Tektronix 7B92A User manual

Tektronix, Inc.
P.O.
Box 500
Beaverton, Oregon
070-1751-02
Product Group 42
97077
COMMITTED TO EXCELLENCE
PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAL.
7B92A
DUAL TIME BASE
INSTRUCTION
Serial Number
M~~~~§9'
13
0
99170
First Printing JUN 1978
Revised JUN 1987

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Copyright ~. 1974, 1975, 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 8 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

@
SECTION 1
SECTION 2
TABLE OF CONTENTS
LIST OF ILLUSTRATIONS ................................ .
SAFETY SUMMARY
..................................... .
OPERATING INSTRUCTIONS
Page
iii
v
INTRODUCTION ........................................ 1-1
INSTALLATION ........................................ 1-1
FRONT-PANEL CONTROLS, CONNECTORS, AND INDICATORS. . . .. 1-2
Main
Triggering Controls ................................ 1-2
Sweep
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-4
Delayed Triggering Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-5
Front-Panel
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-5
FUNCTIONAL CHECK .................................... 1-5
Setup Procedure
...................................... 1-6
Sweep Functions
...................................... 1-6
Triggering Functions ................................... 1-7
GENERAL OPERATING
INFORMATION ....................... 1-8
Main
Triggering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-8
Main
Trigger Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-8
Main
Trigger Coupling .................................. 1-9
Main
Trigger Source ................................... 1-10
Input Impedance ...................................... 1-10
Trigger Slope ........................................ 1-10
Trigger Level. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-10
Selecting Sweep Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 1-12
Time Measurement .................................... 1-12
Display Modes ....................................... 1-12
Delay Time Multiplier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-13
Delayed Sweep Triggering ............................... 1-13
SPECIFICATION ........................................ 2-1
I WARNING I
THE FOLLOWING SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PER-
SONNEL ONL Y. TO AVOID PERSONAL INJURY, DO NOT PERFORM ANY SERVICING
OTHER THAN
THAT CONTAINED IN OPERATlNG INSTRUCTIONS UNLESS YOU ARE
QUALIFIED TO DO SO.
SECTION 3 THEORY
OF OPERATION
Block Diagram Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-1
Detailed Circuit Description ................................ 3-1
Main Trigger Generator ................................. 3-1
Delaying Sweep Generator ............................... 3-3
Delayed Trigger Generator ............................... 3-4
Delayed Sweep Generator ............................... 3-6
Horizontal
Logic ...................................... 3-6
Output Amplifier ...................................... 3-7
Readout
............................................ 3-7
7892A

7B92A
TABLE OF CONTENTS (cont)
SECTION 4 MAINTENANCE Page
Preventive Maintenance
................................... 4-1
Cleaning ............................................ 4-1
Visual Inspection ...................................... 4-1
Lubrication .......................................... 4-1
Semiconductor Checks ................................. 4-2
Adjustment After Repair ................................. 4-2
Troubleshooting ........................................ 4-3
Troubleshooting Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-3
Troubleshooting Equipment .............................. 4-6
Troubleshooting Techniques ............................. 4-6
Corrective Maintenance
................................... 4-8
Obtaining Replacement Parts ............................. 4-8
Soldering Techniques .................................. 4-8
Component Removal and Replacement ...................... 4-9
Adjustment After Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-11
Repackaging For Shipment
.............................. 4-11
SECTION 5 PERFORMANCE CHECK/CALIBRATION
Preliminary
Information ................................. 5-1
Test Equipment Required ................................ 5-1
Part I Performance Check ................................. 5-4
Outline for Part I Performance Check ....................... 5-6
A. Trigger Sensitivity ................................. 5-4
B. Horizontal System ................................. 5-4
Preliminary Procedure .................................. 5-4
A. Trigger Sensitivity ................................... 5-5
B. Horizontal System ................................... 5-10
Part II Calibration ....................................... 5-16
Outline for Part II Calibration ............................. 5-16
A. Trigger Sensitivity (SN B070000-above) .................. 5-16
B. Trigger Sensitivity (SN B069999-below) .................. 5-16
C. Horizontal System ................................. 5-17
Preliminary Procedure ................................ 5-17
A. Trigger Sensitivity (SN B070000-above) .................... 5-18
B. Trigger Sensitivity (SN B069999-below) .................... 5-25
C. Horizontal System ................................... 5-33
SECTION 6
OPTIONS
SECTION 7 REPLACEABLE ELECTRICAL PARTS
SECTION 8 DIAGRAMS AND
CIRCUIT BOARD ILLUSTRATIONS
SECTION 9 REPLACEABLE MECHANICAL PARTS
Change Information
ii
@

Figure No.
Frontispiece
1-1
1-2
1-3
1-4
1-5
1-6
LIST OF ILLUSTRATIONS
Page
7B92A Dual Time Base
Location
of Variable and Mainframe Selector multi-pin connectors. ...... 1-1
Location of release latch. .................................... 1-2
Front-panel controls and connectors. ........................... 1-3
Effect
of MAIN TRIGGERING LEVEL and SLOPE controls on crt display. .. 1-11
Area of graticule used for most accurate time measurements. .......... 1-12
Typical alternate sweep display. ............................... 1-13
2-1 Dimensional drawing. ...................................... 2-5
REV APR 1984
4-1 Lubrication procedure for a typical cam switch. .................... 4-2
4-2
Semiconductor lead configurations. ............................ 4-4
4-3
4-4
4-5
5-1
5-2
5-3
5-4
5-4A
5-5
5-6
5-7
5-8
5-9
5-10
5-11
5-12
5-13
5-14
5-15
Inter-board multi-pin connector assembly. ........................ 4-5
End-lead multi-pi n connector assembly. ......................... 4-5
Location
of pin numbers of Interface connector. ................... 4-5
Main
Triggering level range. .................................. 5-6
Delayed Triggering level range. ............................... 5-6
Variable Time/Division range. ................................. 5-13
Fast delay
time accuracy. .................................... 5-14
AC HF
REJ Balance ................................................ 5-19
DC balance. (Circle denotes
correct trigger point.) .................. 5-19
Trigger Sensitivity. (Circle denotes correct trigger pOint.) ............. 5-19
Main
Triggering level range. (Circle denotes triggering limits.) ......... 5-19
Delayed Triggering level range. (Circle denotes triggering limits.) ....... 5-21
DC balance.
(Circle denotes correct trigger point.) .................. 5-26
Trigger sensitivity. (Circle denotes correct trigger point.) ............. 5-26
Main
Triggering level range. (Circle denotes triggering limits.) ......... 5-27
Delayed Triggering level range. (Circle denotes triggering limits.) ....... 5-29
Correct DTM Scale and Delay Start adjustment (circle). .............. 5-34
Variable Time/Division range. ................................. 5-38
Fast delay
time accuracy. .................................... 5-39
7B92A
iii

7B92A
iv
LIST OF ILLUSTRATIONS (cont)
The illustrations in Section 8 are located near their associated diagrams on the foldout pages.
Figure No.
8-1
8-2
8-3
8-4
8-5
8-6
8-7
8-8
8-9
8-10
8-11
8-12
8-13
8-14
8-15
8-16
8-17
8-18
8-19
8-20
8-21
8-22
Circuit board locations
810ck diagram
A3 Coupling Switch circuit board
A5 Delayed Triggering Switch circuit board
A2 Source Switch circuit board
A4 Mode Switch circuit board
A1 External Input circuit board
A8 Main Trigger circuit board
(SN 8070000-above)
A8 Main Trigger circuit board
(SN 8069999-below)
A9 Delayed Trigger circuit board
(SN 8096951-above)
A9 Delayed Trigger circuit board
(SN 870000-8096950)
A9 Delayed Trigger circuit board
(SN 8069999-below)
A6 Interface circuit board
(SN 8095741-above)
A6 Interface circuit board
(SN 8095740-below)
A7 Logic circuit board (SN 8059999-below)
A7 Logic circuit board (SN 8060000-above)
A12 Readout circuit board
Location of Sweep Timing adjustments
Location of Main Trigger adjustments (SN 8069999-below)
Location of Delayed Trigger adjustments
(SN 8069999-below)
Location of Main Trigger adjustments
(SN 8070000-above)
Location of Delayed Trigger adjustments (SN 8070000-above)
REV JAN 1985

@
SAFETY SUMMARY
This manual contains safety information that 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 I
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 another person,
capable
of giving first aid and resuscitation, is present.
WARNING I
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 avoidelectricalshock, disconnect the instrument from the power source beforesoldering.
To avoid electricalshock,
disconnect the instrument from the power source before replacing
components.
Handle
silicone grease with care. Avoid getting silicone grease in eyes. Wash hands
thoroughly after use.
7B92A
v
._-_._--_._----

7B 92A
-
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vi
REV B, JUN 1978

-
-
Section 1- 7B 92 A
OPERATING INSTRUCTIONS
INTRODUCTION
The 7B92A Dual Time Base unit provides normal,
delayed,
inte~sified , and alternate sweep operation for
TEKTRONIX 7DOO-Series Oscilloscopes. Calibrated
sweep rates from 0.2 second to 0.5 nanosecond and
triggering to
500 megahertz are provided. The 7B92A Is
inlended for use with high·frequency 7DOO-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 readout system, and 0 to 9.8
times con·
tinuous sweep delay. A VARIABLE control allows con·
tlnuously variable sweep rates between calibrated steps.
Also, when operating
in the AUTO MAIN TRIGGERING
Mode, a bright base line is displayed in the absence 01 a
trigger signal.
This section describes the operation of the front·panel
controls and connectors, and provides a functional check
and general operating
information for this instrument.
NOTE
The AL T OFFposition, which al/ows the Intensified
mode
of operation. Is applicable to instruments SN
B06OOOO-above .
M... INFII ...... f_.,,;:=;;. 8 ~~,~~;
SELlC'OIl OlHlll li:i) ,..JS
--
---
INSTALLATION
The 7892A is designed to operate in the horizontal
plug·in compartment 01 the oscilloscope. Thisinstrument
can also be installed
in a vertical plug·in compartment to
provide avertical sweep on the crt.However,when used in
this manner, there Bre no internal triggering or retrace
blanking provisions, and the
unit may not meet the
specllications given In the Specification section of this
manual.
Before proceeding with installation, check the settings
01 the Time / Div Variable Selec tormulti·pln connector and
the Mainframe Selector
mulli·pin connector (see Fig. '·1) .
The Time/Div Variable Selector determines whether the
front·panel
Time /Div VARIABLE cont rol operates in con·
junction with the delaying or delayed sweeps. The Main·
frame Selector adapts the 7B92A to the oscillsocope
mainframebeing used. Thetwo mainframeselectionsare :
1. 7800 and 7900-Serles Oscilloscopes.
2. All other 7DOO-Series Oscilloscopes.
NOTE
The 7871 w ill not delay the 7892A for displaying
alternating Delaying
and Delayedsweep s. Instead, if
causes a sweep lock·up to occur underthefollowing
conditions: with the 7871 in the A horizontal com-
17 5 2·02
Fig . ,-,. L ocation 01 Variable and Malnlrame Selec tor mull1- pln co nneclors.
RE V e, JUN 1978 1·1

Operating Ins lruc tio ns- 7B92A
partmentandthe7B92A In theB horizontalcompart-
ment, the sweep locks up if the 7B92A is in its
Alternate mode and the Mainframe Horizontal mode
is Aft. Lock-up can be avoided by changing the
Mainframe Hor izontal mode to Chop or B. This
allows
both 7B92A sweeps to be displayed.
To install the 7B92A in a plug-in compartment, push it
in until it fits firmly into the compartment. The front panel
of the 7B92A should be flush with the front panel of the
oscilloscope. Even though the gain of the oscilloscope Is
standardized. the sweep calibration of the 7B92A should
be checked when Installed. The procedure for checking
the unit
is given under Sweep Calibrationin theOperating
Checkout procedure In this section.
To remove the 7B92A. pull the
re lease latch (see Fig.
'-2) to disengagethe unit from the oscilloscope. and pull it
out 01the plug-In compartment.
RELEASE
L
AT CH
_ n, __
•
...
T
•
1152· 16
FRONT- PANEL CONTROLS ,
CONNECTORS,
AND INDICATORS
All controls,connectors.and indicatorsrequired forthe
operation of the 7B92A,except the Time/Div Variable and
Mainframe Selectors, are located
on the front panel. A
brief description of the front-panel controls, connectors,
and indicators is given here. More detailed
in formation is
given under General Operating Information. Fig.
,-,
' ·2
shows the Tlme/Dlv Variable and Mainframe Selectors.
Fig.
'-3 shows the front-panel controls, connectors, and
Indicators.
MAIN TRIGGERING Controls
(!) LEVEL Control
Selects amplitude point on trigger signal where
sweep triggering occurs when the MAIN
TRIGGERING MODE AUTO, NOR
M, or SINGLE
SWEEP switches are pressed. When the MAIN
TR IGGERING MODE HF SYNC switch is pressed,
the LEVEL control adjusts the frequency of the
trigger generator to synchronize with the frequency
(or sub-harmonic)
of the triggering signal to provide
a stable displ
ay.
CD SLOPE ContrOl
Permits triggering on the positive or negative slope
of the trigger signal (except in HF SYNC).
CD TRIG'D Indicator
When lit, indicates that the sweep is triggered and
will produce a display with
co rrect setting of the
POSITION control and the controls on the
associated amplifier plug-in unit(s) and os-
cilloscope.
oMODE Switches
Select the desired MAIN TRIGGERING mode.
Selected mode is indicated by lighted pushbutton.
AUTO: Selects a triggered sweep initiated by the
applied trigger signal
at a point determined by the
LEVEL control and SLOPE control when the trigger
signal repetition rate
Is above30hertzand withinthe
frequency range selected by the COUPLING
switches. When the LEVEL control is outside the
amplituderange,thetrigger repetition rate isoutside
the frequency range selected by the COUPLING
switches, or the trigger signal is inadequate, the
sweep free--runs
to provide a reference trace.
HF SYNC: Sweep initiated by trigger signals with
repetition rates above 100 megahertz and within the
range selected by the COUPLING switch. Stable
display can be obtained when the LEVEL control
adjusts the frequency
olthe trigger generatorto the
frequency (
or sub-harmonic) of the trigger signal.
When the LEVEL control is adjusted
to frequencies
between sub-harmonics, the sweep free-runs.
Rev e, JUN 1978
-
-
-
-

Operating Instructlon l- 7892A
.....
-
-
..
..
III l!! III
,,-
.....
-
III III III
.....
DO
III III
•
.. ..
III
18
1752 · 11
Ag . '- 3. Fronl -panel cont rol• • nd co nn ec:t Ort .
NORM: Sweep initiated by the applied trigger signal
at a point selected by the LEVEL control and SL
OP E
control over the frequency range selected by the
COUPLING switches. Triggered sweep can be ob-
tained onty over the amplitude range of the apptled
trigger signal. When the LEVEL control is either
outside the amplitude range, the trigger repetition
rale Is outside the frequency range selected by the
COUPLING switches, or the trigger signal Is Inade·
quate. there is no trace.
SINGLE SWE EP-RE SE T: When the SINGLE
SWEEP-RESET switch
Is pressed, asingle trace will
be presented when the next triggerpulse is received.
The SINGLE
SW EEP-RE SE T switch remains lit until
REV B. JUN 19 78
atriggeris received and the sweep iscomp leled.The
SI NGLE SW EEP - RE SET switch must be pressed
again before another sweep can be displayed.
CD COUPLING Switches
Select trigger signal coupling. Selected
coup ling is
indicated by lighted pushbutton.
AC: Rejects dc and attenuates ac signals below
about 30 hertz. Accepts signals between 30 hertz
and 500 megahertz.
1·3

Operating Instructions-7B92A
AC LF REJ: Rejects
dc and attenuates signals below
30 kilohertz. Accepts signals between 30 kilohertz
and 500 megahertz.
AC HF REJ. Rejects dc and attenuatessignals above
50 kilohertz. Accepts signals from 30 hertz to 50
kilohertz.
DC:
Accepts all signals from dc to 500 megahertz.
CD SOURCE Switches
Select the triggering source. Selected source is
indicated
by lighted pushbutton.
INT: Trigger signal obtained internally from
amplifier plug-in unit of oscilloscope.
LINE:
Trigger signal obtained internally from the line
voltage applied to the oscilloscope.
EXT:
Trigger signal obtained from an external
source applied
to the MAIN TRIG IN connector.
EXT -;-10: Trigger signal obtained from an external
source applied
to the MAIN TRIG IN connector. In
this position, the external signal isattenuated before
it is applied
to the trigger circuit.
Sweep Controls
(j) TIME/DIV OR DLY TIME
Selects the basic sweep rate for normal sweep
operation and selects the delay time (multiplied by
the DELAY TIME MUL T dial setting) when operating
in the Alternate or Delayed sweep modes. The
VARIABLE control must be in the CAL (knob in)
position
for calibrated sweep rate.
o DL Y'D Time/Division
1-4
Selects the delayed sweep rate for operation in
Delayed and Alternate sweep modes. The
VARIABLE control must be in the CAL (knob in)
position
for calibrated sweep rate.
Four
display modes can be selected by the following
switch settings:
Normal Sweep: A normal sweepis selected when the
TIME/DIV OR DLY TIME switch and the DLY'D
Time/Division switches are locked together at the
same sweep rate. The DL Y'D Time/Division knob
must be pressed in for normal sweep mode.
Calibrated sweep rates from 0.2 second/division to
0.5 nanosecond/division can be selected
ALT Sweep:
The Alternate mode is selected when
the DLY'D
Time/Division switch is pulled out and
rotated
clockwise and the TRACE SEP control is
turned clockwise from the AL T OFF position. In this
mode,
the delaying sweep is displayed (with an
intensified zone during the time that the delayed
sweep runs) alternately with the delayed sweep.
Intensified Sweep: The Intensified mode, a function
of the delaying and delayedsweeps is selected when
the DL Y'D Time/Division switch is pulled out and
rotated clockwise, and
the TRACE SEP control is
rotated
fully counterclockwise to the AL T OFF
position (see Fig. 1-3). In this mode, a portion of the
delaying sweep is intensified during the
time that the
delayed sweep generator runs.
DLY'D Sweep: The Delayed sweep
mode is selected
when
the DL Y'D Time/Division switch is pulled out,
rotated
for the desired delayed sweep rate, and then
pushed in. In
this mode, the delayed sweep is
displayed at a rate determined
by the DL Y'D
Time/Division switch at the end of each delay
period, as selected by the TIME/DIV OR DLY TIME
switch and the DELAY TIME MUL T dial setting.
CD VARIABLE
Two-position switch actuated by the VARIABLE
control to select calibrated or uncalibrated sweep
rates. In
the CAL position (knob in) the VARIABLE
control is inoperative and the sweep rate is
calibrated. When pressed and released,
the knob
moves out to activate the VARIABLE control for
uncalibrated sweep rates. The sweep rate in each
TIME/DIV OR DLY TIME switch position can be
reduced at least
to the sweep rate of the next slower
position. The VARIABLE control will operate with
either the delaying or delayed sweep by means of the
internal Time/Div Variable Selector.
®POSITION Control
Positions the display horizontally on the graticule.
® CONTRAST Adjustment
Varies the relative brightness of the intensified
portion of the delaying trace when in the Alternate
mode.
® TRACE SEP/ AL T OFF Control
This control vertically positions the delaying sweep
display up to 3.5 divisions above the delayed sweep
display when in the Alternate mode. The AL T OFF
position allows the Intensified sweep mode of
operation,
permitting the display of an intensified
portion of the delaying sweep.
REV B, JUN 1978

@ INTENSITY Control
Varies the intensity of the Intensified sweep only,
when operating in the Intensified or Alternate mode
(must be set near clockwise end when 7B92A is
operating in some 7000-Series Oscilloscopes).
®SWP CAL Adjustment
Screwdriver adjustment sets the basic timing of the
7B92A to compensate for slight differences in input
sensitivity when changing indicator oscilloscopes.
@DELAY TIME MULT Dial
Provides variable delay of 0 to 9.8 times the basic
delay time selected by the TIME/DIV OR DLY TIME
switch.
Delayed Triggering Controls
® LEVEL Control
Determines the delayed trigger mode and the
delayed trigger level.
RUNS AFTER DELAY TIME (LEVEL control turned
fully clockwise into detent): Delayed sweep runs
immediately following the delay time selected by the
TIME/DIV OR DLY TIME switch and the DELAY
TIME MUL T dial. Delayed Slope, Coupling, and
Source functions are inoperative.
Delayed Sweep Triggerable: When the Delayed
Triggering LEVEL control is turned
counterclockwise out of detent, the delayed sweep
is triggerable.
The Delayed Triggering LEVEL con-
trol can now be rotated to select the amplitude pOint
on the trigger signal at which the delayed sweep is
triggered. In
the Delayed Sweep Triggerable mode,
the delayed Slope, Coupling, and Source functions
are activated.
@ SLOPE Switch
Two-position pushbutton switch to select the slope
of the trigger signal which starts the delayed sweep.
+: The delayed sweep can be triggered on the
positive slope of the trigger signal.
-: The delayed sweep can be triggered on the
negative slope of
the trigger signal.
@ SOURCE Switch
Two-position pushbutton switch to select the source
of
the delayed trigger signal.
REV A, JUN 1978
Operating Instructions-7B92A
INT: The delayed trigger signal is obtained from the
vertical amplifier of the oscilloscope.
EXT: The delayed trigger signal is obtained from an
external source connected to the DLY'D TRIG IN
connector.
@COUPLING Switch
Two-position pushbutton switch to determine the
method of coupling the trigger signal to the delayed
trigger circuit.
AC: Rejects
dc and attenautes signals below 30
hertz. Accepts trigger signals from 30 hertz to 500
megahertz.
DC: Accepts
trigger signals from dc to 500
megahertz.
Front-Panel Inputs
® MAIN TRIG IN Connector
Serves as an external trigger input for the main
triggering circuit when the MAIN TRIGGERING
SOURCE EXT or EXT -7- 10 pushbutton switches are
pressed.
® TERM Switch
Two-position pushbutton switch to select 50 ohms
(out position) or 1 megohm (in position) input
impedance for the MAIN TRIG IN and DL Y'D TRIG
IN connectors.
DL Y'D TRIG IN Connector
Serves as an external trigger input for the delayed
triggering circuit when the Delayed Triggering
SOURCE switch is set to EXT.
~
Do not exceed 7 volts (rms) of externalsignal when
50 {1 termination is selected.
FUNCTIONAL CHECK
The following procedures may be used for familiariza-
tion or as a check of basic instrument operation. The
procedure is divided into two parts, Sweep Functions and
Triggering Functions. A complete operating check of the
7B92A
functions can be made by performing both parts, or
each part may be performed separately. If performing the
functional check procedure reveals a malfunction or
1-5

Operating Instructions-7B92A
possible im proper adjustment; fi rst check the operation of
the associated plug-in units, then refer to the instruction
manual for maintenance and adjustment procedures.
NOTE
For optimum high-frequency performance, the
7B92A
should be installed in an oscilloscope system
with similar frequency and sweep-rate capabilites.
Setup Procedure
1. Install the 7B92A in a horizontal compartment of the
oscilloscope.
2. Install the amplifier plug-in unit in a vertical com-
partment.
3.
Turn on the oscilloscope and allow at least 20
minutes warm up.
4. Set the 7B92A controls as follows:
MAIN TRIGGERING
SLOPE
MODE
COUPLING
SOURCE
(+)
AUTO
AC
INT
Delayed Triggering
LEVEL
SLOPE
COUPLING
SOURCE
RUNS AFTER DELAY
TIME
(+)
AC
INT
Sweep Controls
POSITION
Midrange
INTENSITY
As desired
TIME/DIV OR 1 ms
DLY TIME
DL Y'D Time/Division
1 ms (knob in)
VARIABLE
CAL
Time/Div Variable Delayed Sweep
Selector (internal)
DELAY TIME MULT
1.00
TRACE SEP
Midrange
5. Set the oscilloscope to display the plug-in unitsand
adjust
for a well-defined display. See oscilloscope and
amplifier plug-in unit instruction manuals for detailed
operating instructions.
1-6
Sweep Functions
Normal Sweep. Perform the following procedure to
obtain a normal sweep and demonstrate the function of
the related sweep
controls:
1. Perform the Setup Procedure.
2. Connect a 4 volt, one-kilohertz signal from the
oscilloscope calibrator to the amplifier plug-in unit input.
3. Adjust the amplifier plug-in unit volts/division
switch for two divisions of display.
4. Rotate the MAIN TRIGGERING LEVEL control fora
stable display.
5. Rotate the POSITION control and note that the trace
moves horizontally.
6. Check the crt display for one complete cycle per
division. If necessary,
adjust the SWP CAL screwdriver
adjustment for one complete cycle per division over the
center
eight graticule divisions. Be sure that the timing of
the calibrator signal is accurate within 0.5%.
Alternate and Delayed Sweep. Perform the following
procedure to obtain alternate-delayed sweeps and
demonstrate the function of the related sweep controls:
7. Pullout the DLY'D Time/Division knob and rotate
clockwise to 0.1 ms for the Alternate sweep mode. Note
both an intensified trace and a normal-intensity delayed
sweep trace on the crt. Increased oscilloscope intensity
may be required for viewing the delayed sweep.
8. Rotate the INTENSITY control and notethat it varies
the
intensity of the delaying sweep.
9. Rotate the CONTRAST adjustment for adequate
identification on the intensified portion of the delaying
sweep when alternating with Delayed sweep.
NOTE
When operating in the Intensified mode, the inten-
sified zone is controlled by the intensity of the test
oscilloscope instead of the 7B92A CONTRAST and
INTENSITY controls.
REV S, JUN 1978

10. Rotate the TRACE SEP control to vertically posi-
tion the delaying sweep trace with respect to the delayed
sweep trace. With the TRACE SEP control in the AL T OFF
position, only the Intensified sweep will be displayed.
11. Rotate the DELAY TIME MUL T dial and note that
the
amount of delay time before the intensified portion of
the display is controlled by the DELAY TIME MUL T dial.
12. Press the DLY'D Time/Division switch in for the
Delayed sweep mode. Note the delayed display with
sweep rate determined by the DLY'D Time/Division
switch.
13. Press and release the VARIABLE control. Rotate
the VARIABLE
control and note that the sweep rate
indicated bythe DLY'D
Time/Division switch can bevaried
to at least the sweep rate of the next adjacent position
(0.2 ms). The internal Time/Div Variable Selector must be
set
to the Delayed Sweep position. Return the VARIABLE
control
to the CAL position (knob in).
Triggering Functions
Main and Delayed Triggering. Perform the following
procedure to obtain a triggered alternate, normal, or
delayed sweep and demonstrate the function of the
related controls:
14. Perform the Setup Procedure. Connect the one-
kilohertz calibrator signal from the oscilloscope to the
amplifier plug-in unit input and adjust for about four
divisions of vertical display.
15. Set the DLY'D Time/Division switch and the
TIME/DIV OR DLY TIME switch to 1 ms, and press in the
DL
y'D Time/Division knob (normal sweep mode). Rotate
the MAIN TRIGGERING LEVEL
control for a stable
display.
16. Check that a stable display can be obtained with
the MAIN TRIGGERING
COUPLING switch set toAC, AC
HF REJ, and DC, for both the positive and negative
positions of the SLOPE
control (MAIN TRIGGERING
LEVEL control may be adjusted as necessary to obtain a
stable display). Remove all connections from the os-
cilloscope system.
17. Connect a 0.4 volt, one-kilohertz signal from the
oscilloscope calibrator to the amplifier plug-in unit and to
the MAIN TRIG IN connector. Setthe MAIN TRIGGERING
SOURCE switch
to EXT. Set the amplifier plug-in unit
volts/div switch for about four divisions of display. Check
that a stable display can be obtained
with the MAIN
TRIGGERING
COUPLING switch set to AC, AC HF REJ,
REV A, JUN 1978
Operating Instructions-7B92A
and DC, for both the positive and negativepositionsofthe
SLOPE control (MAIN TRIGGERING LEVEL control may
be adjusted as necessary for a stable display).
18. Change the MAIN TRIGGERING SOURCE switch
to EXT -:- 10. Settheoscilloscope calibrator for four voltsat
one kilohertz and adjustthe
amplifier plug-in unit volts/div
switch for about four divisions of display. Check that a
stable display can be obtained with the MAIN
TRIGGERING COUPLING switch set to AC, AC HF REJ,
and DC,
for both the positive and negativepositions ofthe
SLOPE control (MAIN TRIGGERING LEVEL control may
be adjusted
as necessary to obtain a stable display).
Remove all connections from the oscilloscope system.
19. Set the MAIN TRIGGERING COUPLING switch to
AC and SOURCE switch to INT. Connect a one-kilohertz
calibrator signal from the oscilloscope
to the amplifier
plug-in unit input and adjust for about four divisions of
display amplitude. Adjust the MAIN TRIGGERING LEVEL
control for astabledisplay. Set the MODEswitch to NORM
and check for a stable display. Change the MODE switch
to
AUTO and adjust the LEVEL control for afree-running
display. Changethe MODE switch to NORM and check for
no display.
20. Adjust the MAIN TRIGGERING LEVEL control for
a stable display. Change the MAIN TRIGGERING MODE
switch to SINGLE SWEEP. Press the RESET button and
check
for one sweep as the RESET button is pressed.
Removetheone-kilohertzSignal from the
amplifier plug-in
unitand presstheRESET button. Check for no display and
RESET
button light on. Connect the one-kilohertz signal
to the amplifier plug-in unit input and check for onesweep
as the signal is applied. Remove all connections from the
oscilloscope system.
21. Set the MAIN TRIGGERING MODE switch to
AUTO and SOURCE switch to AC. Turn the Delayed
Triggering LEVEL control fully clockwise to the RUNS
AFTER DELAY TIME position. Pull
out the DLY'D
Time/Division switch and rotate to 0.2 ms (Alternate
mode). Connect a 0.4 volt, one-kilohertz signal from the
oscilloscope calibrator to the amplifier plug-in unit input
and adjust for about two divisions of display amplitude.
Rotate the MAIN TRIGGERING LEVEL control for astable
intensified display. The INTENSITY control may need to
be adjusted to view the intensified display. Rotate the
DELAY
TIME MULT dial and note that the delay time
before the intensified portion of display is continuously
variable.
22. Set the Delayed Triggering SLOPE, COUPLING,
and SOURCE switches
to (+), AC, and INT. Rotate the
Delayed Triggering LEVEL control counterclockwise out
of the detent and adjust for a stable display. Rotate the
1-7

Operating Instructions-7B92A
DELAY TIME MUL T dial and note that the intensified
sweep does not start at the completion of the delay time
but waits for the next trigger pulse.
23. Check that a stable display can be obtained with
the Delayed Triggering COUPLING switch set to AC and
DC for both the (+) and (-) positions of the SLOPE switch
(Delayed Triggering LEVEL control may be adjusted as
necessary
for a stable display).
24. Change the Delayed Triggering SOURCE switch
to EXT. Connect a 0.4 volt, one-kilohertz signal from the
oscilloscope calibrator to the DLY'D TRIG IN connector.
Check that a stable display can be obtained with the
Delayed Triggering COUPLING switch set to AC and DC,
for both the (+) and (-) positions of the SLOPE switch
(Delayed Triggering LEVEL control may be adjusted as
necessary
for a stable delayed sweep display).
High-Frequency Synchronization. Perform the follow-
ing procedure to obtain a triggered alternate, normal, or
delayed sweep with a 100 megahertz to 500 megahertz
input signal:
NOTE
To check HF sync operation, a signal source fre-
quency between 100 megahertz and 500 megahertz
is required. If a 100 to 500 megahertz signal source is
not available, or if it is not desired to check the HF
sync operation, the last two steps of this procedure
may be deleted.
25. Change the MAIN TRIGGERING MODE switch to
HF SYNC. Connect a high-frequency signal source (100to
500 megahertz) to the amplifier plug-in unit input and
adjust
for four divisions of vertical deflection. Adjust the
TIME/DIV OR DLY TIME switch and DLY'D Time/Division
switch for about six cycles of display. Rotate the MAIN
TRIGGERING LEVEL control throughout its range and
note that the sweep is alternately stable, then free-
running, several
times during the rotation (stable display
indicates that the trigger-generator frequency is adjusted
to a sub-harmonic of the trigger signal frequency). Check
that stable displays can also be obtained with the MAIN
TRIGGERING COUPLING switch set to AC, AC LF REJ,
and DC
(MAIN TRIGGERING LEVEL control may be
adjusted, as necessary,
for a stable display).
26. Pullout the DL y'D Time/Division switch and rotate
it to the next fastest sweep rate from the setting of the
TIME/DIV OR DLY TIME switch (Alternate mode). When
the LEVEL
control is in the detent (RUNS AFTER DELAY
TIME) the display should be stable. Rotate the LEVEL
control counterclockwise out of the detentand adjust for a
1-8
stable display. Check that stable crt displays can be
obtained with the Delayed Triggering COUPLING switch
set to AC and DC. Disconnect the high-frequency signal
from the oscilloscope system.
GENERAL OPERATING INFORMATION
MAIN TRIGGERING
The MAIN TRIGGERING MODE, COUPLING, and
SOURCE pushbutton switches are arranged in a se-
quence which places the most-often used position at the
top of each series of pushbuttons. With this arrangement,
a stable
display can usually be obtained by pressing the
top pushbuttons: AUTO, AC, and INT. When an adequate
trigger signal is applied and the LEVEL control is set
correctly, the TRIG'D indicator will light. If the TRIG'D
indicator is not lit: (1) the LEVEL control is at a setting
outside the range of the trigger signal from the amplifier
plug-in unit, (2) the trigger signal is inadequate, or (3) the
trigger-signal frequency is below the lower frequency limit
of the COUPLI NG switch position. If the desired display is
not obtained with these pushbuttons, other selections
must be made. Refer to the following discussions or the
instruction manuals for the oscilloscope and amplifier
plug-in unit for more information.
Main Trigger Modes
The MODE pushbutton switch selects the mode in
which the main sweep is triggered.
AUTO. The AUTO pushbutton provides a triggered
display with the correct setting of the LEVEL control (see
Trigger Level discussion) whenever an adequate trigger
signal is applied. The TRIG'D indicator lights when the
display is triggered.
When the trigger repetition rate is outside the frequen-
cy range selected by the COUPLING switch or the trigger
signal is inadequate, the sweep free-runs at the sweep rate
indicated by the TIME/DIV OR DLY TIME switch (TRIG'D
indicator off). An adequate trigger signal ends the free-
running condition and a triggered display is presented.
When
the LEVEL control is at a setting outside the
amplitude range of the trigger Signal, the sweep also free
runs at
the sweep rate indicated by the TIME/DIV OR DLY
TIME switch. This type of free-running display can be
useful when it is desired to measure only the maximum
peak-to-peak amplitude of a signal without observing the
waveshape (such as in
bandwidth measurements).
HF SYNC. The HF SYNC pushbutton permits stable
displays of repetitive signals with only 0.5 division of
internal trigger signal (100 millivolts external signal)
required for frequencies between 100 megahertz and 500
megahertz.
REV C, JUN 1978

A triggered display is obtained when the LEVEL control
adjusts the frequency of the trigger generator to the
frequency or sub-harmonic of the trigger signal. Stable
displays
may be obtained several times between the limits
of the LEVEL control, depending on the amplitude and
frequency of the trigger signal. The LEVEL control should
be set for optimum display. (In the High-Frequency
Synchronization mode, the display is not necessarily
stable when the TRIG'D indicator is lit.)
When the LEVEL control is adjusted between sub-
harmonics of the trigger signal frequency, the trigger
repetition rate is below 100 megahertz or outside the
frequency rangeselected by the COUPLING switch, or the
trigger signal amplitude is inadequate, the sweep free-
runs at
the sweep rate determined by the TIME/DIV OR
DLY TIME switch.
NORM. The NORM pushbutton provides a triggered
display with the correct setting of the LEVEL control
whenever an adequate trigger signal is applied. The
TRIG'D indicator lights when the display is triggered.
The NORM
trigger mode must be used to produce
triggered displays with trigger repetition rates below
about 30 hertz. When the TRIG'D indicator is off, no trace
will be displayed.
SINGLE SWEEP. When the signal to be displayed is not
repetitive or varies in amplitude, waveshape, or repetition
rate, a conventional repetitive
type display may produce
an unstable presentation. A stable display can often be
obtained
under these circumstances by using the single-
sweep feature of this unit. The Single Sweep mode is also
useful
to photograph non-repetitive or unstable displays.
To obtain a single-sweep display of a repetitive signal,
first obtain the best possible display in the Norm mode.
Then,
without changing the other MAIN TRIGGERING
controls, press the SINGLE SWEEP-RESET pushbutton.
A single trace is presented each time the pushbutton is
pressed. Further sweeps
cannot be presented until the
SINGLE SWEEP-RESET pushbutton is pressed again. If
the displayed signal is a complex waveform composed of
pulses of varying amplitude, successive single-sweep
displays may not start at the same point on the waveform.
To avoid confusion due to the crt persistence, allow the
display to disappear before pressing the SINGLE SWEEP-
RESET
pushbutton again. At fast sweep rates, it may be
difficult to view the single-sweep display. The apparent
trace
intensity can be increased by reducing the ambient
light level or using a viewing hood as recommended in the
oscilloscope instruction manual.
REV A, JUN 1978
Operatin9 I nstructions-7B92A
When using the Single Sweep mode to photograph
waveforms, the graticule must be photographed separate-
ly in the normal manner to prevent over-exposing the film.
Be sure the camera system is well protected against stray
light, or operate the system in a darkened room. For
repetitive waveforms, press
the SINGLE SWEEP-RESET
pushbutton only once for each waveform unless the signal
is completely symmetrical. Otherwise, multiple
waveforms may appear on the film. For random signals,
the lens can be left open until the signal triggers the unit.
Further
information on photographic techniques is given
in
the appropriate camera instruction manual.
Main Trigger Coupling
The MAIN TRIGGERING COUPLING switches select
the method in which the trigger signal is connected to the
trigger circuits. Each position permits selection or rejec-
tion of some frequency components of the trigger signal
which trigger the sweep.
AC. The AC pushbutton blocks the dc component of
the trigger signal. Signals with low-frequency com-
ponents below about 30 hertz are attenuated. In general,
ac coupling can be used for mostapplications. However, if
the signal contains unwanted frequency components, or if
the sweep is to be triggered at a low repetition rate or dc
level, one of the other COUPLING switch positions will
provide a better display.
AC LF REJ. The AC LF REJ pushbutton rejects dc, and
attenuates
low-frequency trigger signals below about 30
kilohertz. Therefore, the sweep is triggered only by the
higher-frequency components of the trigger Signal. This
position is particularly useful for providing stable trigger-
ing if the trigger signal contains line-frequency com-
ponents. Also, the AC LF REJ position provides the best
Alternate mode vertical displays at fast sweep rates when
comparing two or more unrelated signals.
AC HF REJ. The AC HFREJ pushbutton passes all low-
frequency signals between about 30 hertz and 50
kilohertz. The dc component is rejected and signals
outside the above range are attenuated. When triggering
from complex waveforms, this position is useful to provide
a stable
display of the low-frequency components. AC HF
REJ
coupling should not be used when operating in the HF
SYNC triggering mode.
DC. The DC pushbutton can be used to provide stable
triggering from low-frequency Signals which would be
attenuated in
the other modes. It can also be used to
trigger the sweep when the trigger Signal reaches a dc
level set by the LEVEL control. When using internal
triggering, the setting of the amplifier plug-in unit position
control affects the triggeri ng point.
1-9
----------------------.-----

Operating Instructions-7B92A
Main Trigger Source
The MAIN TRIGGERING SOURCE pushbutton
switches select the source of the trigger signal that is
connected
to the main trigger circuits.
INT. The INT pushbutton connects the trigger signal
from the amplifier plug-in unit. Further selection of the
internal trigger signal may be provided by the amplifier
plug-in unit or oscilloscope; see the instruction manuals
for these instruments for more information. For most
applications, the internal source can be used. However,
some
applications require special triggering that cannot
be obtained in the INT position. In such cases, the LINE or
EXT positions of the SOURCE switches must be used.
LINE.
The LINE pushbutton connects a sample of the
power-line voltage from the oscilloscope to the trigger
circuit. Line triggering is useful when the input signal is
time-related (multiple or submultiple) to the line frequen-
cy. It is also useful for providing a stable display of a line-
frequency component in a complex waveform. Line
triggering cannot be used when operating in the HF sync
triggering mode.
EXT. The EXT
pushbutton connects the signal from the
MAIN TRIG IN connector to the trigger circuit. The
external signal must be time-related to the displayed
waveform for a stable display. An external trigger signal
can be used to provide a triggered display when the
internal signal is too low in amplitude for correct trigger-
ing, or contains signal components on which triggering is
not desired. It is also useful when signal
tracing in
amplifiers, phase-shift networks, wave-shaping circuits,
etc. The signal from a
single point in the circuit can be
connected to the MAIN TRIG IN connector through a
probe
or cable. The sweep is then triggered by the same
signal at all times and allows amplitude, time relationship,
or waveshape changes of signals at various points in the
circuit to be examined without resetting the MAIN
TRIGGERING controls.
EXT ";-10. The EXT..;- 10 pushbutton operatesthe same
as described for EXT except that the external signal is
attenuated.
Attenuation of high-amplitude external trigger
signals is desirable to increase the effective range of the
LEVEL control.
Input Impedance
The input impedance of the MAIN TRIG IN and DLY'D
TRIG IN connectors may be selected by the front-panel
TERM switch.
1-10
FRONT-PANEL IN - 1 MO. The 1 MO position is
suitable for most low- and medium-frequency
applications or when using a 10X probe. The 1 MO
position provides a high input impedance for minimum
loading on the trigger signal source.
FRONT-PANEL OUT -50 O. The 500 position is
recommended
for high-frequency applications requiring
maximum overal bandwidth. The 50 ohm termination
should be used when externally triggering from a 50 ohm
system.
Trigger Slope
The MAIN TRIGGERING SLOPE control (concentric
with the MAIN TRIGGERING LEVEL control) determines
whether the trigger circuit responds on the positive-going
or negative-going portion of the trigger signal. The trigger
slope cannot be selected when operating in the high-
frequency synchronization mode. When the SLOPE con-
trol is in the + (positive-going) position, the display starts
on
the positive-going portion of the waveform; in the -
(negative-going) position, the display starts on the
negative-going portion of the waveform (see Fig. 1-4).
When several cycles of a signal appear in
the display, the
setting of the SLOPE control is often unimportant.
However, if only a certain portion of a cycle is to be
displayed, correct setting of the SLOPE control is impor-
tant to provide a display which starts on the desired slope
of the input signal.
Trigger Level
The MAIN TRIGGERING LEVEL control determines
the voltage level on the trigger signal at which the sweep is
triggered when operating in the Auto, Norm, or Single
Sweep modes. When the LEVEL control is set in the +
region, the trigger circuit responds at amore positive point
on the trigger signal. When the LEVEL control is set in the
-region, the trigger circuit responds at a more negative
point on the trigger signal. Fig. 1-4 illustrates this effect
with different settings of the SLOPE switch.
To set the LEVEL control, first select the MAIN
TRIGGERING MODE, COUPLING, SOURCE, and
SLOPE. Then set the LEVEL control fully
counterclockwise and rotate it clockwise until the display
starts at the desired point. Less selection of the triggering
level is available as the trigger signal frequency exceeds
150 megahertz.
When
operating in the MAIN TRIGGERING HF sync
mode,
the LEVEL control synchronizes the trigger
generator frequency to a sub-harmonic of the trigger
signal frequency. Trigger slope and level cannot be
selected.
REV A, JUN 1978

CRT DISPLAY
OBTAINED WITH
SLOPE CONTROL
SET TO POSITIVE (+1
CRT DISPLAY
OBTAINED WITH
SLOPE CONTROL
SET TO NEGATIVE (-I
o
o
o
o
.........
.........
.... .....
.........
Operating Instructions-7B92A
----
POSI~IV~
i
I
-.-
- (+1 SLOPE I
I
f / \
/1\ !\
{ /\
V\ \ I \ \
fll
,\
\ \
\J
IV
\1
~ IV
--,--,_._.- -
POSITIVE
I
.--
(+1 SLOPE
/ I
Ij
/ f\
\ r If\
_.
~.
"
.\ 1 I \
HH
-\ \ \ \
\1 1\1 W \J IJ
NEGATIVE
f--- (-I SLOPE
),i(r
f\
'\
{
f\
--
.\ \.
.\ . \ I
J J \ I \ J \
\11
\
IV U ~ V
-.--~- --- -,_.-
NEGATIVE
. --
--
(-I SLOPE
/
--~
l
f\/
r\
[
1\
V
.\.
:\
1
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V J \ V J
1752·05A
Fig. 1-4. Effect of MAIN TRIGGERING LEVEL and SLOPE controls on crt display.
REV B, JUN 1978 1-11