Tektronix 2335 User manual

Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077
070-4115-00

Tektronix
COMMITT D TO XC LL NC
PLEASE CHECK FOR CHANGE
INFORMATION AT THE REAR
OF THIS MANUAL-
INSTRUCTION MANUAL
First Printing D C 1980
Serial Number
_ ______________________Revised JUL 1981

Copyright © 1980 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.
T KTRONIX, T K, SCOP -MOBIL , and I l f are reg
istered trademarks of Tektronix, Inc. T L QUIPM NT is
a registered trademark of Tektronix U.K. Limited.
Printed in U.S.A. Specification and price change
privileges are reserved.

IA fc S L f c U h U U 1 M I t I M I b
Page
LIST OF ILLUSTRATIONS.................................................iii
LIST OF TABL S ................................................................... v
OP RATORS SAF TY SUMMARY....................................vi
INTRODUCTION ................................................................... 1
PR PARATION FOR US .................................................... 2
LIN VOLTAG S L CTION ....................................... 2
LIN FUS ........................................................................4
POW R CORD...................................................................5
CONTROLS, CONN CTORS, AND INDICATORS .......... 6
POW R AND DISPLAY....................................................6
V RTICAL ........................................................................ 7
HORIZONTAL ................................................................. 10
A TR IG G R ....................................................................12
R AR PAN L ................................................................. 15
Page
OP RATING CONSID RATIONS.....................................17
GRATICUL ....................................................................17
GROUNDING.................................................................17
SIGNAL CONN CTIONS ...................................... 18
INPUT COUPLING CAPACITOR
PR CHARGING...............................................................18
INSTRUM NT COOLING ............................................ 19
INSTRUM NT FAMILIARIZATION................................20
INTRODUCTION............................................................20
QUIPM NT R QUIR D ............................................ 20
NORMAL SW P DISPLAY..........................................21
DISPLAYING A SIGNAI ........... . ............................... .22
OP RATOR'S CH CKS AND ADJUSTM NTS .............. 32
INTRODUCTION............................................................32
TRAC ROTATION.......................................................32
PROB COMP NSATION . ........................ .33
ASTIGMATISM .............................................................. 34
V RTICAL GAIN CH CK ............................................ 35
2335 Operators

TABLE OF CONTENTS ( ont)
Page
BASIC APPLICATIONS.......................................................36
NOND LAY D M ASUR M NTS..............................36
AC Peak-to-Peak Voltage .......................................... 36
Instantaneous DC Voltage .......................................... 38
Algebraic A ddition .................................................... 39
Common-Mode Rejection .......................................... 41
Time Duration............................................................42
Frequency....................................................................44
Rise T im e ................................................................... 44
Time Difference Between Two
Time-Related Pulses .................................................... 46
Phase Difference ......................................................... 47
Amplitude Comparison ............................................... 49
Time Comparison.......................................................51
D LAY D-SW P MAGNIFICATION.........................53
Magnified Sweep Runs After Delay ........................... 53
Pulse Jitter Time Measurement...................................55
Page
* D LAY D-SW P TIM M ASUR M NTS .............. 55
Time Duration ................................................ .56
Rise T im e ................................. 57
Time Difference Between Repetitive Pulses .......... 59
Time Difference Between Two
Time-Related Pulses .................................................... 61
OPTIONS ......................................... 63
OPTION 0 3 ...................................................................... 63
SP CIFICATION ................................................................. 64
ACC SSORI S......................................................................87
STANDARD ACC SSORI S INCLUD D ................. 87
OPTIONAL POW R CORDS ......................................... 87
APP NDIX A..........................................................................88
CHANG INFORMATION
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ii 2335 Operators R V JUL 1981

viii
.3
.5
.7
,8
10
12
16
17
23
34
35
37
39
41
42
43
45
LIST OF ILLUSTRATIONS
The 2335 Oscilloscope........................................................................
LIN VOLTAG S L CTOR switch, line fuse, and power cord .
Optional power cords ..................... .. ..................................................
Power and display controls and indicators .................................... ..
Vertical controls, connectors, and indicators and calibrator output
Horizontal controls and indicator......................................................
Trigger controls, connector, and indicator ............... ..
Rear-panel connectors........................................................................
Graticule measurement markings ....................... .. ............................
Initial setup for instrument familiarization procedure ....................
Probe compensation................ .. ............ .. . ........................................
Vertical display accuracy...................................................................
Peak-to-peak waveform voltage ........................................................
Instantaneous voltage measurement.................................................
Algebraic addition .............................................. .. ..............................
Common-mode rejection .......................... .. ........................................
Time duration. . . ............ .. .................... .. ...........................................
Rise time ................................. .. ..........................................................
2335 Operators

LIST OF ILLUSTRATIONS ( ont)
Figure Pase
18 Time difference between two time-related pulses ......................... . ........................................ .47
19 Phase difference......................................................................................................................................49
20 High-resolution phase difference ......................... 49
21 Delayed-sweep magnification ................................................................................. 54
22 Pulse jitte r...................................................................................... 55
23 Time duration using delayed sweep........................................................................................................56
24 B D LAY TIM POSITION control settings.................................................. 57
25 Rise time, differential time method. ............................................................................................58
26 Time difference between repetitive pulses...........................................................................................60
27 Time difference between two time-related pulses.......................................................................... . .62
iv 2335 Operators

LIST OF TABLES
Table Page
1 Line Voltage and Fuse Selection. . .................................................... 4
2 Option 03 Line Voltage and Fuse Selection . ............................................................ 4
3 quipment Required for Instrument Familiarization Procedure.........................................................21
4 lectrical Characteristics .......................... ....... ......................................................................................65
5 nvironmental Characteristics............................................................................ 83
6 Physical Characteristics............................................................. 85
7 Option lectrical Characteristics .............................. .... 86
2335 Operators V

OPERATORS SAFETY SUMMARY
The general safety information in this part of the summary is for both operating and servicing personnel. Specific warnings
and cautions will be found throughout the manual where they apply and do not appear in this summary.
Terms in This Manual Symbols in This Manual
CAUTION statements identify conditions or practices
that couid result in damage to the equipment or other
property.
WARNING statements identify conditions or practices
that could result in personal injury or loss of life.
A This symbol indicates where applicable
/ ! \ cautionary or other information is to be
found. For maximum input voltage see
Table 4.
Symbols as Marked on quipment
Terms as Marked on quipment
CAUTION indicates a personal injury hazard not
immediately accessible as one reads the markings, or a
DANG R — High voltage.
hazard to property, including the equipment itself. Protective ground {earth} terminal.
DANG R indicates a personal injury hazard immedi
ately accessible as one reads the marking. / V ATT NTION — Refer to manual.
VI 2335 Operators

Power Source
This product is intended to operate from a power
source that does not apply more than 250 volts rms
between the supply conductors or between either supply
conductor and ground, A protective ground connection
by way of the grounding conductor in the power cord is
essential for safe operation.
Grounding the Product
This product is grounded through the grounding con
ductor of the power cord. To avoid electrical shock, plug
the power cord into a properly wired receptable before
connecting to the product input or output terminals. A
protective ground connection by way of the grounding
conductor in the power cord is essential for safe operation.
Danger Arising From Loss of Ground
Upon loss of the protective-ground connection, all
accessible conductive parts (including knobs and controls
that may appear to be insulating) can render an electric
shock.
Use the Proper Power Cord
Use only the power cord and connector specified for
your product.
Use only a power cord that is in good condition.
For detailed information on power cords and con
nectors see Figure 2.
Use the Proper Fuse
To avoid fire hazard, use only a fuse of the correct type,
voltage rating and current rating as specified in the parts
list for your product.
Do Not Operate in xplosive Atmospheres
To avoid explosion, do not operate this product in
an explosive atmosphere unless it has been specifically
certified for such operation.
Do Not Remove Covers or Panels
To avoid personal injury, do not remove the product
covers or panels. Do not operate the product without the
covers and panels properly installed.
vii
2335 Operators

INTRODUCTION
The T KTRONIX 2335 Oscilloscope is a rugged, light
weight, dual-channel, 100-l\/IHz instrument having a com
pact crt that provides a sharply defined trace. Its vertical
system supplies calibrated deflection factors from 5 mV per
division to 5 V per division. Sensitivity can be increased to
at least 2 mV per division by the variable VOLTS/DIV
VAR control. Trigger circuits enable stable triggering over
the full bandwidth of the vertical system. The horizontal
system provides calibrated sweep speeds from 0.5 s per
division to 50 ns per division, along with delayed-sweep
features, thus accommodating accurate relative-time
measurements. A X10 magnifier circuit extends the maxi
mum sweep speed to 5 ns per division when the S C/DIV
switch is set to 0.05 fis per division.
The instrument is shipped with the following standard
accessories:
2 Probe packages
1 Accessory pouch
1 Operators manual
1 Service manual
1 Accessory pouch, zip lock
1 Crt filter, clear plastic
2 1.0-A AGC fast-blow fuses
1 0.5-A AGC fast-blow fuse
For part numbers and further information about both
standard and optional accessories, refer to the "Acces
sories'' page at the back of this manual. Your Tektronix
representative or local Tektronix Field Office can also
provide accessories information.
2335 Operators 1

PREPARATION FOR USE
Refer to the Safety Summary at the front of this manual
for power source, grounding, and other safety considera
tions pertaining to the use of the 2335. Before connecting
the instrument to a power source, read the following infor
mation, then verify that the LIN VOLTAG S L CTOR
switch is properly set for the ac power source being used
and that the proper power-input fuse is installed.
j CAUT ON <
This instrument may be damaged if operated with
the L NE VOLTAGE SELECTOR switch set for the
wrong applied ac power input source voltage or if the
wrong line fuse is installed.
LINE VOLTAGE SELECTION
The 2335 operates from either a 115-V or a 230-V
nominal ac power input source with a line frequency
ranging from 48 Hz to 440 Hz. Before connecting the
power cord to a power input source, verify that the LIN
VOLTAG S L CTOR switch, located on the rear panel
(see Figure 1), is set for the correct nominal ac power input
source voltage. To convert the instrument for operation
from one line-voltage range to the other, move the LIN
VOLTAG S L CTOR switch to the correct nominal ac
source voltage position (see Table 1). If your instrument is
equipped with Option 03 (100-V/200-V Power Trans
former), use Table 2. The detachable power cord may have
to be changed to match the power source outlet.
22335 Operators

D TACHABL
POW R CORD
LIN VOLTAG
S L CTOR SWITCH
ers t axis input ra m m peak wax
POSITIV MING INPUT D CR AS S INT NSITY
5V P-P CAUS S NOTIC ABL MODULATION AT
NORMAL INT NSITY.
CAUTION
OO NOT R MOV COV RS. R F R
S RVICING TO QUALIFI D P RSONN L
FOB CONTINU D fffi PROT CTION,
R PUT ONLY WTH SP CIFI S TYP
AND RAT D FUS . DISCONN CT POW R
INPUT B FOR R PLACING FUS .
CAUTION
TO AVOID L CTRIC SHOCK
TH POW R COffl PROT CTIV
GROUNDING CONDUCTOR FAUST
B CONN CT D TO GROUND.
UN VOLTAG
S L CTOR
RANG
mv-asy
l KIMWX INC. B AV RTON. OR GON. USA.
-r-rr-*?*
LIN
FUS
CORD-S T-
S CURING
CLAMP
4115-15
Figure 1. LIN VOLTAG S L CTOR switch, line fuse, and power cord.
2335 Operators 3

Table 1
Line Voltage and Fuse Selection LINE FUSE
Line Voltage
Selector Switch
Position Voltage
Range
To verify that the instrument power-input fuse is of
proper value for the nominal ac source voltage, perform
Fuse Data the following procedure:
115 V Nominal 100 to 132 V 1.0 A, 250 V, Fast-blow
230 V Nominal 200 to 250 V ri c a orr> w r- , , 1. Press in the fuse holder cap and release it with a
0.5 A, 250 V, Fast-blow .. u-k , , . „ ^
' ___ s haht counterc ockwise rotation
Table 2
Option 03 Line Voltage and Fuse Selection 2. Pul! the cap {with the attached fuse inside) out of
. . .................. _ thp fi isp holder
Line Voltage
Selector Switch
Position Voltage
Range Fuse Data
100 V Nominal 90 to 115 V 3. Verify proper fuse value {see Tables 1 and 2).
1.0 A, 250 V, Fast-blow
200 V Nominal 180 to 230 V 0.5 A, 250 V, Fast-blow
42335 Operators R V JUL 1981

POWER CORD
This instrument has a detachable, three-wire power cord
with a three-contact plug for connection to both the power
source and protective ground. Its power cord is secured to
the' rear panel by a cord-set-securing damp. The plug
protective-ground contact connects {through the power-
cord protective grounding conductor} to the accessible
metal parts of the instrument. For electrical-shock pro
tection, insert this plug into a power source outlet that has
a properly grounded protective-ground contact.
Instruments are shipped with the required power cord
as ordered by the customer. Available power cord options
are illustrated in Figure 2, and their part numbers are listed
on the "Accessories" page at the back of this manual.
Contact your Tektronix representative or local Tektronix
Field Office for additional power-cord information.
NOTE
See Appendix A at the back of this manual for further
power input information.
P lu g
Configuration Usage
Nominal
Line-
Voltage
(AC)
Reference
Standards Option #
*North
American
120 V/
15A
120 V ANSI 073.11* N MA 5-15-P
( C 33° Standard
ir
Universal
uro
240V/
10-16A
240V C (7), II, IV,
V lld
i C 83° A1
4 *
UK
240V/
13A 240V BS1363e
( C 83c A2
c:T?Tfc
Australian
240V/
10A 240V AS C112f A3
North
American
240V/
15A 240V ANSI C73.20ab
N MA 6-15-P
I C 83c A4
aANSI—American National Standards institute
bN MA—National lectrical Manufacturer's Association
cI C—International lectrotechnical Commission
dC —International Commission on Rules for the Approval of
lectrical quipment
eBS—British Standards Institution
f AS—Standards Association of Australia 2931
R V JUL 1981 2335 Operators
Figure 2. Optional power cords.
5

CONTROLS, CONNECTORS, AND INDICATORS
This section of the manual will familiarize the operator
with the location and function of instrument controls,
connectors, and indicators.
(T ) INT N Control—Determines the brightness of the crt
display (has no effect when B AM FIND switch is
pressed in).
POWER AND DISPLAY B AM FIND Switch—When held in, compresses the
display to within the graticule area and provides a
visible viewing intensity to aid in locating off-screen
displays.
Refer to Figure 3 for location of items 1 through 8.
POW R Switch—Turns instrument power on and off.
Press in for ON; press again for OFF.
(jP ) TRAC ROTATION Control—Screwdriver control
used to align the crt trace with the horizontal grati
cule lines.
(T ) FOCUS Control—Adjusts for optimum display
definition.
^T ) Internal Graticule— liminates parallax viewing error
between the trace and graticule lines. Rise-time
amplitude measurement points are indicated at the
left edge of the graticule.
(T ) ASTIG Control—Screwdriver control used in con
junction with the FOCUS control to obtain a well-
defined display over the entire graticule area. It does
not require readjustment during norma! operation
of the instrument.
(jfT) S RIAL and Mod Slots—The S RIAL slot is imprinted
with the instrument's serial number. The Mod slot
contains the option number that has been installed in
the instrument.
62335 Operators

VERTICAL
Refer to Figure 4 for location of items 9 through 19.
(jP ) AMPL CAL Connector—Provides a 0.2-V, positive
going square-wave voltage (at approximately 1 kHz}
that permits the operator to compensate voltage
probes and to check oscilloscope vertical operation.
It is not intended to verify time-base calibration.
(jo ) CH 1 OR X and CH 2 OR Y Connectors—Provide for
application of external signals to the inputs of the
vertical deflection system or for an X-Y display. In
the X-Y mode, the signal connected to the CH 1 OR
X connector provides horizontal deflection, and the
signal connected to the CH 2 OR Y connector
provides vertical deflection.
(Tf) Input Coupling Switches (AC-GND-DC)—Select the
method of coupling input signals to the vertical
deflection system.
AC—Input signal is capacitiveiy coupled to the
vertical amplifier. The dc component of the
input signal is blocked. Low-frequency limit
(—3 db point) is approximately 10 Hz.
2335 Operators 7
Figure 3. Power and display controls and indicators.

Figure 4, Vertical controls, connectors, and indicators and
calibrator output.
GIMD—'The input of the vertical amplifier is
grounded to provide a zero (ground) reference
voltage display (does not ground the input signal).
Allows precharging the input coupling capacitor.
DC—All frequency components of the input signal
are coupled to the vertical deflection system.
@ CH 1 VOLTS/DIV and CH 2 VOLTS/DIV Switches-
Select the vertical deflection factor in a 1-2-5
sequence. VAR control must be in detent to obtain
a calibrated deflection factor.
IX PROB —Indicates the deflection factor
selected when using either a IX probe or coaxial
cable.
10X PROB —Indicates the deflection factor
selected when using a 10X probe.
Ky VAR Controls—Provide continuously variable uncal
ibrated deflection factors between the calibrated
settings of the VOLTS/DIV switches when rotated
clockwise out of the detent position. Channel 1
VOLTS/DIV VAR control is inoperative when X-Y
V RTICAL MOD is selected.
82335 Operators @

M4) UNCAL Indicator—L D illuminates to indicate that
either Channel 1 or Channel 2 VOLTS/DIV VAR
control is out of calibrated detent {vertical deflection
factor is uncalibrated}.
(T?) V RTICAL MOD Switches—Five push-button
switches that select the mode of operation for the
vertical amplifier system.
CH 1—Selects only the Channel 1 input signal for
display.
ALT—The display alternates between Channel 1
and Channel 2 vertical input signals. The alter
nation occurs during retrace at the end of each
sweep. This mode is useful for viewing both
vertical input signals at sweep speeds from 0.2
ms per division to 0.05 /is per division.
CHOP—The display switches between the Channel
1 and Channel 2 vertical input signals during the
sweep. The switching rate is approximately 500
kHz. This mode is useful for viewing both Channel
1 and Channel 2 vertical inputs at sweep speeds
from 0.5 ms per division to 0,5 s per division.
ADD—Selects the algebraic sum of the Channel t
and Channel 2 input signals for display.
CH 2—Selects only the Channel 2 input signal
for display.
AUTO—Press in both ALT and CHOP buttons.
The A Sweep circuitry automatically selects the
most useful switching method (ALT or CHOP)
for dual displays.
X-Y—Press in both CH 1 and CH 2 buttons. The
X-signal is applied through the Channel 1 input
connector, and the Y-signal is applied through
the Channel 2 input connector.
(Tb) CH 2 INV RT Switch—Inverts Channel 2 display
when button is pressed in. Push button must be
pressed in a second time to release it and regain a
noninverted display.
U ) POSITION Controls—Determine the vertical position
of the displays on the crt. When X-Y V RTICAL
MOD is selected, the Channel 2 POSITION control
moves the display vertically (Y-axis), and the Hori
zontal POSITION control moves the display hori
zontally (X-axis).
2335 Operators 9