AMPLIFIER RESEARCH... APPLICATION NOTE: 20 AMPLIFIER RESEARCH PRODUCTS THAT PROVIDE 20 V/m CW OR PM AT A DISTANCE OF 1 METER 1 The Amplifier / Antenna / Cell combinations shown in Table 1 provide various means of generating 20 V/m, CW or Pulse Modulated, inside a TEM Cell or ARCell, between the elements of an E-field generator, or at a distance of one meter from a radiating antenna, from 10kHz to 18GHz. This table is used in conjunction with the enclosed product selection flow chart and system diagrams. The appropriate combination of products is determined by first noting the physical size of the Device Under Test (DUT). The size of the test object determines the appropriate path taken on the flow chart. Follow the path that accommodates the maximum expected DUT size. As an example, to test a device 16 inches or less on a side across the entire frequency band from 10kHz to 18GHz, select items 13, 14, 15, 16, and 17. If the test object were greater than 39 inches, items 1, 2, 3, 4, and 5 would be appropriate. When testing small objects, a TEM cell offers an economical solution in that it is used in lieu of both a radiating antenna and a shielded enclosure. For a test object 4 inches or less in height, select items 21 and 22. If the DUT is 2 inches or less in height, then items 23 and 24 can be used. The TC1000A, TC2000C, TC3000A, and TC4000A ARCells offer semi-anechoic performance and also include built in field generators. ARCells offer convenient, cost effective alternatives to conventional susceptibility test systems consisting of a shielded room or anechoic chamber. With four enclosures to choose from, one can test devices from 12 /side to 39 /side from 10kHz to 4.2GHz. The maximum field level, frequency range, and test volume is cell dependent. See the Know Before You Go ARCell brochure and Application Note 34 for details. Caution: There are a number of factors that impact the ultimate selection of a power amplifier for immunity testing. Depending upon the actual test configuration, one must plan on cable and connector losses, insertion loss through test apparatus such as directional couplers, variation in antenna characteristics such as gain and VSWR, and finally VSWR fluctuations due to reflections from the DUT and various room surfaces. A general rule of thumb that takes these adverse affects into account is to increase the size of the power amplifier by a factor of between 2 to 3. This would accommodate the anticipated system losses of between 3 to 5 db. In this specific case of 20V/m, if the DUT is small and one of the TEM cells is used, the power amplifiers specified have sufficient margin. To accurately determine field strength in the area of the DUT, a field monitor such as the Amplifier Research FM5004 and an appropriate field probe are required. Contact the factory for specific recommendations.
20 V/m CW OR PM AT A DISTANCE OF 1 METER 1 ITEM 2 FREQUENCY AMPLIFIER ANTENNA or CELL DUT PLACEMENT 1 10kHz-100MHz 500A100A AT5000M3 1 meter 2 100MHz-1GHz 30W1000B AT1080 1 meter 3 1GHz-4GHz 5S1G4 AT4002A 1 meter 4 4GHz-8GHz 1 meter 5 8GHz-18GHz 1 meter 6 27MHz-1GHz 100W1000B TC4000A 3 meters 7 1GHz-2.7GHz 100S1G4 TC4000A 3 meters 8 27MHz-1GHz 50W1000B TC3000A >1 meter 9 1GHz-2.7GHz 50S1G4A TC3000A >1 meter 10 10kHz-250MHz 75A250A TC2000C <1 meter 11 250MHz-1GHz 30W1000B TC2000C <1 meter 12 1GHz-4.2GHz 25S1G4A TC2000C <1 meter 13 10kHz-100MHz 25A250A AT3100 Between Elements 14 100MHz-1GHz 30W1000B AT1080 1 meter 15 1GHz-4GHz 5S1G4 AT4002A 1 meter 16 4GHz-8GHz 1 meter 17 8GHz-18GHz AT4004 1 meter 18 10kHz-250MHz 75A250A TC1000A <1 meter 19 250MHz-1GHz 30W1000B TC1000A <1 meter 20 1GHz-2.7GHz 25S1G4A TC1000A <1 meter 21 10kHz-250MHz 25A250A TC3020A Center of Cell 22 250MHz-375MHz 1W1000B TC3020A Center of Cell 23 10kHz-250MHz 25A250A TC1510A Center of Cell 24 250MHz-750MHz 1W1000B TC1510A Center of Cell Table 1 1 The rf fields generated by the products recommended in this application note are either CW or pulse modulated, and occur at a distance of one meter unless otherwise noted. If the application mandates amplitude modulation, additional amplifier power is required to produce undistorted, linear fields. Call Application Engineering at 800-933-8181 for details.
2 The Item numbers match the Block numbers on the enclosed Product Selection Flow Chart. Rev032300
20V/m CW or PM @ 1M* Amplifier/Antenna/Cell Selection Chart >39 AT5000M3 500A100A 1 AT1080 30W1000B AT4002A 5S1G4 2 3 4 5 39 TC4000A 100W1000MB TC4000A 100SIG4 6 7 39 TC3000A 50W1000B TC3000A 50S1G4A 8 9 20 16 TC2000C 75A250A AT3100 25A250A TC2000C 30W1000B AT1080 30W1000B TC2000C 25S1G4A 10 11 12 AT4002A 5S1G4 13 14 15 16 17 12 TC1000A 75A250A 18 TC1000A 19 TC1000A 20 30W1000B 25S1G4A 4 TC3020A 25A250A 21 22 TC3020A 1W1000B 2 TC1510A 25A250A TC1510A 1W1000B 23 24 10kHz 27MHz 100MHz 250MHz 1GHz 2.7GHz 4GHz 8GHz 18GHz * The numbered cells represent either Amplifier / Antenna or Amplifier / Cell combinations. The actual distance from the field generator to the DUT may vary from 1 meter. See Table 1 for details.
TYPICAL PRE-COMPLIANCE SUSCEPTIBILITY TEST SYSTEMS (Use in applications that call for "Leveled" or "Real-Time" testing) RF Source Pre-Amplifier Power Amplifier (Optional) Radiating Antenna Personal Computer w/ GPIB Card Field Monitor Fiber Optic Cable Field Probe HARDWARE LEVELED SYSTEM DeviceUnder Test Anechoic or Shielded Room RF Source Power Amplifier Radiating Antenna Field Probe DeviceUnder Test Personal Computer w/ GPIB Card Field Monitor Fiber Optic Cable Anechoic or Shielded Room GPIB Cable FIELD LEVELED VIA SOFTWARE Figure 1
FULL COMPLIANCE SUSCEPTIBILITY TEST SYSTEM (Use in applications that call for "Substitution Method" testing) RF Source Power Amplifier Dual Directional Coupler Power Meter Radiating Antenna Fiber Optic Cable Field Probe DeviceUnder Test Personal Computer w/ GPIB Card Field Monitor Anechoic or Shielded Room GPIB Cable Figure 2