Service Manuals, User Guides, Schematic Diagrams or docs for : Tektronix 7B92A Dual Time Base (Oscilloscope Plugin) (1975) WW
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TEKTRONIX
INSTRUCTION MANUAL
Tektronix, Inc .
P .O . Box 500
Beaverton, Oregon 97077 Serial Number
070-1752-01 First Printing DEC 1974
are warranted,
ship, for one year . i',o-, y
questions ~ry ,.farranty should be taken up
with your Ti Ell, He~rj F-igineer or representative .
All requests IL -
directed to znp
in your area, assure you he lastesi
service . Please icOLidle the. instrument Type or
P-ri' Number arm Seiia! Number with all -~-quesls l(, . parts
or service .
Specifications and price change privileges reserved .
Copyright , 1974, new material 1975, by Tektronix, Inc .,
Beaverton, Oregon . Printed in the United States of
America . All rights reserved . Contents of this publication
may not be reproduced in any form without permission of
Tektronix, Inc .
U .S .A . and foreign Tektronix products covered by U .S .
and foreign patents and/or patents pending .
TEKTRONIX is a registered trademark of Tektronix, Inc .
7B92A Operators
TABLE OF CONTENTS
PAGE
List of Illustrations ii
List of Tables
SECTION 1 SPECIFICATION 1-1
Electrical Characteristics 1-1
Environmental 1-5
Physical 1-5
SECTION 2 OPERATING INSTRUCTIONS 2-1
Installation 2-1
Front-Panel Controls, Connectors, and Indicators 2-2
Main Triggering Controls 2-2
Sweep Controls 2-4
Delayed Triggering Controls 2-4
Front-Panel Inputs 2-5
Familiarization Procedure 2-5
Setup Procedure 2-5
Sweep Functions 2-6
Triggering Functions 2-6
General Operating Information 2-8
Main Triggering 2-8
Main Trigger Modes 2-8
Main Trigger Coupling 2-8
Main Trigger Source 2-9
Input Impedance 2-9
Trigger Slope 2-9
Trigger Level 2-11
Selecting Sweep Rates 2-11
Time Measurement 2-11
Display Modes 2-11
Delay Time Multiplier 2-12
Delayed Sweep Triggering 2-12
Mainframe Operating Modes 2-13
Applications 2-13
Time Duration Measurements 2-13
Determining Frequency 2-13
Risetime Measurements 2-14
Delayed Sweep Measurements 2-14
Delayed Sweep Magnification 2-15
Triggered Delayed Sweep Magnification 2-16
Displaying Complex Signals Using Delayed Sweep 2-16
Pulse Jitter Measurements 2-17
SECTION 3 OPTIONS 3-1
REV . A, NOV . 197 5
7B92A Operators
LIST OF ILLUSTRATIONS
FIGURE NO . PAGE
1-1 7B92A Dual Time Base . iv
2-1 Location of Variable and Mainframe Selector multi-pin 2-1
connectors .
2-2 Location of release latch. 2-2
2-3 Front panel controls and connectors . 2-3
2-4 Effect of LEVEL control and SLOPE switch on crt display . 2-10
2-5 Area of graticule used for most accurate time measurements . 2-11
2-6 Typical alternate sweep display. 2-12
2-7 Measuring the time duration between points on a waveform . 2-13
2-8 Measuring risetime . 2-14
2-9 Measuring time difference using delayed sweep. 2-15
2-10 Using delayed sweep for magnification. 2-16
2-11 Displaying a complex signal using delayed sweep. 2-17
2-12 Measuring pulse jitter . 2-18
7B92A Operators
LIST OF TABLES
TABLE NO . PAGE
1-1 Electrical Characteristics 1-1
1-2 Environmental 1-5
1-3 Physical 1-5
2-1 Risetime Measurements 2-14
7B92A Operators
175215
7B92A Features
The 7B92A Dual Time Base unit provides normal, delayed, intensified, and al et nate sweep operation for Tektronix 7000-
Series Oscilloscopes . Calibrated sweep rates from 0 .2 second to 0 .5 nanosecond and triggering to 500 megahertz are pro-
vided . The 7B92A is intended for use with high frequency 7000 Series Oscilloscope systems ; however, most 7B92A
functions are compatible with all 7000-Series Oscilloscopes .
Other features include lighted pushbutton switches, compatibility with indicator oscilloscopes having an alphanumeric read-
out system, and 0 to 9 .8 times continuous sweep delay . A VARIABLE control allows continuously variable sweep rates be-
tween calibrated steps . Also, when operating in the AUTO BRAIN TRIGGERING MODE, a bright base line is displayed in
the absence of a trigger signal .
Fig. 1-1 . 7B92A Dual Time Base .
iv REV . A, NOV. 1975
Section 1-7B92A Operators
SPECIFICATION
This instrument will meet the electrical characteristics listed under Performance Requirement in Table 1-1, following com-
plete calibration . The following electrical characteristics apply over an ambient temperature range of OOC to +500C, except
as otherwise indicated. Warmup time for given accuracy is 20 minutes.
TABLE 1-1
Electrical Characteristics
Characteristic Performance Requirement Supplemental
Information
MAIN TRIGGERING
Trigger Sensitivity Triggering Frequency Minimum Triggering
Range Signal Required
Operating in AUTO, NORM, or INT2 EXT3
SINGLE SWEEP MODE (div) (mV)
COUPLING
AC 30 Hz to 20 MHz 0.5 100
20 MHz to 500 MHz 1 .0 500
AC LF REJ' 30 Hz to 20 MHz 0.5 100
20 MHz to 500 MHz 1 .0 500
AC H F REJ 30 Hz to 50 H z 0.5 100
DC Dc to 20 MHz 0.5 100
20 MHz to 500 MHz 1 .0 500
Operating in HF SYNC MODE
AC 100 MHz to 500 MHz 0.5 100 Use NORM or SINGLE
AC LF REJ SWEEP MODE for signals
DC below about 30 Hz
AC HF REJ Not recommended for HF
SYNC mode
External Trigger Input
Level Range
EXT At least + and -3 .5 volts Not applicable in HF SYN(
MAIN TRIGGERING
EXT - 10 At least + and -35 volts Mode
Maximum Safe Input
1 M52 Input 250 V (dc + peak ac)
5052 Input 1 W average (7 V rms)
' Will not trigger on the sine waves of 8 div amplitude or less (internal), or 3 V or less (external) at 60 Hz or below.
z For Internal Triggering only, the specified -3 dB frequency of the Vertical System replaces any frequencies in the above table when the num-
ber in the table is greater than the -3 dB frequency of the Vertical System .
s Triggering signal amplitude requirements increased by factor of 10 for EXT _ 10 operation.
REV. A, APR . 1975
Specification-71392A Operators
TABLE 1-1 (cont .)
Electrical Characteristics
Supplemental
Characteristic Performance Requirement
Information
MAIN TRIGGERING (cont.)
Input R and C
1 MR Input Approximately 1 MR
paralleled by approxi-
mately 20 pF
50 SZ Input
Resistance 50 R within 7%
Reflection Coefficient (Time 0.1 p-p (using 1 GHz Re-
Domain) flectometer)
Trigger Jitter
Internal or External 50 ps or less at 500 MHz
DELAYED TRIGGERING
Trigger Sensitivity Triggering Frequency Minimum Triggering
Range Signal Required
INTO EXT
(div) (m V)
COUPLING
AC 30 Hz to 20 MHz 0.5 100
20 MHz to 500 MHz 1 .0 500
DC Dc to 20 MHz 0.5 100
20 MHz to 500 MHz 1 .0 500
Trigger Jitter
Internal or External 50 ps or less at 500 MHz
External Trigger Input
Level Range
EXT At least +3 .5 V to -3 .5 V
Maximum Safe Input
1 MR Input 250 V (dc + peak ac)
50 S2 Input 1 W average (7 V rms)
Input R and C
1 MR Input Approximately 1 MR
paralleled by approxi-
mately 20 pF
"The specified -3 dB frequency of the Vertical System replaces any frequencies in the above table when the number in the table is greater than
the -3 dB frequency of the Vertical System .
REV. A, APR . 1975
Specification-71392A Operators
TABLE 1-1 (cont .)
Electrical Characteristics
Performance Requirement Supplemental
Characteristic Information
DELAYED TRIGGERING (cont .)
Input R and C (cont .)
50 St Input
Resistance 50 S2 within 7%
Reflection Coefficient (Time 0 .1 p-p (using 1 GHz
Domain) Reflectometer)
NORMAL, ALT (Delayed Sweep
Trace) and DLY'D SWEEP
Sweep Rates 0 .2 s/div to 0 .5 ns/div in 27 calibrated steps Selected by TIME/DIV
switch . Steps in a 1-2-',
sequence
Sweep Accuracy Measured in 7900-Series Oscilloscope
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