Evolution Technologies MK-461C Uživatelský manuál stáhnout pdf (Strana 37)

EMC seminar

Field Strength and Antenna factors

Radiated EMI emissions tests measure the electric field. The

field strength is calibrated in dBμV/m.

Antenna factors is the ratio of the electric field (V/m) present

at the plane of the antenna versus the voltage out of the

antenna connector.

Log units:

AF(dB/m) = E(dBμV/m) - V(dBμV)

E(dBμV/m) = V(dBμV) + AF(dB/m)

Notes:

Antenna factors are not the same as antenna gain.

dBμV = dBm + 107

Page 37

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 104 105

Misure di compatibilita’ 1
Elettromagnetica 1
 Soluzioni Agilent 2
What is EMC? 3
Definitions 4
EMI measurement system 6
Pre-compliance measurements 7
Full Compliance measurements 7
CISPR Pulse Generator for 9
Testing the QP response 9
Page 10 10
What is an EMI Receiver? 11
Distortion 12
Theory of Operation 13
Broadband 14
Narrow band 14
Digitizing the IF Signal 15
Some troublesome operations 15
FFT Analyzer 16
Specifications 17
280 sec 17
134 sec 17
13.5 sec 17
Speed Improvements 18
Modern spectrum analyzer 19
Digital Filter Shape 21
CISPR Bandwidth Requirements 22
10 KHz - 150 KHz 1 KHz 23
“Buckets” 24
Detectors 25
Page 26 26
Peak ≧ QP ≧Average 27
RMS Average detector table 29
Page 32 32
Page 33 33
@ 150 kHz to 30 MHz 34
Transient Limiter 35
[ohm] Free Space Impedance 36
Page 37 37
Broadband antenna examples 38
Close field probe 39
Test example 40
EMC Regulations 41
Frequency Bands 43
Page 45 45
CISPR changes… 49
European Norms example 50
MIL-STD 461 Testing 51
Summary 53
Product Life Cycle 54
Cost of retesting 55
EMI problem costs 56
Breadboard/Design 56
Prototype 56
Production 56
Compliance Testing 57
Page 58 58
Page 59 59
Page 60 60
Page 61 61
41.2563MHz 62
218.120MHz 62
1500.260MHz 62
Examples of Test Facilities 63
Open Area Test Site (OATS) 64
GTEM Cell details 65
Test Facilities (cont’d) 66
Page 67 67
Page 68 68
2. Load Corrections factors 69
3. Load Limit line 70
Page 71 71
Page 72 72
X-Series signal analyzer 73
Antennas and tripod 73
Precompliance testing 74
-Measurements repeatability 75
DUT power cord* 76
EMC App 76
3 or 10 Meter distance 77
X-Series Signal Analyzer 77
Troubleshooting 78
Immunity test setup 79
Agilent Solutions 80
Frequency 81
 CISPR 16-1-1 2010 82
N9038A MXE EMI Receiver 84
20 Hz -1GHz 85
 Swept spectrum analyzer; 86
 FFT analyzer; 86
 Noise Figure analyzer 86
“All Digital IF” Advantages 87
Reduce RBW 88
This is 89
Noise Floor Subtraction 90
Improved noise floor 91
(0.2 - 0.4 dB) error 92
• Limit Lines (2000 pts) 93
• 40001 sweep points 93
 CISPR 16-1-1 detectors 94
Quasi Peak measurements 94
Page 95 95
Amplitude at 96
Amplitude 96
Limit line edit display 97
Meters 98
Meters tune 99
Strip Chart 100
• Spectrogram 101
• Trace Zoom 101
• Zone Span 101
EMC seminar 102
Solution partners for EMC 104
Roberto Sacchi 105

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