GTEMCELL GTEM For emissions and immunity testing
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- Cornelius Johns
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1 GTEMCELL GTEM-1500 For emissions and immunity testing Introduction The GTEM (Gigahertz Transverse Electro Magnetic) cell is a low-cost alternative measurement facility for both radiated emission and immunity measurements. In principle the GTEM cell is a coaxial line expanding pyramidally at its end terminated by a combination of broadband resistors and RF absorbers designed and constructed to match an impedance of 50 Ohms. It is included in the recently published standard IEC/EN Emission and Immunity Testing in Transverse Electromagnetic (TEM) Waveguides. Compared to other measuring methods like EMC test in anechoic chambers or OATS (Open Area Test Sites), GTEM-cells offer some significant advantages for the testing of small and medium sized EUT s (Equipment Under Test) up to a frequency range of 20 GHz. Quick turnarounds of the EUT as well as numerous testing variations are easy and fast to handle. Switching from emission to immunity testing requires only simple adjustments from receiver input to amplifier output. You are irrespective of long waiting times associated with off-site test labs or weather and ambient delays that can occur at OATS facilities. Whether you are at the design qualification, pre-compliance, compliance, or production sampling stage, the GTEMCELL is the right choice for you!.
2 GTEM 1500, door Left side Emissions and immunity testing in a single, shielded environment Meet basic standard: IEC/EN , for emission testing: CISPR 14-1, IEC , IEC for EUTs without connected cables, for immunity testing: EN Automotive: ANSI C63.4 Annex F (2009); SAE J1752/3 Ideal for design qualification and precompliance, Calibrations of antennas and field probes, test and measuring of wireless transceivers, Shielding effectiveness testing... Field generated are largely homogeneous and simple to compute. Efficient power conversion: requires smaller power amplifiers Excellent VSWR over the entire frequency range Standard Configuration: Trolley with 30cm. height Door, Left or Right (on demand), clear opening 80x120cm. EUT Line filter box for 2x16A with magneto-thermal switch and hearth ground connection. Supply by: IEC 16A input tape and Schuko 16A output socket. Hi power termination resistors 1Kw Media interface: 1 N connector, 2 SMA, 1 fiberoptics (3 couples). Factory Measurement reports for input power requirements, and VSWR Shipped disassembled, requires GTEMCELL supervisor. Option: DIV-ASS Options: Shielded window: Diam. 25cm Switchable illumination with LED lamp Media interface: additional N and SMA, 9-poles signal filter DB9, 25-poles signal filter (DB25), RJ485 feed-thru connector RJ11 (RJ9) feed-thru connector Additional: DC termination plugs. wave guide channel for fiber optic leads 6 couples Additional RF feed-thru N type connector Additional RF feed-thru SMA type connector Door contact safety interlock for free application INOX stainless steel version for Tropical environment. Ferrite coating panels and Frankonia's absorbers on bottom Additional secondary door honeycomb panels Technical exchange media panel pre-drilled for for customized applications Customized I/O filters solutions up to 400A XZY Manipulator 2KW terminations Assembly Supervisor build up for GTEM (Travel and accommodation costs are additionally. Ordering information: The door side and the single phase AC line sockets need to be selected: Without advise we assume to supply the door left side and Schuko socket.
3 * Options such as ferrite coating on the bottom and GTEM's stainless steel frames should be decided at time of order. All other options can be added at any time without notice. Technical Specifications Height of septum in the test section at marker position Max. septum height in the back of cell Dimensions(LxWxH) m. Weight Height H 1 of cell corpus in m. h = 1500 mm H h = 1856 mm 7,16x3,83x2,73 Approx. 1500Kgs 2,43 Height H 2 of the trolley in m. 0,3 Door clear opening (LxH)cm. EUT Max. dimensions (LxWxH)m EUT Dimensions for uniform area 0 to 6dB (LxWxH) in m. Max. test volume (IEC/EN ) 0,6w x 0,6L h/3 x Maximum EUT testing volume (0 to 3 db) 80x120 (left side) 1,2x1,2x0,8 *according to the door size 0,5x0,5x0,5 0,5 x 1,75 x 3,5 h EUT = h/3 0,5 Distance of the testing section from back of cell along z axis Testing section dimensions m. Frequency range Frequency range according IEC/EN Shielding effectiveness (30MHz to 3GHz) L S = 1440 mm a=2976, b=2051, h=1500, w=2130 DC to 20 GHz 30MHz to 1000MHz >60dB (Typ.>80dB)
4 Required input power for 10V/m (isotropic, 9 points, 80 to 1000MHz) Field deviation (isotropic, 9 points, 30 to 1000MHz) RF input connector 21,9W (6,8W CW) <6dB N UG-21 connector *Optional 7/16" EM Field strenght pattern Nominal Impedance Max. Input Power 50 Ohm Typical VSWR: 1:1,2 Typ. VSWR at critical frequency: Electrical Main Switch: 1KW (*frequency depending) 1:1,6 magneto-thermal 16Amp. mono phase Input Socket plug: 16Aac (Mono Phase + Ground) Output Socket EUT tape: 16 Aac (Mono Phase + Ground) Schuko type Ground connection: AC filter wires Channel for fiber optic leads: RF feed-thru connectors: RF feed-thru connectors: M6 bolt (Mono phase +Ground) 16Amp. 2 poles. 3 couples N. 1 double N female N. 2 double SMA female TESTING VOLUME - CALCULATING POWER REQUIRED (Theory) Basically, we consider the volts per meter, the height of the septum, the allowance of voltage peaks caused by amplitude modulation and the flatness with frequency. Generally allowed flatness is 3 db, this only takes effect after the first resonance point. The example below shows 10 V/m with a GTEM 1500: Septum height = 1,500 m Flatness = 3 db = 2 Power Required = (E x h) 2 /R x Flatness x Modulation Allowance Where E = required field strength: h = septum height: R = GTEM input impedance 50 Ohm Power Required = (10 x 1,500) 2 / 50 x 2 x 3.24 = 29,16 Watt
5 G T E M Power requirements Field Strenght [E] Flatness Modulation allowance Required power modulated Required power CW V/m 3dB = 2 80% AM Watts Watts 3 2 3,24 2,63 1, ,24 29, ,24 262,44 81 Theoretical Field Strength vs CW Input Power
6 Factory controls: Performance test. A verification test was performed on site of the installation with a Rohde e Schwarz FSH6 spectrum analyzer and its SWR bridge accessory. REFLECTION COEFFICIENT: REFLECTION COEFFICIENT: S11 magnitude of GTEM 1500 in the range 10MHz-6000MHz S11 magnitude of GTEM 1500 in the range 10MHz-3000MHz Tab.1 Guaranteed reflection coefficient S11 GTEM 1500 Reflection coefficient S11 <-14 db in 100 MHz-3,8 GHz
7 MECHANICAL Metal sheets configuration
8 Trolley Front view, door and absorbers
9 Spherical bottom - wooden structure
10 Renforcement bars
11 Door details * Optional: Door size 140x140cm. (clear passage) Different size on demand.
12 EUT Control Panel Schematic Diagram Mono phase and Three-phase option LINE FILTER COGEMA Minipulse Mod S 400Vac 4x30A (25 C), 4x25A (45 C) L=1,4mH, Cx=840nF, Cy=0,22uF, R=250KOhm Magnet-thermally switch B-Ticino Mod. C-20 20Amp. Lamp: 250Vac connected between N (Neutral) and L1
13 COMPONENT LIST Q.ty Description Brand Model 1 Three phase Line Filter: 400Vac 4x30A (25 C), 4x25A (45 C) L=1,4mH, Cx=840nF, Cy=0,22uF, R=250KOhm COGEMA Minipulse S 1 Magnet-thermally switch B-Ticino C V ac 50-60Hz 25Amp. 1 Magnet-thermally switch B-Ticino C V ac 50-60Hz 16Amp 1 Lamp 250Vac
14 Before using the GTEM-1500 please read the following instructions
15 READ WARNINGS BEFORE USING ASSISTANCE - Refer to ours local dealers or contact us by mail at: gtem.cell@gmail.com HANDLE CAREFULLY The GTem cell is a professional test equipment intended for EMC emissions and immunity test purposes operated by trained personnel. Some care are necessary: - To move the cell don t take the apex!, push or pull from the trolley frame, before moving un-lock the brakes on the swively wheels and when you finish lock again. - Open or close the door handling softly. - Insert always straight the N and SMA connectors, don t tight too much, it is not necessary!. - A N type corner adaptor connector to protect the apex is supplied, please don t remove it. In case of break replace, try to use always this adaptor to reduce stress at the N apex connector. RADIO FREQUENCY RADIATION Personnel should not be exposed to the microwave energy which may radiate from this device. All inputs or output RF connection gaskets must be leak proof. Never look inside or leave doors open when this device is energized!. ELECTROMAGNETIC FIELD Strong RF levels may cause de-magnetization and interference to others services. Operate always with the door closed and keep far away from sensitive devices. SHOCK HAZARD Accidental short circuit or leakage current may occurs: Supply the unit through magnetothermal differential switches lines. Keep always the GTem cell grounded permanent with a 16sqmm. conductor, also with power supply disconnected. During normal tests operation connect energy only with the door closed. ELECTROSTASTIC DISCHARGE To avoid ESD keep always the GTem cell grounded fitted with a permanent earth 16mmq. conductor. DANGER Risk of injury at hands and head or cuts around the metallic surfaces of the chamber may occurs. Leave around the cell a free area from obstacles. MAINTENANCE Verify periodically: - the status of the door gasket, (you can also reverse the gaskets before replace with a new one...normally the life is over 5year ). - I/O connectors integrity. - Oils the wheels of the trolley and the door hinges if some oxide appears. - clean the knifes of the door with metal wool or fine abrasive paper. Clean inside the chamber excess of carbon dust of the absorbers with a vacuum cleaner. Protect metallic surfaces against corrosion, cleaning with a soft cloth wet of Vaseline, or Paraffin oils. Avoid any cleaner water or chlorine based products! For any trouble or further information please contact: gtem.cell@gmail.com you are welcome!. TROUBLESHOOTING No power supply: the main switch is OFF, or over current >16A No field with RF power applied: pin of the coaxial connector broken, connection cable defective: replace with a good quality one.
16 ADDITIONAL INFO Power supply: when necessary connect the AC 230V power cord only to tapes with differential switch and magneto-thermal switch. Load: Do not apply over load to the AC line filter: remember the Max. load* is 15A for the plug and 10Amps DC for the banana jacks, (* according with the filters specifications) Ground A ground connection is necessary for your safety: connect permanently the ground screw placed nearby the filter box at the your building earth system with a 16mm 2. Verify periodically the status of the connection. Remember that the metallic structure is conductive Additional holes: You can make holes only on the technical panel ( remove it if necessary), than place wave guide. When you don't use close the holes with metal cup or fill them with metallic wool. RF Power input: Usually at low level no care is necessary, the terminations are over dimensioned (the limit of the components is 1Kw in normal environmental conditions -10 C to +40 C and operating temperature could reach 100 C!). In hi-power RF level (Over 200W) RF, special care are necessary for your safety and health. WARRANTY The Gtem cell is covered from defects for a period of 2 years. Are not covered normal use parts as gaskets, I/O connectors, line filters. Defective parts noticed us are replaced with the same parts if available or superior with no cost added. Assembly costs are not included, if required our personnel is available.
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