Exfo PSO-100 Series Optical Sampling Oscilloscopes Manual do Utilizador descarregar pdf (Página 124)

Measurement Definitions

116 PSO-100

Duty Cycle Distortion

The duty cycle distortion (DCD) is a measurement of the time separation of

the rising and falling edge of the eye at the center (50 %) level. The DCD is

defined in percentage of the bit period as:

In a "perfect" eye with no timing- and amplitude jitter, and a 50 % crossing,

the DCD is zero.

DCD 100%

rise,center

fall,center

–

bit period

------------------------------------------------------

50 %

Bit period

DCD time

1 2 ... 119 120 121 122 123 124 125 126 127 128 129 ... 139 140

User Guide 1
Contents 3
Certification Information 6
DECLARATION OF CONFORMITY 7
1 Introducing the PSO-100 9
IMPORTANT 10
Basic Theory 11
Typical Applications 12
2 Safety Information 15
Electrical Safety Information 16
10 PSO-100 18
Equipment Ratings 18
³ Operation 18
³ Storage 18
3 Getting Started with Your 19
Optical Sampling Oscilloscope 19
12 PSO-100 20
14 PSO-100 22
16 PSO-100 24
22 PSO-100 30
26 PSO-100 34
4 Setting up and Using the 37
Managing SoftSync Input 41
36 PSO-100 44
Using the Zoom Functions 45
Selecting Sync Format 46
40 PSO-100 48
Using the Dual Window View 50
Using the Clock Input 52
46 PSO-100 54
48 PSO-100 56
Changing the Persistence Time 57
Changing the Averaging Value 58
Displaying Histograms 60
54 PSO-100 62
Managing Filters 63
56 PSO-100 64
order Butterworth filter 65
Using Colorgrade 66
Using Markers 67
60 PSO-100 68
Using the Eyeline Mode 69
62 PSO-100 70
Using Masks 71
64 PSO-100 72
66 PSO-100 74
Measurements 76
To select a measurement type: 78
72 PSO-100 80
Eye Mode Measurement Example 81
Pattern Measurement Example 82
Managing Synchronization 83
76 PSO-100 84
Filter-Based Phase Tracking 85
78 PSO-100 86
Saving Sample Files 87
80 PSO-100 88
5 Maintenance 89
Replacing Fuses 92
Recycling and Disposal 93
6 Troubleshooting 95
Solving Common Problems 101
94 PSO-100 102
PSO-10XX-XX-XX-XX-XX 103
Transportation 104
7 Warranty 105
Liability 106
Service and Repairs 108
A Technical Specifications 111
B Burst Mode Measurements 113
106 PSO-100 114
C Measurement Definitions 117
One Level 118
Zero Level 118
Signal-to-Noise Ratio 119
Crossing 119
Timing Jitter 120
Rise Time and Fall Time 121
Extinction Ratio 121
Eye Height 122
Eye Amplitude 122
Eye Opening Factor 122
Eye Width 123
Duty Cycle Distortion 124
Pulse Width 125
Contrast Ratio 125
Duty Cycle 126
D Asynchronous Sampling 127
Principle 127
Frequency Holes 128
122 PSO-100 130
Pattern Effects 131
.................. 32 134
₼⦌␂ℝ☀⹂䓸德棟Ⓟ䤓屓⸩ 138
MARKING REQUIREMENTS 139

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