Tektronix 7A16P User manual

Tektronix, Inc.
P.O.
Box 500
Beaverton, Oregon 97077
070-2308-00
Product Group 45
Tektron~
COMMITTED TO EXCELLENCE
PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAL.
7A16P
PROGRAMMABLE
AMPLIFIER
INSTRUCTION MANUAL
Serial Number ___ ~_~~ ______ _
First Printing MAY 1978
Revised JUL 1983

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Copyright @; 1978 Tektronix, Inc. All rights reserved.
Contents of this publication may not
be reproduced in any
form without the written permission of Tektronix, Inc.
Products of Tektronix, Inc. and its subsidiaries are covered
by U.S. and foreign patents and/or pending patents.
TEKTRONIX, TEK, SCOPE-MOBILE, and i! are
registered trademarks of Tektronix, Inc. TELEQUIPMENT
is a registered trademark of Tektronix U.K. Limited.
Printed in U.S.A. Specification and price change privileges
are reserved.
INSTRUMENT SERIAL NUMBERS
Each instrument has a serial number on a panel insert, tag,
or stamped
on the chassis. The first number or letter
designates the country of manufacture. The last five digits
of the serial number are assigned sequentially
and are
unique to each instrument. Those manufactured
in the
United States have six unique digits. The country of
manufacture
is identified as follows:
BOOOOOO
100000
200000
300000
700000
Tektronix, Inc., Beaverton, Oregon, USA
Tektronix Guernsey, Ltd., Channel Islands
Tektronix United Kingdom, Ltd., London
Sony/Tektronix, Japan
Tektronix Holland, NV, Heerenveen,
The Netherlands

7A16P INSTRUCTION
TABLE OF CONTENTS
SAFETY SUMMARY
PREFACE
SECTION 1 - INTRODUCTION
Specifications
Summary of Programmable Features
Front-Panel Buttons
Front-Panel Controls
Block Diagram
SECTION 2 - MANUAL OPERATION
@
Installation
Controls, Connectors, and Indicators
INPUT Connectors
A-B Switch
1 Megohm -50 Ohm Switch
AC-GND-DC Switches
POSITION Control
VARIABLE (CAL IN) Control
GAIN Adjustment
BANDWIDTH Switch
POLARITY Swi tch
VOLTS/DIV Switches
IDENTIFY Swi tch
Functional Check
Preliminary Setup
Power-up Sequence
Procedure
General Operating Information
Signal Connections
Vertical Gain Check and Adjustment
Input Coupling
VOLTS/DIV and VARIABLE
POLARITY Switch
Trace Identification
i
vii
ix
1-1
1-6
1-7
1-8
1-10
2-1
2-3
2-3
2-3
2-3
2-3
2-4
2-4
2-4
2-4
2-4
2-5
2-5
2-5
2-5
2-6
2-6
2-8
2-8
2-8
2-8
2-9
2-9
2-9

7A16P INSTRUCTION
Applications
General
Peak-to-Peak Voltage Measurements CAC)
Instantaneous Voltage Measurements CDC)
Comparison Measurements
SECTION 3 - PROGRAMMING
Introduction to the IEEE 488 Bus
A
Typical System
Types Of Instruments
Types of Messages
Maximum Number of Devices
Maximum Cable Length
Electrical Specifications
Bus Signal Lines
Data Bus
Transfer Bus
Management Bus
Bus Messages
7A16P Interface Function Subsets
Source Handshake
Acceptor Handshake
Talker
Listener
Service Request
Remote/Local
Parallel Poll
Device Clear
Device Trigger
Controller
Addressing the 7A16P
Addressing Schemes
Primary Addressing
Secondary Addressing
Determining Device Addresses
ii
2-10
2-10
2-10
2-12
2-14
3-2
3-2
3-2
3-3
3-4
3-4
3-4
3-5
3-5
3-5
3-6
3-8
3-10
3-10
3-10
3-10
3-10
3-11
3-11
3-11
3-11
3-11
3-11
3-12
3-12
3-12
3-12
3-14

7A16P INSTRUCTION
High-Level Messages
Explanation of Command Syntax
Set Commands
Query Commands
Messages
Messages
with Multiple
Messages
with
Multiple
The SET? Query
Messages
with Sets
Query Responses
Low-Level Messages
Set Messages
Query Messages
and
Transmitting Messages
Transmitting Set Messages
Transmitting Query Messages
Serial-Poll Responses
Power on
Command error
Execution error
Busy
Sets
Queries
Queries
WARNING
3-15
3-16
3-16
3-17
3-20
3-20
3-21
3-22
3-22
3-23
3-24
3-25
3-29
3-32
3-32
3-36
3-40
3-40
3-40
3-41
3-41
The remaining portion of this table of contents lists the
Servicing instructions. These Servicing instructions are
for use by qualified personnel only. To avoid electrical
shock, do not perform any servicing other than that called
out in the Operating instructions unless qualified to do so.
SECTION 4 - MAINTENANCE
Preventive Maintenance
Cleaning
Exterior
Interior
Visual Inspection
Lubrication
Troubleshooting
Troubleshooting Aids
Schematic Diagrams
iii
4-1
4-1
4-2
4-2
4-2
4-2
4-2
4-3
4-3

7A16P INSTRUCTION
Circuit-Board Illustrations
Component-Locator Grids
Component and Wiring Color Code
Semiconductor Lead Configurations
Multi-Pin Connector Identification
Rear Interface Connector Pin Locations
Troubleshooting Equipment
Semiconductor Tester
Multimeter
Test Oscilloscope
Plug-in Extender
Troubleshooting Procedure
Check Control Settings
Check Associated Equipment
Visual Check
Check
Instrument Performance
Check Voltages
Trace the Signal
Check Individual Components
Repair and Readjust the Circuit
Specific Troubleshooting Info.
Microprocessor System
Self Test Addresses
Corrective Maintenance
Obtaining Replacement Parts
Standard Parts
Ordering Parts
Soldering Techniques
Attenuator Circuit Board
Circuit Boards (except Attenuator
Board)
Metal Terminals
Component Replacement
Semiconductor Replacement
Front-Panel LED's
Free-Standing Components
iv
4-3
4-3
4-3
4-3
4-3
4-3
4-5
4-5
4-5
4-6
4-6
4-7
4-7
4-7
4-7
4-7
4-7
4-7
4-8
4-9
4-10
4-10
4-11
4-13
4-13
4-13
4-13
4-14
4-14
4-15
4-15
4-16
4-16
4-16
4-16
REV A JUN 1979

7A16P INSTRUCTION
Circuit Board Removal
Removal
of LED and SWITCH Boards
Removal of ATTENUATOR and
ACTUATOR Boards
Removal of AMPLIFIER, SHIELD, and
PROGRAMMING-LOGIC Boards
Recalibration After Repair
Repackaging for Shipment
SECTION 5 - CIRCUIT DESCRIPTION
Introduction
Block Diagram
Attenuator
Input and Coupling Circuit
X10 Attenuators
Buffer Amplifier
Low Impedance Attenuator
Amplifier
Polarity Amplifier
2X Gain Amplifier
Gain Amplifier
Positioning Circuit
Signal Splitter
Microprocessor System
MPU and Memory
PIA's
Power-up Circuit
Clock Circuit
Front Panel Buttons
Switching Logic
GPIB Interface
IEEE 488 Data Bus
Acceptor Handshake
Source Handshake
Readout
Circuit
Basic Readout Operation
Summing the Time Slots
Selecting Rowand Column Currents
Encoding a Time-Slot
MPU Control Example
REV A JUN 1979 v
4-17
4-18
4-18
4-19
4-20
4-20
5-1
5-1
5-3
5-3
5-3
5-5
5-5
5-6
5-6
5-6
5-7
5-7
5-8
5-9
5-9
5-9
5-10
5-11
5-12
5-12
5-13
5-14
5-14
5-14
5-15
5-15
5-16
5-17
5-18
5-18

7A16P INSTRUCTION
SECTION 6 - CALIBRATION
Introduction
Tektronix Field Service
Performance Check
Cali bration
Test Equipment Required
General
Calibration Equipment Alternatives
Checking Programmable Features
Performance Check Procedure
Checking Front Panel Functions and Readout
Checking Balance
Checking Gain
Checking Rise Time
Checking Bandwidth
Calibration Procedure
Preliminary Procedure for Calibration
Check/Adjust MPU Clock Speed
Check/Adjust DC Balance
Adjust Low Frequency Gain
Check/Adjust Gain
Adjust Positioning
Adjust Input Compensation
Adjust Attenuator Compensation
Adjust Low Frequency Compensation
Adjust High Frequency Compensation
Check Bandwidth
SECTION 7 - ELECTRICAL PARTS LIST
SECTION 8 - DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS
SECTION 9 - MECHANICAL PARTS LIST
vi
6-1
6-1
6-1
6-1
6-2
6-2
6-2
6-2
6-5
6-5
6-6
6-6
6-6
6-7
6-8
6-8
6-9
6-10
6-12
6-13
6-15
6-16
6-17
6-18
6-18
6-19
REV A JUN 1979

7A16P INSTRUCTION
SAFETY SUMMARY
This manual contains safety information which the user must follow to ensure safe operation of this instrument. WARNING
information is intended to protect the operator; CAUTION information is intended to protect the instrument. The following
are general safety precautions that must be observed during all phases of operation and maintenance.
[WARNING'
Ground the Instrument
To reduce electrical-shock hazard, the mainframe (oscilloscope) chassis must be properly grounded. Refer to the mainframe
manual for grounding information.
Do Not Operate in Explosive Atmosphere
Do not operate this instrument in an area where flammable gases or fumes are present. Such operation could cause an
explosion.
Avoid Live Circuits
Electrical-shock hazards are present in this instrument. The protective instrument covers must not be removed by operating
personnel. Component replacement and internal adjustments
must be referred to qualified service personnel.
Do Not Service or Adjust Alone
Do not service or make internal adjustments to this instrument unless anotherperson, capable of giving first aid and resusci-
tation, is present.
[WARNING'
Warning Statements
Warning statements accompany potentially dangerous procedures in this manual. The following warnings appear in this
manual and are listed here for additional emphasis.
To avoid electrical shock, disconnect the instrument from the power source before soldering.
To avoid electrical shock, disconnect the instrument from the power source before replacing components.
@
vii