A.H. Systems SAS-562B User manual

A.H. Systems Model SAS-562B Active Loop Antenna
SAS-562B Active
Loop Antenna
Operation Manual
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A.H. Systems Model SAS-562B Active Loop Antenna
TABLE OF CONTENTS
INTRODUCTION 3
SPECIFICATIONS 5
OPERATING INSTRUCTIONS 7
CALCULATIONS
ANTENNA FORMULAS 2
MAINTENANCE 3
WARRANTY 4
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A.H. Systems Model SAS-562B Active Loop Antenna
INTRODUCTION
Model
Frequency
Range
Part
Number Description
SAS-562B 0 kHz – 30 MHz 2383 Active 8” Loop Antenna
INCLUDED EQUIPMENT
•Amplifier/matching base unit
•8” shielded loop antenna
•battery charger
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A.H. Systems Model SAS-562B Active Loop Antenna
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A.H. Systems Model SAS-562B Active Loop Antenna
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 generating,
controlling and 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 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 3  C.
Decreasing linearly to 50% at 40 C
Pollution degree 2: Normally non-conductive with occasional
condensation.
While the equipment will not cause hazardous condition over this environmental
range, performance may vary.
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A.H. Systems Model SAS-562B Active Loop Antenna
SPECIFICATIONS
GENERAL DESCRIPTION
The A.H. Systems active loop antenna is a receiving antenna that covers the
0 KHz – 30 MHz frequency range. 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. Review this manual and become familiar
with all safety markings and instructions.
ANTENNA SPECIFICATIONS
SAS-563B Loop Antenna specifications:
Frequency Range .................................................. 0 kHz – 30 MHz
Impedance ...........................................................................50 ohms
Output Connector Type ..........................................................BNC(f)
Mounting .................................................................... /4-20 Tread(f)
Weight .....................................................................3. lbs. ( .4 kg)
Loop Diameter .............................................................. 8" (45.7cm)
Typical correction factor:
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A.H. Systems Model SAS-562B Active Loop Antenna
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A.H. Systems Model SAS-562B Active Loop Antenna
OPERATING INSTRUCTIONS
ASSEMBLY INSTRUCTIONS
To prepare the antenna for operation, attach the shielded loop antenna
element to the top of the impedance matching/amplifier base.
SETUP INSTRUCTIONS
The antenna can be mounted to any tripod with a /4-20 attaching stud.
Connect the output BNC connector on the side of the antenna to the input of a
50  analyzer or receiver.
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A.H. Systems Model SAS-562B Active Loop Antenna
GENERAL USE INSTRUCTIONS
The SAS-562B loop antenna is an active loop designed to perform magnetic
field and shielding effectiveness testing. The loop antenna has a balanced
Faraday shield to reduce the E-field response for a pure magnetic field
measurement.
Each antenna is individually calibrated per IEEE 29 - 99 and comes with a
calibration certificate references the NIST traceable test equipment. Initially
the antenna comes with a year calibration interval, however depending on
the type of use and standards that the antenna 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 antenna facing the DUT.
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A.H. Systems Model SAS-562B Active Loop Antenna
CHARGING THE BATTERY
Plug the battery charger into either 0 – 20 Vac, 60 Hz or 220 – 240 Vac,
50 Hz. The amplifier ON-OFF switch must be in the OFF/CHARGE position to
charge the battery. Connect the other end of the charger to the charging port
of the amplifier. The charger should now be on and charging the battery. The
indicator light should be red. The red charge light will stay on until the battery
is about 95% recharged. At this point the indicator will turn green and the
battery may be used. The battery should be left connected to the charger for
an additional three hours to ensure a 00% recharge. To ensure a full charge
and to help your battery keep its full capacity, we recommend that the battery
be left connected to the charger, in float charge mode, until ready to use. The
battery may be left connected to the charger indefinitely, in float charge mode,
without danger of overcharging. 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-connect the lead from the
new battery pack to the PC card. Snug the four 6-32 flat head screws.
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A.H. Systems Model SAS-562B Active Loop Antenna
RECOMMENDED ACCESSORIES
The following is a recommend accessory list for the SAS-563B Active Loop
Antenna:
SAC-210
Standard 3 meter BNC(m) to BNC(m) RF cable made with RG-58. Optional
ferrite loading and custom lengths can be made to your specifications. Other
cable types available upon request.
Tripod
The ATU-5 0 wooded Tripod comes with a spring loaded /4-20 male thread for
mounting the SAS-563B Loop antenna.
Adapters
Need an Adapter? We stock those as well.
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A.H. Systems Model SAS-562B Active Loop Antenna
CALCULATIONS
EMISSIONS TESTING
Individual calibration data for the active loop antenna is supplied to comply
with various emissions test requirements. For 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 + 5 .5
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A.H. Systems Model SAS-562B Active Loop Antenna
TYPICAL ANTENNA FORMULAS
LOG -> LINEAR VOLTAGE FIELD STRENGTH & POWER DENSITY
dBV to Volts V = 0 ((dBV – 20) / 20) dBV/m to V/m V/m = 0 (((dBV/m) - 20) / 20)
Volts to dBV dBV = 20 log(V) + 20 V/m to dBV/m dBV/m = 20 log(V/m) + 20
dBV to Volts V = 0 (dBV / 20) dBV/m to dBmW/m2dBmW/m2 = dBV/m – 5.8
Volts to dBV dBV = 20log(V) dBmW/m2 to dBV/m dBV/m = dBmW/m2 + 5.8
dBV to dBV dBV = dBV + 20 dBV/m to dBA/m dBA/m = dBV/m – 5 .5
dBV to dBV dBV = dBV - 20 dBA/m to dBV/m dBV/m = dBA + 5 .5
LOG -> LINEAR CURRENT dBA/m to dBpT DBpT = dBA/m + 2
dBA to uA A = 0 (dBA / 20) dBpT to dBA/m dBA/m = dBpT – 2
A to dBA dBA = 20 log(A) W/m2 to V/m V/m = SQRT(W/m2 * 377)
dBA to A A = 0 (dBA / 20) V/m to W/m2W/m2 = (V/m)2 / 377
A to dBA dBA = 20log(A) T to A/m A/m = T / .25
dBA to dBA dBA = dBA + 20 A/m to TT = .25 * A/m
dBA to dBA dBA = dBA - 20 E-FIELD ANTENNAS
LOG -> LINEAR POWER Correction Factor dBV/m = dBV + AF
dBm to Watts W = 0((dBm – 30)/ 0) Field Strength V/m = 30 * watts * Gain numeric
meters
Watts to dBm dBm = 0log(W) + 30 Required Power Watts = (V/m * meters)2
30 * Gain numeric
dBW to Watts W = 0(dBW / 0) LOOP ANTENNAS
Watts to dBW dBW = 0log(W) Correction Factors dBA/m = dBV + AF
dBW to dBm dBm = dBW + 30 Assumed E-field for
shielded loops
dBV/m = dBA/m + 5 .5
dBm to dBW dBW = dBm - 30 dBpT = dBV + dBpT/V
TERM CONVERSIONS
dBm to dBVdBV = dBm + 07 (50)
dB  V = dBm + 10log(Z) + 90
CURRENT PROBES
dBV to dBm dBm = dBV – 07 (50)
dBm = dB  V – 10log(Z) – 90
Correction Factor dBA = dBV – dB(ohm)
dBm to dBA dBA = dBm – 73 (50)
dB  A = dBm – 10log(Z) + 90
Power needed for injection probe given voltage(V) into
50 load and Probe Insertion Loss (IL)
dBA to dBm dBm = dBA + 73 (50)
dBm = dB  A + 10log(Z) – 90
Watts = 0 ((IL + 0log(V2/50))/ 0)
dBA to dBV dBV = dBA + 34 (50)
dB  V = dB  A + 20log(Z)
dBV to dBA dBA = dBV – 34 (50)
dB  A = dB  V – 20log(Z)
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A.H. Systems Model SAS-562B Active Loop Antenna
MAINTENANCE
To ensure reliable and repeatable long-term performance,
annual re-calibration of your active loop preamplifier by A.H.
Systems’ 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 (8 8) 998-0223.
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A.H. Systems Model SAS-562B Active Loop Antenna
WARRANTY INFORMATION
A.H. Systems Inc., warrants that our Antennas, Sensors and Probes will be free from
defects in materials and workmanship for a period of three (3) years. All other
products delivered under contract will be warranted for a period of two (2) years.
Damage caused by excessive signals at the product's input is not covered under the
warranty. A.H. Systems' obligation under this warranty shall be limited to repairing or
replacing, F.O.B. Chatsworth, California, each part of the product which is defective,
provided that the buyer gives A.H. Systems notice of such defect within the warranty
period 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 A.H.
Systems, accident, fire or other casualty, negligence, misuse or normal wear of
materials.
Except for the warranty set forth above, there are no other warranties, expressed or
implied, with respect to the condition of the product or it's suitability for the use
intended for them by the buyer.
For prompt service, please contact our service department for a Return Material
Authorization Number before shipping equipment back to us.
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