Geräte Informationen:

Tektronix 7B87 Generator
Hersteller:
Tektronix
Modell: 7B87
Datum: 1986
Kategorie: Messgeräte
Gruppe: Generator
Beschreibung: Time Base Unit
Informationen:
                                    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 Oscilloscopes 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 oscilloscopes 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

Folgende Anleitungen sind hier verfügbar:

Tektronix -- 7B87 -- Service- und Bedienungsanleitung
Dateiname: Tektronix-8952-Manual-Page-1-Picture
Dokumenttyp: Service- und Bedienungsanleitung
Seitenanzahl: 128
Dateigröße: 35.97 Mbytes (37721496 Bytes)
Sprache: Englisch
Revision: revised
Dokument-ID/Nummer: 070-2788-00
Datum: 01 Januar 1986
Qualität: Gescanntes Dokument, alles ist lesbar.
Upload Datum:
MD5: 2a489022bb49891e6c5d6778b7c8569b
Downloads: 23 seit dem 23 April 2017
Informationen:

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
Tektronix-8952-Manual-Page-1-Picture
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