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Měření, testování a kontrola
147
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ŘEŠENÍ PROBLÉMŮ
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Channel
Plans: Setting Cha
nnel Plan Pa
r
ameters
58
3
1
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SDA Series
1
Stealth Digital Analyzer
1
Operation Manual
1
6510-00-0442, Rev D
2
Important safety instructions
5
Reverse Path Troubleshooting
10
Measuring System Performance
10
Spectrum Analyzer Mode
11
PathTrak Field View (OPT3)
11
Contents
12
Automatic Test
13
Maintenance
14
Application Notes
17
Specifications
19
Status Indicators and Icons
20
User and Error Messages
20
Glossary
20
ABOUT THE MANUAL
21
Section I Introduction
21
Section II Field Units
21
xxii
22
Section III Headend Units
23
Section IV Appendices
23
Document Conventions
23
Keystroke Conventions
24
The SDA Family
25
Field Unit
26
Headend Units
26
FIELD UNIT (SDA-5000)
27
Reverse Sweep Alignment
31
Chapter 2
33
The Navigator Interface
34
Navigator Tabs and Icons
35
Key Controls
37
Measurement Mode Keys
38
40
Level Measurement
41
Spectrum Analysis
45
CONFIGURING THE SDA-5000
46
Global Configuration
47
Channel Plan Configuration
51
Sweep Configuration
52
PathTrak Configuration (OPT3)
52
Diagnostics
53
System Information
56
Channel Plans
59
CHANNEL PLAN CONFIGURATION
60
Select Channel Plan
62
Video Signal Type
63
Channel Tuning Sequence
64
Build Channel Plan
64
Edit Channel Plan
67
Editable Parameters
70
Configuring a Digital Carrier
73
Inverted Spectrum Features
76
Delete Unused Channels
77
Specify Auto Measurements
77
Edit Limits
79
Edit Digital Limits
80
Copy Remote Plan
81
Chapter 4
83
TEST POINT COMPENSATION
83
SWEEP RECEIVER CONFIGURATION
88
Table 4-1 Sweep Options
90
SWEEP Menu Options
91
Signal Level Considerations
95
Sweep Setup
98
Forward Sweep Operation
99
Soft Key Icons:
100
Forward SWEEP Screens
101
Frequency Screen
101
Level Screen
103
Limit Screen
104
Tilt Screen
105
Reverse Sweep
107
Reverse Injection Levels
107
Setting the Sweep Direction
108
Reverse SWEEP Screens
109
Reverse Frequency Screen
110
Reverse Level Screen
110
Reverse Noise Screen
111
Reverse Noise Level Screen
112
REV ALIGNMENT Main Screen
114
REV ALIGNMENT Level Screen
115
SWEEPLESS SWEEP
116
LOOPBACK SWEEP (OPT2)
117
PROBLEMS IN ADVANCED SERVICES
120
Variable Time Slot TDMA
127
Troubleshooting TDMA
128
References
132
Level Measurements
134
MEASURING SIGNAL LEVELS
134
Tilt Measurements
136
Tilt Compensation
137
Balancing Amplifiers
138
Scan Measurements
139
Scan Rates
140
Audio Carriers
140
LEVEL Submenu
141
FREQUENCY Submenu
141
TILT Submenu
142
LIMIT Submenu
142
CARRIER-TO-NOISE MEASUREMENTS
143
Why Measure Cable Modem C/N?
146
HUM MEASUREMENTS
148
MODULATION MEASUREMENTS
150
CSO/CBT MEASUREMENTS
152
AMPLIFIER Submenu
159
ZERO SPAN Submenu
160
TIMEBASE Submenu
162
BANDWIDTH Submenu
163
PATHTRAK MODE OPERATION
166
Node List Mode
169
Node Selection
171
Node Information
171
Measurement Hold
171
Chapter 9
173
INTRODUCTION
173
QUICK START
174
Correcting Signal Lock Errors
175
Equalizer Mode (Quick Start)
177
DIGITAL SUMMARY MODE
177
Features and Definitions
178
Modulation Format
179
Symbol Rate
179
DETAIL Display
179
Basic Operation
180
Viewing the DETAIL Display
181
Viewing the QAM Level Display
181
Editing the Modulation Format
182
Editing the Symbol Rate
183
QAM INGRESS MODE
184
Measuring QAM INGRESS
186
Editing the Reference Level
188
Editing the Scale Parameter
188
Constellation Basics
190
CONSTELLATION MODE
190
Common Impairment Types
191
Using the Zoom Feature
196
EQUALIZER MODE
198
In-Channel Group Delay Screen
201
TEST LOCATIONS
204
Table 10-1 Parameters
205
Entering a New Location
207
Deleting an Existing Location
207
Editing an Existing Location
207
Choose Location
208
PERFORMING AN AUTO TEST
208
Edit Location
209
Select Probe Point
210
Compensation
212
Results File Name
212
Type of Test
213
Temperature
214
Canceling an Auto Test
215
AUTO TEST RESULTS
215
Viewing Intervals
218
Chapter 11
221
STORING FILES
222
VIEWING AND PRINTING FILES
224
SWEEP REFERENCES
225
OVERLAY MODE
227
Files: Overlay Mode
230
Battery Terminal Cleaning
232
Charging the Battery
232
Cleaning the Instrument
233
Annual Calibration
233
Getting Technical Assistance
233
ABOUT OUR SERVICE
234
Customer service locations
235
Instrument services
235
Consulting Services
236
Technical training
237
Warranty information
237
Equipment return instructions
239
Chapter 13
241
USER INTERFACE ELEMENTS
241
Soft Keys
242
Navigator
242
Support Mode Selection Keys
244
Diamond Keys
244
Alphanumeric Entry Keys
244
Printing
245
Global Setup
246
GLOBAL CONFIGURATION
246
Measurements Setup
249
Channel Plan Setup
251
Sweep Transceiver (SDA-5500)
251
Reverse Sweep (SDA-5510)
252
Level Mode
252
BASIC MODES OF OPERATION
252
Tilt Mode
254
Level Adjustments
255
Scan Mode
256
Frequency Adjustments
257
Scan Rate
257
frequency
259
Bandwidth Adjustments
260
Measuring Hum
261
Sweep Mode (SDA-5500)
267
Sweep Mode (SDA-5510)
268
WORKING WITH FILES
271
USING AUTO TEST
272
How To Perform An Auto Test
276
Auto Test Location
277
Auto Test Characteristics
277
Test Point Type
278
Voltage Measurements
279
Test Point Compensation
280
Results File
281
Type Of Test
281
Immediate
281
Scheduled
282
SDA-5500/SDA-5510 Sweep
291
Configuration
291
Setting Levels
293
Forward Telemetry Level
296
Forward Sweep Insertion Level
296
Include Audio Carriers
297
Access Reverse Sweep Plans
297
Creating Channel Plans
298
First Channel Plan Procedure
299
Editing A Channel Plan
301
Testing the Transmitter Setup
307
Stealth Reverse Sweep Concept
308
CONFIGURING REVERSE SWEEP
308
Basic Reverse Sweep Procedure
309
Wiring Connections
309
Dual Cable Network
311
Reverse Sweep Setup
312
(SDA-5500 and SDA-5510)
313
Reverse Sweep Channel Plans
314
Editing a Reverse Sweep Plan
318
SDA-5500
320
USING BOTH HEADEND UNITS
321
Forward Sweep Theory
322
SWEEP HISTORY AND THEORY
322
Telemetry Channel
323
Reverse Sweep Theory
324
Productivity Tools
325
Sweep References
326
Optical Node
326
Reverse Amplifier Alignment
327
Reverse Noise Broadcast
328
File Overlay
329
3. Edit Channel Parameters
333
Copying Channel Plans
334
Field Unit Settings
335
Common Forward Sweep Problems
337
No Communication
338
Bad Response
338
Faster Forward Sweep
338
Other Applications
339
Tips & Hints
340
Step-by-Step Headend Set Up
342
REVERSE SWEEP AND BALANCE
342
Before You Leave the Headend
345
Another Way
347
Common Return Sweep Problems
348
History of CPD
353
RETURN PATH TROUBLESHOOTING
353
Troubleshooting CPD
354
Test Location Considerations
354
The Noise Mode
355
Section 76.605(a)
359
PROOFING AND TESTING
359
Ena Tilt Swp Scr
361
Hum [76.605(a)(10)]
364
Headend Tests [76.605(a)(11)]
365
Carrier-to-Noise
368
Hum Measurement
368
Depth of Modulation
368
Tilt Measurement
368
Sweep Mode
369
Spectrum Mode
369
Zero-Span Mode
370
Reverse Transmitter
370
Telemetry
370
Data Storage
371
Serial Interface
371
Input Configuration
371
Power Sources
371
Forward Transmitter (OPT 2)
372
QAM View Option (Option 4)
372
MER (Modulation Error Ratio):
373
EVM (Error Vector Magnitude):
374
BER (Bit Error Rate):
374
Measurable QAM Ingress:
374
Channel Bandwidth:
374
Power Source:
375
Soft Key Icons
378
SDA Option 3 -- PathTrak
381
SDA Option 4 -- QAM
382
Symbols and Numbers
395
frequency adjustments
403
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