Tektronix 7934 User manual

OPERATORS / Part No. 070-5879-00
TE
MANUAL
Product
Group
No.
42
7934
OSCILLOSCOPE
The following service instructions are for use by quali-
fied personnel only. To avoid personal injury, do not
perform any service other than that contained in op-
erating instructions unless you are qualified to do so.
Refer to Operators Safety Surnmary and Service
Summary prior to performing any service.
Please Check for
CHANGE INFORMATION
at the Rear of This Manual
First Printing MAY 1986 &
Tektronix.
COMMITTED TO EXCELLENCE

Copyright © 1986 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 @ are
registered trademarks of Tektronix, Inc.
Printed in U.S.A. Specification and price change
privileges are reserved.
Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077 Serial Number.

7934 Operators
TABLE OF CONTENTS
Page Page
LIST
OF
ILLUSTRATIONS...
0.0..c.
cece
eee
es
ii
Section2
OPERATING
INSTRUCTIONS
(cont)
LIST OF TABLES... ccc ccescececeeueeeees ii
OPERATORS SAFETY SUMMARY.............- iv TRIGGERING ............. 000 ce 2-8
7934 FEATURES 00... eee eee vi READOUT..... 000.0000 c cece es 2-8
BEAMFINDER. «00.0.0. 0.0s0s0eee 29
Section 1. GENERAL INFORMATION CALIBRATOR .. 0.0.0.0 ccece sees 29
INTRODUCTION . 2.00... 00eee eee 11 Z-AXIS INPUT. «seen 28
OPERATOR'S MANUAL........... 14 STORAGE OPERATION oso: 28
INSTRUCTION MANUAL 1 DETAILED OPERATING INFORMATION 2-14
INSTALLATION 22... 00. 0c eee cee 11 GRATICULE «sesso serene eee a4
INITIAL INSPECTION... 00002005 1-4 LIGHT FILTER. «wove eeeee eres at
OPERATING POWER INEORMATION 1.2 CONTROL ILLUMINATION. ........ 211
POWER CORD INFORMATION ..... 1-2 INTENSITY CONTROLS. ....... att
OPERATING VOLTAGE ........... 12 DISPLAY FOCUS | «1s. oe soos e 22
OPERATING TEMPERATURE ...... 4-2 ASTIGMATISM AND FOCUS
OPERATING POSITION ..........- 42 ADJUSTMENTS. «2-0 +s 2se sss a2
PACKAGING FOR SHIPMENT 42 BEAMFINDER. ..0..0.0..0-000005 2-12
SPECIFICATION .....0..0.0c0ec cues 1-4 TRACE ALIGNMENT ............ a12
ELECTRICAL CHARACTERISTICS... 1-4 READOUT DISPLAY... ...- 4... 242
ENVIRONMENTAL tat READOUT IDENTIFY ...........-. 2013
PHYSICAL ‘ie READOUT INTENSITY...........- 213
SYSTEM ELECTRICAL SPECIFICATION 1-13 READOUT MODES woos 218
PLUG-IN INCOMPATIBILITIES. ..... 4-14 READOUT OPERATION WITH
7934 OSCILLOSCOPE VERTICAL STORAGE |... s serene 218
SYSTEM SPECIFICATION. ...... 4-46 NORMAL READOUT MODE... .. 218
7934 OSCILLOSCOPE HORIZONTAL BISTABLE AND VAR PERSIST 2-14
SYSTEM SPECIFICATION. ...... 4-17 FAST BISTABLE AND FAST
SPECIAL PURPOSE PILUG-IN UNITS 1-18 VAR PERSIST ..... 0... 214
STANDARD ACCESSORIES ......... 4-19 PULSED READOUT MODE...... at4
RECOMMENDED ACCESSORIES... 4-49 BISTABLE .....-.... + 0-005 214
VAR PERSIST......0.0-.0-- 214
Section 2. OPERATING INSTRUCTIONS FAST BISTABLE ..«-- +. +++. etd
FAST VAR PERSIST. ........ 2-14
PLUG-IN UNITS. oo... eee eee 2-1 READOUT WITH SAVE STORAGE
INSTALLATION OF PLUG-IN UNITS . 2-1 MODE .....-..s. ss ceceaees 244
CONTROLS AND CONNECTORS ..... 2-1 SAVE WITH NORMAL
FRONT-PANEL COLOR CODING ... 2-1 READOUT............... 2-14
OPERATOR'S CHECKOUT SAVE WITH PULSED
PROCEDURE ................04. 2-1 READOUT........0.....- 2-14
TEST EQUIPMENT REQUIRED... 24 REDUCED SCAN MODE.......... 214
PRELIMINARY SET UP........... 26 STORAGE DISPLAY.............. 2-14
DISPLAY FOCUS «20... 0.0. ee eee 27 BISTABLE STORAGE .......... 244
TRACE ALIGNMENT ............. 27 VARIABLE PERSISTENCE
GRATICULE ILLUMINATION ....... 2.7 STORAGE... cscs cscs 244
CONTROL ILLUMINATION. 00.0... 2-7 FAST STORAGE .............. 2.45
VERTICAL DEFLECTION SYSTEM... 2-7 ERASE.............0seeee. 2-15
HORIZONTAL DEFLECTION SAVE MODE «0.0... cee ces eens 245
SYSTEM... cee eee eens 2-7 CARE OF STORAGE SCREEN ..... 2-16

7934 Operators
Page
Section 2 OPERATING INSTRUCTIONS (cont)
VERTICAL AND HORIZONTAL MODE
COMBINATIONS .............-, 2-16
VERTICAL MODES .............. 2-16
LEFT OR RIGHT .............. 2-16
ALTERNATE MODE............ 2-16
CHOPPED MODE ............. 2-17
ALGEBRAIC ADDITION......... 2-17
HORIZONTAL MODES............ 2-18
AOR Boo. eee eee 2-18
ALTERNATE MODE............ 2-18
CHOPPED MODE ............. 2-18
HORIZONTAL SELECTION ...... 2-18
VERTICAL TRACE SEPARATION ... 2-18
TRIGGER SOURCE .............. 2-18
CALIBRATOR OUTPUT ........... 2-19
VOLTAGE 2.66. eee 2-19
CURRENT .... 0... eee ee eee 2-19
REPETITION RATE ............ 2-19
WAVE SHAPE, .....--.- creas 2-19
SIGNAL OUTPUTS. ...........54- 2-19
+ SAWTOOTH OUT........... 2-19
+ GATE OUT... eee eee 2-19
VERTICAL SIGNAL ............ 2-19
PROBE POWER............... 2-20
DISPLAY PHOTOGRAPHY......... 2-20
INTENSITY MODULATION......... 2-20
REMOTE INPUT SIGNALS ........ 2-20
REMOTE RESET INPUT. ....... 2-24
REMOTE ERASE INPUT........ 2-21
REMOTE SAVE INPUT......... 2-21
TABLE OF CONTENTS (cont)
REMOTE STORAGE GATE INPUT 2-21
Page
Section 2 OPERATING INSTRUCTIONS (cont)
APPLICATIONS ......00.00 00002 2-21
VERTICAL AMPLIFIER PLUG-IN
UNITS. 00 cece ees 2-21
SINGLE-TRACE.............., 2-21
DUAL-TRACE. ...........00 008 2-21
THREE-TRACE ...........005. 2-21
FOQUR-TRACE .......0,..00005 2-21
TIME-BASE PLUG-IN UNITS....... 2-21
SAMPLING DISPLAYS...........- 2-22
SINGLE-TRACE SAMPLING ..... 2-22
DUAL-TRACE SAMPLING. ...... 2-22
X-¥ SAMPLING .. 0.0.0.0 22 eee 2-22
SPECIAL PURPOSE PLUG-IN UNITS 2-22
DIGITAL COUNTERS AND
MULTIMETER PLUG-IN UNITS 2-22
READOUT ACCESS PLUG-IN
UNIT. 22... 2-22
TRANSISTOR CURVE-TRACER
PLUG-IN UNIT. .........-0-. 2-22
SPECTRUM ANALYZER PLUG-IN
UNITS ©... 00... 2-23
X-Y OPERATION. ........0.- 0006 2-23
RASTER DISPLAYS........--.6-- 2-23
Section 3 INSTRUMENT OPTIONS
OPTION 02 1.2... cece eee eee 3-1
OPTION 03 066... cee eee eee 3-1
CHANGE INFORMATION

LIST OF ILLUSTRATIONS
Fig.
No. Page
FRONTISPIECE. 7934 FEATURES ....... vi
1-1. 7934 DIMENSIONAL DRAWING.......... 1-12
2-1. FRONT-PANEL CONTROLS, CONNEC-
TORS, AND INDICATORS. ..........+-. 2-2
2-2. REAR-PANEL CONTROLS AND
CONNECTORS. ..0 eee 2-4
2-3. DEFINITION OF GRATICULE MEASURE-
MENT LINES..........0.....0...0005- 2-11
2-4. LOCATION OF READOUT ON THE CRT
IDENTIFYING THE ORIGINATING PLUG-IN
AND CHANNEL... ...............000005 2-13
2-5. LOCATION OF READOUT ON THE CRT
WHEN REDUCED SCAN IS SELECTED... 2-13
LIST OF TABLES
Table
No. Page
1-1. POWER-CORD CONDUCTOR IDENTIFICA-
TION, Coc cece eee ence eee tne 1-2
1-2. POWER-CORD AND PLUG
IDENTIFICATION... 00.0... 0 eee eee 1-3
1-3. SHIPPING CARTON TEST STRENGTH.... 1-3
1-4, ELECTRICAL CHARACTERISTICS. ...... 1-4
1-5. ENVIRONMENTAL. ...............0005 1-11
1-6. PHYSICAL. 0. occ eee eee 1-12
1-7. PLUG-IN INCOMPATIBILITIES. .........- 4-14
1-8. 7934 OSCILLOSCOPE VERTICAL SYSTEM
SPECIFICATION, «0.000000 cece eee ene 1-16
1-9. 7934 OSCILLOSCOPE HORIZONTAL
SYSTEM SPECIFICATION. ............- 1-17
1-10. SPECIAL PURPOSE PLUG-IN UNITS..... 1-18
2-1. DISPLAY COMBINATIONS..........2565 2-16
3-1. OPTION INFORMATION LOCATOR....... 3-2
7934 Operators

7934 Operators
OPERATORS SAFETY INFORMATION
The following general safety information applies to all operators and service personnel. Specific warnings will be found
throughout the’ manual where they apply and should be followed in each instance.
WARNING statements identify conditions or practices which could result in personal injury or loss of life.
CAUTION statements identify conditions or practices which could result in damage to the equipment or other property.
The word DANGER on the equipment identifies areas of immediate hazard which could result in personal injury or loss of life.
The following safety symbols may appear on the equipment.
A CAUTION-——-Refer to manuai
¥ DANGER—High voltage
ee) Protective ground (earth) terminal
This instrument operates from a single-phase power source. it has a three-wire power cord and a two-pole, three-terminal
grounding-type plug. The voltage to ground (earth) from either pole of the power source must not exceed the maximum rated
operating voltage—250 volts.
Other warning symbols where they apply.
AC Power Source and Connection
Before making connection to the power source, determine that the instrument is adjusted to match the voltage of the power
source, and has a suitable two-pole, three-terminal grounding-type connector. Refer any changes to qualified service
personnel.
Grounding the Instrument
This instrument is safety class | equipment (IEC designation). All accessible conductive parts are directly connected through
the grounding conductor of the power cord to the grounding contact of the power connector.
The power-input plug must only be inserted in a mating receptacle with a grounding contact. Do not defeat the grounding
connection. Any interruption of the grounding connection can create an electric-shock hazard. Refer to qualified service
personnel for verification of adequate protective grounding system to which this instrument is to be connected.
For electric-shock protection, the grounding connection must be made before making connection to the instrument’s input or
output terminals.
Do Not Remove instrument Covers
To avoid electric-shock hazard, operating personnel must not remove the protective instrument covers. Component replace-
ment and internal adjustments must be made by qualified service personnel only.
Do Not Remove CRT implosion Shield
Do not remove the clear plastic implosion shield covering the ert face plate. This crt implosion shield provides protection to the
operator from crt implosion.

7934 Operators
Do Not Operate in Explosive Atmosphere
To avoid explosion, do not operate this instrument in an explosive atmosphere unless it has been certified for such operation.
Refer fuse replacement to qualified prersonnel only. To avoid fire hazard, use only the fuse specified in the parts list for your in-
strument and which is identical in the following respects:
Use the Proper Fuse
A. Type: Slow blow, fast blow, etc.
8. Voltage rating: 250 V, etc.
C. Current rating.
Operating-Power Considerations
To prevent damage to the instrument always check the LINE VOLTAGE SELECTOR switch, located on the rear of the
instrument, before connecting the instrument to the supply circuit.
Exercise Care with intensity Level
Crt phosphor damage can occur under adverse conditions. Avoid any condition where an extremely bright, sharply-focused
dot
exists on the ert. Also, remember that the light filter reduces the apparent light output from the crt.
Prevent Instrument Damage
Plug-in units should not be installed or removed without first turning the instrument power off, to prevent instrument damage.

7934 Operators
7934 FEATURES
The Tektronix 7934 Storage Oscilloscope is a solid-state, wide-bandwidth instrument designed for fast-writing speed
storage applications. Three display modes are available — Nonstore, Store, and Save; as well as four storage modes —
Bistable, Variable Persistence, Fast Bistable, and Fast Variable Persistence. In addition, the Reduced Scan feature increases
the stored-writing speed capability.
The 7934 accepts up to four Tektronix 7000-series plug-in units. The flexibility of the plug-in feature and variety of plug-in
units available allows the system to be used for many measurement applications. The left pair of plug-in compartments are
reserved for vertical deflection and the right pair are reserved for horizontal deflection. Electronic switching between each pair
produces multi-trace vertical and/or horizontal displays.
Power supply voltages are closely regulated to maintain instrument performance when variations in line voltage, line
frequency, or plug-in load occur. The light-weight, high-efficiency power supply operates from 115- or 230-volt nominal supply
sources (50 to 400 hertz).

Section 1—7934 Operators
GENERAL INFORMATION
INTRODUCTION
Operator’s Manual
The Operator's Manual is divided into three main
sections.
Section 1 — General information contains instrument
description, electrical specifications, environmental charac-
teristics, standard and recommended accessories, installa-
tion, and instructions for packaging for shipment.
Section 2 — Operating Instructions contains informa-
tion relative to operating and checking the instrument
operation.
. Section 3 — Instrument Options contains a description
*. of available options and gives the location of the associated
information for those options.
Instruction Manual
The Instruction Manual contains both operating and ser-
vicing information for the 7934 Storage Oscilloscope. Sec-
tions 1 through 3 of the Instruction Manual contain the same
information as Sections 1 through 3 of the Operator's Man-
ual; the remaining sections of the Instruction Manual are as
follows:
The additional sections of the Instruction Manual con-
tain servicing instructions. These servicing instruc-
tions are for use by qualified service personnel only.
To avoid electric shock or other personal injury, do
not perform any servicing other than that described in
the Operating instructions unless you are qualified.
Section 4 — Theory of Operation contains basic and
general circuit analysis to help in understanding the opera-
tion of the instrument and that may be useful for servicing
the instrument.
Section 5 —~ Maintenance describes routine and correc-
tive maintenance procedures with detailed instructions for
replacing assemblies, subassemblies, and individual compo-
nents.
Section 6 — Checks and Adjustments contains proce-
dures to check the operational performance and electrical
characteristics of the instrument. Procedures also include
methods for adjustment of the instrument to meet
specifications.
Section 7 — Replaceable Electrical Parts contains in-
formation necessary to order replaceable paris and assem-
blies related to the electrical functions of the instrument.
Section 8 — Diagrams and Circuit Board Iliustrations
includes detailed circuit schematics, locations of assembled
boards within the instrument, voltage and waveform in-
formation, circuit board and schematic component locators,
and locations of adjustments to aid in performing the adjust-
ment procedure.
Section 9 — Replaceable Mechanical Paris includes
information necessary to order replaceable mechanical
parts and shows exploded drawings which identify
assemblies.
INSTALLATION
initial Inspection
This instrument was inspected both mechanically and
electrically before shipment. it should be free of mars or
scratches and should meet or exceed all electrical specifica-
tions. To confirm this, inspect the instrument for physical
damage incurred in transit and test the electrical perfor-
mance by following the Operator's Checkout Procedure in
the Operating Instructions, Section 2, and the Performance
Check given in Checks and Adjustments, Section 6 of the
instruction Manual. If there is damage or deficiency, contact
your local Tektronix Field Office or representative.
1-1

General Information—7934 Operators
Operating Power Information
This Instrument can be operated from either a 115-volt or
230-volt nominal supply source, 48 to 440 hertz.
CAUTION
To prevent darnage to the instrument, always check
the setting of the LINE VOLTAGE SELECTOR switch
located on the rear panel of the instrument before
connecting the instrument to the supply circuit.
WARNING
AC POWER SOURCE AND CONNECTION, This in-
sirument operates from a single-phase power source.
it has a three-wire power cord and two-pole, three-
terminal grounding-type plug. The voltage to ground
(earth) from either pole of the power source must not
exceed the maximum rated operating voltage — 250
volts.
GROUNDING. This instrument is safety class | equip-
ment (IEC designation). All accessible conductive
parts are directly connected through the grounding
conductor of the power cord to the grounding contact
of the power plug.
The power input plug must only be inserted in a mat-
ing receptacle with a grounding contact. Do not defeat
the grounding connection. Any interruption of the
grounding connection can create an electric shock
hazard.
For electric shock protection, the grounding connec-
tion must be made before making connection to the
instrument's input or output terminals.
Power Cord Information
A power cord with the appropriate plug configuration is
supplied with the 7934. If you need to change the power
plug, refer to Table 1-1 and Table 1-2 for power-cord and
plug identification information.
Table 1-1
POWER-CORD CONDUCTOR IDENTIFICATION
Conductor Color Alternate Color
Ungrounded (Line) Brown Black
Grounded (Neutral) Blue White
Grounded (Earthing) Green-Yellow Green-Yellow
Operating Voltage
The LINE VOLTAGE SELECTOR switch (located on the
rear panel) allows selection of 115-volt or 230-volt nominal
line voltage operation. To convert from 115-volt to 230-volt
operation, change the power cord and plug to match the
power-source receptacle. Then use a smail screwdriver to
move the LINE VOLTAGE SELECTOR switch to the desired
range.
Operating Temperature
The 7934 can be operated where the ambient air tem-
perature is between 0 and +50° C. This instrument can be
stored in ambient temperatures from —55 to +75° C. After
storage at temperatures outside the operating limits, allow
the chassis temperature to reach a safe operating limit be-
fore applying power.
The 7934 is cooled by air drawn in through holes in the
top, side, and bottom panels and blown out through the fan
exhaust. To ensure proper cooling of the instrument, main-
tain the clearance provided by the feet on the bottom and
allow at least two inches clearance (more if possibie) at the
top, sides, and rear of the instrument.
Operating Position
A bail-type stand, mounted on the bottom of the instru-
ment, permits the instrument to be tited up about 10° for
more convenient crt viewing.
PACKAGING FOR SHIPMENT
lf the 7934 is to be shipped for long distances by com-
tnercial transportation, it is recommended that the instru-
ment be repackaged in the original manner. The carton and
packaging material in which your instrument was shipped
should be saved and used for this purpose.
Also, if this instrument is to be shipped to a Tektronix
Service Center for service or repair, attach a tag to the in-
strument showing the following: Owner of the Instrument
(with address), name of a person at your firm who can be
contacted if required, complete instrument type and serial
number, and a detailed description of the service required.
if the original packaging is unfit for use or is not available,
package the instrument as follows:
1. Obtain a corrugated cardboard shipping carton having
inside dimensions at least six inches greater than the instru-
ment dimensions. Refer to Table 1-3 for carton test strength
requirements.

General information--7934 Operators
TABLE 1-2
Power-Cord and Plug Identification information
Plug Nominal Reference
tion #
Configuration Usage Line-Voltage (AC) Standards Sption
North American IANS} C7344
420V/15A 120 V NEMA 5-15-P Standard
SIEC 83
Universal Euro “CEE (7), ILIV,VE
220V/6-16A 220V SEC 83 AI
UK °BS 1363
240V/6-13A 240'V SIEC 83 A2
Australian 240 V *aS C112 Aa
240V/6-10A
1
wp . ANSI ©73.20
North American 2
A 240 V NEMA 6-15-P A4
240V/15A SEC 83
Switzerland 200 V SEV AS
220V/8-10A
1ANS!—American National Standards Institute
2NEMA—National Electrical Manufacturer's Association
JEC—international Electrotechnical Commission
4CEE—Iinternational Commission on Rules for the Approval
Electrical Equipment
2. Enclose the instrument with polyethylene sheeting or
equivalent to protect the finish of the instrument.
3. Cushion the instrument on all sides by tightly packing
dunnage or urethane foam between the carton and the in-
strument, allowing three inches on each side.
4. Seal the carton with shipping tape or with an industrial
stapler.
5. Mark the address of the Tektronix Service Center and
your return address on the carton in one or more prominent
locations.
5BS—British Standards institution
®AS—-Siandards Association of Australia
7SEV-—Schweizevischer Elektrotechischer Verein
Table 1-3
SHIPPING CARTON TEST STRENGTH
Gross Weight (pounds) Carton Test Strength
{pounds}
0-10 200
10 - 30 275
30
- 120 375
120 - 140 500
140 - 160 600
1-3

General information—7934 Operators
SPECIFICATION
The electrical characteristics listed in Table 1-4 apply at
ambient temperatures between 0 and +50° C, unless oth-
erwise stated, when the following conditions are met: 1) The
instrument was adjusted at an ambient temperature be-
tween +20 and +30° C; 2) The instrument is allowed a 30-
minute warm-up period; 3) The instrument is operated in an
environment that meets the limits described in Table 1-5. All
specifications are valid in both Full Scan and Reduced Scan
modes unless stated otherwise.
Any applicable conditions not listed above are expressly
stated as part of the appropriate characteristic.
Table 1-4
ELECTRICAL CHARACTERISTICS
Characteristic
Performance Requirement
VERTICAL SYSTEM
Deflection Factor
Compatible with all 7000-series plug-in units.
Difference Between Vertical 1% or less.
Compartments
Low-Frequency Linearity
0.1 division or less compression of a center-screen two-division display
positioned anywhere verticaily within graticule area.
Bandwidth Varies with plug-in unit selected. See 7934 Oscilloscope Vertical System
Specification, Table 1-8.
\solation Between Vertical Compartments
All Vertical Modes
Delay Line
At least 100:1 from dc to 150 MHz and at least 30:1 from 150 MHz to 500 MHz.
Permits viewing the leading edge of triggering signal.
NOTE
Not all 7B50-series time-base units can display the
leading edge of the trigger signal in the 7934. Refer to
the Tektronix Products Catalog under the specific
time-base unit for recommended mainframe use.
Vertical Display Modes
Selected by front-pane! VERTICAL MODE switch.
LEFT Signal from left vertical plug-in unit displayed.
ALT Display alternates between left and right vertical plug-in units.
ADD Display is algebraic sum of left and right vertical plug-in units.
CHOP Display chops between left and right vertical plug-in units.
RIGHT Signal from right vertical plug-in unit displayed.
Chopped Mode Repetition Rate 1 MHz within 20%.
Vertical Trace Separation
1-4
Positions B trace at least four divisions above and below A trace when 7934
operates in dual-sweep mode.

General Information—7934 Operators
Table 1-4 (cont)
Characteristic
Performance Requirement
HORIZONTAL SYSTEM
Deflection Factor
Compatible with ali 7000-series plug-in units.
Difference Between Horizontal
Compartments
Fastest Calibrated Sweep Rate
Horizontal Dispiay Mode
1% or less.
0.5 nanosecond/division.
Selected by front-panel HORIZONTAL MODE switch.
A A horizontal plug-in unit displayed.
ALT Display alternates between A and B horizontal plug-in units.
CHOP Display chops between A and B horizontal plug-in units.
B B horizontal plug-in unit displayed.
Chopped Mode Repetition Rate
200 kHz within 20%.
Phase Shift Between Vertical and
Horizontal Deflection Systems
2° or less from de to at least 35 kHz.
With Option 02 (B HORIZ
Compartment Only)
2° or jess from de to 1 MHz.
Bandwidth (7934 Horizontal System Only
with 10 Division Reference)
From dc to at least 1 MHz.
With Option 02 (B HORIZ
Compartment Only)
From dc to at least 1 MHz.
TRIGGER SYSTEM
A and B TRIGGER SOURCE
Selected by front-panel TRIGGER SOURCE switches.
VERT MODE From vertical plug-in unit selected by VERTICAL MODE switch; CHOP mode
signals are added algebraically.
LEFT VERT From left vertical plug-in unit only.
RIGHT VERT From right vertical plug-in unit only.
1-5

General information-—~7934 Operators
Table 1-4 (cont)
Characteristic Performance Requirement
CALIBRATOR
Waveshape Square wave.
Polarity Positive going with baseline near zero volts.
Source Impedance
Approximately 450 ohms.
Output Voltage
Selected by front-panel CALIBRATOR switch.
into 100 Kilohms or Greater
40 mV, 0.4 V, 4 V.
Into 50 Ohms Amv, 40 mV, 0.4 V.
Output Current 40 mA available through CALIBRATOR output with optional BNC-to-Current
Loop adapter. CALIBRATOR switch must be set to 4 V for calibrated current
output.
Amplitude Accuracy (P-P Voltage) Within 1%.
Repetition Rate 1 kHz within 0.25%.
Duty Factor
49.8 to 50.2%,
Rise Time and Fail Time 250 nanoseconds or less into 100 pF or less.
SIGNAL OUTPUTS
Sawtooth Output Selected by internal Sweep Selector jumper.
Source A HORIZ time-base unit or B HORIZ time-base unit.
A Sweep Derived from A HORIZ time-base sweep.
B Sweep Derived from B HORIZ time-base sweep.
Polarity Positive going with baseline at 0 V, within 1 V, into 1 Megohm.
Output Voltage
Rate of Rise
Into 50 ohms
50 mV/unit of time selected by time-base unit time/division switch, within 15%:
100 ns/division sweep rate maximum.
Into 1 Megohm 1 Viunit of time selected by time-base unit time/division switch, within 10%;
1 us/division sweep rate maximum.
Output Resistance Approximately 950 chms.
1-6

General information—-7934 Operators
Table 1-4 (cont)
Characteristic Performance Requirement
Gate Output
Selected by internal Gate Selector jumper.
Source A HORIZ time-base unit or B HORIZ time-base unit.
A Gate Derived from the A HORIZ time-base unit main gate.
B Gate Derived from the B HORIZ time-base unit main gate.
Diy'd Gate Derived from the A HORIZ time-base unit delayed gate.
Polarity
A or B Gate Positive going with baseline at 0 V, within 1.0 V, into 1 Megohm.
A Dly’d Gate Positive level when A time-base delayed sweep or B sweep is enabled. O V,
within
1.0 V, into 1 Megohnm when sweeps are disabled. Output is always positive
when no plug-in is used or plug-in does not provide delayed gate.
Output Voltage
Into 50 Ohms 0.5 V within 10%,
Into 1 Megohm 10 V within 10% (up to 1 us/division sweep rate).
Rise Time Into 50 ohms
20 nanoseconds or less.
Output Resistance Approximately 950 ohms.
Vertical Signal Out
Selected by B TRIGGER SOURCE switch.
Source
Same as B TRIGGER SOURCE.
Output Voltage
into 50 Ohms 25 mV/division of vertical deflection within 25%.
into 1 Megohm
0.5 V/division of vertical deflection within 25%.
Bandwidth into 50 Ohms
Varies with vertical plug-in selected; see 7934 Oscilloscope Vertical System
Specification, Table 1-8.
DC Centering
0 V, within 1 V, into 1 megohm.
Aberrations 25% or less p-p within 2 nanoseconds of step.
Output Resistance Approximately 950 ohms.
Z-AXIS SYSTEM
External Z-Axis input
Polarity and Sensitivity
Positive 2 V provides complete blanking from maximum-intensity condition;
negative 2 V provides complete unblanking from minimum-intensity condition.
Low-Frequency Response
Te de.
Input Resistance
Approximately 470 ohms.
Maximum Input Voltage
Within 15 V (de plus peak ac).
Maximum Repetition Rate
1 MHz.

General Information—7934 Operators
Tabie 1-4 (cont)
Characteristic
Performance Requirement
READOUT DISPLAY
Readout Modes
Selected by front-panel READOUT controi.
Free Run Readout (READOUT
Control in Variable Area)
Storage Mode
STORE OFF
Readout continuously displayed.
BISTABLE or VAR PERSIST Readout continuously displayed, except turns off during erase cycie.
FAST BISTABLE or FAST VAR
Readout continuously displayed, except turns off at beginning of erase cycle or at
PERSIST initiation of single-sweep reset until end of transfer cycle. Also, turns off when
displayed time base operates in other than single-sweep mode and MULT!
TRACE DELAY control is not in detent.
SAVE Readout displayed for approximately one second after save mode is entered,
then turns off.
Pulsed Readout (READOUT Control in
PULSED Detent)
Storage Mode
STORE OFF One frame of readout is provided at end of displayed sweep.
BISTABLE Readout continuously displayed except turns off from beginning of erase cycle
until end of first displayed sweep.
VAR PERSIST One frame of readout is provided at the end of displayed sweep. Erase cycle
inhibits readout display.
FAST BISTABLE
Readout continuously displayed except turns off at beginning of erase cycle, or at
initiation of single-sweep reset until end of transfer cycle. Also, turns off when
displayed time base operates in other than single-sweep mode and when MULTI
TRACE DELAY conirol is not in detent.
FAST VAR PERSIST
One frame of readout is provided at the end of transfer cycle; turns off when
displayed time base operates in other than single-sweep mode and when the
MULTI TRACE DELAY control is not in detent.
SAVE
BISTABLE or FAST Readout dispiayed for approximately one second after SAVE mode is entered,
BISTABLE then turns off.
VAR PERSIST Allows one frame of readout to be displayed at end of displayed sweep.
FAST VAR PERSIST
Allows one frame of readout to be displayed at end of transfer cycle.
Character Height
Full Scan
0.35 to 0.5 division,
Reduced Scan
At least 0.2 division.
1-8

General information--7934 Operators
Table 1-4 (cont)
Characteristic Performance Requirement
DISPLAY
Cathode Ray Tube
Graticule
Type internal; illuminated with variable edge lighting.
Area
Full Scan 8 x 10 divisions; 0.9 cm/division.
Reduced Scan 8 x 10 divisions; 0.45 cm/division, centered on faceplate.
Phosphor P31.
Stored Vertical and Horizontal Resolution
in VAR PERSIST and FAST VAR
PERSIST (Full Scan Only)
10 lines/division.
High Voltage — Overall Accelerating
Voltage
Approximately 10 kV (approximately 12 kV in Reduced Scan).
Geometry
Within 0.1 division of vertical and horizontal graticule lines.
Beamfinder
Actuating BEAMFINDER limits display to within graticule area.
STORAGE
Stored Writing Speed
Full Scan (Center 6 x 8 Divisions)
FAST VAR PERSIST
300 divisions/microsecond (270 cm/ys).
FAST BISTABLE
50 divisions/microsecond (45 cm/us).
VAR PERSIST
2 divisions/microsecond (1.8 cm/us).
BISTABLE
0.03 division/microsecond (0.027 cm/us).
Reduced Scan (Center 8 x 10
Divisions)
FAST VAR PERSIST
8,800 divisions/microsecond (4,000 cm/ys).
FAST BISTABLE
776 divisions/microsecond (350 cm/xs).
VAR PERSIST
12 divisions/microsecond (5.4 cm/xs).
BISTABLE
0.2 division/microsecond {0.09 cm/us).
Stored Save Time (SAVE Mode)
BISTABLE and FAST BISTABLE
At least 30 minutes (SAVE INTENSITY at minimum).
Stored View Time
VAR PERSIST and FAST VAR
PERSIST
30 seconds or more at maximum persistence.

Generai information—7934 Operators
Table 1-4 (cont)
Characteristic
Performance Requirement
Auto Erase View Time
Minimum
Less than 1 second.
Maxirnum
Greater than 10 seconds.
Mukti Trace Delay Time
Minimum
Less than 1 second.
Maximum
Greater than 4 seconds.
REAR-PANEL CONNECTORS AND SWITCHES
CONTROL ILLUMINATION
High, mediurn, and off (three position switch located on rear panel of power
supply).
PROBE POWER
Two connectors for compatible Tektronix probes.
REMOTE RESET INPUT
Input to reset single-sweep function of time-base units installed in A and B
HORIZ compartments (compatible time-base units only). High-to-low transition
resets sweep.
REMOTE STORAGE GATE INPUT
Allows remote operation of high-speed transfer. Low-to-high transition enables
High Speed Target to receive information to be stored. High-to-low transition
initiates transfer from high-speed target to storage target.
REMOTE ERASE INPUT
Allows remote erasure of stored display. High-to-low transition initiates an erase
cycle when in a storage mode.
REMOTE SAVE INPUT
Allows remote control of Save mode. High state allows control from front panel.
Low state holds storage circuitry in Save mode when in storage mode.
POWER SOURCE
Voltage Range (ac, rms)
Selected by rear-panel LINE VOLTAGE SELECTOR switch.
115 V Nominal
From 90 V to 132 V.
230 V Nominal
From 180 V to 250 V
Line Frequency
From 48 to 440 Hz.
Maximum Power Consumption
230 Watts.
Maximum Current
90 V Line 3.5 amps at 60 Hz.
180 V Line 1.8 amps at 60 Hz.
Line Fuse 4 amp fast biow.

General Information—7934 Operators
Table 1-5
ENVIRONMENTAL
Characteristic Information
NOTE
This instrument will meet the electrical characteristics given in the Performance
Requirement column of Table 1-4 over the following environmental limits.
Temperature Range
Operating 0 to +50° C.
Nonoperating —55 to +75° C.
Altitude
Operating 5 kilometers (15,000 feet).
Nonoperating Test limit 15 kilometers (50,000 feet).
EMC (Electrornagnetic Compatibility) Meets requirements of MIL-STD-461A, when tested in accordance with the
following test methods of MIL-STD-462.
All Instruments CS-01, CS-06, and CE-03 Part 4 Curve 1.
Option 03
NOTE
The EM! mesh filter must be installed and any unused plug-in
compartments must be covered with a blank plug-in panel (EMC
shieided) in order to meet EMC specifications. See instrument Op-
tions section for additional information.
FCC Part 15 Subpart J Class A, VDE 0871 Class B, RSO1, RSO3 (limited to
1 GHz), REO2 Part 7, REO2 Part 4.
Vibration Tested to MIL-T-28800C, Section 4.5.5.3.1 Type III, Class 5, Style F.
Shock
Tested to MIL-T-28800C, Section 4.5.5.4.1, Type Ill, Class 5, Style F.
Bench Handling Tested to MIL-T-28800C, Section 4.5.5.4.3, Type Ill, Class 5, Style F.
Transportation Qualified under National Safe Transit Committee test procedure 1A, Category Il.
Bounce NSTA, Project 1A-B-1.
Drop (Packaged Product) NSTA, Project 1A-B-2.
Humidity Tested to MIL-STD-810C, Method 507-1, Procedure IV, modified as specified in
Mil-T-28800C, paragraph 4.5.5.1.12, except: 90 - 95% relative humidity (steps 5
and 6); operating tests at 50° C (step 5, second cycle).
Electrostatic Discharge
Operating
0 to 15 kV with no performance degradation.
Nonoperating 0 to 20 kV with no instrument damage.
1-11

General information—-7934 Operators
Table 1-6
PHYSICAL
Characteristic
information
Ventilation
Safe operating temperature maintained by dc fan.
Warm-up Time
30 minutes for rated accuracy.
Finish Anodized front and rear panel with biue-vinyl painted aluminum cabinet.
Overall Dimensions Measured at maximum points; see Fig. 1-1 for dimensional drawing.
Height 34.5 cm (13.6 inches).
Width 30.5 cm (12.0 inches).
Length 62.25 cm (24.5 inches).
Net Weight (instrument Only) 17.2 kg (38.0 pounds).
62.25 308
= i=!
Oa 9
SES
1 13.6 S 2
34.5 a =o —o
a
NOTE: DIMENSIONS ARE GIVEN WITH
TOP FIGURE IN INCHES AND BOTTOM
FIGURE IN CENTIMETERS,
5879-1
1-12
Figure 1-1. 7934 dimensional drawing.