COM-power corporation AL-RE101 User manual

Page 1 of 26
INSTRUCTION MANUAL
AL-RE101 LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
Rev101617
INSTRUCTION MANUAL
for
LOOP ANTENNA
Model: AL-RE101

Page 2 of 26
INSTRUCTION MANUAL
AL-RE101 LOOP ANTENNA

- TABLE OF CONTENTS -
19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
Rev101617
Table of Contents
1.0 Introduction ........................................................................................................... 4
2.0 Products Available from Com-Power ................................................................. 5
3.0 Product Information .............................................................................................. 6
3.1 Incoming Inspection............................................................................................................... 6
3.2 Package Inventory ................................................................................................................. 6
3.3 Product Features ..................................................................................................................... 7
3.4 Product Specifications............................................................................................................ 8
4.0 Using Your AL-RE101 Loop Antenna .................................................................... 9
4.1 Antenna Conversion Factors................................................................................................ 10
4.1.1 Interpolation of Antenna Conversion Factors ........................................................... 12
5.0 Antenna Theory................................................................................................... 13
5.1 Open Circuit Antenna Terminal Voltage vs Flux Density ................................................... 13
5.2 Determination of Antenna Conversion Factors .................................................................. 15
5.2.1 Derivation of Antenna Conversion Factor Equation ................................................ 17
6.0 Calibration and Calibration Cycle.................................................................... 19
6.1 Calibration Equipment.......................................................................................................... 19
6.1.1 Source Equipment.......................................................................................................... 20
6.1.2 Measuring Instruments ................................................................................................... 20
6.1.3 Transmitting Loop Antenna........................................................................................... 20
6.1.4 Precision 1-ohm Series Resistor ..................................................................................... 20
6.1.5 RF Current Probe ............................................................................................................ 20
6.2 Interpretation of Standards................................................................................................... 21
6.3 Calibration Methodology ..................................................................................................... 22
7.0 Warranty............................................................................................................... 24
8.0 Maintenance....................................................................................................... 25
9.0 Typical Performance Data ................................................................................. 26

Page 3 of 26
INSTRUCTION MANUAL
AL-RE101 LOOP ANTENNA

- LIST OF FIGURES -
19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
Rev101617
List of Figures
FIGURE 1 - AL-RE101 Features 7
FIGURE 2 - AL-RE101 Loop Antenna Dimensions 8
FIGURE 3 - Typical Test Arrangement 9
FIGURE 4 - Antenna Conversion Factors 10
FIGURE 5 - Typical Measurement Setup for Calibration (1Resistor Method) 19
FIGURE 6 - Typical Measurement Setup for Calibration (Current Probe Method) 19

Page 4 of 26
INSTRUCTION MANUAL
AL-RE101 LOOP ANTENNA

SECTION 1 - INTRODUCTION
19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
Rev101617
1.0 Introduction
This manual includes descriptions of product features; product specifications, safety
precautions, operational instructions, antenna theory, measurement guidelines, warranty
and product maintenance information.
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 26
INSTRUCTION MANUAL
AL-RE101 LOOP ANTENNA

SECTION 2 - PRODUCTS AVAILABLE FROM COM-POWER
19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
Rev101617
2.0 Products Available from Com-Power
www.com-power.com

Page 6 of 26
INSTRUCTION MANUAL
AL-RE101 LOOP ANTENNA

SECTION 3 - PRODUCT INFORMATION
19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
Rev101617
3.0 Product Information
3.1 Incoming Inspection
Please check the contents of the shipment against the package inventory in
section 3.2 to ensure that you have received all applicable items.
3.2 Package Inventory
STANDARD ITEMS:
•AL-RE101 Loop Antenna
•Calibration Data and Certificate

Page 7 of 26
INSTRUCTION MANUAL
AL-RE101 LOOP ANTENNA

SECTION 3 - PRODUCT INFORMATION
19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
Rev101617
3.3 Product Features
FIGURE 1 - AL-RE101 Features
Antenna Output Port
1
Coaxial BNC port for connection to input port of measuring instrumentation.
7 cm Spacing
2
The 7 cm spacing required for MIL-STD 461, RE101 is achieved when the front edge of the
plexi-glass bottom plate of the antenna assembly is positioned perpendicularly against the
EUT surface.
Loop Coil
3
Contained within the electrostatic shield is the loop coil consisting of 36 turns of 41 gauge,
7-strand Litz wire.
Electrostatic Shield
4
The powder coated metallic structure housing the loop coil serves as the electrostatic shield
for the loop.
7 cm
2
1
3
4

Page 8 of 26
INSTRUCTION MANUAL
AL-RE101 LOOP ANTENNA

SECTION 3 - PRODUCT INFORMATION
19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
Rev101617
3.4 Product Specifications
Frequency Range 30 Hz to 100 kHz (usable range: 10 Hz to 1 MHz)
Standard(s) MIL-STD-461, RE101
Loop Diameter (outside) 13.3 cm (5.24 in.)
Number of Turns (N) 36 Turns
Wire Type 7 Strand, 41 AWG Litz Wire
Loop Shielding Electrostatic Shield
Resistance of Loop Coil (RC)10Ω(nominal)
Inductance of Loop Coil (L) 340 μH (nominal)
Connector Coaxial BNC (female)
Weight 0.84 lbs. (0.38 kg)
Operating Temperature 40°F to 104°F (5°C to 40°C)
FIGURE 2 - AL-RE101 Loop Antenna Dimensions
(W) 6”
15.35 cm
4.5”
11.5 cm
(L) 3.8”
9.7 cm
0.66”
1.66 cm
AL-RE101
LOOP ANTENNA
30 Hz to 100 kHz
4.5”
11.5 cm (H) 7.48”
19 cm
6”
15.35 cm
4.5”
11.5 cm (H) 7.48”
19 cm
6”
15.35 cm
2.8”
7 cm

Page 9 of 26
INSTRUCTION MANUAL
AL-RE101 LOOP ANTENNA

SECTION 4 - USING YOUR AL-RE101 LOOP ANTENNA
19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
Rev101617
4.0 Using Your AL-RE101 Loop Antenna
The AL-RE101 Loop Antenna should be connected directly to the input port of the
measuring instrument(s). Follow the procedures described in the applicable standard for
the test(s) to be performed.
FIGURE 3 - Typical Test Arrangement
Generally, the AL-RE101 Loop Antenna is intended to be positioned at a 7 cm distance
from the Equipment Under Test (EUT). Due to the small size of the loop coil, its close
proximity to the EUT, and also depending on the size of the EUT, the magnetic field pick-
up of the AL-RE101 Loop Antenna may be sensitive to small movements over the surfaces
of the EUT.
Therefore, as described in MIL-STD-461, the antenna position should be slowly scanned
over the face of the EUT and around the connectors, in order to find the point(s) of
maximum radiation.
LISN
EUT
Power
Input
Measurement
Instrument
AL-RE101
Loop Antenna
7 cm

Page 10 of 26
INSTRUCTION MANUAL
AL-RE101 LOOP ANTENNA

SECTION 4 - USING YOUR AL-RE101 LOOP ANTENNA
19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
Rev101617
4.1 Antenna Conversion Factors
Your AL-RE101 Loop Antenna is provided with two sets of antenna conversion
factors. The input impedance of your measuring instrument determines which
factor to use, as described below.
The 50 ohm antenna conversion factors are the most commonly applied. These
are to be used when the AL-RE101 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 1 MHz, as shown in Figure 4. To
find the factors for frequencies between those listed on the table, see section
4.1.1.
The 100 kfactors are used when the AL-RE101 Loop Antenna is connected to a
measuring instrument with a high input impedance (greater than approximately
500 ohms). These factors are provided over the truncated frequency range of 10
Hz to 50 kHz, also as shown in Figure 4. The antenna should generally not be used
above 50 kHz without a 50 ohm termination.
FIGURE 4 - Antenna Conversion Factors
Antenna Type Loop Antenna
Model AL-RE101
FREQUENCY
100 kΩ 50Ω
(kHz) [dBpT/μV] [dBpT/μV]
0.01 90.1 91.6
0.02 84.1 85.7
0.03 80.5 82.1
0.05 76.1 77.7
0.1 70.1 71.7
0.2 64 65.6
0.3 60.6 62.2
0.5 56.1 57.7
150.151.7
244.145.7
340.542.2
536.137.8
10 30.1 32.2
20 24.1 27.4
30 20.5 25.4
50 16.2 23.9
100 23
200 22.8
300 22.7
500 22.7
1000 22.7
ANTENNA CONVERSION FACTORS