Wavetek 3SR Manuale utente

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

-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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