NARDA EFA-200 Operating Manual
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NARDA EFA-200 Operating Manual

Em field analyzer, 2245/20, 30, series a
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EFA-200/-300
EM Field Analyzer
Operating Manual

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Summary of Contents for NARDA EFA-200

  • Page 1 EFA-200/-300 EM Field Analyzer Operating Manual...
  • Page 3 EFA-200/-300 EM Field Analyzer 2245 /20, 30, Series A ... Operating Manual...
  • Page 4 If you have any questions about this product, please contact the Sales Company for your locality. Narda Safety Test Solutions GmbH Sandwiesenstr. 7 72793 Pfullingen, Germany © 2006 Order no.: 2245/98.22 Edition : 05/06.03, A ... Previous Edition: 04/05.03, A ...

  • Page 5: Table Of Contents

    CONTENTS Introduction About these instruments ....1-1 1.1.1 Applications ......1-1 1.1.2 Common features .
  • Page 6 3.4.1 Measurement setup ..... . . 3-8 3.4.2 Assembling the E-Field Unit measurement setup........3-10 3.4.3 E-Field Unit function test .
  • Page 7 6.1.7 Saving data ......6-8 Exposure STD mode (Shaped Time Domain) . . . 6-9 6.2.1 Activating STD mode.
  • Page 8 6.4.7 Evaluating measurement results ... . 6-31 6.4.8 Saving data......6-34 6.4.9 Possible problems .
  • Page 9 Software update ......10-4 10.2.1 Installing the software “EFA-200/-300 Tools”. . . 10-5 10.2.2 Setting up the EFA – PC connection ..10-6 10.2.3...
  • Page 10 Remote control 11.1 Abbreviations used ..... . . 11-1 11.2 Making the connection from EFA to PC ..11-1 11.3 Structure of device-specific commands .
  • Page 11 12.3.6 Averaging time / Refresh rate ....12-9 12.3.7 Measurement uncertainty ....12-9 12.3.8 Result display .
  • Page 12 12.7.3 Declaration of origin ..... 12-22 12.7.4 Maintenance ......12-22 12.7.4.1 Calibration interval .
  • Page 13 Operating concept Chap. 3.3 Chap. 3.4 Selecting an Chap. 5 operating mode Activating an Chap. 6 operating mode Measurement Chap. 6 Measurement Chap. 7 data memory Further Chap. 8 settings Device Chap. 9 data memory...

  • Page 15: Introduction

    1.1.2 Common features The EFA-200 and EFA-300 Field Analyzers are devices for monitoring low- frequency fields in the range 5 Hz to 32 kHz. All instrument functions are designed for ease of use under practical conditions. Operation has been arranged so that the instruments can be set as simply as possible using function keys and menu keys.

  • Page 16: Differing Features

    USER key. 1.1.3 Differing features The main differences between the EFA-200 and EFA-300 result from the different measurement objectives. They are readily apparent from the different measurement setups that are used. EFA-200 – magnetic field measurements The EFA-200 is for measuring magnetic fields.

  • Page 17: About This Operating Manual

    Basic Unit without the E-Field Unit. About this operating manual The two device types EFA-200 and EFA-300 differ in their measurement objectives (magnetic flux density or electric field strength). However, operation of the devices is to a large extent identical since the basic functions of the EFA-300 and EFA-200 are the same.
  • Page 18 1 Introduction EFA-200/-300 Notes:...

  • Page 19: Safety Instructions

    Safety instructions Before connecting up This instrument left the factory in perfect condition. To ensure safe usage and to preserve it in good condition, please follow the safety instructions below. Correct use The instrument must only be used under the conditions and for the purposes for which it was designed.

  • Page 20: Ac Power Supply Unit

    2 Safety instructions EFA-200/-300 Malfunction The accuracy and function of the instrument can be impaired by incorrect use, damage and unauthorized repairs. Caution ⇒ Only use the instrument under the conditions and for the purposes for which it was designed.

  • Page 21: Faults And Excessive Stresses

    EFA-200/-300 2 Safety instructions Faults and excessive stresses The instrument must be taken out of service and secured against unauthorized use if safe operation can no longer be guaranteed. This is the case, for example: • if the instrument shows visible signs of damage •...
  • Page 22 2 Safety instructions EFA-200/-300 Notes:...

  • Page 23: Preparation For Use

    Preparation for use Unpacking 3.1.1 Packaging Do not discard the packing materials. These items have been specially designed to be reused if they are not damaged. Always use the original packaging when transporting the instrument if possible. 3.1.2 Checking the package contents Ordering information: see page 12-23 3.1.3 Checking for transport damage...

  • Page 24: Power Supply

    3 Preparation for use EFA-200/-300 Power supply • The EFA-200 / -300 Basic Unit operates from dry cells or rechargeable batteries. • The E-Field Unit for the EFA-300 contains built-in rechargeable batteries. 3.2.1 Operation from rechargeable batteries / dry cells...

  • Page 25: Charging The Rechargeable Batteries

    EFA-200/-300 3 Preparation for use 3.2.2 Charging the rechargeable batteries A complete recharge takes about 3 hours. Danger of explosion Alkaline batteries can explode if you attempt to recharge them. ⇒ Before starting to recharge the batteries, make sure that rechargeable cells and not alkaline batteries are fitted in the battery compartment.

  • Page 26: Preparing For B-Field Measurements

    3 Preparation for use EFA-200/-300 Preparing for B-field measurements 3.3.1 Measurement setup The complete measurement setup for measuring a B-field consists of: • the Basic Unit • an external B-Field Probe (optional) No person or object should be between the radiation source and the probe while the measurement is being made.

  • Page 27: Connecting / Disconnecting The External B-Field Probe

    EFA-200/-300 3 Preparation for use 3.3.3 Connecting / disconnecting the external B-Field Probe The 12-way connector socket for the external B-field probe is on the head of the EFA. Locking sleeve Figure 3-1 External B-Field Probe Connecting the B-Field Probe 1.
  • Page 28 3 Preparation for use EFA-200/-300 Function test The function test checks the internal memory, display, signal processor and the internal signal path. • While the function test is running: – the test screen is displayed – the red Alarm LED flashes.
  • Page 29 EFA-200/-300 3 Preparation for use Possible malfunctions The instrument does not operate. The batteries are completely discharged. ⇒ Recharge the rechargeable batteries or replace the dry cells. Charging the rechargeable batteries: see page 3-3 Replacing the rechargeable batteries / dry cells: see page 10-1 –...

  • Page 30: Preparing For E-Field Measurements

    3 Preparation for use EFA-200/-300 Preparing for E-field measurements 3.4.1 Measurement setup For EFA-300 only The E-Field Unit is used to measure electric fields. Unlike measurements of magnetic fields, electric field measurements are easily influenced by persons or objects in the vicinity of the sensor.
  • Page 31 EFA-200/-300 3 Preparation for use Example: The connection to the Basic Unit can be disconnected while the E field unit makes measurements and stores the results as a stand alone unit. You can then use the EFA-300 Basic Unit to measure magnetic fields independently of the E-Field Unit.

  • Page 32: E-Field Unit Function Test

    3 Preparation for use EFA-200/-300 3.4.2 Assembling the E-Field Unit measurement setup 1. Screw the E-Field Unit to the tripod. 2. Connect the fiber optic cable to the E-Field Unit connector socket. 3. Connect the fiber optic cable to the PROBE connector socket of the EFA-300 Basic Unit.
  • Page 33 EFA-200/-300 3 Preparation for use Possible faults Faulty operation Data will be lost in transmission down the fiber optic cable if the cable is kinked or bent sharply. Caution ⇒ When assembling the measurement setup, avoid kinking or bending the fiber optic cable.
  • Page 34 3 Preparation for use EFA-200/-300 Notes: 3-12...

  • Page 35: Control And Display Elements

    Control and display elements For an overview of the position of all control and display elements, see the figure in the back. Basic Unit keyboard Element Function ON/OFF • Powers up the device with the settings that were active when it was last powered down. •...
  • Page 36 4 Control and display elements EFA-200/-300 Element Function SAVE Saves sets of data. • Triggers the save action in the menu. • Saves – individual data sets – individual spectra – individual result lists Navigation keys UP key Step key for entering numerical data or selecting from menus.
  • Page 37 EFA-200/-300 4 Control and display elements Element Function Jumps from a sub-menu back to the next higher menu level. • Rejects a change in a numerical entry. • Rejects a change in a selection. ENTER Concludes entries and exits from the menu •...
  • Page 38 4 Control and display elements EFA-200/-300 Element Function CONF CONFG Opens the menu • Enables: – selection of the alarm function – selection of the measurement unit – selection of current value documentation – setting of date and time – editing of the frequency list –...

  • Page 39: Basic Unit Display

    EFA-200/-300 4 Control and display elements Basic Unit display 4.2.1 Liquid crystal display The content and format of the display vary greatly according to the operating mode. Section 6 (Operating modes) explains these displays with illustrations. 4.2.2 Backlight The display backlight uses a lot of energy and should therefore only Note: be used when absolutely necessary.

  • Page 40: Basic Unit Indicators

    4 Control and display elements EFA-200/-300 Figure 4-1 Display when setting the contrast Basic Unit indicators Element Function ON INDICATOR, GREEN Indicates that the instrument is ready to use. CHARGE INDICATOR, YELLOW Battery charging indicator • On continuously during charging.

  • Page 41: E-Field Unit Controls

    EFA-200/-300 4 Control and display elements E-Field Unit controls Element Function ON/OFF • Starts the E-Field Unit. ON INDICATOR, GREEN Indicates that the device is ready to use. CHARGE INDICATOR, YELLOW Battery charging indicator • On continuously during charging. • Flashes slowly if there is a fault during charging.
  • Page 42 4 Control and display elements EFA-200/-300 Notes:...

  • Page 43: Selecting An Operating Mode

    Selecting an operating mode Operating mode applications Suitable for evaluating: Fields of one Multiple Pulsed fields specific frequency frequency fields • Transformer • Transformer • Welding stations stations equipment • Railroad lines • Railroad lines • High tension • Offices •...

  • Page 44: Operating Mode Features

    5 Selecting an operating mode EFA-200/-300 Operating mode features 5.2.1 Field Strength mode Selective and broadband time-domain measurements Figure 5-1 Field Strength mode measurement screen Measurement of overall field strength or the field strengths Measurement aim: of individual frequency components.

  • Page 45: Exposure Std Mode (Shaped Time Domain)

    EFA-200/-300 5 Selecting an operating mode 5.2.2 Exposure STD mode (Shaped Time Domain) Broadband measurement with simultaneous limit value evaluation in real time Figure 5-2 STD evaluation mode measurement screen Rapid, reliable evaluation of field exposure with reference to Measurement aim: a prescribed limit value curve.

  • Page 46: Spectrum Fft Mode (Fast Fourier Transformation)

    5 Selecting an operating mode EFA-200/-300 5.2.3 Spectrum FFT mode (Fast Fourier Transformation) Recording of curves (time domain) with subsequent determination of spectra (frequency domain) Figure 5-3 Spectrum FFT mode measurement screen Measurement of the field strengths of all frequency Measurement aim: components.

  • Page 47: Harmonic Analysis Mode

    EFA-200/-300 5 Selecting an operating mode 5.2.4 Harmonic Analysis mode Spectrum analysis with subsequent result evaluation Figure 5-4 Harmonic Analysis mode measurement screen Measuring the harmonics of a fundamental wave. Measurement aim: Contactless check of quality of an energy supply.

  • Page 48: Checking The Efa Operating Modes

    5 Selecting an operating mode EFA-200/-300 Checking the EFA operating modes Field Strength and Exposure STD modes are always available. Other operating modes can be enabled. Is the selected operating mode enabled? ⇒ Press the MODE key. All available operating modes will be displayed.

  • Page 49: Operating Modes

    Operating modes Field Strength mode The magnetic flux density or the electric field strength (RMS value or peak value) within a selected frequency range is determined in “Field strength” mode. Frequency range classes You can select one of the following three frequency range classes (frequency filters): Frequency range Explanation...

  • Page 50: Activating Field Strength Mode

    6 Operating modes EFA-200/-300 6.1.1 Activating Field Strength mode 1. Press the MODE key. The MODE menu lists all available operating modes. 2. Use the UP/DOWN keys to select the “FIELDSTRENGTH” function. 3. Press the ENTER key to confirm your selection.

  • Page 51: Selecting The Detection Mode

    EFA-200/-300 6 Operating modes 3. Press the ENTER key to confirm your selection. The automatically selected measurement range is shown with “AUTO” below it in the display field F1. Possible faults The over-range screen is displayed. Figure 6-2 Over-range screen The selected range is not suitable for the field being measured.

  • Page 52: Selecting The Display Mode

    6 Operating modes EFA-200/-300 6.1.4 Selecting the display mode Two display modes can be selected: • LIVE: Digital and analog displays show the current measurement value. • MAX: Digital and analog displays show the highest measurement value that has occurred since the “MAX” function was activated.
  • Page 53 EFA-200/-300 6 Operating modes Selecting the frequency range 1. Press key F4 to open the FILTER sub-menu. The functions for keys F1 to F4 change. • Key F1: BROAD BAND • Key F2: BAND PASS • Key F3: BAND ST0OP 2.

  • Page 54: Evaluating The Results

    6 Operating modes EFA-200/-300 2. Switch between the filters using keys F1 through F3. The last active frequency range of the selected filter is activated and indicated in the display field F4. The measured value changes according to the selected frequency range.
  • Page 55 EFA-200/-300 6 Operating modes Function Result validity indicator: • No icon: Computation of measured value complete • “■”: Note Internal calculation of result in progress, duration 1 sec. • “ “: Warning Measurement range exceeded The selected range is unsuitable for measuring the field under observation.

  • Page 56: Saving Data

    6 Operating modes EFA-200/-300 Figure 6-4 Analog result display scaling Left: Result display for AUTO range mode logarithmic scale 10 nT to 100 mT Right: Result display for fixed ranges logarithmic scale, here from 0.2 nT to 200 nT 6.1.7...

  • Page 57: Exposure Std Mode (Shaped Time Domain)

    EFA-200/-300 6 Operating modes Exposure STD mode (Shaped Time Domain) The features of the “Exposure STD” mode are very versatile, providing useful results for various application areas. This includes: • Consideration of different limit curves (standards) in measurement. The smallest value that can be shown in the basic display depends on the selected standard.

  • Page 58: Selecting The Display Mode

    6 Operating modes EFA-200/-300 6.2.3 Selecting the display mode Two display modes can be selected: • LIVE: Digital and analog displays show the current measurement value. • MAX: Digital and analog displays show the highest measurement value that has occurred since the “MAX” function was activated.
  • Page 59 EFA-200/-300 6 Operating modes Function Field quantity, in this case B-field Measurement axis shown as suffix; no suffix in this example = ISOTROPIC measurement Digital display of measured value The measured value is displayed as a % of the field strength limit defined in the limit curve.

  • Page 60: Saving Data

    6 Operating modes EFA-200/-300 6.2.6 Saving data Data can be captured and stored in the measurement data memory in the following ways in Exposure STD mode: • Save individual values Saving individual values: see page 7-2 • Record measurement values over a defined period of time...

  • Page 61: Spectrum Fft Mode

    EFA-200/-300 6 Operating modes Spectrum FFT mode The Spectrum FFT mode has two operating states: • Run: The spectrum is continuously measured and displayed. After selecting the mode, “Run” is the default active state. Measurement begins immediately. The “Run” state is indicated using the icon in the measurement screen.

  • Page 62: Selecting The Measurement Range

    6 Operating modes EFA-200/-300 6.3.2 Selecting the measurement range There are three ways to choose the measurement range: • Choose a value from the selection menu • Activate the “AUTO” function. The device automatically uses the proper measurement range. • Activate a limit curve The standard chosen in the STANDARDS menu is activated when choosing the measurement range.

  • Page 63: Selecting The Measurement Mode (Detection Mode)

    EFA-200/-300 6 Operating modes 3. Press the ENTER key to confirm your selection. The name of the standard entered in the STANDARDS menu will automatically appear in display field F1. Recording of measured values begins after the measurement Note: range is selected. If AVG RMS was chosen as the detection range, averaging is also restarted.

  • Page 64: Selecting The Frequency Range

    6 Operating modes EFA-200/-300 ⇒ To switch between display modes, press the F3 key. The selected display mode appears in display field F3. The display value “MAX” is cleared when switching to LIVE. When switching from MAX to LIVE, averaging is restarted if AVG Note: RMS was chosen as the detection mode.

  • Page 65: Starting And Stopping A Measurement

    EFA-200/-300 6 Operating modes 6.3.6 Starting and stopping a measurement Starting a measurement ✓ The device should be in the “Stop” state. The “Stop” state is indicated with the icon in the measurement screen. ⇒ Press the RUN key. The device should now be in the “RUN” state.
  • Page 66 6 Operating modes EFA-200/-300 Figure 6-8 Display elements of the measurement screen for Spectrum FFT mode Function Field quantity, here the B field Measurement axis, here the Z axis without footnote: ISOTROPIC Measured value axis Graphical display of the measured values...
  • Page 67 EFA-200/-300 6 Operating modes Function Display field F1: Display of the selected measurement range Validity indicator: • No icon: Internal measured value computation complete. • “■”: Note Internal measured value computation is underway. The displayed measured value has not yet reached its final value.

  • Page 68: Zooming In On The Frequency Axis

    6 Operating modes EFA-200/-300 6.3.7.1 Zooming in on the frequency axis The frequency axis can be displayed in two modes. Figure 6-9 Frequency axis display modes: Left: Full scale The frequency axis is logarithmic and represents the entire frequency range shown in display field F4.

  • Page 69: Zooming In On The Measured Value Axis

    EFA-200/-300 6 Operating modes 6.3.7.2 Zooming in on the measured value axis 1. Press the F1 key. Display fields F2 and F3 change their meaning. F2: YSCAL F3: YPOS (black background) Display field F4 disappears. 2. To activate setting of the display resolution, press the F2 key.

  • Page 70: Marker

    6 Operating modes EFA-200/-300 6.3.7.3 Marker The marker is a graphical tool for displaying the nine largest measured values within the measured frequency range. It is displayed as a signal marker in the measurement curve and indicated numerically as a pair of values (field strength and frequency).
  • Page 71 EFA-200/-300 6 Operating modes Positioning the marker ✓ The marker should be activated. 1. Press the UP/DOWN keys. The signal marker will jump within the measurement curve from the measured value to the next lower value. The graphical maker is displayed over the next lower measured value.

  • Page 72: Normalized Display

    6 Operating modes EFA-200/-300 6.3.7.4 Normalized display In this display mode, the selected limit curve is computed to appear as a straight line in the display, i.e. the 0 dB line. The actual measured values are recomputed in the same manner and the values are normalized. This lets you directly read off values with respect to the limit.

  • Page 73: Saving Data

    EFA-200/-300 6 Operating modes 6.3.8 Saving data In Spectrum FFT mode, you can save data as follows in the data memory: • Saving a single measurement Saving individual values: see page 7-2 Since each stored spectrum consists of a number of values, the Note: memory capacity is limited to about 16 spectra.

  • Page 74: Harmonic Analysis Mode

    6 Operating modes EFA-200/-300 Harmonic analysis mode After you enter a fundamental frequency, the field strength and the harmonic content are determined. You do not have to enter the fundamental frequency exactly because the evaluation algorithm has a certain tolerance.

  • Page 75: Selecting The Measurement Range

    EFA-200/-300 6 Operating modes 6.4.2 Selecting the measurement range The measurement range can be selected in two ways: • Select a value from a selection menu • Activate the “AUTO” function The device automatically selects the proper measurement range. Selecting a value from a selection menu ✓...

  • Page 76: Selecting The Measurement Mode (Detection Mode)

    6 Operating modes EFA-200/-300 6.4.3 Selecting the measurement mode (detection mode) If the “Standard” measurement range was chosen, the detection Note: mode is preselected and cannot be set. The F2 key and display field are deactivated. You can choose among three detection modes: •...

  • Page 77: Selecting The Fundamental Frequency

    EFA-200/-300 6 Operating modes 6.4.5 Selecting the fundamental frequency When measuring, only the selected fundamental frequency and its harmonics are considered. The evaluation algorithm used can cope with imprecise specifications of the frequency. Six values are defined in the selection list. One of these values can be entered as a variable fundamental frequency.

  • Page 78: Starting And Stopping A Measurement

    6 Operating modes EFA-200/-300 3. Press the F4 key. The window FUND opens with the current value for the variable fundamental frequency. The first digit of this value has a black background. 4. Use the UP/DOWN keys to change the digit.

  • Page 79: Evaluating Measurement Results

    EFA-200/-300 6 Operating modes The measurement should not be halted to evaluate results until the Note: validity indicator no longer appears in the display. The validity indicator indicates that internal measured value computation is still underway. In this case, the averaging of the measurement results has not yet taken place over the defined number of single values (NAVG) at the start of the measurement.
  • Page 80 6 Operating modes EFA-200/-300 Function Field quantity, here the B field Measurement axis, here without footnote: ISOTROPIC Measured value axis Graphical display of the measured values Frequency axis scaled as an index (multiple of the fundamental frequency selected in F4)
  • Page 81 EFA-200/-300 6 Operating modes Generating a result list ✓ The device should be in Stop mode. ✓ The main screen of Harmonic Analysis mode should be visible. ⇒ Press the NEXT key. The result list is displayed. Figure 6-14 Result list for Harmonic Analysis mode...

  • Page 82: Saving Data

    6 Operating modes EFA-200/-300 6.4.8 Saving data In harmonic analysis mode, you can save data as follows in the data memory: • Saving a single measurement Saving individual values: see page 7-2 6.4.9 Possible problems The settings (measurement range, detection mode, display mode, frequency range) cannot be changed.

  • Page 83: Measurement Data Memory

    Measurement data memory Saving data • The EFA can save individual values and the changes in field strength over a period of up to 24 hours can be monitored and recorded. • The date and time are recorded with each data set. Note: Make sure that the date and time settings are correct before recording data to ensure that the correct date and time are assigned to the data sets.

  • Page 84: Saving Individual Values

    7 Measurement data memory EFA-200/-300 7.1.1 Saving individual values Only for data set types normal, vector and list Saving a value ✓ Date and time have been set correctly. Setting the date and time: see page 8-9. ⇒ Press the SAVE key.

  • Page 85: Recording Timer-Controlled Measurement

    EFA-200/-300 7 Measurement data memory 7.1.2 Recording timer-controlled measurement sequences (AUTO) Timer-controlled storage of data allows you to record the measured values over a defined time period in Field Strength and Exposure STD modes. The B-Field Unit and the E-Field Unit operate independently during recording of a timer-controlled test series.
  • Page 86 7 Measurement data memory EFA-200/-300 Opening the AUTO menu ✓ Date and time have been set correctly. Setting the date and time: see page 8-9. Setting the date and time: see page 8-9 1. Press the MEM key. The MEM menu opens.
  • Page 87 EFA-200/-300 7 Measurement data memory Defining a time period for saving data ✓ The MEM AUTO menu is open. 1. Use the UP/DOWN keys to select the “START” function. 2. Press ENTER to confirm your selection. The first entry field for the start time is highlighted in black.
  • Page 88 7 Measurement data memory EFA-200/-300 7. Press key F1. • The measurement starts immediately and runs until the data memory is full (max. 24 hours). • The STOP function is no linger shown in the display. • The number of data sets MEM already saved and the last measurement value saved are displayed.

  • Page 89: Recording Spatially Assigned Measurement Sequences (Matrix)

    EFA-200/-300 7 Measurement data memory 7.1.3 Recording spatially assigned measurement sequences (MATRIX) Assigning measurement values to the spatial location where the measured value was obtained is very time-consuming when a series of measurements is evaluated. If the measured values are stored as a matrix, subsequent processing can be simplified with suitable computer programs.
  • Page 90 7 Measurement data memory EFA-200/-300 3. Press ENTER to confirm your selection. The MEM MATRIX menu is displayed. Figure 7-3 Entry screen for defining the limiting coordinates Function Coordinates of limit “A” Coordinates of limit “B” Display field F4: Switch to matrix measurement screen...
  • Page 91 EFA-200/-300 7 Measurement data memory 6. Press ENTER to complete entry. The value for the selected coordinate has been entered. The values for all remaining coordinates are defined in the same way. Tip: Limits A and B can be used to define areas, lines or points, depending on how many coordinates are set to the same value.
  • Page 92 7 Measurement data memory EFA-200/-300 Collecting measurement values All the values measured during the measurement are initially collected and stored in a data pool. Measured values are stored only when the Matrix measurement screen is active. All the values recorded and saved during a sequence of measurements are only saved as a contiguous data set when the sequence of measurements has been completed.
  • Page 93 EFA-200/-300 7 Measurement data memory Function Field quantity, here B-field Digital display of measured value Units of measurement Analog display of measured value Target coordinates that will be saved with the next measured value: • The listing depends on the selected ranking •...
  • Page 94 7 Measurement data memory EFA-200/-300 Changing the target coordinates The target coordinates can be changed within the defined spatial area at any time. ⇒ Press the UP key. The next target coordinate is calculated and displayed. – or – ⇒ Press the DOWN key.
  • Page 95 EFA-200/-300 7 Measurement data memory 2. Press the ESC key. The data pool is closed and saved under a common data set number. The MEM menu is displayed. Figure 7-5 A data set can be saved from the MEM MATRIX menu.

  • Page 96: Displaying A Data Set

    7 Measurement data memory EFA-200/-300 Displaying a data set The contents of the MEM SHOW menu depend on the intended measurements for the different measurement modes. 8, 9 Figure 7-6 MEM SHOW menu in Field Strength mode No. Function Operating mode...
  • Page 97 EFA-200/-300 7 Measurement data memory No. Function Operating mode Field Exposure Spectrum Harmonic Strength Analysis Frequency range used for measurement Bandpass Bandstop Value Field Exposure Frequency Field strength strength resolution [T, G, V/m] DF [Hz] fundamental [T, G, V/m] Validity marker # With data set of type “A”...

  • Page 98: Exporting Data

    ✓ Basic Unit or E-Field Unit is connected to a PC. Setting up the EFA – PC connection: see page 10-6 ✓ The software “EFA-200/-300 Tools” must be installed. Installing the software “EFA-200/-300 Tools”: see page 10-5 1. Start the “Datalog.exe” application.
  • Page 99 EFA-200/-300 7 Measurement data memory 2. Activate the “Enable” box for the data set type to be exported. 3. Enter in the “From” and “To” boxes the numbers of the data sets in the selected data set type to be exported.

  • Page 100: Deleting Data

    7 Measurement data memory EFA-200/-300 Deleting data The following can be deleted using the CLEAR menu: • The data set with the highest data set number • The entire data memory Opening the MEM CLR menu 1. Press the MEM key.
  • Page 101 EFA-200/-300 7 Measurement data memory Deleting the data set with the highest number ✓ The MEM CLR menu is activated. 1. Press F1. • The data set with the highest data set number will be deleted. • The data set with the next lower data set number will be displayed.
  • Page 102 7 Measurement data memory EFA-200/-300 Notes: 7-20...

  • Page 103: Optional Functions

    Optional functions Activating the CONFG menu ⇒ Press the CONF key. The CONFG menu will open. For Spectrum FFT and Harmonic Analysis modes only For the Spectrum FFT and Harmonic Analysis modes, all settings in the CONFG menu are possible only in the “RUN” state. Tip: You can exit the CONFG menu in two ways: Press the RUN key: Return to measurement screen Press the ESC key: Return to previous menu...

  • Page 104: Entering The Alarm Threshold

    8 Optional functions EFA-200/-300 8.1.2 Entering the alarm threshold ✓ The CONFG ALARM sub-menu is activated. ✓ You have determined the intended alarm threshold value. The threshold must always lie within the selected measurement Note: range, otherwise the alarm cannot be triggered.
  • Page 105 EFA-200/-300 8 Optional functions Activating the visible alarm signal 1. Use the UP/DOWN keys to select the “ALARM” function. 2. Press the ENTER key until “ALARM ON” is displayed. If the alarm threshold is exceeded, the red Alarm LED flashes. If the field value drops below the alarm threshold again, the red Alarm LED continues to flash, indicating that an alarm event has occurred.

  • Page 106: Recording Current Values

    8 Optional functions EFA-200/-300 Recording current values If recording of current values is activated, two selectable current values are saved with each data set. These data sets can be the actual wire current and the nominal current of an installation, for example.

  • Page 107: Activating Recording Of Current Values

    EFA-200/-300 8 Optional functions Entering current values 1. Use the UP/DOWN keys to select the required function. 2. To activate the entry fields, press the ENTER key. The first entry field is highlighted in black. 3. Use the UP/DOWN keys to define a value.

  • Page 108: Selecting The Measurement Axis

    8 Optional functions EFA-200/-300 ✓ The CONFG menu should be activated. 1. Use the UP/DOWN keys to select the “STANDARDS” function. 2. To activate the CONFG STANDARDS sub-menu, press the ENTER key. 3. Use the UP/DOWN keys to highlight the required limit curve in black.

  • Page 109: Selecting The Measurement Units

    EFA-200/-300 8 Optional functions Selecting the measurement units For B-field measurements only You can toggle between Tesla and Gauss for the B-field value measurement units. ✓ The CONFG menu should be activated. 1. Use the UP/DOWN keys to select the “AUX” function.

  • Page 110: Editing The Frequency Selection List

    8 Optional functions EFA-200/-300 Editing the frequency selection list In Field Strength (bandpass and bandstop filters only), Spectrum FFT and Harmonic Analysis modes, six frequency ranges are available in the selection lists. You can individually modify these frequency ranges with the “FREQ LISTS”...

  • Page 111: Setting The Date And Time

    EFA-200/-300 8 Optional functions Setting the date and time 8.8.1 Activating the “CLOCK” function ✓ The CONFG menu should be activated. 1. Use the UP/DOWN keys to select the “CLOCK” function. 2. To activate the CONFG CLOCK sub-menu, press the ENTER key.

  • Page 112: Setting The Current Time

    8 Optional functions EFA-200/-300 8.8.2 Setting the current time ✓ The CONFG CLOCK sub-menu is activated. Selecting the time display format The time can be displayed using the 12-hour or 24-hour clock formats. 1. Use the UP/DOWN keys to select the “MODE” function (directly below “TIME”).
  • Page 113 EFA-200/-300 8 Optional functions Entering the date 1. Use the UP/DOWN keys to select the “DATE” function. 2. Proceed as indicated under “Setting the current time”. Setting the current time: see page 8-10 8-11...
  • Page 114 8 Optional functions EFA-200/-300 Notes: 8-12...

  • Page 115: Device Data Memory

    Device data memory Whenever the EFA is switched on again, the settings that were active just before it was last switched off will be re-activated. Settings that you use often can be saved as a USER setup and re-activated when needed. Calling up a device setting (User Setup) 1.
  • Page 116 9 Device data memory EFA-200/-300 Parameter Section Value Measurement axis Sect. 8.4 Isotropic Measurement units Sect. 8.5 T (Tesla) Visible alarm Sect. 8.1.3 Audible alarm (BEEP) Sect. 8.1.3 Alarm threshold, B-field Sect. 8.1.2 10 mT Alarm threshold, E-field Sect. 8.1.2...
  • Page 117 EFA-200/-300 9 Device data memory Parameter Section Value Matrix block Sect. 7.1.3 XA = 0 YA = 0 ZA = 1 XB = 10 YB = 10 ZB = 3 Current position in block Sect. 7.1.3 XN = 0 YN = 0...

  • Page 118: Saving Device Settings (User Setup)

    9 Device data memory EFA-200/-300 Activating the default setup 1. Press the USER key. The USER menu opens. 2. Use the UP/DOWN keys to select the “FACTORY” function. 3. Press the ENTER key to confirm your selection. The settings saved in the USER menus are retained. All other settings are reset to the default values.
  • Page 119 EFA-200/-300 9 Device data memory Saving user setups under a USER name ✓ The USER menu is open. ✓ The desired USER name has been entered. 1. Use the UP/DOWN keys to select the USER name. 2. Press key F1.
  • Page 120 9 Device data memory EFA-200/-300 Notes:...

  • Page 121: Maintenance And Repairs

    10 Maintenance and repairs 10.1 Dry cells and rechargeable batteries 10.1.1 Replacing the rechargeable batteries / dry cells You should only replace the rechargeable batteries or dry cells Note: fitted in the Basic Unit. If the batteries in the EFA-300 sensor cube need to be replaced, return the instrument to one of our Service Centers.
  • Page 122 10 Maintenance and repairs EFA-200/-300 To remove batteries: Pull tape Figure 10-2 Removing the batteries 4. Check the position of the switch in the battery compartment: Switch -> Base of battery compartment: Use rechargeable batteries Switch -> Top of battery compartment: Use dry cells...

  • Page 123: Handling Rechargeable Batteries

    EFA-200/-300 10 Maintenance and repairs Possible faults The instrument does not work. The battery was inserted the wrong way round (+ and - poles exchanged). A fuse may have blown. ⇒ Contact the Service Center. 10.1.2 Handling rechargeable batteries • Always handle rechargeable batteries with care.

  • Page 124: Battery Disposal

    10 Maintenance and repairs EFA-200/-300 10.1.4 Battery disposal The instruments contain one built-in lithium battery and five NiMH rechargeable batteries or 5 alkaline batteries. ⇒ Dispose of the rechargeable batteries or alkaline batteries in accordance with the regulations governing such waste in your locality.

  • Page 125: Installing The Software "Efa-200/-300 Tools

    Internet. Older versions of this software should not be used any longer. ✓ Disc 1 “EFA-200/ -300 Tools” should be in the computer’s disk drive. 1. Run the file “SETUP.EXE” on diskette 1. This will open the installation program.

  • Page 126: Setting Up The Efa - Pc Connection

    3. Set the switch in the opto-electrical adapter to the “DTE” position (data terminal equipment). 10.2.3 Loading the device firmware ✓ The current version of the software “EFA-200/ -300 Tools” should be installed. Installing the software “EFA-200/-300 Tools”: see page 10-5 ✓...
  • Page 127 EFA-200/-300 10 Maintenance and repairs 8. In the window “Download – Select File” double-click on the copied file “*.sof” or use the SELECT button. A DOS window will open to show the progress (duration approx. 15 min.). Once completed, you will see the message “DOWNLOAD SUCCESSFUL”.

  • Page 128: Transferring Standards Parameters

    10.3 Transferring STANDARDS parameters The procedure described below is identical for the Basic Unit and for the E- Field Unit. ✓ The current version of the software “EFA-200/ -300 Tools” should be installed. Installing the software “EFA-200/-300 Tools”: see page 10-5 ✓...

  • Page 129: Enabling Operating Modes

    EFA-200/-300 10 Maintenance and repairs Possible problems Data communications not possible The serial interface “COM” to which the opto-electrical adapter is connected is not recognized or the switch on the opto-electrical adapter is not in the position “DTE”. The fiber optic cable might be kinked or bent.

  • Page 130: Entering The Access Code

    You might have to enter multiple access codes to enable an Note: operating mode. ✓ The current version of the software “EFA-200/ -300 Tools” should be installed. Installing the software “EFA-200/-300 Tools”: see page 10-5 ✓ The opto-electrical adapter should be connected to a serial interface “COM”...

  • Page 131: Reading Out The Device Characteristics

    EFA-200/-300 10 Maintenance and repairs Possible problems Data communications not possible The serial interface “COM” to which the opto-electrical adapter is connected is not recognized or the switch on the opto-electrical adapter is not in the position “DTE”. The fiber optic cable might be significantly kinked or bent.

  • Page 132: Cleaning

    Each device has its own ID number. 10.6 Cleaning • Do not use solvents to clean the EFA-200/-300 casing or probes or the Power Supply Unit. We recommend the use of lukewarm water to which a little liquid detergent has been added.

  • Page 133: Power Supply Unit

    EFA-200/-300 10 Maintenance and repairs 10.7 Power Supply Unit 10.7.1 Opening the device Electric shock Opening the Power Supply Unit may expose parts carrying dangerous voltages. Danger ⇒ Disconnect thePower Supply Unit from the AC line and all other voltage sources before opening it.
  • Page 134 10 Maintenance and repairs EFA-200/-300 Notes: 10-14...

  • Page 135: Remote Control

    11 Remote control 11.1 Abbreviations used The following abbreviations are used to represent the command structure: <ws> Space (CHR$32) or SP <CR> Carriage return (CHR$13) or ˆM or \r <LF> Line feed (CHR$10) or ˆJ or \n […] Optional entry The following numerical formats are used to define and read some commands: <SCI>...
  • Page 136 11 Remote control EFA-200/-300 When you use the EFA-TS PC software to remote control the EFA: EFA-TS queries the parameters to be used to set up the link between the PC and the EFA. If you select a baud rate of 19200, two attempts will be needed to set up the link.

  • Page 137: Structure Of Device-Specific Commands

    EFA-200/-300 11 Remote control 11.3 Structure of device-specific commands A distinction is made between write / action commands and read commands. Write / action commands • Write / action commands are used to: – Enter parameter definitions – Trigger actions •...
  • Page 138 11 Remote control EFA-200/-300 Entering a read command ⇒ Enter the read command using the defined structure. C<command number>[<ws>]<LF> The following message is the response: Q<command number><ws><parameter><CR><LF> In this case, <parameter> is the active parameter selected from the parameter list by the corresponding write / action command.
  • Page 139 EFA-200/-300 11 Remote control Error message: “Q<n> FAILED - wrong selected” The data sets selected for data export are unavailable or the selection was not made in ascending order of data set number. ⇒ Check the entries. Error message: “Q<n> FAILED - not implemented yet”...

  • Page 140: Status Messages

    11 Remote control EFA-200/-300 Error message: “Q<n> FAILED - command ignored“ The remote control command was not executed since it does not agree with the device status (e.g. measurement range switching during recording of timer-controlled measurement sequences). ⇒ Check the device status.

  • Page 141: Remote Control Commands

    EFA-200/-300 11 Remote control 11.4 Remote control commands Common commands Write / action Read commands Range of values of p Explanation commands Meaning Activate remote operation REMOTE REMOTE? 0 = local Keyboard is 1 = remote disabled Deactivate remote operation and return to local operation LOCAL –...

  • Page 142: Measurement Settings

    11 Remote control EFA-200/-300 11.4.1 Measurement settings When you use the EFA-TS PC software to remote control the Note: EFA, note the following particulars: In “Exposure STD” mode, you can select the standard to be applied and the measurement range by remote control using the EFA-TS software.
  • Page 143 EFA-200/-300 11 Remote control Write / action Read commands Range of values of p Meaning or units commands of p Select / read E-field measurement range C140 <p> C141 0 = AUTO 1 = 10 V/m 2 = 31.6 V/m...
  • Page 144 11 Remote control EFA-200/-300 Write / action Read commands Range of values of p Meaning or units commands of p Select / read BAND STOP filter (for definition see filter frequencies) C152 <p> C153 0 to 5 Consecutive number within the available list.
  • Page 145 EFA-200/-300 11 Remote control Write/action Read commands Range of p Meaning or commands Unit of p Start measurement C190 – – Stop measurement C192 – – Read measurement status – C 195 0 = Stop 1 = Run Table 11-4...

  • Page 146: Reading Out Current Measurement Values

    11 Remote control EFA-200/-300 11.4.2 Reading out current measurement values For Field Strength and Exposure STD modes only Write / action Read commands Range of values of p Meaning or units commands of p Read measurement value units – C177...
  • Page 147 EFA-200/-300 11 Remote control Write / action Read commands Range of values of p Meaning or units commands of p Continuous transmission of measured values Select / read measured value rate C180 <p> C181 1 to 240 Time interval =...
  • Page 148 11 Remote control EFA-200/-300 Only for Spectrum FFT mode ✓ The “Stop” state should be activated. Write/action Read commands Range of p Meaning or commands Unit of p Marker tool C196 <p> C197 0 = Deactivated NEXT or ESC 1 = Activated Choose marker position C198 <p>...
  • Page 149 EFA-200/-300 11 Remote control Only for Harmonic Analysis mode ✓ The “Stop” state should be activated. Write/action Read commands Range of p Meaning or commands Unit of p List tool C216 <p> C217 0 = Deactivated NEXT or ESC 1 = Activated Read frequency of fundamental –...

  • Page 150: Measurement Data Memory

    11 Remote control EFA-200/-300 11.4.3 Measurement data memory Write / action Read commands Range of values of p Meaning or units commands of p Save data set C220 – – SAVE Clear last data set C222 – – CLEAR LAST...
  • Page 151 EFA-200/-300 11 Remote control Start measurement series immediately – – START IMMED Start measurement series as programmed – – START PGRD Cancel measurement series – – BREAK Read status – 0 = not activated 1 = activated Table 11-11 Remote control commands, timer-controlled measurements...
  • Page 152 11 Remote control EFA-200/-300 Spatially assigned measurements for Field Strength, Exposure STD modes only Write / action Read commands Range of values of p Meaning or units commands of p Change to limitation point “A“ C256 – – GOTO POS A...
  • Page 153 EFA-200/-300 11 Remote control Define / read coordinate ranking in matrix C130 <p> C131 0 = XYZ 1= YXZ 2 = XZY 3 = ZXY 4 = YZX 5 = ZYX Activate / read measured value recording C226 <p> C227...
  • Page 154 11 Remote control EFA-200/-300 Read number of MATRIX data sets – C243 3 0 to 4095 – Read number of data sets LIST – C243 4 0 to 4095 – Read number of data sets VECTOR – Read C243 5 0 to 4095 –...
  • Page 155 EFA-200/-300 11 Remote control Start data export of selected data set type – – – Cancel data export – – – Output device info as header C252 – – – Table 11-13 Remote control commands, exporting data 11-21...

  • Page 156: Optional Functions

    11 Remote control EFA-200/-300 11.4.4 Optional functions “Alarm” function For Field Strength, Exposure STD modes only Write / action Read commands Range of values of p Explanation commands Meaning Activate / read visible alarm function C50 <p> 0 = OFF...
  • Page 157 EFA-200/-300 11 Remote control “Current” function for Field Strength, Exposure STD modes only Write / action Read commands Range of values of p Explanation commands Meaning Define / read current value I REF C260 0 <p> C261 0 0 to 99999.9 Units A, e.g.
  • Page 158 11 Remote control EFA-200/-300 Select / read limit value curve – C105 1 <text><ws><text>_ Max text length = ___<ws>____ = no 5 characters – C105 2 standard – C105 3 – C105 4 – C105 5 – C105 6 Table 11-16 Remote control commands, “Standards” function...
  • Page 159 EFA-200/-300 11 Remote control Filter frequencies for Field Strength mode only Write / action Read commands Range of values of Explanation commands Meaning Bandpass filter: Define / read filter frequency C132 0 <p> C133 0 15.0 to 2000.0 Units: Hz List index: 0 C132 1 <p>...
  • Page 160 11 Remote control EFA-200/-300 Fundamental frequencies for Harmonic Analysis mode only Write/action Read commands Range of p Explanation commands Meaning Bandpass filter: Define/read filter frequency C136 0<p> C137 0 10.0 ... 10000.0 Unit: Hz List index: 0 C136 1 <p>...
  • Page 161 EFA-200/-300 11 Remote control CLOCK Write / action Read commands Range of values of Explanation commands Meaning Select / read clock mode C62 <p> 0 = 24 h Display only 1 = 12 h Select / read data mode C66 <p>...

  • Page 162: General Functions

    11 Remote control EFA-200/-300 Save device settings C172 <p> – 1 to 4 Consecutive number of setup Recall device settings C174 <p> – 0 = Factory Consecutive 1 to 4 number of setup Table 11-22 Remote control commands, device data memory 11.4.5 General functions...
  • Page 163 EFA-200/-300 11 Remote control Read firmware version – C103 1 <version><ws> Version = X.XX <yy-mm-dd><ws> <hh:mm:ss> Read error messages after self test – C103 2 $<error> 4 characters, hexadecimal Read battery charge state – C103 3 0 = OK The remaining...
  • Page 164 11 Remote control EFA-200/-300 Read “Exposure STD” enabled – C107 1 0 = OFF 1 = ON Read “Spectrum FFT / Harmonic Analysis” enabled – C107 2 0 = OFF 5 Hz to 2 kHz 1 = ON Read expanded frequency range enabled (Spectrum FFT / Harmonic Analysis modes only) –...

  • Page 165: Specifications

    12 Specifications All specifications in this chapter apply to both device types unless otherwise indicated. Differing specifications for the B and E field are indicated as follows: • B field: For Basic Unit only (B field) • E field: For E-Field Unit only 12.1 Principle of operation The voltage induced in a measuring coil (probe) is evaluated to measure the magnetic flux density.

  • Page 166: Frequency Range

    12 Specifications EFA-200/-300 12.2.2 Frequency range Broadband (+0/-3 dB), 5 Hz to 2 kHz, 30 Hz to 2 kHz, 5 Hz to 32 kHz, selectable 30 Hz to 32 kHz Bandpass filter 15 Hz to 2 kHz freely definable Resolution 0.1 Hz...
  • Page 167 EFA-200/-300 12 Specifications Dynamic range limit Basic Unit The maximum magnetic flux density that can be measured is twice the measurement range setting. The frequency-dependent overload limit as indicated in figure 12-1 must also be taken into account. Example: The dynamic range limit is 2 mT in the 1 mT measurement range when the 100 cm probe is used (trace 1).

  • Page 168: Measured Value Detection

    12 Specifications EFA-200/-300 Background display level due to intrinsic noise RMS detection mode Typical values: Setting B field unit E-Field Unit (EFA-300 100 cm probe Built-in probe 3 cm probe only) (2245/90.10) (2245/90.20) Broadband, 4 nT 100 nT 20 nT 0.7 V/m...

  • Page 169: Averaging Time / Refresh Rate

    EFA-200/-300 12 Specifications 12.2.5 Averaging time / Refresh rate The averaging time for the RMS value meter is 1 second. The peak value meter indicates the maximum instantaneous value of the vector that occurred during the past 250 ms. The measured values are updated every 250 ms.

  • Page 170: Result Display

    12 Specifications EFA-200/-300 12.2.7 Result display Result display, selectable Instantaneous value (LIVE) or maximum value (MAX) Display mode Digital and analog (bargraph), logarithmic scale Resolution of digital display 4 digits Refresh rate Units, selectable Tesla (T), Gauss (G) (or V/m) 12.2.8 Frequency measurement (Broadband setting only)

  • Page 171: Exposure Std (Shaped Time Domain) Mode

    EFA-200/-300 12 Specifications 12.3 Exposure STD (Shaped Time Domain) mode 12.3.1 Brief description • Measurement of the magnetic flux density or electric field strength based on a broadband measurement with simultaneous consideration of the limit curve corresponding to the chosen setting.

  • Page 172: Limit Value Curves

    • BGV01 2H/D • ICN98 GNPUB ICNIRP Guidelines, April 1998 • ICN98 OCCUP • VDE01 VDE 0848, Draft Stage, July 2001 The available curves can be updated if needed using the Note: “EFA-200/-300 Tools” software. Transferring STANDARDS parameters: siehe Seite 10-8 12-8...

  • Page 173: Measurement Value Detection

    EFA-200/-300 12 Specifications 12.3.5 Measurement value detection Detection RMS and vectorial peak value are determined simultaneously and evaluated according to the selected limit value curve. Evaluated measurement axes 3-dimensional (isotropic), X, Y or Z 12.3.6 Averaging time / Refresh rate The averaging time for the RMS value meter is 1 second.

  • Page 174: Result Display

    12 Specifications EFA-200/-300 12.3.8 Result display Result display, Instantaneous value (LIVE) or maximum value selectable (MAX) Display type Digital and analog (bargraph), logarithmic scale Digital display resolution 4 digits Refresh rate Units Percent (%) 12.3.9 Additional functions Alarm function, visible and...

  • Page 175: Frequency Range

    EFA-200/-300 12 Specifications 12.4.2 Frequency range Range, selectable 5 Hz to 2 kHz 40 Hz to 32 kHz Resolution, internal 1 Hz 10 Hz Time window of ongoing 1 sec, overlapping 100 ms sampling 12.4.3 Measurement range Nominal measurement range Measurement range, 100 nT to 31.6 mT...
  • Page 176 12 Specifications EFA-200/-300 Dynamic range limits B-Field Unit The maximum magnetic flux density that can be measured is twice the measurement range setting. A frequency-dependent overload limit as per Fig. 12-1 must also be taken into account. Example: The dynamic range limit is 2 mT in the 1 mT measurement range when the 100 cm probe is used (trace 1).
  • Page 177 EFA-200/-300 12 Specifications Background display level due to intrinsic noise and interference Detection mode: RMS Typical values: Setting B field unit E-Field Unit (EFA-300 100 cm probe Built-in probe 3 cm probe only) (2245/90.10) (2245/90.20) 5 Hz to 2 kHZ <...

  • Page 178: Recording Of Measured Values

    12 Specifications EFA-200/-300 12.4.4 Recording of measured values The following detection modes can be selected: • ACT RMS: actual root mean square value • AVG RMS: averaged root mean square value • VECT PEAK: peak value, true phase for each spectral component 12.4.5 Averaging / measured value rate...

  • Page 179: Result Display

    EFA-200/-300 12 Specifications 12.4.6 Result display • Spectrum (measured value, frequency) Graphical display • Units of decibels (dB) and reference value (T, G or V/m) • Logarithmic division (like frequency range) Zoom of frequency ranges, • Linear division (scale size: 100 Hz or 1 kHz) selectable •...

  • Page 180: Brief Description

    12 Specifications EFA-200/-300 12.5.1 Brief description • Measurement of the magnetic flux density or electric field strength based on spectrum analysis through a Fast Fourier Transformation. • Determination of the exact fundamental frequency by entering an approximate value • Measurement of the field strength of the fundamental and harmonics.

  • Page 181: Miscellaneous

    EFA-200/-300 12 Specifications 12.6 Miscellaneous 12.6.1 Display type and warning devices Basic Unit only Display type LCD dot matrix, with backlight Visible warning Red LED Audible warning Built in beeper 12.6.2 Data memory Both the basic unit and the E-Field Unit are equipped with a data memory.

  • Page 182: Brief Description

    12 Specifications EFA-200/-300 12.6.2.1 Brief description • Measured values, all relevant instrument settings and a date/time stamp are stored in a data set for each save action. • Control of save actions and the contents of the data set depend on the selected operating mode.

  • Page 183: Device Settings Memory

    EFA-200/-300 12 Specifications 12.6.3 Device settings memory User defined settings for all available operating modes are stored in four independent memories. 12.6.4 Self test Automatic self test after switch-on: • Warning function • Converter test • Memory test • Operating voltage test 12.6.5 Remote control interface (serial)

  • Page 184: Power Supply

    12 Specifications EFA-200/-300 12.6.6 Power supply 12.6.6.1 Battery operation Basic Unit only Built-in exchangeable NiMH 5 size C (Baby), IEC R14 batteries Operating life with Typically 10 hours rechargeable batteries at 23 °C Measurement sequence, Typically 24 hours timer-controlled Charging time for...

  • Page 185: Charger Unit

    EFA-200/-300 12 Specifications 12.6.6.2 Charger unit Type SNT-91, BN 2259/92.01 or BN 2259/92.02 Nominal voltage range 100 to 240 V AC Nominal voltage range Automatic switching AC line frequency, operating 47 to 63 Hz range 12.7 General specifications 12.7.1 Climatic environment conditions...

  • Page 186: Conformance Marks

    12 Specifications EFA-200/-300 Selected climatic parameters Storage Transport Operation Temperature -5 °C to +45 °C -30 °C to +70 °C 0 °C to +50 °C briefly: -10 °C to +50 °C With AC adapter / charger: +5 °C to +40 °C...

  • Page 187: Dimensions And Weight

    (including Field Strength and Exposure STD modes) • Basic Unit • SNT-91 charger • Transport bag • Opto-electrical adapter • Fiber optic cable (2 m) • Software EFA-200/EFA-300 Tools • Operating manual 2245/30 EFA-300 (including Field Strength and Exposure STD modes) • Basic Unit •...

  • Page 188: Options

    Order number Spectrum FFT and Harmonic Analysis modes (5 Hz ... 2 kHz) 2245/95.10 Spectrum FFT and Harmonic Analysis modes (5 Hz ... 32 kHz) 2245/95.15 Calibration report, EFA-200 2245/91.02 Calibration report, EFA-300 2245/91.03 Precision B-Field Probe, A=100 cm² 2245/90.10 B-Field Probe, D=3 cm 2245/90.20...
  • Page 189 Annex A: Glossary Measurement axes (isotropic / single axis measurement) The measurement of the magnetic flux density / field strength present at a given point requires the determination of the field strength components in the three orthogonal vector directions. These three mutually perpendicular measurement axes are normally designated as x, y and z respectively.
  • Page 190 Annex A: Glossary EFA-200/-300 Peak value (VECT PEAK) B ˆ The peak value of the magnetic flux density is calculated from the variation in time B (t) through B (t) of the magnetic flux densities in the three measurement axes.
  • Page 191 EFA-200/-300 Annex A: Glossary These criteria can be summarized and lead to an evaluation expressed as a percentage. (Note: Envisaged in the standards, compare “Summation formula”) The EFA is equipped with a suitable automatic evaluation function. This takes account of the variation with frequency of the limit values as well as the prescribed measurement of the RMS and peak values.
  • Page 192 Annex A: Glossary EFA-200/-300 Figure A-2 Typical response of BANDPASS filter with filter frequency f = 100 Hz For other filter frequencies, multiply the frequency axis by f / 100 Hz. Example of measurement uncertainty for a small frequency deviation:...
  • Page 193 EFA-200/-300 Annex A: Glossary Figure A-3 Typical response of BANDSTOP filter for filter frequency f = 100 Hz For other filter frequencies, multiply the frequency axis by f / 100 Hz. The selective filters from 16.7 Hz through to 50 Hz and 60 Hz (AC line frequencies) up to 180 Hz are suitable for determining the fundamental and harmonic fields caused by public power supply utilities.
  • Page 194 Annex A: Glossary EFA-200/-300 A display value of 0 dB corresponds exactly to the reference value shown in display field F1. The position of the reference value can be shifted along the measured value axis with Y POS. The display scale of the measured value axis can be modified with Y SCAL.
  • Page 195 Annex B: Determining the matrix Defining the spatial area and spatial points The actual space within which the measurement is to be made (e.g. an office or the area around a transformer station) is represented by a coordinate space. Every point in this space can be described exactly by means of a set of coordinates.
  • Page 196 Annex B: Determining the matrix EFA-200/-300 Organizing data The area under investigation is traversed systematically within the spatial limits during the measurement. Any direction can be chosen and this can be altered at any time. A measurement value is recorded along with the displayed coordinate value by pressing a button at each point in the space that is of interest.
  • Page 197 Annex C: Fundamentals of FFT In Spectrum FFT mode, spectrum analysis is performed using a Fast Fourier Transformation (FFT). This is based on recording of the signal shape (“sampling”), following by computation. The individual steps are as follows: Sampling The signal shape is monitored for each active measurement axis (isotropic or single channel) over a certain time period (“time window”) and internally represented through ongoing sampling.
  • Page 198 Annex C: Fundamentals of FFT EFA-200/-300 Averaging of the resulting spectrum In the ACT RMS and VECT PEAK detection modes, each computed spectrum is used for evaluation. In the AVG RMS detection mode, a selectable number (averaging parameter NAVG) of successive power spectra are averaged. Larger averaging parameters result in a reduction of the noise shown on the screen and allow you to read off smaller measurement results.
  • Page 199 Annex D: Data export format Exporting data: see page 7-16 Exported data are available as *.txt or *.csv files. Individual data items are separated using the separator chosen for the export operation. Each export document is preceded by an information block summarizing the device data.
  • Page 200 Annex D: Data export format EFA-200/-300 Exported measurement data Field Strength mode • Data set type NORMAL Parameter Code Values Data set number MEM# Number Data set type N = Normal Probe used PROBE INT_PRB = Internal probe EXT_PRB_1 = Probe 100 cm²...
  • Page 201 EFA-200/-300 Annex D: Data export format • Data set type AUTO (differences with respect to data set type NORMAL) Data set type A = AUTO Index in data set Number Time step STEP hh:mm:ss • Data set type MATRIX (differences with respect to data set type...
  • Page 202 Annex D: Data export format EFA-200/-300 • Data set type AUTO (differences with respect to data set type NORMAL) Data set type A = AUTO Index in data set Number Time step STEP hh:mm:ss • Data set type MATRIX (differences with respect to data set type...
  • Page 203 EFA-200/-300 Annex D: Data export format Display mode LIVE Spectral value, unit VALUE [x] Number T = Tesla G = Gauss Validity indicator VALID !A = Computation incomplete !O = Overdriven Harmonic Analysis mode • Data set type LIST Parameter...
  • Page 204 Annex D: Data export format EFA-200/-300 Total noise/harmonic KN [%] Number factor Validity indicator VALID !A = Computation incomplete !O = Overdriven...
  • Page 205 EFA-200/-300 Locations of all controls and display elements Display Keypad Serial optical interfaces: to PC to E-Field Unit Connection to ext. B-Field Probe...
  • Page 206 Notes:...
  • Page 207 Index Access codes 10-10 Data ACT RMS 6-15, 6-28 displaying 7-14 ALARM 4-6 exporting 7-16 activating 8-1 saving 7-1 Applications 1-1 Data pool 7-10 AUTO 6-2, 7-3 Data set 7-14 Averaging 6-15, 6-27, 8-7, A-2 Date 8-9 Default setting 4-4, 9-1 Detection mode 6-3 Device data memory 9-1 B MEAS UNIT 8-7...
  • Page 208 FACTORY 9-1 Keyboard 4-1 Fast Fourier Transformation 5-4, 6-13, C-1 Faults 3-11, 7-2, 7-6, 7-13, 10-3, Light 4-4, 4-5 11-4 Limit curve 6-24, 8-5 Features 1-1, 1-2 Limit value curve 6-9 FFT 6-13, C-1 LIVE 6-4, 6-10, 6-15, 6-28 Fiber optics cable 3-8, 11-1 LOW BATTERY 3-2 Field probes A-1 Field strength 6-1...
  • Page 209 MODE 4-4, 6-2, 6-9, 6-13, 6-26 RMS value 6-3, 6-15, 6-28, A-1 RUN 4-1 NAVG 8-7 Navigation keys 4-2 Safety instructions 2-1 NEXT 4-2 SAVE 4-2 NOT ENOUGH MEMORY 7-6, Selection filters A-3 7-13 SERVICE 10-11 SHOW 7-14 SNT 2-2 Software 10-5 ON 4-6, 4-7 Specifications 12-1...
  • Page 212 Narda Safety Test Solutions GmbH Sandwiesenstraße 7 72793 Pfullingen, Germany Phone: +49 7121-9732-777 Fax: +49 7121-9732-790 E-mail: support@narda-sts.de www.narda-sts.com Narda Safety Test Solutions 435 Moreland Road Hauppauge, NY 11788, USA Phone: +1 631-231-1700 Fax: +1 631-231-1711 E-mail: NardaSTS@L-3COM.com www.narda-sts.us Narda Safety Test Solutions Srl...

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