ETS-Lindgren 3301B User Manual

Model 3301B

Archived 3/18/10

Active Rod & Field

Antenna

User Manual

ETS-Lindgren L.P. reserves the right to make changes to any products herein to improve

Archived 3/18/10

functioning or design. Although the information in this document has been carefully reviewed and
is believed to be reliable, ETS-Lindgren does not assume any liability arising out of the
application or use of any product or circuit described herein; nor does it convey any license under
its patent rights nor the rights of others. All trademarks are the property of their respective
owners.

©Copyright 2000–2006 by ETS-Lindgren L.P. All Rights Reserved. No part of this
document may be copied by any means without written permission from
ETS-Lindgren L.P.

Trademarks used in this document: The ETS-Lindgren logo is a trademark of ETS-Lindgren L.P.

Revision Record | MANUAL 3301B, Part #399046, Rev. K

Revision Description Date

A – J Initial Release, edits/updates Through September, 2003
K Edited rod capacitance, template/format November, 2006

Internet Address

http://www.ETS-Lindgren.com

USA

1301 Arrow Point Drive
Cedar Park, TX 78613 USA
Tel: [phone]
Fax: [phone]
Email: [e-mail]

Japan

4-2-6, Kohinata
Bunkyo-ku, Tokyo 112-0006 Japan
Tel: [phone]
Fax: [phone]
Email: [e-mail]

Finland

Mekaanikontie 1, 27510
Eura, Finland
Tel: [phone]
Fax: [phone]
Email: [e-mail]

China

B507A Technology Fortune Center
No8 Xue Qing Road
Haidian District
Beijing Postcode: 100083 China
Tel: [phone]
Fax: [phone]
Email: [e-mail]

ii |

Table of Contents

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Safety Symbol Definitions ................................................................................................................. v

General Safety Considerations ......................................................................................................... v

1.0 Introduction ................................................................................................................................ 7

2.0 Receiving Your Order ................................................................................................................ 9

2.1 Unpacking and Acceptance ................................................................................................... 9

2.2 Service Procedures ................................................................................................................ 9

3.0 Maintenance ............................................................................................................................ 11

3.1 Maintenance Recommendations ......................................................................................... 11

3.2 Replacement and Optional Parts ......................................................................................... 11

4.0 Standard Configuration ............................................................................................................ 13

4.1 Options ................................................................................................................................. 13

5.0 Specifications .......................................................................................................................... 15

5.1 Operational Specifications ................................................................................................... 15

5.1.1 Table of Acceptable Pulse Repetition Rates ................................................................. 16

5.2 Electrical Specifications ....................................................................................................... 16

5.3 Mechanical Specifications.................................................................................................... 17

6.0 Principles of Operation ............................................................................................................ 19

6.1 Description ........................................................................................................................... 19

6.2 Front Panel .......................................................................................................................... 19

6.3 Internal Options .................................................................................................................... 20

6.3.1 Factory Settings ............................................................................................................ 21

6.3.2 Proper Selection of Internal Attenuation ....................................................................... 22

7.0 Power Circuitry ........................................................................................................................ 23

7.1 Voltage-Selectable Battery Charger .................................................................................... 23

7.1.1 Operation ....................................................................................................................... 23

7.1.2 Specifications ................................................................................................................ 24

7.2 Battery Low Indicator ........................................................................................................... 24

7.3 Fuses ................................................................................................................................... 24

8.0 Setup and Use ......................................................................................................................... 27

8.1 Setup .................................................................................................................................... 27

8.2 High Sensitivity Readings .................................................................................................... 28

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9.0 Theory of Operation ................................................................................................................. 29

9.1 The Rod ............................................................................................................................... 29

9.2 The Pre-Amplifier ................................................................................................................. 30

10.0 The Antenna Factor ............................................................................................................... 33

11.0 Antenna Impulse Response .................................................................................................. 35

11.1 Impulse Characteristics ...................................................................................................... 35

11.2 Pulse Desensitization ......................................................................................................... 36

11.3 Pulse Charging .................................................................................................................. 37

12.0 Calibration Procedure ............................................................................................................ 39

Appendix A: Warranty Policy for Standard EMCO Brand Products .............................................. 41

Scope and Duration of Warranties ............................................................................................. 41

Warranty Exclusions .................................................................................................................. 41

Buyer’s Remedies ...................................................................................................................... 42

Appendix B: European Community Declaration of Conformity ..................................................... 45

Appendix C: Data and Illustrations ................................................................................................ 47

Periodic Rectangular Pulse Train .............................................................................................. 47

Spectrum of Rectangular Pulse ................................................................................................. 47

Altering Pulse Width / Pulse Repetition Rate ............................................................................. 48

Active Electric Field Antenna Calibration Fixture ....................................................................... 49

Active Rod Antenna Calibration Setup ...................................................................................... 50

Typical Curves—Minimum Discernible Signal at Various Bandwidths ...................................... 51

Typical Attenuation Effect for Switches 1 and 2 ........................................................................ 52

Typical Roll Off Curves for Switches 3 and 4 ............................................................................ 53

Typical Roll Off Curves—41” Rod Antenna, 0 dB Attenuation .................................................. 54

Typical Roll Off Curves—41” Rod Antenna, 10 dB Attenuation ................................................ 55

Typical Roll Off Curves—41” Rod Antenna, 30 dB Attenuation ................................................ 56

iv |

Safety Symbol Definitions

Archived 3/18/10

This product and related documentation must be reviewed for familiarization with
safety markings and instructions prior to operation of the product.

Safety Symbol Definition

REFER TO MANUAL—When the product is marked with this symbol

refer to the instruction manual for additional information. If the

!

OR

instruction manual has been misplaced, go to www.ets-lindgren.com
downloadable files or contact ETS-Lindgren customer service.

for

CAUTION—Denotes a hazard. Failure to follow instructions could result
in minor personal injury and/or property damage. Text that follows the
symbol will provide proper procedures.

General Safety Considerations

Safety Symbol Definition

BEFORE SERVICING: CONTACT ETS-LINDGREN
(+1.512.531.6400)—Servicing or modifying the unit without

WARRANTY

ETS-Lindgren authorization may void your warranty. If an attempt to
service the unit must be made, disconnect all electrical power prior to
beginning. Voltages exist at many points within the instrument that
could, if contacted, cause personal injury. Only trained service
personnel should perform adjustments and/or service procedures upon
this instrument. Capacitors inside this instrument may still be charged

even when the instrument is disconnected from the power source.

ONLY QUALIFIED PERSONNEL should operate or service this
equipment.

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vi |

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1.0 Introduction

The ETS-Lindgren Model 3301B is a broadband, high sensitivity electric-field
receiving antenna. The Model 3301B is composed of a monopole rod antenna
with a counterpoise, and a broadband, high impedance pre-amplifier. It is
designed to provide reception of an electric field in a signal band without tuning
or band switching from 30 Hz to 50 MHz. The 3 dB roll off points for the antenna
factor are at 170 Hz and 30 MHz. Between 250 Hz and 20 MHz, the antenna
factor is flat within +/- 1 dB. Despite the roll of the antenna factor, the usable
range is 30 Hz to 50 MHz.

The Model 3301B is designed for maximum sensitivity and dynamic range, and is
capable of sensing fields of 2 dBuV/m at 1 MHz with a 1 kHz bandwidth.
However, it will not saturate below a field strength of 0.7 V/m. As a result, the unit
boasts an extremely wide dynamic range of 115 dB nominal at mid-band. In
addition, at 10 and 30 dB (+/-10%), internal attenuators are provided. With the
attenuators the Model 3301B is usable in fields of up to 22 V/m. Therefore, the
dynamic range of the unit is expanded to 145 dB. A saturation indicator is
provided to alert the user to the need for using the internal attenuators

The Model 3301B is designed to provide the user with an extremely versatile
measurement tool. The flat antenna factor, extreme sensitivity, and ultra-wide
dynamic range make it a state of the art sensing instrument.

Introduction | 7

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8 | Introduction

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2.0 Receiving Your Order

2.1 Unpacking and Acceptance

Step 1. Upon delivery of your order, inspect the shipping container(s) for

evidence of damage. Record any damage on the delivery receipt before signing
it. In case of concealed damage or loss, retain the packing materials for
inspection by the carrier.

Step 2. Remove the product from its shipping container(s). Save the container(s)
and any protective packing materials for future use.

Step 3. Check all materials against the packing list to verify that the equipment
you received matches what was ordered. If you find any discrepancies, note
them and call ETS-Lindgren Customer Service for further instructions.

Make sure you are satisfied with the contents and condition of your order prior to
placing the product into service.

2.2 Service Procedures

To return a system or system component for service:

Step 1. Contact ETS-Lindgren Customer Service to obtain an SRO, Service
Request Order.

Step 2. Briefly describe the problem in writing. Give details regarding the
observed symptom(s) or error codes, and whether the problem is constant or
intermittent in nature. Please include the date(s), the service representative you
spoke with, and the nature of the conversation. Include the serial number of the
item being returned.

Step 3. Package the system or component carefully. If possible, use the original
packing materials to return a system or system component to ETS-Lindgren at
the following address:

ETS-Lindgren

Attn: Service Department

301 Arrow Point Drive

Cedar Park, TX, USA 78613

Phone: [phone]

Customer Service: +1.512.531.6498

Receiving Your Order | 9

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10 | Receiving Your Order

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3.0 Maintenance

3.1 Maintenance Recommendations

To ensure reliable and repeatable long-term performance, annual recalib ration of
your antenna by an ETS-Lindgren experienced technician is recommended. Our
staff can recalibrate almost any type or brand of antenna. Please call to receive a
Service Order Number prior to sending an antenna for calibration.

For more information about our calibration services, visit our website at

http://www.ETS-Lindgren.com

3.2 Replacement and Optional Parts

Use the following tables to order replacement or optional parts for the
Model 3301B.

Replacement Part Part Number

.

Collapsible Rod Element 41” 101263C
24” x 24” Counterpoise 100692
Rod Antenna Pre-Amplifier 100697B
Battery Charger 102615

Model 3301B Active Rod & Field
Antenna User Manual

Table 1: Replacement Parts List

Optional Part Part Number

3301B Calibration Fixture 3301CB
Tripod, Linen Phenolic 3-TR
Remote Status Monitor 3301B-RM
25” Cable RG-223/U with BNC

Connectors
Replacement Batteries, 6V (2 required) 400009

399046

C-BNC

Table 2: Optional Parts List

Maintenance | 11

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12 | Maintenance

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4.0 Standard Configuration

• Adjustable monopole element

• Antenna base with built-in preamplifier and an isolated female BNC connector

• Counterpoise (60 cm)

• Base drilled to accept EMCO or other tripod mounts with standard ¼” x 20 threads

• Batteries and battery charger

• Individually calibrated per ECSM or IEE Std. 291. Actual individual calibration

factors and signed Certificate of Calibration Conformance included with the
manual.

4.1 Options

REMOTE MONITOR

A 10-meter (32.8 ft) fiber optic Remote Monitor Option for remote display of
power-on and saturation indicators.

TRIPODS

ETS-Lindgren offers two nonmetallic, non-reflective tripods for use at both indoor
and outdoor EMC test sites.

• Model 4-TR—Constructed of linen phenolic and delrin, designed with
an adjustable center post for precise height adjustments. Maximum
height for the 4-TR is 2.0 m (80.0 in), and minimum height is 94 cm
(37.0 in). This tripod can support up to an 11.8 kg (26.0 lb) load.

• Model 7-TR—Allows several different configurations, including options
for manual or pneumatic polarization. The 7-TR provides increased
stability for physically large antennas. The unique design allows for
quick assembly, disassembly, and convenient storage. Quick height
adjustment and locking wheels provide ease of use during testing. This
tripod can support a 13.5 kg (30 lb) load. For the 7-TR series,
maximum height is 2.17 m (85.8 in), with a minimum height of .8 m
(31.8 in). The 7-TR is constructed of PVC and fiberglass components.

Standard Configuration | 13

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14 | Standard Configuration

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5.0 Specifications

5.1 Operational Specifications

Frequency Range:

Low Frequency Roll Off:

High Frequency Roll Off:

Antenna Factor:

Saturation Level:

30 Hz to 50 MHz (maximum usable
bandwidth)

The low frequency roll off is switch
selectable to be 3 dB down at 22 kHz,

1.9 kHz, or 170 Hz.

Antenna factor is 3 dB down at 30 MHz

See data graphs included with manual. The
calibration graphs were taken in the low
gain setting. Unless otherwise noted, the
low frequency roll off is set at the 170 Hz
3 dB roll off point.

• 0.7 V/m narrowband without attenuation
and at the low gain setting

• 22 V/m with 30 dB of internal attenuation
selected

• 63 dBuV/m/MHz broadband saturation
level

Minimum Discernible Signal:

Dynamic Range:

See data graphs included with manual. For
best sensitivity the unit should be in the low
gain setting with all internal attenuation off.

• 115 dB at mid-band (1 MHz)

• 145 dB with the use of the internal

attenuators

Specifications | 15

Archived 3/18/10

Saturation Indicator Impulse Response:

5.1.1 Table of Acceptable Pulse Repetition Rates

Duty Cycle Maximum PRF

10 19.7 MHz
20 14.0 MHz
30 9.2 MHz
40 5.6 MHz
50 420.0 kHz
60 130.0 kHz
70 87.0 kHz
80 57.0 kHz
90 30.0 kHz

The saturation indicator will properly
indicate saturation for pulsed signals which
fall within the following boundaries:

1. The product of the pulse width to pulse
repetition rate must be greater than .003.

2. The pulse repetition rate must be less
than value listed for the applicable duty
cycle. See the following Table of
Acceptable Pulse Repetition Rates.

5.2 Electrical Specifications

Input Impedance:

Output Impedance:

Saturation Impedance:

Battery Low Indicator:

The input impedance determines the low
frequency roll of point. Depending on the
low frequency roll off selected, the input
impedance is >20 megohms, 1 megohm or
100 kilohm.

50 ohm (nominal)

A red LED on the front panel will illuminate
when the unit begins to saturate or clip. The
saturation indicator will indicate accurately
for any gain and attenuator setting.

The power light on the front panel also
serves as a battery low Indicator. If the
green light does not come on when the
power switch is engaged, then the battery
requires recharging. It is recommended that
the Model 3301B be connected to the
battery charger at all times when not in use.

16 | Specifications

Archived 3/18/10

Batteries:

Battery Charger:

The Model 3301B is supplied with two 6V
sealed lead-acid batteries. The batteries will
operate for approximately 10 hours
between charges.

115/230 VAC 50/60 Hz switch selectable,
IEC input, two-stage battery charger with
fast and trickle charge modes.

• Type 3AG size .5 Amp, fast acting

Fuses:

5.3 Mechanical Specifications

Size:

Weight:

Tripod Mounting:

Counterpoise Mounting:

Antenna Element:

• Or, 5 x 20 mm, .5 Amp, fast acting

• Internally mounted

7.38” x 4.62” x 3.5”

Approximately 7 lbs

A ¼” x 20 hole is provided on the base for
tripod mounting. This is not intended as a
grounding point.

Four 6-32 holes are provided in the two
metal mounting bars on the top of the unit.

The antenna element may be set up to 41”.

Specifications | 17