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Summary of Contents for MPB SEMS
- Page 1 MPB S.r.l. Tel +39 0641200744 Via Giacomo Peroni 400/402 Fax +39 0641200653 00131 ROMA (RM) info@gruppompb.com www.gruppompb.com User’s manual SEMS Shielding effectiveness measurement system MPB 2010 ver. 2_0...
- Page 2 S E M S SAFETY NOTE Read before using the product MPB works to provide to its customers the best safety conditions available complying with the current safety standards. The instrumentation described in this manual has been produced, tested and left the factory in conditions that fully complying the European standards.
- 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 Directives: EMC 89/336/EEC and Low Voltage 73/23/EEC) This is to certify that the product: SEMS (Measurement system of shielding effectiveness)
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Page 4: Table Of Contents
3.3. Menu Spt 3.4 Measuring the shielding attenuation 3.5 Calibration using CalKit 3.6. How to use the active bridge 3.7. Measurement with Rod antennas mod. R1 4. SEMS PC Utility software, controls and functions 4.1. Installation 4.2. Archive Mode 4.3. List Mode 4.4. -
Page 5: General Information Pag
S E M S 1. 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: Standard Accessories
4) 2 loop antennas (2…128 MHz) 5) 2 RS232/wireless 6) 2 Battery chargers 7) Active bridge at 2.4GHz 8) PC Utility SEMS software 9) Cal Kit and SIT calibration certificate 10) User’s Manual 11) RS232 cable and RS232-USB adapter 12) Instrumentation case Picture n°02... -
Page 7: Receiver Front Panel
Power button Picture n°03 1.6. Transmitter front panel The SEMS transmitter (Picture n° 04) has no command button but a power button, since the commands are sent by the receiver using the wireless connection. RF out 50 Ohm N female connector Power button Picture n°04... -
Page 8: Receiver/Transmitter Rear Panel
USER’S MANUAL S E M S 1.7. Receiver / Transmitter rear panel The rear panels (Picture n° 05) are equals 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 9: Technical Specifications
USER’S MANUAL S E M S 1.8. Technical specifications SEMS Frequency range for TX/RX 10 kHz…300 MHz Resolution 10 Hz 50 Ω, N fem. RF out (TX module) Max output power (typical) +30 dBm 50 Ω, N fem. RF in (RX module) VSWR <... -
Page 10: Operating Principle
USER’S MANUAL S E M S 2. 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 11: Sems System
S E M S 2.3. SEMS System The main purpose of the SEMS is to measure the shielding effectiveness in a shielded environment by measuring the attenuation of the electric or magnetic field. We can briefly describe the operating principle as it follows:... -
Page 12: System Use And Operation
On the top right of the screen will appear a battery icon to show the charge status of the RX module, after the TX connection on the top left will appear the TX device battery icon. SEMS FW – 1.XX XX/XX/XX NOTE: As soon as the connection is estabilished, if the red led of the wireless devices blink together with the yellow ones, wait untill the complete switching off of the first ones in order to let the devices synchronize and ensure the correct functioning. -
Page 13: Cal Menu
(L_Lo, L_Hi e Bic) or the user’s customized bands pressing the User button (customized bands are programmed with the “SEMS PC_Utility” software) SEMS Ready for Measuring... - Page 14 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 list button will appear a new menu where you can select the default frequency list DFT or three programmable lists (L1, L2 e L3)
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Page 15: Show Menu
The show menu will provide the results of measurements performed and previously stored To see the saved measurements press the Show button SEMS Ready for Measuring Meas Show Cal e.g. We will choose a measure stored in a memory named H1-4... - Page 16 USER’S MANUAL S E M S Then we recall the H1 memory SEMS Ready for Measuring 1stF Shows the attenuation at the lower frequency of the selected scan or list NxFr Shows the attenuation on the next frequency HiPk Shows the minimum attenuation on the whole scan or list...
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Page 17: 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 (3.1.1. of this manual). SEMS Ready for Measuring Meas Show Cal The command will perform a measurement of attenuation automatically (Auto), or manually (Man). - Page 18 USER’S MANUAL S E M S 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. This feature can be used as a modality of RF leaks(sniffer) in order to identify weaknesses in the shielding of the room.
- Page 19 USER’S MANUAL S E M S By pressing the H-1 button the data will be stored and you will go back to the starting screenshot. - 19 -...
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Page 20: Wiz Menu
3.2. WIZ menu To improve the managing of 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 21: 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). - 21 -... - Page 22 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 23 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 24 USER’S MANUAL S E M S 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. The Redo button repeats the measurement for the selected spot shown in the screen, as soon as this operation is completed the display will show the same screenshot with the updated value of the maximum attenuation.
- Page 25 Use arrows for 10 dB step Using the up and down arrows on the SEMS keyboard is possible to move the threshold by 10 dB, to set a more fine value is possible to press the +1 and -1 buttons to increase or decrease the threshold by 1 dB.
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Page 26: 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 27: Calibration Using Calkit
S E M S 3.5. Calibration using Calkit The SEMS needs a periodic linearity calibration, the Cal-Kit can easily and precisely accomplish this purpose. If required the Cal-Kit can be provided with SIT calibration. To start the calibration procedure press Cal button from the main menu and press CalK button, then calibration can be performed following the instructions on display. - Page 28 USER’S MANUAL S E M S 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...
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Page 29: How To Use The Active Bridge
USER’S MANUAL S E M S 3.6. How to use the active bridge The active bridge is developed to improve the connection between Tx and Rx, this is very useful when the shielding that is tested is too high to ensure the direct wireless connection between the devices (2.4GHz), using the wireless/optical cable adapter you can solve the problem allowing the regular performing of the test. -
Page 30: 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 (image n.09) WARNING: not using the attenuator can cause serious troubles to the system functionality. -
Page 31: Sems Pc Utility Software, Controls And Functions
After the installation the software is ready to use Options menu SEMS PC Utility starts from the desktop icon or from start / Programs. The program has two working modes: Archive shown at the program start up and List, in archive mode is possible to load files and show measurements, in the list mode is possible to create and send to the receiver the list of frequencies for customized measurements. -
Page 32: Archive Mode
You can change the scale by double clicking on the maximum and minimum value in the graphic. (*) In addition to RS232 connection, you can connect the SEMS receiver to the PC using the wireless device, the connection takes place between the SEMS receiver wireless and the PC wireless. -
Page 33: List Mode
Clicking on the List button, on the right bottom of the window, the second working mode will be activated. Here you can find how to create a frequency list to upload in the SEMS as customized frequencies: For an automatic table creation press the Scan button after Start Freq. , Stop Freq. -
Page 34: Receiver Firmware Upgrading
USER’S MANUAL S E M S 4.4. Receiver firmware upgrade Recharge the receiver batteries and connect it to the PC using RS232 cable. Turn on the Rx, run the SEMSPC_Utility software and set the COM port in the Option menu pressing Select Comm. To verify the assignation of the COM port assigned by the PC check in the control panel, System, Hardware, peripheral, ports. - Page 35 S E M S It will show the upgrade window: 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 completes, close the “Form1” window and turn off the receiver.
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