Tektronix 1760 Schematic
Service Manual
1740A Series, 1750A Series, & 1760 Series
Waveform/Vector Monitors
S/N B020000 and Above
070-8469-03
This document applies to firmware version 2.00
and above.
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.
www.tektronix.com
Copyright © Tektronix, Inc. All rights reserved.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
WARRANTY
Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and
workmanship for a period of three (3) years from the date of shipment. If a product proves defective during this
warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor,
or will provide a replacement in exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration
of the warranty period and make suitable a rrangements for the performance of service. Customer shall be
responsible for packaging and shipping the defective product to the service center designated by Tektronix, with
shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a
location within the country in which the Tektronix service center is located. Customer shall be responsible for
paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or ina dequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warra nty a) to repair damage
resulting from attempts by personnel other than Tektronix representatives to install, repair or servic e the product;
b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any
damage or malfunction caused by the use of non-Tektronix supplies; or d) to service a product that has been
modified or integrated with other products when the effect of such modification or inte g ration increases the time
or difficulty of servicing the product.
THIS W ARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS
OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’
RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS W ARRANTY.
TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR
THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
Table of Contents
Specifications
General Safety Summary ix...................................
Service Safety Summary xi....................................
Preface xiii...................................................
Contacting Tektronix xiv.............................................
Product Description 1--1..............................................
Input Format 1--13....................................................
Installation 2--1.....................................................
Standard Accessories 2--1.............................................
Mechanical Installation 2--2...........................................
Electrical Installation 2--8.............................................
Rear Panel Connectors 2--9............................................
Remote Connector 2--10...............................................
Remote Connector Converter 2--12.......................................
RS232 Connector 2--13................................................
Installing Software 2--14...............................................
Loading Software 2--16................................................
Calibrating New Features 2--20..........................................
Special Recovery for Power Loss During the Execution of UPGRADE 2--20.....
Operating Information
Theory of Operation
Getting Started 2--23..................................................
Operating Instructions 2--24............................................
General Menu Information 2--25.........................................
Functional Overview 2--27.............................................
Displaying a Signal 2--29...............................................
Block Diagram Description 3--1..................................
Block Diagram 1: Input and Waveform Monitor 3--1........................
Block Diagram 2: Vector -- SCH -- Component 3--3.........................
Block Diagram 3: Microprocessor and Line Rate Controller 3--5..............
Circuit Theory 3--7............................................
Diagrams <1> and <2> Channel A and Channel B Inputs 3--7...............
Diagram <3> Vertical Input 3--8........................................
Diagram <4> Vertical Output 3--10.......................................
Diagram <5> Horizontal 3--11..........................................
Diagram <6> Microprocessor 3--12......................................
Diagram <7> Dynamic Control 3--14.....................................
Diagram <8> Readout 3--15............................................
Diagram <9> DACS & Serial 3--16......................................
Diagram <10> Remote & 1760 Series / XROM Bus Connectors 3--16...........
1740A Series, 1750A Series, & 1760 Series Service Manual
i
Table of Contents
Diagram <11> Z-Axis & Control 3--17....................................
Diagram <12> Front Panel 3--18.........................................
Diagram <13> DACs & Digital Control 3--18..............................
Diagram <14> Subcarrier Regenerator 3--19...............................
Diagram <15> Phase Shifter 3--21.......................................
Diagram <16> Demodulator 3--22.......................................
Diagram <17> Internal SCH 3--23.......................................
Diagram <18> Reference SCH 3--26.....................................
Diagram <19> Component Inputs, Transcoders, & RGB Outputs 3--28..........
Diagram <20> Component Control and Switching (1760 Series Only) 3--30......
Diagram <21> Low Voltage Power Supply 3--32............................
Diagram <22> High Volts Power Supply 3--35..............................
Performance Verification
Recommended Equipment List 4--1.....................................
Performance Check Procedure Short-Form Reference 4--6...................
Performance Check Procedure 4--19......................................
Adjustments
Maintenance
Required Equipment 5--1..............................................
Initial Setup 5--9....................................................
Functional Description of PC Display 5--10................................
Circuit Board Adjustment Locations 5--12.................................
Waveform Illustrations 5--15............................................
Preventing ESD 6--1.................................................
Preventive Maintenance 6--1...........................................
Performance Checks and Adjustments 6--2................................
Inspection and Cleaning 6--2...........................................
Replacing the Line Fuse 6--5...........................................
Troubleshooting 6--5.................................................
Corrective Maintenance 6--12....................................
Circuit Boards 6--12...................................................
Mechanical Disassembly/Assembly 6--13..................................
Removing the Bezel 6--13..........................................
Replacing the Graticule Light 6--14...................................
Removing the CRT 6--16...........................................
Removing the Rear Panel 6--19......................................
Removing the Front Panel and the Front Panel Circuit Board 6--21..........
Removing the Main Board 6--22.....................................
Removing the Power Supply Board 6--24..............................
Removing the Vector Board 6--25....................................
Removing the SCH Board
(1750A Series & 1760 Series Option SC only) 6--26..............
Removing the Component Board
(1760 Series only) 6--26.....................................
Repackaging 6--27....................................................
ii
1740A Series, 1750A Series, & 1760 Series Service Manual
Options and Accessories
Options 7--1........................................................
Standard Accessories 7--1.............................................
Optional Accessories 7--2.............................................
Replaceable Electrical Parts
Parts Ordering Information 8--1.........................................
Using the Replaceable Electrical Parts List 8--1............................
Diagrams/Circuit Board Illustrations
Replaceable Mechanical Parts
Parts Ordering Information 10--1.........................................
Using the Replaceable Mechanical Parts List 10--1..........................
Table of Contents
Glossary
Index
1740A Series, 1750A Series, & 1760 Series Service Manual
iii
Table of Contents
List of Figures
Figure 2--1: Dimensions of the 1700F00 plain cabinet 2--2............
Figure 2--2: 1700F02 portable cabinet 2--3.........................
Figure 2--3: Rear view showing the securing screws 2--4.............
Figure 2-- 4: The WFM7F05 side-by-side rack adapter 2-- 5...........
Figure 2--5: A WFM7F05 with a blank front panel (1700F06) 2--5.....
Figure 2--6: WFM7F05 rack mount cabinet with a 1700F07 utility
drawer 2-- 6...............................................
Figure 2--7: Custom installation of an instrument 2--7...............
Figure 2--8: Rear panel connectors 2--9............................
Figure 2--9: Rear panel REMOTE connector. 2--10...................
Figure 2--10: Replacement adapter for 1740/1750 2--12...............
Figure 2--11: Rear panel RS232 connector 2--13.....................
Figure 2-- 12: Standard and alternate hookups for the 9-pin
connector 2--16.............................................
Figure 2-- 13: Standard and alternate hookups for 25-Pin PC
Connector 2--17.............................................
Figure 2--14: 1760 front panel 2--24................................
Figure 2--15: The CRT menu, with the bezel controls and buttons 2--25.
Figure 3--1: NTSC line count (U24) & color frame 1 SCH field pulse 3--26
Figure 3--2: PAL line count (U24) & color frame 1 SCH field pulse 3--27
Figure 3--3: Pinout of the CRT socket 3--35.........................
Figure 4--1: External Horizontal or RGB/YRGB Cable Adapter 4--4...
Figure 4--2: Remote Sync Cable Adapter 4--5......................
Figure 4-- 3: Audio and Timecode Cable Adapter 4-- 5................
Figure 4--4: Timing Cursor Check 4--16............................
Figure 4--5: Fast DC Restorer Response 4--24.......................
Figure 4--6: R--Y Display 4--27....................................
Figure 4-- 7: Audio Display 4-- 33..................................
Figure 4-- 8: Option Blanking Pulse 4-- 36...........................
Figure 4--9: Bowtie Common Mode Rejection Ratio 4--38.............
Figure 5--1: External horizontal/RGB and YRGB cable adapter 5--5...
Figure 5--2: Remote sync cable adapter 5--5........................
Figure 5-- 3: Audio and Timecode Cable Adapter 5-- 6................
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1740A Series, 1750A Series, & 1760 Series Service Manual
Table of Contents
Figure 5--4: RS232 cable standard and alternate connections for
9-pin PC connector 5--7.....................................
Figure 5-- 5: RS232 cable standard and alternate hookups for
25-pin PC connector 5--8....................................
Figure 5--6: Typical adjustment procedures PC screen display 5--10....
Figure 5-- 7: A1 Power Supply board 5-- 12..........................
Figure 5--8: A3 Main board 5--12..................................
Figure 5--9: A5 Vector board 5--13.................................
Figure 5--10: A6 SCH board 5--13.................................
Figure 5--11: A7 Component board 5--14...........................
Figure 5--12: Adjusting for thinnest luminance step 5--15.............
Figure 5--13: Matching flat and luminance filter responses 5--15.......
Figure 5--14: Adjusting the NTSC SCH on the oscilloscope 5--16.......
Figure 5-- 15: Matching the SCH dot flipping points 5--16.............
Figure 5-- 16: Adjusting the option blanking pulse 5-- 17...............
Figure 5--17: Adjusting for minimum Bowtie amplitude 5--17..........
Figure 5-- 18: Adjusting Diamond display phase 5--18.................
Figure 6-- 1: Instrument etched circuit board assemblies 6--12..........
Figure 6--2: Removing the CRT bezel 6--13.........................
Figure 6-- 3: Replacing graticule light bulbs 6-- 15....................
Figure 6--4: Removing the CRT 6--17..............................
Figure 6-- 5: Removing the rear panel and Input/BNC assembly 6-- 20...
Figure 6-- 6: Disassembling Input/BNC assembly A4/A4--A1 6-- 20.......
Figure 6-- 7: Removing the front--panel assembly 6-- 21................
Figure 6--8: Front Panel circuit board assembly 6--22.................
Figure 6--9: Screws holding the Main circuit board in place 6--23.......
Figure 6-- 10: Securing screws for the Power Supply circuit 6--24.......
Figure 6--11: Mounting h ardware for the Vector and SCH circuit
boards 6-- 25................................................
Figure 6--12: Component circuit board mounting hardware 6--26......
Figure 6--13: Repackaging a 1740A, 1750A, or 1760 Series
instrument 6--27............................................
Figure 10--1: Exploded View 10--11.................................
1740A Series, 1750A Series, & 1760 Series Service Manual
v
Table of Contents
List of Tables
Table 1--1: Waveform vertical deflection 1--3......................
Table 1--2: External reference 1--6..............................
T able 1--3: Waveform horizontal deflection 1--6...................
T able 1--4: Measurement cursors 1--7............................
Table 1--5: RGB/YRGB 1--7....................................
T a b l e 1 -- 6 : C a l i b r a t o r 1 -- 8.....................................
Table 1--7: Vector mode 1--8....................................
Table 1--8: Audio mode 1--9.....................................
Table 1--9: Time code 1--10......................................
Table 1--10: SCH Phase mode (1750 Series and
1760 Option SC Only) 1--10..................................
Table 1--11: Component vector mode (1760 Series Only) 1--12.........
Table 1--12: Lightning mode (1760 Series only) 1--12.................
Table 1--13: Bowtie mode (1760 Series only) 1--13...................
Table 1--14: Transcoded GBR outputs 1--13........................
Table 1--15: CRT display 1--14...................................
Table 1--16: Power source 1--14...................................
T able 1--17: Environmental characteristics 1--14....................
Table 1--18: Physical characteristics 1--15..........................
Table 1--19: Certifications and compliances 1--16....................
T able 2--1: Remote connector 2--1 1................................
Table 2--2: The available display modes 2--27.......................
Table 3--1: Transcoder signal mixing 3--28.........................
Table 3--2: Component display output switching 3--29...............
Table 4--1: Short-Form Performance Check 4--6....................
Table 4--2: Vector cursor readout values 4--17......................
Table 4--3: Audio and Timecode Values 4-- 32.......................
T able 6--1: External inspection check list 6--3......................
Table 6--2: Power supply fault symptoms 6-- 6......................
Table 6--3: Low volts supply voltages 6--6.........................
Table 6--4: Control Circuit Test Points 6--8........................
Table 6--5: Shut down logic levels 6-- 9............................
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1740A Series, 1750A Series, & 1760 Series Service Manual
Table of Contents
Table 6--6: High Volts Supply Fault Symptoms 6--10.................
Table 6--7: High voltage oscillator test points 6--11..................
Table 6--8: Main Board Plug Connections 6--22.....................
Table 7--1: Power cord identification 7--2.........................
1740A Series, 1750A Series, & 1760 Series Service Manual
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Table of Contents
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1740A Series, 1750A Series, & 1760 Series Service Manual
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use this
product only as specified.
Only qualified personnel should perform service procedures.
ToAvoidFireor
Personal Injury
Use Proper Power Cord. Use only the power cord specified for this product and
certified for the country of use.
Ground the Product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Use Proper Fuse. Use only the fuse type and rating specified for this product.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
Symbols and Terms
1740A Series, 1750A Series, & 1760 Series Service Manual
Terms in this Manual. These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
ix
General Safety Summary
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
Terms on the Product. These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
Symbols on the Product. The following symbols may appear on the product:
CAUTION
Refer to Manual
WARNING
High Voltage
Protective Ground
(Earth) Terminal
x
1740A Series, 1750A Series, & 1760 Series Service Manual
Service Safety Summary
Only qualified personnel should perform service procedures. Read this Service
Safety Summary and the General Safety Summary before performing any service
procedures.
Do Not Service Alone. Do not perform internal service or adjustments of this
product unless another person capable of rendering first aid and resuscitation is
present.
Disconnect Power. To avoid electric shock, switch off the instrument power, then
disconnect the power cord from the mains power.
Use Caution When Servicing the CRT. To avoid electric shock or injury, use
extreme caution when handling the CRT. Only qualified personnel familiar with
CRT servicing procedures and precautions should remove or install the CRT.
CRTs retain hazardous voltages for long periods of time after power is turned off.
Before attempting any servicing, discharge the CRT by shorting the anode to
chassis ground. When discharging the CRT, connect the discharge path to ground
and then the anode. Rough handling may cause the CRT to implode. Do not nick
or scratch the glass or subject it to undue pressure when removing or installing it.
When handling the CRT, wear safety goggles and heavy gloves for protection.
Use Care When Servicing With Power On. Dangerous voltages or currents may
exist in this product. Disconnect power, remove battery (if applicable), and
disconnect test leads before removing protective panels, soldering, or replacing
components.
To avoid electric shock, do not touch exposed connections.
X-Radiation. To avoid x-radiation exposure, do not modify or otherwise alter the
high-voltage circuitry or the CRT enclosure. X-ray emissions generated within
this product have been sufficiently shielded.
1740A Series, 1750A Series, & 1760 Series Service Manual
xi
Service Safety Summary
xii
1740A Series, 1750A Series, & 1760 Series Service Manual
Preface
Servicing Information
This manual provides servicing information for the 1740A/1750A/1760--Series
of instruments. The 1750A is identical to the 1740A, except that the 1750A--Series makes SCH Phase measurements. The 1760-Series adds component analog
measurement capability to the basic 1740A-Series, and the 1760-Series Option
SC adds the same component analog measurement capability to a 1750A-Series
instrument.
This manual supports both module level (for module exchange) and component
level servicing. Module level servicing uses the block diagram and its descriptions to isolate a problem to the circuits on a particular circuit board. Component
level servicing also uses the theory of operation, schematic diagrams and circuit
board parts locating illustration and cross reference indexes (part location charts).
Specific procedures for troubleshooting and disassembly in this manual should
only be attempted by competent service technicians. Be sure to read and follow
all Warnings and Cautions when performing maintenance.
The last sections of this manual contain the Replaceable Parts Lists, Circuit
Board Illustrations, and Schematic Diagrams needed to isolate and replace faulty
components. Replacement part ordering information can be found in the
Maintenance section of this manual.
Performance Verification
These instruments are designed to be returned to operation within stated
specifications through a PC-based adjustment procedure. The disk holder for this
manual contains two computer disks: 1. A software disk containing instruments
operating software (Version 2.2 or greater). 2. A calibration software disk.
An IBM compatible personal computer (PC) with a DOS 3.3 or higher operating
system, and a 3
readjustment procedure or reload the operating software.
The spare software disk is provided in case the Main circuit board, which
contains the software, requires replacement. In all cases, the operating software
must be Version 2.2 or above to perform the Readjustment Procedure.
The specifications contained in the Specification section of this manual contain
Performance Verification step numbers.
1
/2inch high density floppy drive is required to perform the
1740A Series, 1750A Series, & 1760 Series Service Manual
xiii
Preface
Contacting Tektronix
Phone 1-800-833-9200*
Address Tektronix, Inc.
Department or name (if known)
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
Web site www.tektronix.com
Sales support 1-800-833-9200, select option 1*
Service support 1-800-833-9200, select option 2*
Technical support Email: techsupport@tektronix.com
1-800-833-9200, select option 3*
6:00 a.m. -- 5:00 p.m. Pacific time
* This phone number is toll free in North America. After office hours, please leave a
voice mail message.
Outside North America, contact a Tektronix sales office or distributor; see the
Tektronix web site for a list of offices.
xiv
1740A Series, 1750A Series, & 1760 Series Service Manual
Specifications
The tables in this chapter list the specifications for the 1740A, 1750A, and 1760
Series waveform monitors. Items listed in the Performance Requirement column
are generally quantitative, and can be tested by the Performance Verification
procedure in the service manual. Items listed in the Reference Information
column are useful operating parameters that have typical values; information in
this column is not guaranteed.
The second column of the two column format contains all of the descriptive
material about the listed characteristic. The performance verification procedure
step number, used to verify the characteristic, is also in this column. This series
of instruments is designed to operate on both PAL and NTSC standards, so some
of the tolerances are defined in millivolts and IREs; in these dual value tolerances, P AL values appear in parentheses.
Performance Requirements (Req) . Items with this designation are critical to
instrument performance. In most cases, a tolerance and a performance verification step number are listed. However, there are a few areas where instrument
operation verifies that the performance requirement is met.
Product Description
Reference Information (RI). This information about the instrument operation may
have a tolerance listed, but these should be considered as typical, not absolute.
Performance Verification Step. This item identifies the location of the test method
in the Performance Verification procedure.
The specifications listed in the Electrical Specifications portion of these tables
apply over an ambient temperature range of +0 _ Cto+40_C. The rated
accuracies are valid when the instrument is calibrated in an ambient temperature
range of +20 _Cto+30_C.
The 1740A/1750A/1760 Series is a half-rack width by three-rack-unit high
instrument. It is a versatile waveform monitor/vectorscope for composite and
component television signals. Most circuitry and the mechanical components are
shared throughout the series. In addition to NTSC and PAL standard versions, a
dual standard (NTSC/PAL) version is available.
1740A Series, 1750A Series, & 1760 Series Service Manual
1- 1
Specifications
These instruments employ a bright, post accelerated CRT with lighted internal
graticule. The parallax free internal graticule structure contains targets and
markings for both the vector and waveform functions. The “Lightning” graticule,
for the 1760 Series, is electronic, in order to keep from complicating the
waveform/vector graticule. Option 74, which uses a white phosphor (P4) CRT, is
available for all three instrument series.
These monitors are microprocessor controlled to provide greater versatility.
Switch settings, affecting the operation of the instrument, are continuously
polled by the processor, with any change in status acted upon immediately.
Current operating conditions are preserved in Non-Volatile Random Access
Memory (NOVRAM), which returns the front panel settings to the current
settings, in the event of power interruption (either accidental or routine power
down).
Many operational measurements are performed on a repetitive basis, and these
instruments provide a method of repeating common measurements by simply
selecting stored measurement settings from a CRT menu list. The common
measurement front panel settings can be stored and named by the user. Measurement specific, front-panel settings can be recalled by pushing the front-panel
Preset Menu button and selecting the desired preset by name or number.
Many functions that were formerly selected by changing internal jumpers and/or
wire straps are now accessible through on screen menu selections. Menus are
selected by pushing the appropriate front panel Menu selection. Menu items are
then selected by pushing one or more of the assignable switches and/or rotating
the assigned front-panel control. Once selected these menu choices are retained
until changed by subsequent reconfiguration.
The front panel provides both assignable switches (located next to the CRT) and
controls (located beneath the CRT), that operate with CRT readout to increase
functionality without cluttering the limited front panel area. Function of these
switches and controls is dictated by the front-panel Display and initial Menu
choices.
The 1740A Series is a full capability waveform/vector monitor that also provides
audio and time code measurements. The 1750A Series has all of the capabilities
of the 1740A Series, with the addition of SCH phase measurements.
The 1760 Series combines component measurements with the composite
capabilities of the 1740A/1750A Series. It incorporates all of the measurements
of the 1740A Series with a full set of component analog measurements. The
assignable cursors, along with the CRT readout can be used for time, voltage,
and phase measurements. The system of Menus and CRT readout simplifies the
configuration of this monitor for measurement or monitoring of signal characteristics.
1- 2
1740A Series, 1750A Series, & 1760 Series Service Manual
Specifications
Table 1- 1: Waveform vertical deflection
Characteristic Performance requirement
Deflection Factor Req: 1 V full scale (X1): 1 volt input displayed within 1% of 140 IRE (1.00 VPAL)
X5 Gain: 0.2 volt input displayed within1% of 140 IRE (1.00 VPAL)
X10 Gain: 0.1 volt input displayed within 1% of 140 IRE (1.00 VPAL)
RI: Any one of the 8 inputs
Performance Verification Procedure Step
RI:
1 V , 0.2 V, and 0.1 V from accurate source (VAC) can be made full scale.
V ariable Gain Range Req: 0.2X to 1.4X
Performance Verification Procedure Step
RI:
VAC of 1 V and 0.2 V can be displayed as full scale with appropriate Gain
settings.
:9
:9
Overscan Req: ≤1% variation in baseline of chroma when positioned anywhere between sync tip
and 100% white
RI: X1, X5, or X10 with any variable gain setting
Performance Verification Procedure Step
RI: 1 V peak to peak Modulated Sin
: 16
2
composite video signal.
Frequency and Transient response performance requirements (PR), with any gain
setting, override any overscan specification.
Video Maximum Operating Input Voltage RI: --1.8 V to +2.2 V, (all inputs, A -- B3) DC+peak AC
Absolute Video Input Voltage RI: --8.5 V to +8.5 V ( DC+peak AC)
Video Input DC Impedance RI: ≥20k Ω
Video Input Return Loss RI: Typically ≥40 dB to 6 MHz
RI: Loop through terminated in 75 Ω. Power on or off.
Video Input DC Offset Between Channels Req: ≤1IRE(7mVPAL)
RI: Typically ≤1mV
Performance Verification Procedure Step
RI: Inputs terminated in 75 Ω.
: 4
Video Input Offset Range RI: CHA2, A3, B2, & B3 can be offset from CHA1 or CHB1 by ±350 mV
RI: No signal applied, terminated in 75 Ω and rotate Variable Gain between
minimum and maximum.
Video Input Loop-Through Isolation RI: Typically ≥70 dB
Video Input Crosstalk Between Channels RI: Typically ≥60 dB
RI: All inputs terminated in 75 Ω.
Frequency Response (Flat)
Req: ±2% to 10 MHz (X1 Gain)
±4% to 10 MHz (X5 and X10 Gain), on screen signal (0.2 V or 0.1 V)
RI: Leveled Sinewave Generator
RI: All inputs AC or DC coupling
Performance Verification Procedure Step
1740A Series, 1750A Series, & 1760 Series Service Manual
: 12
1- 3
Specifications
Table 1- 1: Waveform vertical deflection ( Cont.)
Characteristic Performance requirement
Luminance Filter Gain Req: 1 ±1%
RI: Reference is FLAT at 50 kHz
Performance Verification Procedure Step
RI: Leveled Sinewave Generator.
Luminance and chrominance filter offset is typically 1mV.
: 13
Luminance Filter Response Req: ≤3 dB attenuation at 1 MHz
≥40 dB attenuation at F
SC
Performance Verification Procedure Step: 13
RI: Leveled Sinewave Generator.
Luminance Filter Chrominance Rejection
(1745A--1755A-- 1765 only)
Req: ≥34 dB
RI: Leveled Sinewave Generator.
Chrominance Filter Gain Req: 1 ±1%
RI: Ref. is flat at F
(3.58 or 4.43 MHz)
SC
Performance Verification Procedure Step
RI: Leveled Sinewave Generator.
Luminance and chrominance filter offset is typically 1mV.
Chrominance Filter Bandwidth Req: 1.5 MHz ±0.3 MHz
Chrominance Filter Attenuation at 2X F
SC
Differentiated Step Filter Attenuation at 2X F
SC
RI: Centered at F
RI: Leveled Sinewave Generator
RI: ≥25 dB
RI: ≥40 dB
. Passband is typically FSC+ and -- 750 kHz
SC
Transient Response Req: Pulse-to-Bar Ratio 0.99:1 to 1.01:1
RI: Preshoot ≤1%
RI: Overshoot ≤1%
RI: Ringing ≤1%
RI: 2T pulse and bar, any gain setting.
Field-Rate Tilt ≤1%
Req:
RI: Field rate square wave or vertical window signal.
Req: Line-Rate Tilt ≤1%
RI: 25 sbar.
RI: Differential Gain ≤1%
Performance Verification Procedure Step
: 14
: 17
Pix Out Gain Req: 1±3%
RI: Leveled Sinewave Generator and Peak-to-Peak Detector.
Pix Out Frequency Response Req: ±3%to6MHz
RI: A leveled sinewave generator with the output terminated in 75 Ω.
Pix Out Differential Gain RI: ≤1%
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1740A Series, 1750A Series, & 1760 Series Service Manual
Table 1- 1: Waveform vertical deflection ( Cont.)
Characteristic Performance requirement
Pix Out Differential Phase RI: ≤1°
Pix Out Output Impedance RI: 75 Ω
Pix Out Return Loss Req: Typically ≥ 30 dB to 6 MHz
RI: Power on.
Specifications
Pix Out Line Select Strobe RI: (AUD) A DC offset is added to output in line select to bright up the selected
line or lines.
RI: Checked in both 15--line and 1 line.
DC Restorer 60 Hz (50 Hz) Attenuation Req: Slow Mode ≤10%
Fast Mode ≥95%
RI: Back porch or sync tip clamp point is selected through menu.
Performance Verification Procedure Step
RI: 60 Hz (50 Hz) sinewave generator.
: 18
DC Restorer Offset Error Req: ≤1IRE(7 mVPAL)
RI: Typically 3 mV
Performance Verification Procedure Step
RI: No signal applied, terminated in 75 Ω. Rotate Variable Gain between mini-
: 4
mum and maximum.
Fast Settling Time RI: (AUD) ≤6 video lines
Blanking Shift with 10 to 90% APL Change Req: ≤1IRE(7mVPAL)
Blanking Shift with Presence and Absence of
Burst
Performance Verification Procedure Step
RI: APL Bounce signal.
Req: ≤1IRE(7mVPAL)
Performance Verification Procedure Step
RI: Typically 3 mV
RI: Burst on test signal turned off and on.
: 19
: 19
1740A Series, 1750A Series, & 1760 Series Service Manual
1- 5
Specifications
Table 1- 2: External reference
Characteristic Description
Input RI: Composite video or black burst
Maximum Operating Input Voltage RI: --1.8 V to +2.2 V , DC + peak AC
Absolute Maximum Input Voltage RI: --8.5 V to +8.5 V, DC + peak AC
DC Input Impedance RI: ≥20 k Ω
Return Loss RI: Typically ≥40 dB to 6 MHz
Performance Verification Procedure Step
RI: Loop-through terminated in 75 Ω. Power on or off.
Table 1- 3: Waveform horizontal deflection
Characteristic Description
: NO TAG
Sweep Req: Synchronization: Sweep triggered by horizontal and vertical sync pulses
RI: Sweep Length: ≈12 divisions
RI: Sweep freeruns without input
Performance Verification Procedure Step
: 8
Sweep Timing Accuracy Req: 1 Line: 5 s/division ±1%
2 Line: 10 s/division ±1%
RI: Checked over the center 10 div. of sweep.
RI: 1 Field: displays one full field, including field rate sync
2 Field: displays two full fields and the field rate sync between them
Performance Verification Procedure Step
: 7
Sweep Linearity Req: 1 line: ±1%
2 line: ±1%
Performance Verification Procedure Step
RI:
0.5 minor division. Checked over the center 10 divisions of sweep.
:7
Magnified Sweep Accuracy Req: 1 Line: 0.2 s/division ±1%
2 Line: 1.0 s/division ±1%
RI: Checked over the center 10 div. of unmagnified sweep, excluding the first
and last 2 div. of magnified display.
Performance Verification Procedure Step
: 7
Magnified Sweep Linearity Req: 1 line: ±1%
2 line: ±1%
Performance Verification Procedure Step
RI: Checked over the center 10 div. of unmagnified sweep, excluding the first
: 7
and last 2 div. of magnified display.
Horizontal Position Range Req: Any portion of the synchronized sweep can be positioned on screen in all sweep
modes.
: 5
1- 6
Performance Verification Procedure Step
RI:
Color bar signal from serial digital generator in magnified 2--line sweep.
1740A Series, 1750A Series, & 1760 Series Service Manual
Table 1- 3: Waveform horizontal deflection ( Cont.)
Characteristic Description
External Horizontal Input Req: 2 divisions/volt, ±2%
RI: Menu is selected and enabled by REMOTE connector ground closure.
Performance Verification Procedure Step
RI: 5 V = 10 divisions
Remote Sync RI: Input Amplitude: TTL level
RI: Frequency: 25 Hz to 100 Hz positive edge-triggered sweep
RI: Enabling Signal: TTL low or ground closure
Performance Verification Procedure Step
Table 1- 4: Measurement cursors
Characteristic Description
Specifications
: 29
: 33
Waveform Accuracy(P-SPEC-CD) Req: Voltage: 0.5%
Timing: 0.5%, for line rate sweeps
RI: Typically 0.5% for field rate sweeps
Performance Verification Procedure Step
RI: Cursors are calibrated against the VAC.
: 9 & 6
V ector Accuracy(P - SPEC - CD) Req: Gain: ±1.5%
Phase: ±1°
RI: Measured with respect to the Color Bar signal
Performance Verification Procedure Step
: 10
Table 1- 5: RGB/YRGB
Characteristic Description
RGB/YRGB Req: RGB Staircase input gain: 0.8 V/division ±10%
RI: RGB Sweep Length:
1 Field ≈30% of normal
1Line≈ 30% of normal
RI: (AUD) YRGB Sweep Length:
1 Field ≈ 25% of normal
1Line≈ 25% of normal
RI: 2 kHz, 10 V square wave through REMOTE connector RGB Input.
RI: Maximum staircase operating signal: DC signal plus peakAC not to exceed
--12 V to+12 V. Line or field rate sweep.
RI: Peak-to-peak ACsignal not to exceed 12 V .
RI: Sweep Repetition Rate: Field or line rate of displayed video or external
sync signal as selected by the front-panel sweep selection
Performance Verification Procedure Step
: 30
1740A Series, 1750A Series, & 1760 Series Service Manual
1- 7
Specifications
Table 1- 6: Calibrator
Characteristic Description
Waveform Square Wave Req: Amplitude: 1.0 V ±0.5%
Performance Verification Procedure Step
RI: Calibrated against the VAC.
Frequency: 100 kHz ±0.1%
Req:
RI: Frequency counter.
RI: Crystal controlled 10 s square wave
Performance Verification Procedure Step
: 9
: 6
Waveform Sine Wave Req: Amplitude: 1.0V
RI: Measured against the VAC.
p-p
, ±1%
V ector Circle RI: Circle that approximates the graticule compass rose
Table 1- 7: Vector mode
Characteristic Description
Input Requirements Req: 1 V peak--peak ±6dB
RI: Black burst or composite video.
RI: Instrument freeruns with no input
RI: External Reference: Black burst or composite video
V ector input range is ±12 dB.
Nominal Subcarrier Frequency (FSC) RI: NTSC 3.579545 MHz
Chrominance Processing Bandwidth (--3 dB) Req: 1MHz±200 kHz
PAL +V RI: V Axis is inverted at 1/2 video line rate
PAL 4.43361875 MHz
Performance Verification Procedure Step
RI:
Leveled sinewave generator.
: 15
Display Phase Accuracy Error Req: ≤1.25°
Performance Verification Procedure Step
RI: Color bar generator
Display Gain Accuracy Error Req: ≤2.5% with 75% amplitude color bars
Performance Verification Procedure Step
Quadrature Phasing Error Req: ≤0.5° (RI: Bursts set to targets)
Performance Verification Procedure Step
Subcarrier Regenerator Pull-in Range Req: (AUD) NTSC : ±50 Hz
PAL: ±10 Hz
Performance Verification Procedure Step
Subcarrier Regenerator Pull-in Time RI: ≤2 seconds
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1740A Series, 1750A Series, & 1760 Series Service Manual
: 23
: 23
: 22
: 24
Table 1- 7: Vector mode (Cont.)
Characteristic Description
Specifications
Phase Shift with FSCChange Req: NTSC: ≤2° (FSCto FSC±50 Hz)
Phase Shift with Burst Amplitude Change of
±6dB
PAL: ≤2° (F
Req: ≤ 2°
Performance Verification Procedure Step
RI: Color bar generator.
to FSC±10 Hz)
SC
Phase Shift With Video Input Channel Change Req: ≤1°
RI: With external reference selected.
Typically ≤0.5°
Performance Verification Procedure Step
Phase Shift With Variable Gain Control +3 dB
to --6 dB
Req: ≤0.5°
Performance Verification Procedure Step
RI: Color bar generator.
Burst Jitter RI: ≤0.5° rms
RI: 140 IRE (1 V) composite video input.
Clamp Stability Req: ≤1/64 inch (0.4 mm)
RI: Center spot movement with rotation of the phase control
Performance Verification Procedure Step
Phase Control Range RI: 360° continuous rotation
Performance Verification Procedure Step
Phase Control Quantization RI: ≤0.2°
: 25
: 27
: 26
: 28
: 28
Position Control Range Req: ≥0.236 inch (6 mm) from center
Performance Verification Procedure Step
RI: Color bar generator.
Differential Phase Req: ≤1°
Performance Verification Procedure Step
RI: Measured with 140 IRE (1 Volt) linearity signal (5--step, 10-- step, or ramp)
with 40 IRE (300 mV) subcarrier.
Differential Gain Req: ≤1%
Performance Verification Procedure Step
RI: Measured with 140 IRE (1 V) linearity signal (5--step, 10--step, or ramp)
with 40 IRE (300 mV) subcarrier.
Table 1- 8: Audio mode
Characteristic Description
Input RI: DC coupled, differential input
Input Impedance RI: 20 k Ω
: 28
: 21
: 21
1740A Series, 1750A Series, & 1760 Series Service Manual
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Specifications
Table 1- 8: Audio mode (Cont.)
Characteristic Description
Full Scale Selection RI: 0, 4, 8, & 12 dBm full scale. Menu selected
Full Scale Accuracy Req: ±0.5 dB
RI: Measured at 1 kHz
Performance Verification Procedure Step
Maximum Input Voltage RI: ±8 V peak
RI: Measured to chassis ground
Bandwidth (--3 dB) Req: -- 3 d B ≥200.0 kHz
Performance Verification Procedure Step
RI:
Leveled sinewave generator.
X & Y Input Phase Matching Req: ≤1°
RI: Measured at 20 kHz
Performance Verification Procedure Step
: 31
: 32
: 33
Table 1- 9: Time code
Characteristic Description
Input RI: Longitudinal Time Code. DC coupled, differential input
Input Impedance RI: 20 k Ω.
Input Amplitude RI: 0, 4, 8, & 12 dBm full scale. Menu
Maximum Input Voltage RI: --10 V to +10 V peak
Bandwidth (--3 dB) Req: ≥200.0 kHz
selectable for 140 IRE (1.0 V) deflection
Performance Verification Procedure Step
RI:
Leveled sinewave generator.
: 32
Table 1- 10: SCH Phase mode (1750 Series and 1760 Option SC Only)
Characteristic Description
Absolute Accuracy Req: ≤5°
RI: Applies over a temperature range of 0 -- 50° C
RI: Calibrated at 25°C. ±3 dB input amplitude.
Typically ≤5° with±6 dB input amplitude
Performance Verification Procedure Step
: 34
Relative Accuracy RI: 2°
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1740A Series, 1750A Series, & 1760 Series Service Manual
Table 1- 10: SCH Phase mode (1750 Series and 1760 Option SC Only) (Cont.)
Characteristic Description
Acquisition Time RI: ≤1 Second
Specifications
Displayed Phase Error Caused by CRT
Geometry Variations
Input Timing RI: Stable display with Video to External Reference timing
Color Frame Range RI: ±70° (Color frame correctly identified when applied external reference
RI: ±1.25°
signal is ≤70° of 0° SCH.)
Performance Verification Procedure Step
: 34
1740A Series, 1750A Series, & 1760 Series Service Manual
1- 11
Specifications
Table 1- 11: Component vector mode (1760 Series Only)
Characteristic Description
V ertical Bandwidth Req: --3dBat≥1.0 MHz
RI: Multiburst signal from TSG300.
Horizontal to Vertical Bandwidth Matching Req: No eye opening at 500 kHz or 2 MHz
RI: Trace-width opening with Y, P
V ertical Gain Accuracy Req: ±2.5%.
RI: With respect to graticule
Performance Verification Procedure Step
Specification will apply to the electronic graticule when it becomes available.
Horizontal Gain Accuracy Req: ±2.5%
RI: With respect to graticule
Performance Verification Procedure Step
Specification will apply to the electronic graticule when it becomes available.
Display to Graticule Registration Req: ≤0.25 box with the color bar black display dot centered in target
RI: Component signal generator.
signal applied.
R,PB
: 35
: 35
V ector Display RI: Ch A2 or B2 is displayed on the horizontal axis and Ch A3 or B3 is dis-
played on the vertical axis.
Table 1- 12: Lightning mode (1760 Series only)
Characteristic Description
V ertical Gain Accuracy Req: ±2%
RI: With respect to electronic graticule
Performance Verification Procedure Step
Horizontal Gain Accuracy Req: ±2%
RI: With respect to electronic graticule
Performance Verification Procedure Step
Electronic Graticule Display RI: Ch A1 or B1 is displayed vertically.
Ch A2 or B2 is displayed horizontally on top half of display.
Ch A3 or B3 is displayed horizontally on bottom half of display.
: 36
: 36
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1740A Series, 1750A Series, & 1760 Series Service Manual
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