Com-Power AC-220 User manual
COMBILOG ANTENNA
30 - 2000 MHz
MODEL AC-220
rev: 0202
WARRANTY
All equipment manufactured by Com-Power Corporation is warranted against defects in
material and workmanship for a period of two (2) years from the date of shipment. Com-Power
Corporation will repair or replace any defective item or material if notified within the warranty
period.
You will not be charged for warranty service performed at our factory. You must, however,
prepay inbound shipping costs and have a return authorization.
This warranty does not apply to:
a) products damaged during shipment from your plant or ours.
b) improperly installed products.
c) products operated outside their specifications.
d) improperly maintained products.
e) products which have been modified.
f) normal wear of material.
g) calibration.
Any warranties or guarantees, whether expressed or implied, that are not specified set forth
herein, will not be considered applicable to any equipment sold or otherwise furnished by Com-
Power Corporation. Under no circumstances does Com-Power Corporation recognize or assume
any liability for any loss, damage or expense arising either directly or indirectly from the use or
handling of products manufactured by Com-Power Corporation, or any inability to use them
separately or in combination with other equipment or material.
The warranty is void if items are shipped outside the United States, without prior approval of
Com-Power Corporation.
Warranty Limitations
The above warranty shall not apply to defects resulting from improper or inadequate maintenance
by the buyer, unauthorized modification or misuse, operation exceeding specifications, or im-
proper site preparation.
AC-220 Combilog Antenna
The Model AC-220 Combilog antenna were designed for use in an EMI
laboratory to measure or generate electric field.
Test Operator and Test Location:
The Model AC-220 antenna should be operated by trained personnel in the field
of EMC for the purpose of generating electromagnetic fields. Test location
should be selected to avoid interference to other equipment and exposure of
personnel to high electromagnetic fields
Maintenance and Service:
There are no user serviceable parts inside the balun. Do not remove the
instrument cover. Com-Power provides calibration service for all equip-
ment sold. Call the factory if calibration or other service is required.
SAFETY PRECAUTIONS
AC-220 Combilog Antenna
About this Manual
This manual provides instructions for testing and using the Combilog
antenna model AC-220.
Information contained in this manual is the property of Com-Power
Corporation. It is issued with the understanding that none of this material
may be reproduced or copied without written permission from Com-
Power.
If you encounter problems while using the model AC-220 antenna contact
Com-Power Corporation at (949) 587-9800.
If You Need
Assistance
iv
AC-220 Combilog Antenna
Contents
v
List of Figures
Section Page
1 General Information ........................................................................1-1
1.1 Introduction .............................................................................................1-1
1.2 General Description.................................................................................1-1
1.3 Equipment Specifications ........................................................................1-2
1.4 Equipment, Accessories, and Documents Supplied.................................1-2
2 Connecting Procedures....................................................................2-1
2.0 Introduction .............................................................................................2-1
2.1 Antenna Setup .........................................................................................2-1
.
3 Theory of Operation.........................................................................3-1
3.0 Overview .................................................................................................3-1
3.1 Theory of Operation ................................................................................3-1
1-1 Combilog antenna mounted on tripod .....................................................1-2
1-2 Antenna factors (typical) .........................................................................1-5
1-1 Equipment Specifications ........................................................................1-4
List of Tables
AC-220 Combilog Antenna
General Information 1
This section includes the following:
a) Introduction
b) General Description
c) Specifications
d) Equipment Supplied
1-1
1.1 Introduction
This section contains general description of the Combilog antenna Mod-
els AC-220. This section also contains general performance and back-
ground information and technical information about the antenna.
1.2 General Description
The Model AC-220 Antenna was specifically designed for radiated EMI
measurement over a wide frequency range. The ModelAC-220 was
designed to receive radiated EMI signals or transmit during susceptibility
testing for various agency specifications.
This antenna is a broadband transducer which converts Electric field
strength in dBuV/m to Volts that can be displayed on a spectrum analyzer
or EMI meter.
Further information on the Combilog antenna is given in Section 3.
1.3 Equipment Specifications
The functional and operational characteristics of the Model AC-220
Combilog antenna are listed in Table 1-1.
AC-220 Combilog Antenna
1-2
Figure 1-1. Combilog mounted on AT-100 tripod.
AC-220 Combilog Antenna
1-3
1.4 Equipment, Accessories, and Documents Supplied
Equipment, accessories, and documents supplied with the model AC-220
Combilog antenna are as follows:
a) Combilog antenna
b) Two (2) rear triangle elements w/screws
c) Tripod mounting adaptor
d) User's guide
e) Individual calibration information
AC-220 Combilog Antenna
1-4
Model: AC-220
Frequency Range: 30 - 2000 MHz
Impedance: 50 ohms nominal
Power Handling: 500 watts CW
Connector: N type (f)
Operating conditions: 0° - 40°C
Weight: 7 lbs.(3.2 kg) max.
Dimensions:
Length 38 in.
Width 51 in.
Height 28 in.
Table 1-1. Equipment Specifications
AC-220 Combilog Antenna
Figure 1-2. AC-220 Typical antenna factor
1-5
0.0
5.0
10.0
15.0
20.0
25.0
30.0
Frequency (MHz)
AC-220 Combilog Antenna
This section explains the following:
a) Introduction
b) Setup
Setup Procedure 22-1
2.0 Introduction
This section describes antenna setup and mounting for EMI measurement.
2.1 Antenna Setup
2.1.1 Connecting
The model AC-220 Combilog antenna has an 'N' type female I/O connector for
connection to measuring or source instrumentation.
2.1.2 Antenna setup for receiving signals
The model AC-220 antenna can be used to measure EMI from an equipment
under test (EUT). The antenna is mounted on either an antenna mast (model
AM-400) or an antenna tripod. The antenna has a universal mount (included) for
mounting on a tripod (AT-100) or other standard tripod. A cable is used to con-
nect the antenna to the measuring instrument. If a long cable is used, cable loss
must be measured and used in calculating the field strength.
2.1.3 Antenna setup for transmitting signals
The model AC-220 antenna can be used to transmit signals. The antenna is
mounted on either on an antenna mast (such Model AM-400 antenna mast ) or
antenna tripod. To transmit signals, the antenna is connected to a signal generator
and power amplifier. The Model AC-220 Combilog antenna can transmit up to
500 Watts continuous power. The field generated by the antenna can be measured
by using field strength meter.
AC-220 Combilog Antenna
2.1.4 Test location
The Combilog antenna must be mounted and placed in area away from other
conductive objects or materials when in use. Large conductive building, struc-
tures and electrical cables, can reflect and reradiate the emissions of EUT, caus-
ing errors in the test data. In addition, care should be taken to keep measuring
instruments and test personnel away from the test area to avoid interference to the
test, as well exposure of test personnel to high electromagnetic fields.
2-2
AC-220 Combilog Antenna
Theory of Operation 3
This chapter explains the following:
a) Overview
b) Theory of Operation
3-1
3.0 OverviewThis section describes the theory of operation of the AC-220 Combilog
antenna.
3.1 Theory of Operation
Broadband antennas allow measurement of signals over a wide frequency
range. These antennas do not require any tuning or balun switching
during measurement. It is very useful for sweep measurement over the
frequency range of operation. Models AC-220 Combilog Antennas is a
broadband antenna that operate in the frequency range of 30 MHz to 2000
MHz.
Before the Combilog antennas are used for measurement they have to be
calibrated. Typically antenna calibration is performed in an open field test
site( OATS). During calibration a known field strength (dBuV/m) is
generated around the antenna at each frequency (30 MHz -2000 MHz).
The difference between field strength (dBuV) received by the antenna and
known field strength generated ( dBuV) is the antenna factor (dB) for that
frequency. During EMC testing the antenna factor for the frequency of
interest is added back to reading on the EMI meter or spectrum analyzer
to measure field strength.
dBuV/m (field strength) = dBuV (output measured) + Antenna Factor
Table of contents
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