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A.H. Systems AK-285R Shielding Effectiveness Antenna Kit

GENERAL INFORMATION

INTENDED PURPOSES

This equipment is intended for general laboratory use in a wide variety of industrial 
and scientific applications, and designed to be used in the process of measuring 
high levels of electromagnetic Radio Frequency (RF) energy. It is the responsibility 
of the user to assure that the device is operated in a location which will measure 
the radiated energy such that it will not cause injury and will not violate regulatory 
levels of electromagnetic interference.

GENERAL DESCRIPTION

The A.H. Systems AK-285R and AK-285T antenna kits includes all of the required 
antennas   needed   to   perform   shielding   effectiveness.   Each   component   has   a 
specific storage compartment in the carrying case therefore, loss and breakage 
are virtually eliminated. Cables, a tripod with azimuth and elevation head, and a 
tripod   carrying   case   accompany   each   antenna   kit.   Each   of   the   antennas,   and 
cables, are provided with calibrations when connected to a 50-ohm input receiver 
or spectrum analyzer.

Each of the E-field antennas mounts directly to the tripod azimuth and elevation 
head. The azimuth and elevation head allows the operator to vary the antenna 
azimuth (direction) and tilt the antenna up and down. The antenna polarity can 
also be rotated (horizontal or vertical).

Cables and an adapter are provided to connect each antenna and probe to either 
a BNC or N type connector on the receiver. 

To obtain the field strength of the signal being measured, the operator must add 
the receiver reading in dBuV, the antenna factor in dB, and the cable attenuation in 
dB. This yields the field strength in dBuV/m. Calibrations for the E-field antennas 
are supplied at appropriate distances (1, 3, and 10 meter) to comply with various 
specification requirements.

 A.H. Systems inc. – August 2011

REV A

5

Summary of Contents for AK-285R

Page 1: ...5R Shielding Effectiveness Antenna Kit AK 285R Shielding Effectiveness Antenna Kit Operation Manual A H Systems inc August 2011 REV A 1 Advanced Test Equipment Rentals www atecorp com 800 404 ATEC 2832 Established 1981 ...

Page 2: ...g Effectiveness Antenna Kit TABLE OF CONTENTS WARRANTY 3 INTRODUCTION 4 GENERAL INFORMATION 5 EQUIPMENT AND OPERATION 6 DYNAMIC RANGE 11 ANTENNA FORMULAS 13 CONVERSION FORMULAS 14 MAINTENANCE 15 A H Systems inc August 2011 REV A 2 ...

Page 3: ... 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 A H Systems accident fire or other casualty negli...

Page 4: ...SAS 571 700 MHz 18 GHz Double ridge guide horn SAC 18G 3 Up to 18 GHz 3 Meter Low Loss Cable TSC 285R Transit Storage Case ADP 201 N m to BNC f Adapter ADP 202 N f to BNC m Adapter ATU 510 Wood Tripod AEH 510 Azimuth and Elevation Head TCC 510 Tripod Carrying Case OPTIONAL EQUIPMENT PAM 0118 20 MHz 18 GHz 33 dB Preamplifier SAC 18G 0 5 Up to 18 GHz 0 5 Meter Low Loss Cable Tripod Case Antenna Case...

Page 5: ...liminated Cables a tripod with azimuth and elevation head and a tripod carrying case accompany each antenna kit Each of the antennas and cables are provided with calibrations when connected to a 50 ohm input receiver or spectrum analyzer Each of the E field antennas mounts directly to the tripod azimuth and elevation head The azimuth and elevation head allows the operator to vary the antenna azimu...

Page 6: ...ht antenna that has been designed to ensure maximum gain low VSWR and high power handling capabilities This compact design is an ideal solution for EMC testing where the reduced size of the antenna is preferred to minimize chamber wall coupling and increasing the half power beamwidth to a more acceptable angle that will cover the whole device under test Constructed of lightweight aluminum the SAS ...

Page 7: ...ower capability and intended for both transmitting and receiving high electromagnetic RF fields For rapid deployment along with the mobility of a small package the Folding Biconical elements can be closed similar to an umbrella allowing the antenna to be contained in an optional transit storage case Whether testing in a shielded enclosure or outdoors the rugged construction of the A H Systems Bico...

Page 8: ...na it is ideal for instantaneous bandwidth scanning without tuning of electric fields in its frequency range and can drive any receiver with 50 ohm input impedance The EHA 51B is also an active receive only loop antenna for magnetic field testing It is suitable for MIL STD VDE and TEMPEST testing with reliable repeatable measurements Assembly The active antenna consists of a ground plane upon whic...

Page 9: ... maximum gain low VSWR and broadband response The double ridge guide horn antenna was initially designed for surveillance where a high gain broadband response was required Assembly The horn antenna comes assembled and ready to use The antenna mounting bracket is attached to the antenna backwards in order to fit in the carrying case The bracket must be removed from the antenna rotated so that the b...

Page 10: ...T The AK 285R case comes with three additional cutouts for optional preamplifiers In order to improve overall system sensitivity the following equipment will be required PAM 0118 with an SAC 18G 0 5 PAM 1840 with an SAC 40G 0 5 PAM 0118 Preamplifier 20 MHz 18 GHz The preamplifier will increase the system sensitivity 33 dB and is recommend for the SAS 510 2 SAS 544F and SAS 571 An optional short le...

Page 11: ...MHz 130 19 6 6 99 30 129 10 MHz 130 17 5 6 6 100 5 30 130 5 20 MHz 134 9 6 6 113 30 143 40 MHz 134 8 6 6 114 30 144 50 MHz 134 3 6 6 119 30 149 Loops 1 MHz 130 52 6 6 66 30 96 5 MHz 130 39 6 6 79 30 109 10 MHz 130 31 6 6 87 30 117 20 MHz 134 38 6 6 84 30 114 40 MHz 134 51 5 6 6 70 5 30 100 5 50 MHz 134 53 5 6 6 68 5 30 98 5 Biconicals 20 MHz 134 33 5 6 6 88 5 31 119 5 50 MHz 134 23 6 6 6 98 4 31 1...

Page 12: ... antennas This is the signal to noise floor safety margin Xmtr Amp Margin Transmitting amplifier safety margin 0 dB Sig Gen Dynamic Range This is the resulting system dynamic range of the two antennas with 0 dB out from the signal generator Preamp Gain this is the typical gain of the preamplifier The biconical and log periodic antennas use the typical gain of a PAM 0202 if using the PAM 0118 add a...

Page 13: ...o receiver reading in dBuV to convert to field strength in dBuV meter Field Strength dBuV m SA dBuV AF dB cable loss dB LOOP ANTENNA Add the magnetic antenna factor plus cable loss to receiver reading in dBuV to convert to field strength in dBuA meter dBuA m dBuV AF magnetic Cable Loss dBuV m dBuA m 51 5 dB A H Systems inc August 2011 REV A 13 ...

Page 14: ...m to µT µT 1 25 A m dBµA to dBA dBA dBµA 120 E FIELD ANTENNAS LOG LINEAR POWER Correction Factor dBµV m dBµV 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 dBµA m dBµV AF dBW to dBm dBm dBW 30 Assumed E fiel...

Page 15: ...sting for electromagnetic compatibility EMC requires the measurement of electric field E field strength which is compared with a limit level The output voltage of an antenna is converted to E field strength via its antenna factor the measurement of which must include the uncertainty components related to that particular antenna taking into consideration the environment in which the antenna is to b...

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