Wavetek 3HRV Manual de usuario
WavetekWavetek
WavetekWavetek
Wavetek
CATV Division
5808 Churchman Bypass
Indianapolis, IN 46203-6109
(800)851-1198
(317)788-5960
Fax: (317)782-4607
E-Mail: [email protected]
Internet: http://www.wavetek.com
11/96 Rev. A
Manual Part No.
6510-00-0300
This document contains information proprietary to
Wavetek. The information in this document
is not to be used or duplicated in any manner without
the prior approval, in writing, of Wavetek.
OPERATION MANUAL
MODEL 3HRV
HEADEND REVERSE
SWEEP RECEIVER
WARRANTY
Wavetek warrants that all Products manufactured or procured by Wavetek conform to
Wavetek’s published specifications and are free from defects in materials and workmanship
for a period of one (1) year from the date of delivery to the original Buyer, when used under
normaloperatingconditionsand withintheserviceconditionsforwhichtheyweredesigned.
This warranty is not transferrable and does not apply to used or demonstration products.
The obligation of Wavetek arising from a Warranty claim shall be limited to repairing, or at
its option, replacing without charge, any assembly or component (except batteries) which in
Wavetek’s sole opinion proves to be defective within the scope of the Warranty. In the event
Wavetekisnotabletomodify,repairorreplacenonconformingdefectivepartsorcomponents
toacondition aswarrantedwithina reasonabletimeafterreceipt thereof,Buyersshallreceive
credit in the amount of the original invoiced price of the product.
Wavetek must be notified in writing of the defect or nonconformity within the Warranty
period and the affected Product returned to Wavetek’s factory, designated Service Provider,
or Authorized Service Center within thirty (30) days after discovery of such defect or
nonconformity. Buyer shall prepay shipping charges and insurance for Products returned to
Wavetek or its designated Service Provider for warranty service. Wavetek or its designated
Service Provider shall pay costs for return of Products to Buyer.
Wavetek shall have no responsibility for any defect or damage caused by improper storage,
improperinstallation,unauthorizedmodification,misuse, neglect, inadequate maintenance,
accidentor for any Product which has beenrepaired or altered by anyone other thanWavetek
or its authorized representative or not in accordance with instructions furnished by Wavetek.
The Warranty described above is Buyer’s sole and exclusive remedy and no other warranty,
whether written or oral, expressed or implied by statute or course of dealing shall apply.
Wavetek specifically disclaims the implied warranties of merchantability and fitness for a
particular purpose. No statement, representation, agreement, or understanding, oral or
written,madebyanagent,distributor,or employee of Wavetek, which is not contained in the
foregoing Warranty will be binding upon Wavetek, unless made in writing and executed by
anauthorized representativeofWavetek.Undernocircumstancesshall Wavetekbeliablefor
any direct, indirect, special, incidental, or consequential damages, expenses, or losses,
including loss of profits, based on contract, tort, or any other legal theory.
Extended Warranty Programs
Extended warranties and service contracts are available for new and currently owned
equipment for an additional cost. Contact the Customer Service Department (800 851-
1198) for details pertaining to extended warranties and service contracts.
Return Authorization Procedure
The customer MUST obtain a RETURN AUTHORIZATION NUMBER from the
Customer Service Department (800 851-1198) prior to returning any equipment for
warranty or non-warranty repair. Wavetek accepts no liability for any instrument or
subassembly returned to the factory without this number. Any correspondence regarding
returned instruments or subassemblies should be referenced to that number.
Contents
SECTION 1 - GENERAL INFORMATION
1.1 INTRODUCTION ................................................................ 1-1
1.2 SPECIFICATIONS ............................................................. 1-2
1.2.1 Frequency .................................................................... 1-2
1.2.2 Level Measurement ................................................... 1-2
1.2.3 Hum Measurement..................................................... 1-3
1.2.4 Carrier to Noise Measurement .................................. 1-3
1.2.5 Telemetry .................................................................... 1-4
1.2.6 Transmitter.................................................................. 1-4
1.2.7 Spectrum Mode........................................................... 1-4
1.2.8 Intermodulation Distortion ........................................ 1-5
1.2.9 Depth of Modulation .................................................. 1-5
1.2.10 Serial Interface .......................................................... 1-5
1.2.11 General....................................................................... 1-5
1.2.12 Powering .................................................................... 1-6
1.2.13 Standard Accessories................................................. 1-6
1.2.14 Options....................................................................... 1-6
1.2.15 Optional Accessories................................................. 1-6
SECTION 2 - INSTALLATION
2.1 INTRODUCTION ............................................................... 2-1
2.2 UNPACKING AND INSPECTION ................................... 2-1
2.3 INSTALLATION .................................................................. 2-1
2.4 WARRANTY INFORMATION .......................................... 2-2
2.5 POWER REQUIREMENTS ............................................... 2-3
2.6 CABLE SPECIFICATIONS ................................................ 2-3
2.7 TECHNICAL SUPPORT .................................................... 2-5
2.8 WORLDWIDE SALES OFFICES .....................................2-5
SECTION 3 - USER INTERFACE
3.1 INTRODUCTION .............................................................. 3-1
3.2 FRONT-PANEL DESCRIPTION ................................... 3-1
3.2.1 Soft Keys ...................................................................... 3-1
3.2.2 Measurement Mode Selection Keys ......................... 3-2
3.2.3 Support Mode Selection Keys ................................... 3-3
3.2.4 Arrow Keys .................................................................. 3-4
3.2.5 Alpha-Numeric Entry Keys ....................................... 3-5
3.2.6 Printing ........................................................................ 3-6
SECTION 4 - OPERATION - HOW TO USE THE 3HRV
HEADEND REVERSE SWEEP RECEIVER
4.1 INTRODUCTION .............................................................4-1
4.1.1 Wavetek Stealth Reverse Sweep Concept .............. 4-1
4.1.2 Basic Reverse Sweep Procedure .............................. 4-1
4.1.3 Interfacing With Different Network Architectures 4-2
4.2 HOW TO SETUP YOUR 3HRV ..................................... 4-5
4.2.1 How to Setup for Reverse Sweeping .......................4-5
4.2.2 How to Setup for Measurement Modes .................. 4-12
4.3 SETUP.................................................................................. 4-13
4.3.1 General Setup.............................................................4-14
4.3.2 Measurement Setup................................................... 4-18
4.3.3 How To Setup Your Channel Plan .......................... 4-19
4.3.4 How To Edit Channel Parameters .......................... 4-22
4.3.5 Reverse Sweep ........................................................... 4-28
4.3.6 Editing a Reverse Sweep Plan ................................. 4-34
4.4 HOW TO PERFORM LEVEL MEASUREMENTS.... 4-35
4.5 HOW TO MEASURE TILT-BALANCING AN
AMPLIFIER ........................................................................4-37
4.6 SCAN MODE ......................................................................4-39
4.7 HOW TO MEASURE C/N ................................................ 4-43
4.8 HOW TO MEASURE HUM ............................................. 4-45
4.9 MODULATION ................................................................. 4-46
4.10 SPECTRUM ANALYZER MODE ................................ 4-47
4.11 SWEEP MODE ................................................................. 4-52
4.12 FILE.................................................................................... 4-54
4.12.1 How to Store/View/Delete Measurement Files ... 4-54
4.13 AUTO ................................................................................. 4-55
4.13.1 How to Create/Edit/Delete Test Locations ......... 4-55
4.13.2 How to Perform an Auto Test ................................ 4-59
4.13.3 Viewing/Printing Auto Test Files .......................... 4-67
4.14 STATUS ............................................................................. 4-73
APPENDIX A: STATUS INDICATORS ............................... A-1
APPENDIX B: USER MESSAGES ......................................... B-1
1-1
SECTION1GENERALINFORMATION
1.1 INTRODUCTION
The 3HRV Reverse Sweep Receiver is a headend rack mounted unit
that handles the reverse sweep job for up to 10 different technicians
on the same cluster of nodes.
The addition of the 3HRV to the Wavetek Sweep System takes the
responsibility of the reverse sweep away from the 3ST. This serves to
speed up the reverse sweep rate. In addition, the 3HRV sends out
reverse ingress/noise information with every update of its forward
telemetry, so reverse telemetry need not be received in order to check
the reverse ingress condition.
Reverse Sweep Alignment
Reverse sweep alignment provides an optimum view of the frequency
response in unoccupied reverse spectrum, leaving nothing to the
imagination. A reverse sweep can uncover mismatch problems which
reveal themselves as standing waves, or diplex filter roll-offs that can
severely hamper the carriage of services in the reverse band.
Ingress Detection and Troubleshooting
The 3HRV provides feedback to the field as to the current condition
of noise and ingress in the headend. Even if the noise or ingress is
"swamping" the telemetry a "picture" of the headend noise/ingress is
sent out to the receiver via a special forward telemetry carrier for
display.
Easy To Read Noise/Ingress Display
The headend instrument provides a continuous display of the noise/
ingress performance of the connected nodes. This provides a quick,
easy way for the headend technician to verify performance. In addi-
tion, the current reverse testing activity can be monitored.
The 3HRV also performs essential cable TV system preventive
maintenance tests with accuracy and ease. Signal levels, hum, C/N,
and frequency response can be quickly tested without subscriber
interference.
MODEL 3HRV
1-2
The 3HRV is a full-featured signal analysis meter, with a complete
spectrum display and an analog representation of single channel
measurement data. When tuned to a specific channel, a comprehen-
sive set of information is provided: tuned channel, video frequency
and level, audio frequency and level, the difference between video
and audio carrier levels.
The 3HRV is a standard 19" rack mount unit, that weighs approxi-
mately fifteen pounds. Its 320 X 240 dot matrix LCD shows measure-
ment data in both graphical and numerical form.
The contents of this manual will describe the care and operation of
the Headend Reverse Sweep Receiver, including Reverse Sweep
operation.
1.2 SPECIFICATIONS
1.2.1 Frequency
Range: 5 to 1,000 MHz
Accuracy: + 10 ppm at 25°C; + 10 ppm drift over
temp.; + 3 ppm/year aging
Resolution Bandwidths: 30, 280 kHz (30 kHz for CSO)/CTB only)
Tuning Resolution: 10 kHz
Sweep Resolution: 250 kHz maximum
1.2.2 Level Measurement
Range: -40 to +60 dBmV
Resolution: 0.1 dB
Accuracy: + 1.0 dB from 0 to + 40°C (typical),
(relative to 25°C)
1-3
Digital Average Power
Option Accuracy: +1.8 dB at 25°C
1.2.3 Hum Measurement
(carrier > 0 dBmV) Non-scrambled channels only
Range: 0 to 10%
Resolution: <0.2%
Accuracy: +0.7%
1.2.4 Carrier to Noise Measurement
Non-scrambled channels only. No preselection required for 78
channels at +10 dBmV input level.
Carrier to Noise Ratio
Depth of Measurement Characteristics
Video Carrier Level (dBmV)
Carrier to Noise Range
0
10
20
30
40
50
60
-10 0 10 14 24
*Specified results with the measurement offset within 2 to 3 MHz
range above the video carrier.”
Resolution: 0.5 dB
Range 52 dB maximum
*
+3.0 dB Accuracy
+2.0 dB Accuracy
Out of Measurement Range
1-4
1.2.5 Telemetry
Frequency: User defined, 5 to 1,000 MHz
Modulation: FSK, 100 kHz deviation
Spectrum Required: »1 MHz recommended
1.2.6 Transmitter
Frequency Range: 5 to 1,000 MHz
Level Range: +20 to +50 dBmV; settable in 2 dB
increments
Spectral Purity: Hars -30 dBc; Spurs -35 dBc
1.2.7 Spectrum Mode
Spans: 3, 5, 10, 20, and 50 MHz (0.3, 0.5, 1, 2, and
5 MHz/div)
Sweep Rates: 2 seconds (50 & 5 MHz)
Display Scaling
and Range: 0.5, 1, 2, 5, and 10 dB/division; 6 vertical
divisions
Spurious Free
Dynamic Range: 60 dB (typical specifications)
1-5
1.2.8 Intermodulation Distortion
CSO / CTB Characteristics
Video Signal Level (dBmV)
Depth of Measurement (dB)
(without preamplification / with
preselection)
0
10
20
30
40
50
60
-20 -10 0 10 20 30
*Typical Specifications
Range: 60 dB maximum
Resolution: 1 dB
1.2.9 Depth of Modulation
Assumes presence of white reference on any VITS line. Non-
scrambled channels only.
Range: 80 to 100%
Resolution: <0.5% at 85%
1.2.10 Serial Interface
Serial, RS232; Epson, IBM Printers
1.2.11General
Log Linearity: +0.5 dB (typical)
Flatness: +0.5 dB @ 25 °C, @ 20 dBmV
*
Out of Measurement Range
+3.0 dB Accuracy
+2.5 dB Accuracy
Tabla de contenidos
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