A.H. Systems EHA-51B Operation Manual Download | Manualshive

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A.H. Systems Model EHA-51B Active Monopole and Loop Antenna

EHA-51B Active

Monopole and Loop Antenna

Operation Manual



A.H. Systems inc. – Oct 2017

REV B

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Summary of Contents for EHA-51B

Page 1: ...A H Systems Model EHA 51B Active Monopole and Loop Antenna EHA 51B Active Monopole and Loop Antenna Operation Manual A H Systems inc Oct 2017 REV B 1 ...

Page 2: ...ctive Monopole and Loop Antenna TABLE OF CONTENTS Introduction 3 Specifications 5 Operating Instructions 7 Recommended Accessories 10 Calculations 11 Antenna Formulas 12 Maintenance 13 Warranty 14 A H Systems inc Oct 2017 REV B 2 ...

Page 3: ...UCTION Model Frequency Range Part Number Description EHA 51B 1 kHz 30 MHz 2661 Active 12 Loop Monopole Antenna INCLUDED EQUIPMENT Amplifier matching base unit 12 shielded loop antenna 41 telescoping rod antenna element battery charger A H Systems inc Oct 2017 REV B 3 ...

Page 4: ...which will control the radiated energy such that it will not cause injury and will not violate regulatory levels of electromagnetic interference RANGE OF ENVIRONMENTAL CONDITIONS This equipment is designed to be safe under the following environmental conditions Indoor use Altitude up to 2 km Temperature 5 C to 40 C Maximum relative humidity 80 for temperatures up to 31 C Decreasing linearly to 50 ...

Page 5: ...mpedance The EHA 51B is also an active receive only loop antenna for magnetic field testing This loop antenna is ideal for emissions testing and has a balanced Faraday shield to reduce the E field response for a pure magnetic field measurement It is suitable for MIL STD VDE and TEMPEST testing with reliable repeatable measurements Review this manual and become familiar with all safety markings and...

Page 6: ...A H Systems Model EHA 51B Active Monopole and Loop Antenna TYPICAL CORRECTION FACTOR A H Systems inc Oct 2017 REV B 6 ...

Page 7: ...mpedance matching amplifier base and attached the corresponding antenna element The telescoping rod antenna element will require a BNC f to N m adapter SETUP INSTRUCTIONS The antenna can be mounted to any tripod with a 1 4 20 attaching stud Connect the output BNC connector on the side of the impedance matching amplifier base to the input of a 50 analyzer or receiver A H Systems inc Oct 2017 REV B ...

Page 8: ...ntenna is being used this interval can be adjusted The calibration tables shown provide a listing of the frequency of operation and its antenna factor in dB m The field strength is the receiver voltage in dB V plus the antenna factor refer to the antenna factor calibration plus any cable loss When making a measurement mount the antenna on an appropriate mast or tripod with the plane of the loop an...

Page 9: ...osition to charge the battery Every hour of charge will result in two hours of operation for up to 10 hours of charging Charging for up to 24 hours will not damage the battery Using the battery charger to operate the amplifier directly is not recommended REPLACING THE BATTERIES Remove the four 6 32 flat head screws from the bottom of the base unit Disconnect the battery lead from the PC card Re co...

Page 10: ...SAC 461F is a cable kit required by MIL STD 461F that contains the appropriate ferrite bead and floor mounting bracket SAS 564 The SAS 564 has an input handling capability up to 500 Watts and rugged design which makes this loop antenna excellent for immunity and shielding effectiveness testing SAC 210 Standard 3 meter BNC m to BNC m RF cable made with RG 58 Optional ferrite loading and custom leng...

Page 11: ... emissions measurements add antenna factor plus cable loss to receiver reading in dB V to convert to field strength in dB A meter Field Strength dBuA m SA dBuV MAF dB m cable loss dB SA Spectrum Analyzer or Receiver voltage reading MAF Magnetic Antenna Correction Factor CL Cable Loss in dB Fictitious electric field strength can be calculated by the following dB V m dB A m 51 5 A H Systems inc Oct ...

Page 12: ...0 A m to T T 1 25 A m dB A to dBA dBA dB A 120 E FIELD ANTENNAS LOG LINEAR POWER Correction Factor dB V m dB V AF dBm to Watts W 10 dBm 30 10 Field Strength V m 30 watts Gain numeric meters Watts to dBm dBm 10log W 30 Required Power Watts V m meters 2 30 Gain numeric dBW to Watts W 10 dBW 10 LOOP ANTENNAS Watts to dBW dBW 10log W Correction Factors dB A m dB V AF dBW to dBm dBm dBW 30 Assumed E fi...

Page 13: ...tems experienced technicians is recommended Our staff can recalibrate almost any type or brand of antenna Repair maintenance is not recommended in the field The antenna should be returned to A H Systems For more information about our calibration services or to place an order for antenna calibration visit our website at www AHSystems com or call 818 998 0223 A H Systems inc Oct 2017 REV B 13 ...

Page 14: ... commencing with the delivery of the product by A H Systems The remedy set forth herein shall be the only remedy available to the buyer and in no event shall A H Systems be liable for direct indirect incidental or consequential damages This warranty shall not apply to any part of the product which without fault of A H Systems has been subject to alteration failure caused by a part not supplied by ...

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