ExpoM-RF 4 Utility or to the ExpoM-RF 4 App (for the App please refer to Chapter Figure 1). Some of these settings can also be changed when the device is used with the smartphone app.
  • Page 18 Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland System settings The System section contains the general device settings: Description Setting A user defined name can be given to the connected device. The device name is shown in the exported measurement data and can be used to identify a specific device.

  • Page 19: Data Logger Settings

    Please refer to chapter 10.3. 10.2. of this manual for minimum sample interval recommendations. The field strength measurement range of ExpoM-RF 4 can be adapted depending on the expected levels of exposure and detection priorities. The lowest setting (up to 6 V/m) provides the highest sensitivity for weak...

  • Page 20: Setting Up Pin Lock

    As long the device remains connected this PIN can be disabled or a new PIN can be set. Once the device got disconnected the device is locked. When connecting again to the device, ExpoM-RF 4 Utility will request its corresponding PIN.
  • Page 21 Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland Figure 12: Device Settings window showing 2025 Fields at Work LLC, Zurich Page 21/40 ExpoM - RF 4 manual (7.2)

  • Page 22: Spectrum Scan (Spectrum Analyzer Mode)

    Important Note: The spectrum analyzer feature is available on all ExpoM-RF 4 devices, regardless of the chosen calibration option. However, the field strength values of the spectrum shown by devices calibrated with the basic calibration option (option 1, list of 25 bands) will not be calibrated over the full range of the device and therefore exhibit a larger uncertainty.
  • Page 23 Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland Figure 14: Selecting the spectrum scan feature Figure 15: Displaying the results of a spectrum scan 2025 Fields at Work LLC, Zurich Page 23/40 ExpoM - RF 4 manual (7.2)

  • Page 24: Installing The Usb Driver

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland 5.10. 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. Make sure that the device is switched on the whole time.

  • Page 25: Troubleshooting

    6 Troubleshooting 6.1. How can I improve the battery runtime? There are several ways how the run time of ExpoM-RF 4 can be improved: • Disable GPS if not necessarily needed. The effect of this measure is most noticeable when long sample intervals are selected •...
  • Page 26 Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland Troubleshooting • Restart Utility: While having the device turned on and plugged in to the computer, restart the utility and check again. • Choose other USB Port: You may try to connect the device to another USB slot (you may avoid USB hubs or docking stations.

  • Page 27: Window Display Issues

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland Figure 18: How it is: Device Manager recognized device as USB Serial Port in Other devices. 6.4. Window Display Issues You may face the issue in which a specific window is not displayed correctly, i.e. an edge may be cut off.
  • Page 28 Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland Figure 20: Changing display settings. Another setting that can interfere with properly scaling the application is Window’s “Fix scaling for apps” option. This can be found in the “Advanced scaling settings” (as seen in Figure 21) and should preferably be turned OFF for more consistent results.

  • Page 29: Unusually High Measurement Values In 2.4 Ghz Wifi Band

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland 6.5. Unusually high measurement values in 2.4 GHz WiFi band Higher than expected field strength measurements in the frequency range from 2400 – 2483.5 MHz can be observed when WiFi connectivity is enabled on the device. This effect is due to ExpoM-RF measuring the emissions of its own built-in WiFi module which take place in the frequency range between 2400 and 2483.5 MHz.

  • Page 30: Device Calibration Options

    Each of the 25 bands can consist of any combination of center frequency and bandwidth allowed by ExpoM-RF 4. This option is recommended for customers who are mainly interested in the assessment of the personal RF-EMF exposure from cell phones, base stations, and other wireless consumer electronics.

  • Page 31: Crosstalk Optimizations

    In practice however, there is a steep but finite transition region between the passband and rejection band. If ExpoM-RF 4 is set to measure two bands which are very closely spaced, the actual pass band response of the filter set to band A may partially extend into the adjacent band B, leading to part of the energy of band B being measured also when measuring band A.
  • Page 32 Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland the band edges of the filter. For this reason, shifting the center frequency of a band in the measurement settings by a few MHz will not make any noticeable differences in the measured field strength in most cases.

  • Page 33: Smartphone App

    9.2. Device Setup Connecting the app to a device requires Wi-Fi to be enabled on the ExpoM-RF 4 device. This is accomplished using the utility. Please refer to chapter 5.6.

  • Page 34: Troubleshoot

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland After leaving the setup the main window presents the following options: - Live View - Spectrum Scan - ExpoM Settings - Setup Guide - Troubleshoot Figure 25: Main window showing all available options 9.5.

  • Page 35: Spectrum Scan

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland Change displayed data (RMS, Peak or both simultaneously). Change text size (small - medium - large) Refresh button. Long tap: change from automatic (default) to manual mode A bar will give a...
  • Page 36 Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland Change displayed data (RMS, Peak Start a scan. or both simultaneously). Figure 27: Spectrum Scan View It is recommended to use the spectrum scan view in horizontal mode. The plot can be zoomed in and out using two fingers and reset to default by a double tap.

  • Page 37: Expom Settings

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland 9.8. ExpoM Settings The ExpoM Settings perspective provides control over the following settings: - System Settings: Enable/disable GPS - Measurement Settings: Sample Interval, Sensitivity Range Additionally, the following Device Information is displayed:...

  • Page 38: Technical Specifications

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland 10 Technical Specifications 10.1. Frequency bands and measurement range Frequency range 50 MHz to 6.0 GHz continuous frequency coverage Frequency bands Pre-defined or fully customizable lists of center frequencies (selectable in software)

  • Page 39: Connectivity / Storage

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland Certified for CE (Europe), FCC (US), MIC (Japan), CB Ref. Certif. No. CH-11129 US: Contains FCC ID: 2ADHKATWINC1500 Conformity Japan: This equipment contains specified radio equipment that has been certified to the Technical Regulation Conformity Certification under the Radio Law.

  • Page 40: Expom-Rf Utility Software

    Fields at Work LLC, Hegibachstrasse 41, 8032 Zurich, Switzerland 10.7. ExpoM-RF Utility Software Processor Dual core processor recommended Operating Systems Windows (7, 8, 10, 11) Storage usage 850 MB / 20 MB (Lightweight version) No installation required – ExpoM RF Utility can be started directly. For the Installation Lightweight installation the appropriate .NET version needs to be installed...

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