Tektronix - 7B87 - Generator
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Tektronix 7B87
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Equipment:
7B87
Date:
1986
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Information
7B87 FEATURES
The 7B87 Time-Base unit Pretrigger Acquire Clock provides
calibrated sweep rates from 5 seconds lo 10 nanoseconds and
triggering to 400 megahertz (or 7000 Series Oscilloscope A
X10 Magnifier increases each sweep rate by a factor of 10
and a VARIABLE TIME/ DIV control provides
continuously-variable sweep rates between calibrated steps
Variable holdoff and alphanumeric readout are provided Also,
when operating in the AUTO TRIGGERING MODE, a bright
baseline trace is displayed in the absence of a trigger
signal The 7B87 can be operated as an independent time base
or as a delayed-sweep unit with a companion delaying
time-base unit Sweep mode is determined by the companion
delaying time base
The 7B87 also features an internally-generated clock and an
external clock input for sequential single sweep acquisition
when operating in a 7000 series digitizing Oscilloscope The
frequency range of the internally generated clock is 20 48
mHz (millihertz) to 20 48 MHz as determined by the TIME DIV.
X10 MAG. and INT - 1000 switches Also, an ACOUIRE-STOP DELAY
function varies delay pickoff. and therefore pretrigger
time, in compatible digitizing Plug-In Oscilloscope The
portion of the Oscilloscope real time display between the
triggering event and the end of delay time is intensified
The exact delay time is displayed on the crt readout
1 Manual
Service and user manual
Manual type:
Service and user manual
Pages:
128
Size:
36.0 MB
Language:
english
Revision:
revised
Manual-ID:
070-2788-00
Date:
January 1986
Quality:
Scanned document, all readable.
Upload date:
April 23, 2017
MD5:
2a489022-bb49-891e-6c5d-6778b7c8569b
Downloads:
933
Information
PAGE PAGE
LIST OF ILLUSTRATIONS.................................iii
LIST OF TABLES.........................................iv
OPERATORS SAFETY SUMMARY..........................v
SERVICING SAFETY SUMMARY.......................... vii
SECTION 1 OPERATING INSTRUCTIONS
INSTALLATION ................................... 1-1
CONTROLS. CONNECTORS. AND INDICATORS...... 1-1
FUNCTIONAL CHECK.............................. 1-1
SETUP PROCEDURE............................ 1-1
SWEEP FUNCTIONS............................ 1-4
TRIGGERING FUNCTIONS ...................... 1-4
PRETRIGGER ACQUIRE CLOCK FUNCTIONS.....1-5
GENERAL OPERATING INFORMATION.............. 16
TRIGGERING SWITCH LOGIC................... 1-6
TRIGGERING MODES .......................... 1-6
TRIGGER COUPLING........................... 1-9
TRIGGER SOURCE............................. 1-9
TRIGGER SLOPE.............................. 1-11
TRIGGER LEVEL.............................. 1-11
HORIZONTAL SWEEP RATES.................. 1-11
TIME MEASUREMENT......................... 1-11
SWEEP MAGNIFICATION...................... 1-11
VARIABLE HOLD OFF......................... 1-12
MAINFRAME OPERATING MODES............. 1-12
APPLICATIONS ..................................... 1-12
TIME INTERVAL MEASUREMENTS................ 1-12
PERIOD AND FREQUENCY MEASUREMENTS ... 1-12 RISE-TIME AND
FALL-TIME MEASUREMENTS .. 1-13 PULSE WIDTH
MEASUREMENTS............... 1-14
SECTION 2 SPECIFICATION
STANDARD Accessories 2-4
THE REMAINING PORTION OF THIS TABLE OF CONTENTS LISTS
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 3 -THEORY OF OPERATION
BLOCK DIAGRAM DESCRIPTION...................... 3-1
TRIGGER Generator 3-1
SWEEP Generator 3-1
PICKOFF Amplifier AND DELAY GATE Generator 3 1
LOGIC............................................ 3-1
DIGITAL VOLTMETER .............................3-1
CLOCK Generator 3-1
DETAILED CIRCUIT DESCRIPTION.....................3-1
FRONT-PANEL DISTRIBUTION .....................3-3
TRIGGER Generator 3-3
EXTERNAL SOURCE............................3-3
INTERNAL AND UNE SOURCE.................. 3-3
TRIGGER SOURCE SELECTOR AND Amplifier 3-3
PEAK TO-PEAK AUTO.......................... 3-3
SLOPE SELECTOR AND TRIGGER Generator 3 5
GATE Generator 3-5
LOGIC............................................ 3-5
SWEEP MODES................................3-5
HOLD OFF TIMING.............................3-6
LOCKOUT BUFFER Amplifier 3-7
HOLD OFF OUTPUT Amplifier 3-7
SWEEP Generator 3-7
TIMING Current source 3-7
RAMP Generator 3 10
HORIZONTAL PREAMPLIFIER..................3-10
SWEEP GATE Generator 3-10
DVM............................................3-10
DELAY TIME COMPARATOR AND DELAY
GATE Generator 3-10
DIGITAL VOLTMETER ............................3-11
DELAY COMPARISON VOLTAGE TO RAMP Converter 3-12
COMPARATOR ...............................3-12
REFERENCE Current source 3-12
REFERENCE CURRENT INVERTER..............3-12 Counter AND ENCODER.....................3-12
CLOCK Generator 3-12
CONTROL LOGIC .............................3-13 Oscillator 3-13
FIRST DIVIDER................................3-15
XT XTO MULTIPLEXER ........................3-15
DECADE DIVIDER.............................3-15
INTERNAL CLOCK MULTIPLEXER ..............3-15
OUTPUT CLOCK MULTIPLEXER................3-15
INTENSIFY CIRCUIT ...........................3-15 7B87 IN A HORIZ PLUG IN COMPARTMENT.......3 16
INTERNAL BUTTON PRESSED..................3-16 7B87 IN B HORIZ Plug-In COMPARTMENT .......3-16
INTERNAL BUTTON PRESSED..................3 16
TIME DIVISION AND READOUT SWITCHING.......3-17
BASIC READOUT SYSTEM.....................3 17
TIME DIVISION READOUT.....................3-17
ACQUIRE-STOP DELAY TIME READOUT........3-17 Interface CONNECTIONS AND POWER
SUPPLY......................................3-17
SECTION 4 MAINTENANCE
PREVENTIVE MAINTENANCE .........................4 1
CLEANING........................................4 1
EXTERIOR.....................................4-1
INTERIOR...................................... 4 1
SWITCH CONTACTS............................ 4 1
.............................. 4-1
LUBRICATION .................................... 4-1
CAM SWITCH LUBRICATION.................... 4-2
SEMICONDUCTOR CHECKS ....................... 4-2
ADJUSTMENT AFTER REPAIR ..................... 4-2
TROUBLESHOOTING................................. 4-2
TROUBLESHOOTING AIDS......................... 4-2
DIAGRAMS.................................... 4-2
VOLTAGES AND WAVEFORMS................. 4-2
CIRCUIT-BOARD ILLUSTRATIONS............... 4-2
SWITCH CAM IDENTIFICATION ................. 4-4
DIODE COLOR CODE........................... 4-4
WIRING COLOR CODE ......................... 4-4
SEMICONDUCTOR LEAD CONFIGURATIONS..... 4-4
INTER-BOARD PIN CONNECTOR
IDENTIFICATION............................44
MULTI-PIN CONNECTOR IDENTIFICATION .......4-4 Interface CONNECTOR PIN LOCATIONS.......4 5
PERFORMANCE CHECK AND ADJUSTMENT.....4-5
STATIC SENSITIVE DEVICES.......................4 5
TROUBLESHOOTING EQUIPMENT..................4-6
TROUBLESHOOTING TECHNIQUES.................4-6
TROUBLESHOOTING PROCEDURE..............4-6
CORRECTIVE MAINTENANCE.........................4-8
OBTAINING REPLACEABLE PARTS.................4-8
SOLDERING TECHNIQUES.........................4-9
COMPONENT REMOVAL AND REPLACEMENT.....4-10
CIRCUIT BOARDS.............................4 10
SWITCHES ...................................4-12
SEMICONDUCTORS...........................4 15
INTERCONNECTING PINS......................4-15
CIRCUIT BOARD PINS.........................4 15
FRONT-PANEL LIGHTS........................4-16
ADJUSTMENT AFTER REPAIR ....................4 16
INSTRUMENT REPACKAGING.....................4 16
SECTION 5 PERFORMANCE CHECK ANO
ADJUSTMENT
PRELIMINARY INFORMATION......................5-1
ADJUSTMENT INTERVAL....................... 5-1 Tektronix FIELD SERVICE.....................5 1
USING THIS PROCEDURE ...................... 5-1
TEST EQUIPMENT REQUIRED...................... 5-1
SPECIAL FIXTURES ............................ 5 1
TEST EQUIPMENT ALTERNATIVES..............5 1
INDEX TO PERFORMANCE CHECK AND
ADJUSTMENT PROCEDURE ....................5 4
PRELIMINARY PROCEDURE........................ 5-4
A TRIGGERING SYSTEM.............................5-5
B HORIZONTAL/AQS SYSTEM......................5-10
SECTION 6-INSTRUMENT OPTIONS
SECTION 7 REPLACEABLE ELECTRICAL PARTS
SECTION 8 DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS
SECTION 9 REPLACEABLE MECHANICAL PARTS CHANGE INFORMATION