A.H. Systems SAS-551 User manual

A.H. Systems Model SAS-551 Passive Monopole Antenna
SAS-551 Passive
Monopole Antenna
Operation Manual
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A.H. Systems Model SAS-551 Passive Monopole Antenna
TABL OF CONT NTS
INTRODUCTION 3
SP CIFICATIONS 5
OP RATING INSTRUCTIONS 6
ANT NNA FORMULAS 8
CALIBRATION 10
MAINT NANC 11
WARRANTY 12
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A.H. Systems Model SAS-551 Passive Monopole Antenna
INTRODUCTION
Model
Frequency
Range
Part
Number Description
SAS-551 9 kHz – 40 MHz 2348 Passive Monopole Antenna
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A.H. Systems Model SAS-551 Passive Monopole Antenna
INT ND D PURPOS S
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.
RANG OF NVIRONM NTAL 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% 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-551 Passive Monopole Antenna
SP CIFICATIONS
G N RAL D SCRIPTION
The A.H. Systems passive monopole antenna is a general-purpose transmitting
antenna which cover the 10 KHz – 40 MHz frequency range. ach unit comes
with a telescoping rod and ground plane. Review this manual and become
familiar with all safety markings and instructions.
ANT NNA SP CIFICATIONS
SAS-551 Monopole Antenna specifications:
Frequency Range ....................................................9 kHz – 40 MHz
Input Connector Type..............................................................BNC(f)
Mounting Base............................................................1/4-20 Tread(f)
Weight....................................................................................3.5 lbs.
Size (W x H x D)..........................................................18" x 18" x 41"
46 cm x 46 cm x 104 cm
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A.H. Systems Model SAS-551 Passive Monopole Antenna
OP RATING INSTRUCTIONS
ASS MBLY INSTRUCTIONS
To prepare the antenna for operation, attach the telescoping rod antenna
element to the top of the ground plane box.
Connect the rod antenna by pushing straight down on the female
connector on top of the amplifier. Do not apply excessive sideways force
as this can cause the antenna center-pin to break.
S TUP INSTRUCTIONS
The ground plane can be mounted to any tripod with a 1/4-20 attaching stud.
xtend the rod antenna to 41" (104 cm) above the ground plane. Connect the
output BNC connector on the side of the antenna to the output of a 50 
generator or amplifier. stablish a ground connection to the ground plane if
required by the test specification.
G N RAL US INSTRUCTIONS
The SAS-551 Monopole antenna is a passive antenna designed to transmit
high electric fields
This antenna may also be used as a passive receive antenna for testing in
areas with high fields.
ach antenna is individually calibrated per ANSI C63.5 ( CSM) and comes with
a calibration certificate references the NIST traceable test equipment.
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.
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A.H. Systems Model SAS-551 Passive Monopole Antenna
OPTIONAL QUIPM NT
The following is a recommend accessory list for the SAS-551 Passive Monopole
Antenna:
ECF-10
The CF-10 is an equivalent capacitance fixture constructed per I 291 and
ARP 958. This is an indispensable tool used for gain adjustment and calibration
of the active monopole antennas. The CF-10 is used as a signal substitution
source when calibrating the active monopole antennas. Refer to the calibration
procedures below.
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.
Adapters
Need an Adapter? We stock those as well.
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A.H. Systems Model SAS-551 Passive Monopole Antenna
CALCULATIONS
EMISSIONS TESTING
Individual calibration data for the passive monopole 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V/meter.
Field Strength(dBuV/m) = SA(dBuV) + AF(dB/m) + cable loss (dB)
SA = Spectrum Analyzer or Receiver voltage reading
AF = Antenna Correction Factor
CL = Cable Loss in dB
IMMUNITY TESTING
For Immunity measurements, the generated electric field strength can be
calculated by:
FS = Approximate Field Strength in (V/m)
P = Power in watts
g = Numeric Gain
d = Distance in meters
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A.H. Systems Model SAS-551 Passive Monopole Antenna
TYPICAL CONV RSION FORMULAS
LOG -> LINEAR VOLTAGE FIELD STRENGTH & POWER DENSITY
dBV to Volts V = 10 ((dBV – 120) / 20) dBV/m to V/m V/m = 10 (((dBV/m) -120) / 20)
Volts to dBV dBV = 20 log(V) + 120 V/m to dBV/m dBV/m = 20 log(V/m) + 120
dBV to Volts V = 10 (dBV / 20) dBV/m to dBmW/m2dBmW/m2 = dBV/m – 115.8
Volts to dBV dBV = 20log(V) dBmW/m2 to dBV/m dBV/m = dBmW/m2 + 115.8
dBV to dBV dBV = dBV +120 dBV/m to dBA/m dBA/m = dBV/m – 51.5
dBV to dBV dBV = dBV - 120 dBA/m to dBV/m dBV/m = dBA + 51.5
LOG -> LINEAR CURRENT dBA/m to dBpT DBpT = dBA/m + 2
dBA to uA A = 10 (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 = 10 (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 / 1.25
dBA to dBA dBA = dBA + 120 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 -field for
shielded loops
dBV/m = dBA/m + 51.5
dBm to dBW dBW = dBm - 30 dBpT = dBV + dBpT/V
TERM CONVERSIONS
dBm to dBVdBV = dBm + 107 (50)
dB  V = dBm + 10log(Z) + 90
CURRENT PROBES
dBV to dBm dBm = dBV – 107 (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 = 10 ((IL + 10log(V2/50))/10)
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-551 Passive Monopole Antenna
CALIBRATION
Monopole Calibration
The antenna factor for the rod antenna shall be determined by measuring the signal transfer
characteristics of the matching device and assuming that the antenna is a short monopole with an
infinite ground plane. Set up the monopole to be calibrated and the test equipment per Figure 3.
Allow all equipment to warm up for 15 minutes.
* Also referred to as a Dummy Antenna.
Figure 3
NOT S
If the VSWR of the receiver or signal generator is low, pads may not be needed or reduced to 6 dB
or 3 dB.
With the equipment connected as shown and a 50  termination on the T-connector (A), measure
the received signal voltage VL in dBV at the signal output port (B).
Leaving the RF output of the signal generator unchanged, transfer the 50  termination to the
signal output port (B) and transfer the receiver input cable to the T-connector (A). Measure the
drive signal voltage VD in dBV.
Subtract VL from VD and add 6 dB to obtain the antenna factor (in dB) of the antenna.
Records providing evidence that the required final inspection and tests are carried out shall be
maintained and shall be available for review by the customer and third party inspectors. Such
records include signed off ITPs, job cards, nonconformance reports, test reports and inspection
reports, if any.
NOT – The signal generator does not need to be calibrated, but it shall be stable. The 50 
termination shall have low VSWR. The spectrum analyzer shall be calibrated and have low VSWR.
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A.H. Systems Model SAS-551 Passive Monopole Antenna
MAINT NANC
To ensure reliable and repeatable long-term performance, annual
re-calibration of your active monopole preamplifier by A.H.
Systems’ experienced technicians is recommended. Our staff can
recalibrate almost any type or brand of antenna.
For more information about our calibration services or to place an
order for antenna calibration, visit our website at
www.AHSystems.com or call [phone].
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A.H. Systems Model SAS-551 Passive Monopole 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.
xcept 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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