Wavetek 3SR 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
9/97Rev.J
Manual Part No.
6510-00-0272
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 3SR
SYSTEM 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
normaloperating conditions and within theservice conditions for whichthey were designed.
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, repairorreplacenonconforming defectivepartsorcomponents
toaconditionaswarrantedwithinareasonabletimeafterreceiptthereof, Buyers shall receive
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,unauthorized modification, misuse, neglect,inadequatemaintenance,
accidentor for any Product which has been repairedor altered byanyone 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,made by an agent,distributor,or employee of Wavetek,whichis not contained inthe
foregoing Warranty will be binding upon Wavetek, unless made in writing and executed by
anauthorized representative of Wavetek.UndernocircumstancesshallWavetek be liablefor
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................................................ 1-2
1.2.4 Carrier to Noise Measurement ............................. 1-3
1.2.5 Frequency Response ............................................. 1-3
1.2.6 Transmitter............................................................. 1-4
1.2.7 Telemetry ............................................................... 1-4
1.2.8 Spectrum Mode...................................................... 1-4
1.2.9 Intermodulation Distortion ................................... 1-5
1.2.10 Depth of Modulation........................................... 1-5
1.2.11 Printer Interface ................................................... 1-6
1.2.12 General.................................................................. 1-6
1.2.13 Powering ............................................................... 1-6
1.2.14 Standard Accessories............................................ 1-6
1.2.15 Options .................................................................. 1-7
1.2.16 Optional Accessories............................................ 1-7
SECTION 2 - INSTALLATION
2.1 INTRODUCTION ......................................................... 2-1
2.2 UNPACKING AND INSPECTION ............................ 2-1
2.3 WARRANTY INFORMATION ................................... 2-1
2.4 POWER REQUIREMENTS ........................................ 2-1
2.5 CABLE SPECIFICATIONS ......................................... 2-2
2.6 TECHNICAL SUPPORT ............................................. 2-4
2.7 Worldwide Sales Offices ..............................................2-4
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 ...............................3-4
3.2.6 Printing ................................................................3-5
SECTION 4 - OPERATION - HOW TO USE THE 3SR
RECEIVER
4.1 INTRODUCTION ......................................................4-1
4.2 STEALTH START-UP PROCEDURE ..................4-1
4.3 SETUP...........................................................................4-3
4.3.1 General Setup......................................................4-4
4.3.2 Measurement Setup............................................4-8
4.3.3 How To Setup Your Channel Plan ...................4-10
4.3.4 How To Edit Channel Parameters ...................4-12
4.3.5 Sweep Receiver...................................................4-19
4.4 HOW TO PERFORM LEVEL MEASUREMENTS
...............................................................................................4-22
4.5 HOW TO MEASURE TILT - BALANCING AN
AMPLIFIER .................................................................4-25
4.6 SCAN MODE ...............................................................4-26
4.7 HOW TO MEASURE C/N .........................................4-30
4.8 HOW TO MEASURE HUM ......................................4-32
4.9 MODULATION ..........................................................4-34
4.10 SPECTRUM ANALYZER MODE ............................ 4-35
4.11 HOW TO PERFORM SWEEP
MEASUREMENTS.............................................................. 4-40
4.11.1 Introduction ....................................................... 4-40
4.11.2 Operation............................................................ 4-40
4.12 FILE................................................................................ 4-43
4.12.1 How to Store/View/Print/Delete Measurement
Files ..................................................................... 4-44
4.12.2 How to Store/Delete Sweep References.......... 4-45
4.12.3 Sweep File Overlay ............................................ 4-46
4.13 AUTO ............................................................................. 4-47
4.13.1 How to Create/Edit/Delete Test Locations .... 4-48
4.13.2 How to Perform an Auto Test ........................... 4-51
4.13.3 Viewing/Printing Auto Test Files ..................... 4-59
4.14 STATUS ......................................................................... 4-66
SECTION 5 - REVERSE SWEEP OPTION
5.1 INTRODUCTION ......................................................... 5-1
5.1.1 Wavetek Stealth Reverse Sweep Concept .......... 5-1
5.1.2 Basic Reverse Sweep Procedure .......................... 5-2
5.1.3 Interfacing With Different Network
Architectures.................................................................... 5-3
5.2 REVERSE SWEEP SETUP ......................................... 5-6
5.2.1Reverse Sweep Insertion Level............................. 5-8
5.2.2 Generating a CW Test Signal...,...........................5.9
5.2.1 Forward Telemetry Frequency (3ST) ................. 5-11
5.2.2 Forward Telemetry Frequency (3HRV) ............. 5-11
5.2.3 Reverse Sweep Operation (3SRV) ....................... 5-11
5.2.4 Select Sweep Direction ......................................... 5-12
5.2.5 Adjust the Reverse Telemetry Level .................. 5-12
5.2.6 Adjust the Reverse Sweep Insertion Level ......... 5-12
5.3 INSTALLATION OF REVERSE SWEEP TRANSMIT-
TER ......................................................................................... 5-13
5.4 FIELD TEST POINT CONSIDERATION .............. 5-15
5.5 INSTALLATION OF 3HRV -- MULTI-USER RE-
VERSE SWEEP TESTING ................................................ 5-15
5.6 REVERSE INGRESS FEATURE................................ 5-17
5.7 REVERSE SWEEP OPERATION............................... 5-18
5.7.1 Sweep Direction Indicator .................................... 5-18
5.7.2 Changing the Sweep Direction ............................ 5-19
5.7.3 Reverse Noise Feature .......................................... 5-19
5.7.4 Telemetry Level Indicator ................................... 5-19
5.7.5 Forward and Reverse Sweep References ............ 5-20
5.7.6 Storing and Viewing Sweep Files......................... 5-20
5.7.7 Recognizing 3SR in Reverse Sweep Option ....... 5-21
5.8 COMMON PATH DISTORTION (CPD)
ANALYSIS.............................................................................. 5-22
APPENDIX A: STATUS INDICATORS .......................... A-1
APPENDIX B: USER MESSAGES .................................... B-1
1-1
SECTION1GENERALINFORMATION
1.1 INTRODUCTION
The Wavetek hand-held System Sweep Receiver 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.
The Sweep System is made up of two components; the 3SR Receiver,
and 3ST Transmitter. The contents of this manual will describe the
care and operation of the 3SR Receiver, including Reverse Sweep
option using the 3HRV Headend Reverse Sweep Receiver.
Frequency response is tested by injecting a low level signal in vacant
spectrum areas, and monitoring cable system carrier levels in occupied
spectrum areas. In addition to generating the sweep test signal, the
3ST Transmitter continuously monitors the system carriers. The 3ST
sends headend level readings to the 3SR Receiver with every sweep
update. In this way, any headend level changes are compensated by
the receiver to maintain the utmost measurement accuracy.
With the Reverse Sweep option, a transmitter is built into the hand-
held sweep receiver. The headend sweep transmitter (3ST) is set up
to receive the reverse sweep sent from the field. When a reverse
sweep is activated from a field test point, the headend transmitter
receives the telemetry signal that indicates which receiver is sending
the sweep. The headend transmitter measures the sweep, and sends
the results, along with the serial number of the sending receiver via its
telemetry signal to the field. The field receiver with the tagged serial
number then displays the sweep response as measured in the headend
on its LCD.
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. In addition, the 3HRV allows up to 10
users to sweep the reverse path simultaneously.
MODEL 3SR
1-2
The 3SR Receiver, in addition to performing its sweep reception
duties, conducts a battery of signal level measurements, including a
full scan of the cable spectrum to 1 GHz. A proprietary digital signal
processing (DSP) technique is used to measure hum and carrier to
noise on modulated carriers.
The 3SR Receiver 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
comprehensive set of information is provided: tuned channel, video
frequency and level, audio frequency and level, the difference
between video and audio carrier levels.
The 3SR Receiver is a streamlined, hand-held instrument, that
weighs less than five pounds. Its 320 X 240 dot matrix LCD shows
measurement data in both graphical and numerical form.
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 -20 to + 50°C (typical),
(relative to 25°C)
1-3
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
*Typical C/N specifications for a noise measurement offset range of
2 to 3 MHz above video carrier
Range: 50 dB maximum
Resolution: 0.5 dB
1.2.5 Frequency Response
Frequency Range: 5 to 1,000 MHz (Forward or Reverse)
+3.0 dB Accuracy
+2.0 dB Accuracy
Out of Measurement Range
*
1-4
Sweep Rate: »1 second for 600 MHz sweep, no
scrambled channels
Accuracy: + 0.5 dB, normalized (dependent on
stability of referenced carriers)
Display Scaling
and Range: 1, 2, 5, and 10 dB/division; 6 vertical
divisions
Sweep Scan: User definable from 5 to 1,000 MHz
Reference Storage: At least 16, including Forward, Reverse, or
Sweepless
Sweep Trace Storage: At least 50, including Forward, Reverse, or
Sweepless
Reverse Option
Transmitter Output: +10 to +40 dBmV, settable in 2 dB
increments
1.2.6 Transmitter
Frequency Range: 5 to 1,000 MHz
Level Range: +20 to +50(1) dBmV; settable in 2 dB
increments
Spectral Purity: Hars -30 dBc; Spurs -35 dBc
1.2.7 Telemetry
Frequency: User defined, 5 to 1,000 MHz
Modulation: FSK, 100 kHz deviation
Spectrum Required: »1 MHz recommended
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