Wavetek 3ST Manuel utilisateur
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. I,
Manual Part No.
6510-00-0273
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 3ST
SYSTEM SWEEP TRANSMITTER
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
toa condition aswarrantedwithin a reasonabletimeafter receipt thereof,Buyersshall 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, inadequate maintenance,
accidentor for any Product which has been repairedor altered by anyone other than Wavetek
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,madebyan agent, 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 representativeof Wavetek.Undernocircumstancesshall Wavetekbe 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 Telemetry .................................................................... 1-3
1.2.6 Transmitter.................................................................. 1-4
1.2.7 Spectrum Mode........................................................... 1-4
1.2.8 Intermodulation Distortion ........................................ 1-4
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 .................................................................... 1-5
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 ................................... 3-4
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 3ST
TRANSMITTER
4.1 INTRODUCTION ............................................................. 4-1
4.2 STEALTH SWEEP START-UP PROCEDURE ......... 4-1
4.3 SETUP.................................................................................. 4-4
4.3.1 General Setup............................................................. 4-5
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 Transmitter ....................................................4-20
4.4 HOW TO PERFORM LEVEL MEASUREMENTS.... 4-22
4.5 HOW TO MEASURE TILT-BALANCING AN
AMPLIFIER ........................................................................4-24
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 ................................................................. 4-33
4.10 SPECTRUM ANALYZER MODE ................................ 4-34
4.11 SWEEP MODE ................................................................. 4-39
4.12 FILE.................................................................................... 4-40
4.12.1 How to Store/View/Delete Measurement Files ...4-40
4.13 AUTO ................................................................................. 4-42
4.13.1 How to Create/Edit/Delete Test Locations ......... 4-42
4.13.2 How to Perform an Auto Test ................................ 4-45
4.13.3 Viewing/Printing Auto Test Files ..........................4-53
4.14 STATUS ............................................................................. 4-59
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 .............................. 5-1
5.1.3 Interfacing With Different Network Architectures 5-2
5.2 HOW TO SETUP FOR REVERSE SWEEPING ......... 5-5
5.2.1 Enable or Disable Reverse Sweep ...........................5-5
5.2.2 Select the Frequency of the Reverse Telemetry
Carrier ......................................................................... 5-6
5.2.3 Access Reverse Sweep Plans .................................... 5-6
5.2.4 Selecting a Reverse Sweep Plan .............................. 5-6
5.2.5 Creating a New Reverse Sweep Plan ...................... 5-7
5.2.6 Editing a Reverse Sweep Plan ................................. 5-10
APPENDIX A: STATUS INDICATORS ............................... A-1
APPENDIX B: USER MESSAGES ......................................... B-1
1-1
SECTION1GENERALINFORMATION
1.1 INTRODUCTION
The Wavetek Sweep System Transmitter 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 Sweep System
Receiver 3SR, and Sweep System Transmitter 3ST. The contents of
this manual will describe the care and operation of the Sweep System
Transmitter 3ST, including Reverse Sweep operation.
Sweep 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
Transmitter 3ST 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.
Sweep response measurements won't be affected by signal levels
changing in the headend. The Transmitter 3ST has all of the mea-
surement capability of the 3SR Receiver, so the Headend Technician
can keep an eye on headend levels.
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.
MODEL 3ST
1-2
The 3ST Transmitter 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 3ST Transmitter is a standard 19" rack mount unit, that weighs
approximately fifteen 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 0 to + 40°C (typical),
(relative to 25°C)
1.2.3 Hum Measurement
(carrier > 0 dBmV) Non-scrambled channels only
Range: 0 to 10%
1-3
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
1.2.5 Telemetry
Frequency: User defined, 5 to 1,000 MHz
Modulation: FSK, 100 kHz deviation
Spectrum Required: »1 MHz recommended
*
+3.0 dB Accuracy
+2.0 dB Accuracy
Out of Measurement Range
1-4
1.2.6 Transmitter
Frequency Range: 5 to 1,000 MHz
Level Range: +20 to +50 dBmV (1) ; 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)
1.2.8 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
*
Out of Measurement Range
+3.0 dB Accuracy
+2.5 dB Accuracy
1-5
*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
Dimensions: Transmitter 3ST: 48.3 cm (W) x
13.3 cm (H) x 35.6 cm (D), 19" (W) x 5.25"
(H) x 14" (D)
Weight: Transmitter 3ST: 6.8 kg (15 lbs.)
Operating
Temperature Range: 0 to +50°C; 32 to 122°F
1.2.12Powering
Frequency 47 to 63 Hz ~ 100 VA
Input Current: 1.2A @ 100 VAC.
0.5A @ 265 VAC.
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