ESCO Technologies ETS-Lindgren 7405 Manuale utente

Model 7405

Near-Field Probe Set

User Manual

ii www.ets-lindgren.com

www.ets-lindgren.com iii

ETS-Lindgren Inc. reserves the right to make changes to any product described

herein in order to improve function, design, or for any other reason. Nothing

contained herein shall constitute ETS-Lindgren Inc. assuming any liability

whatsoever arising out of the application or use of any product or circuit

described herein. ETS-Lindgren Inc. does not convey any license under its

patent rights or the rights of others.

of this document may be copied by any means without written permission

from ETS-Lindgren Inc.

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

ETS-Lindgren Inc.

Revision Record | MANUAL,7405 PROBE SET | Part #399107, Rev. K

Revision Description Date

A–E

•Initial Release

•Updates / edits

February, 1996–January, 1999

F Updated Preamplifier

Gain chart; rebrand October, 2009

Updated

measurement and

characterization

information

May, 2013

H Added temperature

range July, 2016

J Removed references

to battery/charger January, 2019

K Warranty information

removed February, 2022

iv www.ets-lindgren.com

Table of Contents

Notes, Cautions, and Warnings............................................... vi

Safety Information .................................................................... vi

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

Magnetic (H) Field Probes .......................................................................... 8

Electric (E) Field Probes ............................................................................. 8

Ball Probe ........................................................................................... 9

Stub Probe.......................................................................................... 9

Standard Configuration ............................................................................... 9

Optional Items (Sold Separately) .............................................................. 10

ETS-Lindgren Product Information Bulletin ............................................... 10

2.0 Maintenance ....................................................................... 11

Service Procedures .................................................................................. 11

3.0 Specifications..................................................................... 13

Model 7405............................................................................................... 13

Preamplifier .............................................................................................. 13

4.0 Operation ............................................................................ 15

Typical Configuration ................................................................................ 15

Probe Selection ........................................................................................ 16

Preamplifier Use ....................................................................................... 17

5.0 Typical Performance Factors ........................................... 19

Magnetic (H) Field Probes ........................................................................ 20

901 (6-cm Loop) ............................................................................... 20

902 (3-cm Loop) ............................................................................... 21

903 (1-cm Loop) ............................................................................... 22

Electric (E) Field Probes ........................................................................... 23

904 (Ball Probe)................................................................................ 23

905 (Stub Probe) .............................................................................. 24

Preamplifier Gain ...................................................................................... 25

0.01 MHz –3 GHz ............................................................................. 25

6.0 Common Diagnostic Techniques..................................... 27

Locating Radiating Sources ...................................................................... 27

www.ets-lindgren.com v

Signal Demodulation......................................................................... 29

Examples.......................................................................................... 30

Using Sniffer Probes ......................................................................... 32

Diagnosing Radiation Causes................................................................... 33

Common and Differential Mode Current Flow.................................... 35

Differential Mode Techniques............................................................ 40

Common Mode Techniques .............................................................. 42

Pre-Screening Alternate Solutions ............................................................ 43

Evaluating Alternate Solutions .......................................................... 46

Appendix A: EC Declaration of Conformity .......................... 49

vi www.ets-lindgren.com

Notes, Cautions, and Warnings

Note: Denotes helpful information intended to provide tips for better

use of the product.

Caution: Denotes a hazard. Failure to follow instructions

could result in minor personal injury and/or property

damage. Included text gives proper procedures.

Warning: Denotes a hazard. Failure to follow instructions

could result in SEVERE personal injury and/or property

damage. Included text gives proper procedures.

Note: See the ETS-Lindgren Product Information Bulletin for safety,

regulatory, and other product marking information.

Safety Information

High Voltage: Indicates presence of hazardous voltage.

Unsafe practice could result in severe personal injury or

death.

www.ets-lindgren.com Introduction

1.0 Introduction

The ETS-Lindgren Model 7405

Near-Field Probe Set includes three

magnetic (H) field and two electric (E)

field passive, near-field probes designed

for use in the resolution of emissions

problems.

The Model 7405 provides a

self-contained means of accurately

detecting H-field and E-field emissions,

and includes a 20 cm extension handle

to provide access to remote areas in

larger units. Made of injection molded

industrial grade plastic, the probes are

durable, light weight, and compact.

The probes provide a fast and easy means of detecting and identifying signal

sources that could prevent a product from meeting federal regulatory

requirements. This set is a convenient and inexpensive tool for extending the

capability of a spectrum analyzer, oscilloscope, or signal generator.

A near-field probe is an essential tool for quick and efficient EMC/EMI

engineering. Using near-field probes and an oscilloscope can produce the

following results:

•Gain information about the source and location of the radiation

member.

•Reduce test expense by adding inexpensive equipment for solving

EMC/EMI problems.

The Model 7405 is used for diagnostics purposes, and does not

require calibration.

8Introduction

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Magnetic (H) Field Probes

The Model 7405 includes three

H-field probes of varying size and

sensitivity: models 901, 902,

and 903. These probes are highly

selective of the H-field while being

relatively immune to the E-field.

Each H-field probe contains a

single turn, shorted loop inside a

balanced E-field shield. The loops

are constructed by taking a single

piece of 50 ohm, semi-rigid coax

from the connector and turning it

into a loop. When the end of the

coax meets the shaft of the probe,

both the center conductor and the

shield are 360 degrees soldered to

the shield at the shaft.

Then a notch is cut at the high point of the loop. This notch creates a balanced

E-field shield of the coax shield. The loops reject E-field signals due to the

balanced shield.

Electric (E) Field Probes

The Model 7405 includes two E-field probes: the stub probe (model 904) and the

ball probe (model 905). Due to the small sensing element, the stub probe is

relatively insensitive. This is an advantage when the precise location of a

radiating source must be determined. For example, while moving the stub probe

over the pins of an IC chip, variations can be noted at spaces as close as two or

three pins.

By comparison, the ball probe is much more sensitive. The larger sensing

element does not offer the highly-refined definition of the source location which

the stub probe allows, but it is capable of tracing much weaker signals. The

impedance of the stub probe is essentially the same as that of a non-terminated

length of 50 ohm coaxial cable.

www.ets-lindgren.com Introduction

BALL PROBE

The shaft of the model 904

ball probe is constructed of a

length of 50 ohm coax. The coax is

terminated with a 50 ohm resistor

in order to present a conjugate

termination to the 50 ohm line. The

center conductor is extended

beyond the 50 ohm termination

and attached to a 3.6-cm diameter

metal ball, which serves as an

E-field pick up. The absence of a

closed loop prevents current flow,

allowing the ball probe to reject the

H-field.

STUB PROBE

The model 905 stub probe is made of a

single piece of 50 ohm, semi-rigid coaxial

cable with 6 mm of the center conductor

exposed at the tip. This short length of

center conductor serves as a monopole

antenna to pick up E-field emanations.

With no loop structure to carry current, the

stub probe rejects the H-field.

Standard Configuration

•H-field probes (3)

•E-field probes (2)

•20 cm extension handle

•Carrying case

10 Introduction

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Optional Items (Sold Separately)

•Preamplifier, including wall-mounted power supply (115 VAC or

230 VAC available)

ETS-Lindgren Product Information Bulletin

See the ETS-Lindgren Product Information Bulletin included with your shipment

for the following:

•Warranty information

•Safety, regulatory, and other product marking information

•Steps to receive your shipment

•Steps to return a component for service

•ETS-Lindgren calibration service

•ETS-Lindgren contact information

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