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MPB SEMS User Manual

Shielding effectiveness measurement system
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MPB S.r.l.
Via Giacomo Peroni 400/402
00131 Rome - Italy
SEMS & SEMS LIGHT
Shielding Effectiveness Measurement
Updated to the software Version:
SEMS RX 1.32
SEMS TX 1.05
SEMS PC Utility 1.26
MPB 2014 ver. 2_9
User's manual
System
Tel +39 0641200744
Fax +39 0641200653
info@gruppompb.com
www.gruppompb.com

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  • Page 1 Tel +39 0641200744 Via Giacomo Peroni 400/402 Fax +39 0641200653 00131 Rome - Italy info@gruppompb.com www.gruppompb.com User’s manual SEMS & SEMS LIGHT Shielding Effectiveness Measurement System Updated to the software Version: SEMS RX 1.32 SEMS TX 1.05 SEMS PC Utility 1.26...
  • Page 2 To maintain it in safe conditions and ensure the correct use, these general instructions must be fully understood and applied before using the product. The SEMS is designed for industrial environment and laboratories and should be used by skilled staff only.
  • Page 3 C o n f or m i t y C e r t i f i c a t e (in accordance with the ISO/IEC 17050-1) This is to certify that the product: SEMS / SEMS LIGHT (Measurement system of shielding effectiveness)

  • Page 4: Table Of Contents

    3.6. Calibration using CalKit 3.7. Measurement with Rod antennas mod. R1 3.8. Unconnected mode 3.9. Prequiet mode 3.10.SEMS Light 4. SEMS PC Utility software, controls and functions 4.1. Installation 4.2. Connecting the instrument 4.3. Retrieving a measurement 4.4. Program a frequencies List with Scan or table List 4.5.

  • Page 5: Introduction

    S E M S General information 1.1. Introduction SEMS is thought to comply the raising need to test and verify the shielding effectiveness of shielded environment in hospitals and industries. This system allows to measure automatically with high speed and accuracy the attenuation value of the magnetic and electric field in shielded environments.

  • Page 6: Composition Of The System And Optional Accessories

    ¡ ¡ Dipole antennas Mod. D1 (40…300MHz) ü ü RS/232 Wireless Key Bluetooth technology ü ü RS232/USB cable to download memory of the SEMS and for programming ü ü Battery Charges ü ü Carrying bag Mod. SEMS-CC ü ü Antenna adapters N(m)-N(m) ¡...
  • Page 7 USER’S MANUAL S E M S TIPS TO HAVE THE BEST DYNAMIC DYNAMIC WITH DIPOLE ANTENNA MODEL D1 WITH DIPOLE ANTENNA MODEL D1 Frequency range Extended [MHz] element 200-300 140-240 90-180 0+1+2 70-140 0+1+2+3 40-120 0+1+2+3+4 - 7 -...

  • Page 8: Receiver Front Panel

    Picture n°03 1.5. Transmitter front panel The SEMS transmitter (Picture n° 04) has no command button but only a power button and a led to indicate that the transmission is active, since the commands are sent by the receiver using the wireless connection.

  • Page 9: Receiver/Transmitter Rear Panel

    USER’S MANUAL S E M S 1.6. Receiver / Transmitter rear panel The rear panels (Picture n° 05) are the same for both devices and upon them is possible to find the serial number, the thread used for the tripod, the battery charger connector and the RS232 interface for the wireless link.

  • Page 10: Technical Specifications

    USER’S MANUAL S E M S 1.7. Technical specifications Frequency range for TX/RX 10 kHz…300 MHz (SEMS Light up to 96 MHz) Resolution 10 Hz 50 Ω, N fem. RF out (TX module) Max output power (typical) +30 dBm 50 Ω, N fem.

  • Page 11: Operating Principle 2.1. Sems Receiver

    USER’S MANUAL S E M S Operating principle 2.1. SEMS Receiver The block diagram (a) below represents the SEMS receiver. Digital > Filters > > Display Attenuator Figure a) First of all the RF signal received by the antenna is attenuated by the attenuator module to fit the level to the next modules specifications, subsequently we can find the filters to select the bandwidth depending on the frequency settings.

  • Page 12: Sems System

    2.4. Power saving and recalibration The SEMS has an integrated timer in both RX and TX unit for two different reasons: the TX automatically turns off after 17 min of idle to save the battery; the RX unit after 15 min from the last zero setting suggests to recalibrate the SEMS by repeating the procedure.

  • Page 13: System Use And Operation 3.1. Turn On Menu

    “If the battery icon do not appear on the top left, there isn’t communication from the units. Please check the configuration of the wireless Bluetooth” (Ind 3.5-page 32) SEMS FW – 1.32 27/03/14 HW-2 NOTE: As soon as the connection is established, if the red led of the wireless...

  • Page 14: Cal Menu

    (L_Lo, L_Hi e Bic) or the user’s customized bands (Sc1,Sc2,Sc3 and Sc4)pressing the User button (customized bands are programmed with the “SEMS PC_Utility” software) SEMS Ready for Measuring...
  • Page 15 USER’S MANUAL S E M S SEMS Ready for Measuring List performs the system zeroing process using the default or programmable frequency list, by pressing the list button will appear a new menu where you can select the default frequency list DFT or three programmable lists (L1, L2 e L3)
  • Page 16 (radio frequency disturbance) at the same frequencies of the test, that could compromise the dynamic of the measure It’s possible make a scanning in automatic or manual mode just press the Stp menu like show below: SEMS FW – 1.32 27/03/14 HW-2 BEEP Clear...
  • Page 17 In this example the operator will know immediately how much dynamic will be available during the measure at the frequency of 9,900001 MHz. Confirming with “OK” the SEMS Receiver will proceed at the next frequency through the activation of the “Best Dynamic” function like below: For every frequency present in the table two additional side frequencies are added: the lower is f*0.99 (-1%) and the higher is f*1.01 (+1%)
  • Page 18 USER’S MANUAL S E M S You can at anytime stop the “Best Dynamic” function Pressing the “Abort” button will show the menu below Sems UnZeroed Calibration Aborted ** Above Minimum ** Show Anyway, you can view all the values of dynamic available for each frequency point with the command “Show”, before to start the measuring:...
  • Page 19 USER’S MANUAL S E M S To view them one by one press the button NxFr ( Next frequency) or HiPk ( highest Peak) and NxPk ( next Peak than the one displayed) Dynamic 9.900 to 126.000 1stF NxFr HiPk NxPk - 19 -...

  • Page 20: Show Menu

    3.2.3. Show menu The show menu will provide the results of the measurements performed and previously stored To see the saved measurements press the Show button SEMS Ready for Measuring Meas Show Cal Snif e.g. We will choose a measure stored in a memory named H1-4...

  • Page 21: Meas Menu

    You can find the Meas command in the Std menu, but it will appear only when the system is zeroed using the Cal command described in the previous paragraph (3.2.1. of this manual). SEMS Ready for Measuring Meas Show Cal...
  • Page 22 Using the automatic mode you can choose if you want the measurement procedure to start immediately (Now), or with a fixed time delay (10s, 30s, e 60s). SEMS Ready for Measuring If you use a manual measurement you will use the commands: (Prev) measure of the previous frequency, (Next) measure of the next frequency, (Redo) in order to measure the current frequency and (Abort) to end the measurement.To measure...
  • Page 23 USER’S MANUAL S E M S When the measurement is finished the display will show the memory slot to store the acquired data, you can choose one of the 4 memories for each frequency range: Frequency Range from 0.01 to 2 MHz = memory (L-1, L-2, L-3 e L-4) Frequency Range from 2 to 60 MHz = memory (M-1, M-2, M-3 e M-4) Frequency Range from 60 to 300 MHz = memory (H-1, H-2, H-3 e H-4)
  • Page 24 TX Tuned and Ready to 144.210005 Next Prev Meas By pressing Meas the SEMS will start measuring the shielding effectiveness on the selected frequency, displaying the current attenuation, along with the maximum and minimum value in brackets. 144.210005 MHz (112.4 : 134.4) Att:120.1 dB...
  • Page 25 USER’S MANUAL S E M S By pressing Clear the maximum and minimum values are reset, and by pressing Stop you will halt the measure. 144.210005 MHz Sniffing terminated (112.4 : 134.4) Meas Show Cal Snif By pressing Snif again you can restart the sniffing sequence or select a different frequency.

  • Page 26: Wiz Menu

    WIZ menu To improve the management of the measurement saving procedure you can use the SEMS’s wizard for a better organization of data storage. To use the wizard press the WIZ button in the top menu of the device. The wizard...

  • Page 27: Measurements Using Wizard

    Antenna 1 (Zero) Scan List Selecting “Scan” we can choose to zeroing the system using the default mode (L_Lo - L_Hi - BIC) or to use the span programmable by the “SEMS PC_Utility” software mode (User). - 27 -...
  • Page 28 USER’S MANUAL S E M S Choose the range for Antenna 1 (Zero) L_Lo L_Hi User As soon as the zeroing procedure is completed, the measurement screenshot will appear on the display. In this screenshot the user has to decide how to perform the measurements: automatically (Auto), or manually (Man).
  • Page 29 USER’S MANUAL S E M S When the manual mode is selected , the user has to choose the commands: (Prev) to measure the previous frequency, (Next) for the next frequency, (Redo) to repeat the measurement on the current frequency or (Abort) to quit. 60.000000 MHz Rbw:40 Hz.
  • Page 30 USER’S MANUAL S E M S The Next button must be pressed to get to the next spot. If all the required spot have been measured, the procedure automatically switches to the next pair of antennas and shows again the auto zeroing screenshot. If you used all the antennas systems that you selected , the procedure is over and it will return to the main screenshot with a success message about the data storing.

  • Page 31: Stp Menu

    Use arrows for 10 dB step Using the up and down arrows on the SEMS keyboard is possible to move the threshold to 10 dB, to set a more fine value is possible to press the +1 and -1 buttons to increase or decrease the threshold to 1 dB.
  • Page 32 USER’S MANUAL S E M S While the measured value remains under the threshold the buzzer will produce a fast series of beeps, when the measured value returns over the threshold the buzzer will be still beeping but with a slower series of sounds. The OFF button will take the sound off.

  • Page 33: Measuring The Shielding Attenuation

    7) As the measure ends save the result in a memory. 8) Repeat the 5, 6 and 7 steps for each measurement spot. 9) After all the spots are measured download the results on a PC using SEMS PC Utility software provided with the product.

  • Page 34: Calibration Using Calkit

    USER’S MANUAL S E M S 3.6. Calibration using Calkit The SEMS needs a periodic linear calibration, the Cal-Kit can easily and precisely accomplish this purpose. If required the Cal-Kit can be provided with Accredia calibration. To start the calibration procedure press Std/Cal button from the main menu and press CalK button, then calibration can be performed following the instructions on the display.
  • Page 35 USER’S MANUAL S E M S When the calibration is done the following screenshot will be shown Calibration done Worst: 0.70 dB 20.000 kHz (120 dB) Show Cal The “Worst” parameter shows the worst accuracy over frequencies (in this case is 0.7 dB at 20.000kHz) typically is a parameter that you can find in the technical specifications of the chamber: 10 kHz...

  • Page 36: Measurement With Rod Antennas Mod. R1

    3.7. Measurement with Rod antennas mod. R1 When using Rod antennas( in the zero setting and in the measurement phase) it’s absolutely necessary to connect the SEMS TX 10 dB attenuator ,already supplied, before connecting the Rod antenna (picture n.09) WARNING: not using the attenuator can cause serious troubles to the system functionality.

  • Page 37: Unconnected Mode

    In this operating mode, during the measurement, there’s no need of a connection between the RX and TX unit. To use this operating mode the SEMS RX must be programmed (through the SEMS Software) with a specific list of no more than 20 frequencies.
  • Page 38 USER’S MANUAL S E M S As soon as the zeroing sequence ends press Meas: SEMS Ready for Measuring Auto PreQ Unc Place the TX and RX units in the desired measurement spot and press the Unc button to enable the two units to synchronize their internal clock.
  • Page 39 USER’S MANUAL S E M S You’ll see a countdown starting from a value that can vary according to the moment in which you started the measurement and the number of frequencies you entered in the list. 5.000000 MHz Sync in 12 s Abort After the first measurement you’ll see that before each frequency there is a synchronization delay.
  • Page 40 USER’S MANUAL S E M S If you need, you can start another measurement by selecting Meas again: SEMS Ready for Measuring Auto By pressing Auto you can begin a new measurement without reconnecting the two units. However, you can do this only for a fixed period of time (see below).
  • Page 41 USER’S MANUAL S E M S Place the TX and RX units in the desired measurement spots and press the Unc button to enable the two units to synchronize their internal clock. Note that you have to make this step while the 2 batteries are visible on the LCD display Remove Connections...
  • Page 42 USER’S MANUAL S E M S After the first measurement you’ll see that before each frequency there is a synchronization delay. 10.000000 MHz Sync in 2 s Att:88.0 dB Abort As soon as the measurement ends you’ll see the usual “Spot Done” screen from Wizard mode, where you can repeat the measurement (ReDo) or start measuring the next (if there is one) spot (Next).
  • Page 43 USER’S MANUAL S E M S If the connection is successful you’ll see the following screen: Sync OK Remove Connections Abort Now you are able to start the measurement, the 14 minutes timer is restarted. If the connection fails (keep in mind that after 17 minutes the TX Unit turns off automatically) you will see the following screen: Synchronizing Transmitter...

  • Page 44: Prequiet Mode

    To avoid this the SEMS has a cleaning function called Prequiet Mode. In the Prequiet Mode the SEMS RX modifies the working frequencies so that the environmental noise is kept out of the measurement points.
  • Page 45 S E M S As soon as the quieting procedure finishes you can start the measurement. Quieting Terminated Meas Show Cal Snif By pressing Meas and starting a measure, the SEMS will automatically use the optimized frequency list. - 45 -...

  • Page 46: Sems Light

    FW – 1.32 27/03/14 HW-Light The SEMS LIGHT has the same functions and performances than SEMS. The only limit is on the max frequency until 96 MHz In the Stp menu it’s possible upgrade the RX Unit (through the activating code ) from SEMS LIGHT to SEMS,so you can working until 300 MHz.
  • Page 47 USER’S MANUAL S E M S After you unlock the SEMS LIGHT the display will show: Code saved Turn the SEMS OFF then on again Abort And then you will be ready to measure until 300 MHz. - 47 -...

  • Page 48: Functions 4.1. Installation

    4.1. Installation 4.2. Insert the USB Drive that came along with your SEMS system into the PC you are installing the software to. Launch the setup file (SEMS SW.exe) and click YES in the pop up window (Vista and Seven users only): According to your computer settings, SEMS SW Installer will have on screen instruction in different language.

  • Page 49: Connecting The Instrument

    Press the Enter key on your keyboard to confirm. The program should be now correctly configured to communicate with the SEMS RX unit. Note: Please use the driver version that comes with the SEMS for the USB to Serial interface. - 49 -...

  • Page 50: Retrieving A Measurement

    TXT file with the report will be created). By clicking on the desired element and then pressing Retrieve data will be downloaded from the SEMS internal memory and shown on the main window (you will be asked to save an optional record file for latter reference)
  • Page 51 USER’S MANUAL S E M S To retrieve a single measure access the option from the relative menu (Tools -> Retrieve -> Single Measure) and select the desired measure from the popup window: Clicking retrieve will update data currently shown on the screen with the retrieved measure and allows you to save the measure as a record file (SMR).
  • Page 52 USER’S MANUAL S E M S Retrieving a set of measures works in a similar fashion. To retrieve all data relative to a chamber you have to click on Retrieve -> Set of Measure from the Tools menu, then select the dataset from the pop up window. In this example, we are retrieving data from Chamber B, Range 1.
  • Page 53 S E M S As the download finishes you are not prompted to save your data: this is because SEMS automatically saves sets of measures inside its own work folder. To consult all data inherent to the chamber, just click File -> Load Inside “Chamber B”...
  • Page 54 S E M S 4.4. Programming a frequencies list with List or Scan In the menu List, of the SEMS PC Software, it’s possible programming a list of frequencies or a scanning and store them inside RX unit: The picture below is the menu for programming...
  • Page 55 USER’S MANUAL S E M S Otherwise, if you want to make a frequencies list, just click in the “List” and edit the frequency To make a frequencies List, you must select the “Insert” button, write the frequency value in the near area and push again the “insert” button. Proceed in the same way to modify or remove a frequency value.
  • Page 56 USER’S MANUAL S E M S Note: During programming, to enable the functions: “Unconnected Mode” Make max 20 Frequencies “HiDyn-Mode Make max 30 Frequencies - 56 -...
  • Page 57 USER’S MANUAL S E M S 4.5. Working with the results · The color of the graphic can be changed from Options -> Graphic Color. · The axis reference can be modified by double clicking the maximum and minimum value of the axis and inserting the desired value. ·...

  • Page 58: Firmware Upgrade

    PC using RS232 cable. the PC using RS232 cable. Turn on the unit, run the SEMS , run the SEMS Software and set the COM port in the Option menu oftware and set the COM port in the Option menu pressing Select Comm.
  • Page 59 USER’S MANUAL S E M S The updatable file (SemsFw.ldr) should be located in the SEMS software directory. Press the “Update Firmware” button and wait for the loading. When the upgrade is completed, close the window and turn off the receiver.

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