Tektronix 2235 User manual

Tektronix, Inc.
P.0. Box 500
Beaverton, Oregon
070-4207-00
Product Group 46
Tektronix
COMMITTED TO EXCELLENCE
PLE SE CHECK FOR CH NGE INFORM TION
T THE RE R OF THIS M NU L.
OSCILLOSCOPE
OPER TORS
INSTRUCTION MANUAL
97077 Seri l Number
First Printing OCT 1982
Revised APR 1987

Copyright ^ 1982 Tektronix, Inc. All rights reserved.
Contents of this public tion m y not be reproduced in ny
form without the written permission of Tektronix, Inc.
Products of Tektronix, Inc. nd its subsidi ries re covered
by U.S. nd foreign p tents nd/or pending p tents.
TEKTRONIX, TEK, SCOPE-MOBILE, nd re
registered tr dem rks of Tektronix, Inc. TELEQUIPMENT
is registered tr dem rk of Tektronix U.K. Limited.
Printed in U.S.A. Specific tion nd price ch nge privileges
re reserved.
INSTRUMENT SERI L NUMBERS
E ch instrument h s seri l number on p rtel insert, t g,
or st mped on the ch ssis. The first number or letter
design tes the country of m nuf cture. The l st five digits
of the seri l number re ssigned sequenti lly nd re
unique to e ch instrument. Those m nuf ctured in the
United St tes h ve six unique digits. The country of
m nuf cture is identified s follows:
B000000 Tektronix, Inc., Be verton, Oregon, USA
100000 Tektronix Guernsey, Ltd., Ch nnel Isl nds
200000 Tektronix United Kingdom, Ltd., London
300000 Sony/Tektronix, J p n
700000 Tektronix Holl nd, NV, Heerenveen,
The Netherl nds

2235 Operators
T BLE OF CONTENTS
Page
LIST OF ILLUSTR TIO NS ............................................ ii
LIST OF T BLES...............................................................ii
OPER TORS S FETY SUMM RY .............................. iii
SECTION 1 GENER L INFORM TION
INTRODUCTION ..................................... 1-1
SPECIFIC TION ....................................... 1-1
C LIBR TION ....................................... 1-10
REP CK GING FOR S HIPM EN T ___ 1-10
SECTION 2 PREP R TION FOR USE
FIRST-TIME ST RT U P .......................... 2-1
S FETY...................................................2-1
LINE VOLT GE ..................................... 2-1
POWER CORD ..................................... 2-1
LINE FUSE ...............................................2-2
INSTRUMENT COO LING .................... 2-2
CONTROLS, CONNECTORS,
ND INDIC TORS ..................................... 2-3
POWER, DISPL Y, ND
PROBE DJUST....................................2-3
VERTIC L .............................................. 2-4
HORIZONT L .......................................... 2-5
TRIG GER.................................................2-6
RE R P NEL .......................................... 2-8
SECTION 3 OPER TING CONSIDER TIONS
GENER L OPER TING
INFORM TION ......................................... 3-1
GR TICULE ......................................... 3-1
G R O U N D IN G ...................................... 3-1
SIGN L CONNECTIONS ................... 3-1
INPUT COUPLING C P CITOR
PRECH RGING....................................3-1
OPER TOR'S DJUSTMENTS .............. 3-2
TR CE RO T TIO N ............................3-2
PROBE COMPENS TION.................3-2
Page
SECTION 4 OPER TING PROCEDURES
INSTRUMENT
F M ILI R IZ TIO N ................................. 4-1
INTRO DUCTION ................................. 4-1
B SELINE TR CE .............................. 4-1
DISPL YING SIGN L ................... 4-2
B SIC PPLIC TIONS ........................... 4-7
INDEX TO B SIC
PPLIC TION PROCEDURES. . . . 4-7
NONDEL YED
ME SUREMENTS .............................. 4-7
DEL YED-SWEEP
M G N IF IC TIO N .............................. 4-16
DEL YED-SWEEP
TIME ME SUREMENTS ................... 4-18
SECTION 5 OPTIONS ND CCESSORIES
O PT IO N S..................................................5-1
ST ND RD CCESSORIES
INCLUDED ............................................... 5-1
OPTION L CCESSORIES .............. 5-1
FRONT P NEL ILLUSTR TION
CH NGE INFORM TION
REV NOV 1985 I

2235 Operators
LIST OF ILLUSTR TIONS
Figure Page
1-1 Maximum input voltage vs frequency derating curve for CH 1 OR X, CH 2 OR Y,
and EXT INPUT connectors ...................................................................................................................................................1-6
1- 2 Physical dimensions of the 2235 Oscilloscope ....................................................................................................................1-9
2- 1 Power cord clamp and line fu se ...............................................................................................................................................2-1
2-2 Voltage, power cord, and fuse d a ta........................................................................................................................................2-2
2-3 Power, display, and probe adjust controls, connector, and indicator ............................................................................ 2-3
2-4 Vertical controls and connectors..............................................................................................................................................2-4
2-5 Horizontal controls...................................................................................................................................................................... 2-5
2-6 Trigger controls, connector, and indicator.............................................................................................................................2-6
2- 7 Rear-panel connector..................................................................................................................................................................2-8
3- 1 Graticule measurement markings............................................................................................................................................3-1
3- 2 Probe compensation ..................................................................................................................................................................3-3
4- 1 Initial setup for instrument familiarization procedure...........................................................................................................4-2
4-2 Peak-to-peak waveform voltage..............................................................................................................................................4-7
4-3 Instantaneous voltage measurement.....................................................................................................................................4-9
4-4 lgebraic addition.......................................................................................................................................................................... 4-10
4-5 Common-mode rejection............................................................................................................................................................. 4-10
4-6 Time duration.................................................................................................................................................................................4-11
4-7 Rise time..........................................................................................................................................................................................4-11
4-8 Time difference between two time-related pulses...................................................................................................................4-12
4-9 Phase difference.............................................................................................................................................................................4-13
4-10 High-resolution phase difference................................................................................................................................................4-14
4-11 Delayed-sweep magnification.................................................................................................................................................... 4-17
4-12 Pulse jitter........................................................................................................................................................................................4-17
4-13 Time difference between repetitive pulses..............................................................................................................................4-18
4-14 B DEL Y TIME POSITION control settings............................................................................................................................4-19
4-15 Rise time, differential time method............................................................................................................................................4-19
4-16 Time difference between two time-related pulses, differential time method .................................................................... 4-20
LIST OF T BLES
Table Page
1-1 Electrical Characteristics............................................................................................................................................................. 1-1
1-2 Environmental Characteristics.................................................................................................................................................... 1-7
1-3 Physical Characteristics...............................................................................................................................................................1-8
4-1 Equipment Required for Instrument Familiarization Procedure...........................................................................................4-1
ii REV J N 1986

2235 Operators
OPER TORS S FETY SUMM RY
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
C UTION statements identify conditions or practices
that could result in damage to the equipment or other
property.
W RNING statements identify conditions or practices
that could result in personal injury or loss of life.
Grounding the Product
This product is grounded through the grounding conductor
of the power cord. To avoid electrical shock, plug the
power cord into a properly wired receptable before con
necting to the product input or output terminals.
protective ground connection by way of the grounding
conductor in the power cord is essential for safe operation.
Terms as Marked on Equipment
C UTION indicates a personal injury hazard not imme
diately accessible as one reads the markings, or a hazard to
property, including the equipment itself.
D NGER indicates a personal injury hazard immediately
accessible as one reads the marking.
Danger rising From Loss of Ground
Upon loss of the protective-ground connection, all acces
sible conductive parts (including knobs and controls that
may appear to be insulating) can render an electric shock.
Symbols in This Manual
This symbol indicates where applicable
cautionary or other information is to be
found. For maximum input voltage see
Table 1-1.
Symbols as Marked on Equipment
D NGER — High voltage.
Protective ground (earth) terminal.
TTENTION - Refer to manual.
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. protective ground connection by way of the
grounding conductor in the power cord is essential for safe
operation.
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 connectors
see Figure 2-1.
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 Explosive tmospheres
To avoid explosion, do not operate this product in an
explosive atmosphere unless it has been specifically cer
tified 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.

2235 Operators
4207-01
IV
The 2235 Oscilloscope.

Section 1 —2235 Operators
GENER L INFORM TION
INTRODUCTION
The TEKTRONIX 2235 Oscilloscope is a rugged, light
weight, dual-channel, 100-MHz instrument that features a
bright, sharply defined trace on an 80- by 100-mm cathode-
ray tube (crt). Its vertical system provides calibrated
deflection factors from 2 mV per division to 5 V per
division. 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 for accurate relative-time measurements. X I0
magnifier extends the maximum sweep speed to 5 ns per
division.
The instrument is shipped with the following standard
accessories:
1 Operators manual 2 Probe packages
For part numbers and further information about both
standard and optional accessories, refer to the "Options
and ccessories " section (Section 5) of this manual. Your
Tektronix representative, local Tektronix Field Office, or
Tektronix product catalog can also provide accessories
information.
SPECIFIC TION
The following electrical characteristics (Table 1-1) are
valid for the 2235 when it has been adjusted at an ambient
temperature between +20°C and +30°C, has had a warm-up
period of at least 20 minutes, and is operating at an
ambient temperature between 0°C and +50°C (unless
otherwise noted).
Environmental characteristics are given in Table 1-2.
The 2235 meets the requirements of MIL-T-28800C for
Class 5 equipment, except where otherwise noted.
Physical characteristics of the instrument are listed in
Table 1-3.
Characteristics
Table 1-1
Electrical Characteristics
Performance Requirements
VERTIC L DEFLECTION SYSTEM
Deflection Factor
Range 2 mV per division to 5 V per division in a 1-2-5 sequence.
ccuracy
+15°C to +35°C ±2%.
0°C to +50° C ±3%.
Range of VOLTS/D1V Variable Control Continuously variable between settings. Increases deflection
factor by at least 2.5 to 1.
REV DEC 1983 1-1

General Information—2235 Operators
Table 1-1 (cont)
Characteristics Performance Requirements
VERTIC L DEFLECTION SYSTEM (cont)
Step Response
Rise Time
0°C to +35° C
5 mV per Division to 5 V per Division 3.5 ns or less.
2 mV per Division 3.9 ns or less.
+35°C to +50° C
5 mV per Division to 5 V per Division 4.1 ns or less.3
2 mV per Division 4.4 ns or less.3
berrations
Positive-Going Step
2 mV per Division to 0.5 V per Division +4%, -4% , 4% p-p.
1 V per Division to 2 V per Division +8%, -8% , 8% p-p.
5 V per Division +10%, -10% , 10% p-p.
Bandwidth (—3 dB)
0°C to +35°C
5 mV per Division to 5 V per Division Dc to at least 100 MHz.
2 mV per Division Dc to at least 90 MHz.
+35° C to +50° C
5 mV per Division to 5 V per Division Dc to at least 90 MHz.
2 mV per Division Dc to at least 80 MHz.
C Coupled Lower Limit 10 Hz or less at —3 dB.
Bandwidth Limiter Upper limits (—3 dB) bandpass at 20 MHz ±10%.
Chop Mode Switching Rate 500 kHz ±30%.
Input Characteristics
Resistance 1 M£2 ±2%.
Capacitance 20 pF ±2 pF.
Rise time is calculated from the formula:
0.35
Bandwidth (—3 dB)
Rise Time

General Information—2235 Operators
Table 1-1 (cont)
Characteristics Performance Requirements
VERTIC L DEFLECTION SYSTEM (cont)
Maximum Safe Input Voltage ^ See Figure 1-1 for derating curve.
DC Coupled 400 V (dc + peak ac) or 800 V ac p-p to 10 kHz or less.
C Coupled 400 V (dc + peak ac) or 800 V ac p-p to 10 kHz or less.
Common-Mode Rejection Ratio (CMRR) t least 10 to 1 at 50 MHz.
Input Current 1.0 n or less (0.5 division trace shift at 2 mV per division).
Trace Shift with ttenuator Rotation 0.5 division or less:
VOLTS/DIV Variable control in C L detent.
Trace Shift as VOLTS/DIV Variable Control Is Rotated 1.0 division or less.
Trace Shift with Invert 1.5 divisions or less.
Channel Isolation Greater than 100 to 1 at 50 MHz.
POSITION Control Range t least ±11 divisions from graticule center.
TRIGGER SYSTEM
TRIGGER Sensitivity
P-P UTO and NORM/TV LINE Modes 10 MHz 60 MHz 100 MHz
Internal 0.3 div 1.0 div 1.5 div
External 35 mV 120 mV 200 mV
Lowest Useable Frequency in P-P UTO Mode 20 Hz with 1.0 division internal or 100 mV external.
TV FIELD Mode 1.0 division of composite sync.
B TRIGGER Sensitivity (Internal Only) 10 MHz 60 MHz 100 MHz
0.35 div 1.0 div 1.5 div
EXT INPUT
Maximum Input Voltage ^ 400 V (dc + peak ac) or 800 V ac p-p at 10 kHz or less
(see Figure 1-1).
Input Resistance 1 M£2 ±2%.
Input Capacitance 20 pF ±2.5 pF.
C Coupled 10 Hz or less at lower —3 dB point.
REV JUL 1985 1-3

General Information—2235 Operators
Table 1-1 (cont)
Characteristics Performance Requirements
TRIGGER SYSTEM (cont)
LEVEL Control Range
TRIGGER (NORM)
INT Can be set to any point of the trace that can be displayed.
EXT, DC t least ±1.6 V, 3.2 V p-p.
EXT, DGM0 t least ±16 V, 32 V p-p.
B TRIGGER
Internal Can be set to any point of the trace that can be displayed.
V R HOLDOFF Control Increases Sweep holdoff time by at least a factor of 10.
Trigger View System
Deflection Factor
Internal Same as vertical.
External
C and DC 100 mV per division.
DC-M0 1 V per division.
ccuracy ±20%.
Delay Difference Between EXT INPUT and
Either Vertical Channel Less than 2.0 ns.
Sweep Rate
Calibrated Range
Sweep
B Sweep
ccuracy
+15°C to +35°C
0°C to +50° C
POSITION Control Range
Sweep Linearity
HORIZONT L DEFLECTION SYSTEM
0.5 s per division to 0.05 /is per division in a 1-2-5 sequence.
X I0 magnifier extends maximum sweep speed to 5 ns per
division.
50 ms per division to 0.05 /is per division in a 1-2-5 sequence.
X I0 magnifier extends maximum sweep speed to 5 ns per
division.
Unmagnified Magnified
±2% ±3%
±3% ±4%
Start of sweep to 10th division will position past the center
vertical graticule line in X I or 100th division in X10.
±5%.
1-4