Package Inventory ......................... 6 Product Features ........................7 Product Specifications......................9 4.0 Using Your AL-RS101 Loop Antenna Set ............11 General Overview of Set Components ................11 Mounting the AL-RS101-RX Loop onto AL-RS101-TX Loop ..........12 Antenna Conversion Factors....................14 4.
Information contained in this manual is the property of Com-Power Corporation. It is issued with the understanding that the material may not be reproduced or copied without the express written permission of Com-Power.
Page 5 of 31 INSTRUCTION MANUAL AL-RS101 LOOP ANTENNA SET 2.0 Products Available from Com-Power www.com-power.com - P R O D U C T S A V A I L A B L E F R O M C O M - P O W E R S E C T I O N 2 1 9 1 2 1 E l T o r o R d ●...
AL-RS101-TX Loop Antenna AL-RS101-RX Loop Antenna PR10-1E 1Ω (±1%), 10 Watt Precision Resistor Box Teflon spacer attachment for mounting AL-RS101-RX Loop onto the AL-RS101-TX Loop. Non-metallic thumb screw to hold the Teflon spacer attachment in place. Calibration Data and Certificate...
Antenna input port terminals fitted with 4 mm banana jack binding posts. 5 cm Spacing The 5 cm spacing required for MIL-STD 461, RS101 is achieved when the front edge of the Teflon antenna structure is contacted against the surface of the equipment under test (EUT).
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Resistor Input Port Connects to the source equipment. Resistor Output Port Connects to the radiating (or transmitting) loop antenna (usually AL-RS101-TX) Voltage Monitor Port Terminals for monitoring the voltage drop across the resistor. - P R O D U C T I N F O R M A T I O N S E C T I O N 3 1 9 1 2 1 E l T o r o R d ●...
Page 9 of 31 INSTRUCTION MANUAL AL-RS101 LOOP ANTENNA SET Product Specifications AL-RS101-TX AL-RS101-RX 10 Hz to 100 kHz 10 Hz to 100 kHz Frequency Range MIL-STD-461, MIL-STD-461,RS101 Specifications RS101/RE101 12 cm 4 cm Loop Coil Diameter 20 turns...
The AL-RS101 Loop Antenna Set was designed specifically for MIL-STD-461, RS101, radiated susceptibility, magnetic field. Discussed in the following sections are general descriptions of each set component, as well as instructions for mounting the AL-RS101-RX antenna onto the AL-RS101-TX antenna.
SAE ARP958 and during calibration of the field as described in MIL-STD-461. Illustrated in Figure 4 is the method by which the AL-RS101-RX Loop Antenna is mounted onto the AL-RS101-TX Loop Antenna.
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Page 13 of 31 INSTRUCTION MANUAL AL-RS101 LOOP ANTENNA SET Source AL-RS101-TX Loop Antenna Equipment AL-RS101-RX (Transmitting) Loop Antenna (Receiving) Measuring Measuring Instrument #1 Instrument #2 50Ω 50Ω INPUT INPUT 5 cm FIGURE 5 - Setup Diagram for Test Level Calibration...
The 50 ohm antenna conversion factors are the most commonly applied. These are to be used when the AL-RS101-RX Loop Antenna is connected to a measuring instrument having a nominal input impedance of 50 ohms. These factors are provided over the frequency range of 10 Hz to 100 kHz, as shown in Figure 7.
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Page 15 of 31 INSTRUCTION MANUAL AL-RS101 LOOP ANTENNA SET The antenna conversion factor (in dBpT/μV units) is to be added to the measured value (in dBμV) to obtain the corrected magnetic field strength value, or flux density (in dBpT).
Page 16 of 31 INSTRUCTION MANUAL AL-RS101 LOOP ANTENNA SET Interpolation of Antenna Conversion Factors In order to find the antenna conversion factor (ACF) for frequencies between those listed in the table, Equation (2) may be used for interpolation: log(ƒ...
Page 17 of 31 INSTRUCTION MANUAL AL-RS101 LOOP ANTENNA SET 5.0 Antenna Theory This section details the theoretical operation of the AL-RE101 loop antenna. Equation (3) through Equation (7) define the relationship between the average magnetic field strength (or magnetic flux density) within the area of the loop coil and the voltage present at the antenna terminals, in order to determine the antenna conversion factors.
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In the following example, Equation (4) is solved for the magnetic flux density assuming a frequency (ƒ) of 500 Hz, with the AL-RS101-RX Loop Antenna connected to a high impedance oscilloscope input. The measured amplitude is 108 μV, or 40.67 dBμV.
In the formulae below, Equation (6) is reformulated to integrate the actual resistance ), inductance (L), number of turns and coil area for the AL- RS101-RX Loop Antenna; in Equation (7): 2πL ƒ rearranging equation (6) to separate from ƒ...
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In this example, Equation (7) is solved for magnetic flux density assuming a (pT) ƒ) frequency of 500 Hz, with the AL-RS101-RX Loop Antenna connected directly to a spectrum analyzer having an input impedance of 50 ohms, which of 100 μV, or 40 dBμV: indicates a measured amplitude L(μV)
Page 21 of 31 INSTRUCTION MANUAL AL-RS101 LOOP ANTENNA SET 5.2.1 Derivation of Antenna Conversion Factor Equation The formulae below demonstrates the derivation of Equation (6) for determination of the loop antenna conversion factors (ACF). Equation (6a) was introduced earlier as Equation (3). It is borrowed from...
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Page 22 of 31 INSTRUCTION MANUAL AL-RS101 LOOP ANTENNA SET In Equation (6e), Equation (6a) is integrated to substitute for in order to solve for (|B/VL|) EQUATION (6e) (Tesla per Volt [T/V]) 2π ƒ L(V) And finally, in Equation (6f), we multiply by 10 in order to convert the units from Tesla/Volt into pT/μV.
AL-RS101 LOOP ANTENNA SET 6.0 Calibration The only item which requires calibration in the AL-RS101 Loop Antenna Set is the AL- RS101-RX Loop Antenna. The standard SAE ARP958 Rev. D is the applicable calibration standard for this Loop Antenna.
EMI receivers, true rms volt meters, digital multimeters, etc. 6.1.3 Transmitting Loop Antenna The Com-Power AL-RS101-TX Loop Antenna is the ideal antenna to use as the transmitting loop during the calibration. Other transmitting loops may also be used; however, the calibration-related calculations provided in section 6.2 apply only to calibrations performed using the AL-RS101-TX...
AL-RS101 LOOP ANTENNA SET Calibration Methodology The calibration of the AL-RS101-RX antenna is performed by generating a known magnetic field using the AL-RS101-TX Antenna. The calibration is performed with a separation distance of 5 cm between the perpendicular loop antennas, with the centers of the loops aligned along the same axis (coaxially), as shown in Figure 8 and Figure 9.
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40.52 dBμV while 100 mA of current is flowing through the transmit loop coil. The theoretical, 50 ohm antenna conversion factor for the AL-RS101-RX Loop Antenna (calculated using Equation (5) and Equation (7), and as given in the 30 Hz 99.03 dBpT/μV...
(i.e. 100 mA). Step 4) Record the voltage value [in dBμV] measured on Measuring Instrument #2 connected to the AL-RS101-RX Loop Antenna. Step 5) Subtract the voltage value [in dBμV] measured in Step 4 from the flux density value [in dBpT] calculated using Equation 8 for the loop current value reached in Step 3.
±2 dB of the theoretical factors. Com-Power provides the AL-RE101 Loop Antenna individually calibrated as per the procedures described in the SAE ARP958 standard. The acceptance criteria employed dictates that the antenna conversion factors determined during the calibration shall be within ±2 dB of the calculated, theoretical factors.
AL-RS101 LOOP ANTENNA SET 7.0 Warranty Com-Power warrants to its Customers that the products it manufactures will be free from defects in materials and workmanship for a period of three (3) years. This warranty shall not apply to: •...
8.0 Maintenance This product contains no user serviceable parts. If the unit does not operate or needs calibration, please contact Com-Power Corporation. Any modifications or repairs performed on the unit by someone other than an authorized factory trained technician will void warranty.
Page 31 of 31 INSTRUCTION MANUAL AL-RS101 LOOP ANTENNA SET 9.0 Typical Performance Data 50Ω Load Impedance 100 kΩ Load Impedance 0.01 Frequency (MHz) - T Y P I C A L P E R F O R M A N C E D A T A S E C T I O N 9 1 9 1 2 1 E l T o r o R d ●...
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