Ets-lindgren 7405 E & H Near Field Probe Set Manual do Utilizador

Model 7405 Near-Field Probe Set User Manual

10 Introduction www.ets-lindgren.com Optional Items  Preamplifier, including wall-mounted power supply (115 VAC or 230 VAC available)  Preamplif

www.ets-lindgren.com Maintenance 11 2.0 Maintenance Before performing any maintenance, follow the safety information in the ETS-Lindgren Product

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www.ets-lindgren.com Electrical Specifications 13 3.0 Electrical Specifications Model 7405 Primary Sensor Type E/H or H/E Rejection Upper Resonan

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www.ets-lindgren.com Operation 15 4.0 Operation Before connecting any components, follow the safety information in the ETS-Lindgren Product Infor

16 Operation www.ets-lindgren.com Probe Selection Choosing the correct probe is determined by the following:  Whether the signal is E or H: If the

www.ets-lindgren.com Operation 17  How closely you want to define the location of the source: Choose the probe that gets as close to the signal so

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www.ets-lindgren.com Typical Performance Factors 19 5.0 Typical Performance Factors The following graphs represent typical measurement. Individua

ii www.ets-lindgren.com ETS-Lindgren Inc. reserves the right to make changes to any product described herein in order to improve function, design, or

20 Typical Performance Factors www.ets-lindgren.com Magnetic (H) Field Probes 901 (6-CM LOOP)

www.ets-lindgren.com Typical Performance Factors 21 902 (3-CM LOOP)

22 Typical Performance Factors www.ets-lindgren.com 903 (1-CM LOOP)

www.ets-lindgren.com Typical Performance Factors 23 Electric (E) Field Probes 904 (BALL PROBE)

24 Typical Performance Factors www.ets-lindgren.com 905 (STUB PROBE)

www.ets-lindgren.com Typical Performance Factors 25 Preamplifier Gain 0.01 MHZ –3 GHZ

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www.ets-lindgren.com Common Diagnostic Techniques 27 6.0 Common Diagnostic Techniques Before connecting any components, follow the safety informa

28 Common Diagnostic Techniques www.ets-lindgren.com The various specifications are given in the frequency domain, so there are many dBuV at a parti

www.ets-lindgren.com Common Diagnostic Techniques 29 SIGNAL DEMODULATION To demodulate a signal: 1. Set the spectrum analyzer for a 0 Hz frequenc

www.ets-lindgren.com iii Table of Contents Notes, Cautions, and Warnings ... v 1.0 Introduction ...

30 Common Diagnostic Techniques www.ets-lindgren.com 3. Obtain a clear picture of the signal produced on the oscilloscope. You now have a good repr

www.ets-lindgren.com Common Diagnostic Techniques 31 If the problem is caused by a rise or fall time, you may be looking for a waveform component wh

32 Common Diagnostic Techniques www.ets-lindgren.com USING SNIFFER PROBES Typically, there are several possible sources for a given signal. To ident

www.ets-lindgren.com Common Diagnostic Techniques 33 Diagnosing Radiation Causes A small sniffer probe can help diagnose the cause of an electromagn

34 Common Diagnostic Techniques www.ets-lindgren.com Radiation is caused by an instantaneous change in current flow, causing a magnetic field, or by

www.ets-lindgren.com Common Diagnostic Techniques 35 COMMON AND DIFFERENTIAL MODE CURRENT FLOW From the local perspective of the unit, this is a c

36 Common Diagnostic Techniques www.ets-lindgren.com To review the physics of the situation: In a far-field that is more than about one wavelength f

www.ets-lindgren.com Common Diagnostic Techniques 37 Distance: A to B = 1.5 2.0 3.0 Propagating Field: 1/R –3.52 dB –6.02 dB –9.54 dB Reactive Field

38 Common Diagnostic Techniques www.ets-lindgren.com  Differential mode data is generally well behaved. The amplitude measured with the H-field

www.ets-lindgren.com Common Diagnostic Techniques 39 A qualitative knowledge of the field impedance indicates how to approach the EMC/EMI design for

iv www.ets-lindgren.com Examples ... 30 Using Sniffer Probes .

40 Common Diagnostic Techniques www.ets-lindgren.com DIFFERENTIAL MODE TECHNIQUES Some traditional differential mode techniques do not work in comm

www.ets-lindgren.com Common Diagnostic Techniques 41  Reducing the signal voltage swing: This will be ineffective when the radiating potential is

42 Common Diagnostic Techniques www.ets-lindgren.com COMMON MODE TECHNIQUES Some traditional common mode techniques do not work in differential mod

www.ets-lindgren.com Common Diagnostic Techniques 43  Increasing decoupling of power to ground.  Reduce lead or trace inductance by reducing the

44 Common Diagnostic Techniques www.ets-lindgren.com Evaluating various solutions requires great skill and awareness, and it is in this area that th

www.ets-lindgren.com Common Diagnostic Techniques 45 2. The probe becomes part of the circuit during near-field measurements. There is capacitanc

46 Common Diagnostic Techniques www.ets-lindgren.com EVALUATING ALTERNATE SOLUTIONS There are two approaches that yield good results when evaluating

www.ets-lindgren.com Common Diagnostic Techniques 47 The more distant measurement points may lose the signal into the system noise; a given solution

48 Common Diagnostic Techniques www.ets-lindgren.com 3. The technique was improperly applied. 4. An outside factor is involved, such as a second s

www.ets-lindgren.com Warranty 49 Appendix A: Warranty See the Product Information Bulletin included with your shipment for the complete ETS-Lindgr

www.ets-lindgren.com v Notes, Cautions, and Warnings Note: Denotes helpful information intended to provide tips for better use of the product. Caut

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www.ets-lindgren.com EC Declaration of Conformity 51 Appendix B: EC Declaration of Conformity

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www.ets-lindgren.com Introduction 7 1.0 Introduction The ETS-Lindgren Model 7405 Near-Field Probe Set includes three magnetic (H) field and two el

8 Introduction www.ets-lindgren.com Magnetic (H) Field Probes The Model 7405 includes three H-field probes of varying size and sensitivity: models 9

www.ets-lindgren.com Introduction 9 BALL PROBE The shaft of the model 904 ball probe is constructed of a length of 50 ohm coax. The coax is terminat