Table Of Contents - Tektronix 7B85 Instruction Manual

7885 Instruction
LISA" OF
ILLUSTRATIONS . . . . . . . . . . . . . . . . . . iv
Applications . . . . . . . . . . . . . . . . . . . . . . . 1-13
LIST OF TA~LI~S . . . . . . . . . . . . . . . . . . . . . . . . . .
v Delayed-Sweep Measurements . . . . . 1-13
SAF T"Y SUMMARY . . . . . . . . . . . . . . . . . . . . . . .
vii Time-Interval Measurements
(Delay-Time Mode). . . . . . . . . . . . . 1-13
Section 1 OPEi~A"i-ING INSTFtUC~'IONS
Differential Time-Interval
Features . . . . . . . . . . . . . . . . . . . . . . . 1-1
Measurements (~ Time Mode) . . . 1-14
Installation . . . . . . . . . . . . . . . . . . . . . 1-1
Delayed-Sweep Magnification . . . . 1-14
Controls, Connectors,
T°riggered Delayed-Sweep Magnifi-
and Indicators . . . . . . . . . . . . . . . . . . . 1-1
cation . . . . . . . . . . . . . . . . . . . . . . . 1-18
Functional Check . . . . . . . . . . . . . . . . 1-1
Independent Mime-Interval
Setup Procedure . . . . . . . . . . . . . . 1~4
Measurements . . . . . . . . . . . . . . . . . . 1-18
Sweep Functions . . . . . . . . . . . . . . 1-4
Normal Sweep . . . . . . . . . . . . . 1-4
Magnified Sweep . . . . . . . . . . . 1-4
SeCtiOn 2 SPECIFICATION
Delaying and Delayed Sweep . . 1-4
~ (Differential) TIME . . . . . . . . . 1-5
Standard Accessories . . . . . . . . . . . . . . . 2-4
Triggering Functions . . . . . . . . . . . 1-5
General Operating Information . . . . . . 1-6
Triggering Switch Logic . . . . . . . . . 1-6
7"riggering Modes . . . . . . . . . . . . . . 1-6
P-P AUTO . . . . . . . . . . . . . . . . . . . 1-6
AUTO . . . . . . . . . . . . . . . . . . . . . . . 1-6 THE REMAINING POR770N OF THIS TABLE OF
NORMaI . . . . . . . . . . . . . . . . . . . . . 1-6
CONTENTS LIS7- SERVICING INSTRUCTIONS .
SINGLE SWeeP . . . . . . . . . . . . . . . 1-6 7HESE SERVICING lNSl"RUCTIONS ARE FOR USE
Trigger Coupling . . . . . . . . . . . . . . . 1-T
BY QUALIFIED PERSONNEL ONLY. TO AVOID
AC . . . . . . . . . . . . . . . . . . . . . . . 1-7 ELECTRICAL SHOCK, DO NOT PERFORM ANY
AC LF REJ . . . . . . . . . . . . . . . . 1-7
SERVICING OTHER THAN '1"HAT CALLED OUT IN
AC HF REJ . . . . . . . . . . . . . . . . 1-7
THE OPERATING INSTRUCTIONS UNLESS QUALI-
DC . . . . . . . . . . . . . . . . . . . . . . . 1-7
F1ED TO DO SO.
Trigger Source . . . . . . . . . . . . . . . . 1-7
INTernal . . . . . . . . . . . . . . . . . . . 1-7
LINE . . . . . . . . . . . . . , . . . . . . . 1-7
EXTernal . . . . . . . . . . ~ ~ ~ ~ ~ - ~ - 1-7
Section 3 1"HEORY OF OPERATION
Trigger Slope . . . . . . . . . . . . . . . . . 1-8
d'~ARNING
Trigger Level . . . . . . . . . . . . . . . . . 1-8
Block Diagram Description . . . . . . . . . . . 3-1
Horizontal Sweep Rates . . . . . . . . 1-8
Trigger Generator . . . . . . . . . . . . . . . . 3-1
Time Measurement . . . . . . . . . . . . 1-8
Sweep Generator . . . . . . . . . . . . . . . . 3-1
Sweep Magnification . . . . . . . . . . . 1-8
Pickoff Amplifiers and Delay
Variable Hold Off . . . . . . . . . . . . . . 1-8
Gate Generator. . . . . . . . . . . . . . . . . . 3-1
Delay-Time Operation . . . . . . . . . . 1-8
Logic . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
TIME Operation . . . . . . . . . . . . . i-11
Digital Voltmeter . . . . . . . . . . . . . . . . . 3-1
TIME Operation in a
Detailed Circuit Description . . . . . . . . . . . 3-3
Dual-Beam Oscilloscope
Logic Fundamentals . . . . . . . . . . . . . . 3-3
Mainframe . . . . . . . . . . . . . . . . . 1-11
Non-Digital Devices . . . . . . . . . . . . . . 3-3
Mainframe Operating Modes . . . . . 1-11
Front-Panel Distribution . . . . . . . . . . . 3-6
REV AUG 1981 I