Tektronix 2465 User manual

Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077
070-3832-00
Product Group 38
Tektronix
COMMITTED TO EXCELLENCE
PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAL.
2465
OSCILLOSCOPE
OPERATORS
INSTRUCTION MANUAL
Serial Number
First Printing SEP 1982
Revised JAN 1985

Copyright © 1982 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. 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:
BO00000 ‘Tektronix, Inc., Beaverton, Oregon, USA
100000 Tektronix Guernsey, Ltd., Channel Islands
200000 Tektronix United Kingdom, Ltd., London
300000 Sony/Tektronix, Japan
700000 Tektronix Holland, NV, Heerenveen,
The Netherlands

2465 Operators
TABLE OF CONTENTS
Page Page
LIST OF ILLUSTRATIONS................. i SECTION 5 OPERATOR’S CHECKS AND
LIST OF TABLES.............0.000000 005 i ADLISTMENTS
INTRODUCTION. ............ 5-1
OPERATORS SAFETY SUMMARY............ iii INITIALSETUP.............. 5-4
TRACE ROTATION
ADJUSTMENT. ...........00- 5-1
ASTIGMATISM ADJUSTMENT ... 5-2
SECTION 1 SPECIFICATION AUTO DC BALANCE
INTRODUCTION. ............ 11 ADJUSTMENT............... 5-2
PERFORMANCE CONDITIONS... 1-1 PROBE LOW-FREQUENCY
COMPENSATION............. 5-2
MATCHING CHANNEL 2 DELAY... 5-3
AMPLITUDE CHECK ........... 5-4
SECTION 2 PREPARATION FOR USE TIMING CHECK. ............. 5-4
SAFETY... 0.0.0 cece eee eee 2-1
LINE VOLTAGE SELECTION.... 2-1 SECTION 6 BASIC APPLICATIONS
LINEFUSE.............000. 24 INDEX OF PROCEDURES....... 6-1
POWERCORD............... 24 VOLTAGE MEASUREMENT ..... 6-1
INSTRUMENT COOLING ....... 3. VOLTAGE RATIO............ 6-2
START-UP. ...... 000 c eee eee 22 ALGEBRAIC ADDITION AND
REPACKAGING FOR SHIPMENT... 2-2 ELIMINATING COMMON-MODE
SIGNALS ....... 00.0 eee eee 6-3
TIME INTERVAL. ...........- 6-4
FREQUENCY ............... 6-4
TIME DIFFERENCE BETWEEN
SECTION 3 CONTROLS, CONNECTORS, TWO TIME-RELATED PULSES... 65
AND INDICATORS TIME RATIO..........-0000. 6-5
POWER AND DISPLAY......... 3-1
PHASE DIFFERENCE BETWEEN
VERTICAL... 0.0.0.0 cece eee Sa eWe TIME RELATEDEIGNAGS Lo. en
MEASUE GHENT.“ cal .. oes SMALL-ANGLE PHASE
TRIGGER. ....... 0... ce eee 3-7 BRPRBISIG Es? to etod shag ae aa
REAR PANEL.............0- 3-9 RECO ECT ORG e ie sane ot
BEAROMIL DISPLAY: 5 sn mie 7g Poy SECTION 7 OPTIONS AND ACCESSORIES
INTRODUCTION. ............ 7-1
PRION Tit ee ey ee 7-1
OPTION TA. cc bub owl ee ee 7-4
SECTION 4 OPERATING CONSIDERATIONS POWER CORD OPTIONS........ 7-1
GRATICULE..............-. 4-1 STANDARD ACCESSORIES ..... 22
TIME AND VOLTAGE OPTIONAL ACCESSORIES...... 72
MEASUREMENTS............ 4-1
GROUNDING .............0- 4-1 APPENDIX A POWER-UP TESTS
SIGNAL CONNECTIONS........ 4-2 KERNEL TESTS.............. A-1
INPUT-COUPLING CAPACITOR CONFIDENCE TESTS.......... A-1
PRECHARGING.............. 4-2
EXTERNAL TRIGGERING...... 4-2 CHANGE INFORMATION

2465 Operators
Figure
2-1
3-1
3-2
3-3
3-4
3-5
3-6
3-7
4-1
5-1
6-1
6-2
6-3
6-4
6-5
6-6
6-7
6-8
6-9
Table
1-1
1-2
1-3
2-1
A-1
LIST OF ILLUSTRATIONS
Page
Whe:24G5;Oscilloscoperyse.. ea kd ew we 6 6 a Mme we oo See MMR Gow w MSL and Seas wont iv
Line selector switch, line fuse, and detachable power cord...........0 000 eee ueae 2-2
Power-and display COntrols: . occu) oe haces ee eR a ee Sw bos DES Se Ee ace 3-1
Vertical controls and CH 1OR X and CH 2connectors.......... 0.000 eee eee eee 3-2
Channel 3 and Channel 4 controls and connectors and CALIBRATOR output .......... 3-3
Horizontal and delta measurement controls ..... 0.0... eee ee ee ee 3-4
Trigger controls and indicators... 2... ee eee ee eee 3-7
Rear-panel controls and connectors... 2... ee ee ee et eee ee 3-10
Readoutidisplay IOCations.. . . 5c es os Seas 6 6 wee 6 Oe OR oo Fw RS eS rele 3-11
Graticule measurement markings ...... 0.0.0.0. cc eee ee eee eee ee ee eee anne 4-1
Probe low-frequency compensation. ........ 000. eee ee ee ee eee eee eee eee 5-3
Instantaneous dc levels... ee ete eee ee eee 6-1
Voltageratios... 00... . tece el ec ce ees 6 9 wine's 0 8 UNE Soe Ewa EC a WUE S Iw oR a HRS 6-2
Eliminating common-mode'signals ..4:.. ccc a os tee eee SH ED HoT eo ee 6-3
Measuring Wise: tUMOS: acre eo «ie ew oe PR FS ewe Ae w wile eee 2 ome allay lee sice 6-4
Time difference between two time-related pulses (cursor method) ..............0008 6-5
Time ratios (duty cycles) .... ce ee ee ee eee eee ee ee ee ae 6-6
Phase difference between two time-related signals... .. 2.0... 0. eee ee ee ee eee 6-7
Small-angle phase difference .... 0... eee 6-7
Time difference between two time-related pulses (delayed-sweep method)............. 6-9
Page
Electrical Gharacteristicss. <6 4 see baie & HS lee Si aewe Be BR BAS we ws wes 1-2
EnvironmentaliGharacteristics. os sestane ooo has haters & BGS we eb ww wee © oe ww ewe wb 1-9
Mechanical: Criaractenistics: 4 as) o Sees ses ae ce See bw wwe ees oe 1-10
Voltage, Fuse, and Power-Cord Data... 1... . cc ee eens 2-3
Confidence Test Numbers and Descriptions ......... 0.0.0.0 ee eee ee eee ee eee A-1

2465 Operators
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
CAUTION statements identify conditions or practices
that could 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.
Terms as Marked on Equipment
CAUTION indicates a personal injury hazard not imme-
diately accessible as one reads the markings, or a hazard to
property,
including the equipment itself.
DANGER indicates a personal injury hazard immediately
accessible as one reads the marking.
Symbols in This Manual
This symbol indicates where applicable
Z\ cautionary or other information is to be
found. For maximum input voltage see
Table 1-1.
Symbols as Marked on Equipment
& DANGER — High voltage.
i) Protective ground (earth) terminal.
PAN ATTENTION — 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. 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 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. 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 acces-
sible 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 connectors
see Table 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 Atmospheres
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.

2465 Operators
Tektronix 2485 sos cscuscscon
The 2465 Oscilloscope.
3832-01

—
Section 1—2465 Operators
SPECIFICATION
INTRODUCTION
The TEKTRONIX 2465 Oscilloscope is a portable
300-MHz instrument having a four-channel vertical deflec-
tion system. Channel 1 and Channel 2 provide calibrated
deflection factors from 2mV per division to 5V per
division. For each of these channels, input impedance is
selectable between two values: either 1 MQ in parallel
with 15 pF, or 502 internal termination. Input-signal
coupling with 1-MQ impedance can be selected as either
AC or DC. Channel 3 and Channel 4 have deflection factors
of either 0.1 V or 0.5 V per division. Each of these channels
has an input impedance of 1 MQ in parallel with 15 pF,
with DC input-signal coupling. Trigger circuits enable stable
triggering over the full bandwidth of the vertical system.
The horizontal deflection system provides calibrated
sweep speeds from 1.5s per division to 500 ps per division.
Drive for the horizontal deflection system is obtained from
a choice of A, B delayed, A alternated with B delayed
sweeps, or CH 1 (for the X-Y display mode).
The 2465 incorporates alphanumeric crt readouts of the
vertical and horizontal scale factors, the trigger levels,
time-difference measurement values, voltage-difference
measurement values, and certain auxiliary information.
The 2465 Oscilloscope is shipped with the following
standard accessories:
Probe packages
Snap-lock accessories pouch
Zip-lock accessories pouch
Operators manual
Power cord (installed)
2-A, 250-V fuse
Clear plastic crt filter
Blue plastic crt filter (installed)
Front-panel cover
Operators pocket reference card
we
ek
ees
as
ND
For part numbers and further information about both
standard and optional accessories, refer to “Options and
Accessories’’ (Section 7) of this manual. Your Tektronix
representative or local Tektronix Field Office can also
provide accessories information and ordering assistance.
PERFORMANCE CONDITIONS
The following electrical characteristics (Table 1-1)
are valid for the 2465 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 —15°C and +55°C
(unless otherwise noted).
Items listed in the ‘Performance Requirements” column
are verifiable qualitative or quantitative limits that define
the
measurement capabilities of the instrument.
Environmental characteristics are given in Table 1-2.
The 2465 Oscilloscope meets the environmental require-
ments of MIL-T-28800C for Type III, Class 3, Style C
equipment, with the humidity and temperature require-
ments defined in paragraphs 3.9.2.2, 3.9.2.3, and 3.9.2.4.
Mechanical characteristics of the 2465 are listed in
Table 1-3.
1-1

Specification—2465 Operators
Table 1-1
Electrical Characteristics
Characteristics Performance Requirements
VERTICAL DEFLECTION SYSTEM—CHANNEL 1 AND CHANNEL 2
Deflection Factor
Range 2 mV per division to 5 V per division in a 1-2-5 sequence of 11 steps.
Accuracy
+15°C to +35°C
Within +2% at any VOLTS/DIV setting for a 4- or 5-division signal
centered on the screen.
—15°C to +15°C and +35°C to +55°C
Add 1% to +15°C-to-+35°C specification.
AV Accuracy (using cursors over entire
graticule area)
+15°C to +35°C + (1.25% of reading + 0.03 division + signal aberration).
—15°C to +15°C and +35°C to +55°C Add 1% of reading to +15°C-to-+35°C specification.
AV Range
+ 8 times the VOLTS/DIV switch setting.
Variable Range
Continuously variable between VOLTS/DIV switch settings. Extends
deflection factor of the 5 V per division setting to at least 12.5 V
per division.
Frequency Response
Six-division reference signal from a terminated 50-Q system, with
VAR VOLTS/DIV control in calibrated detent.
—3 dB bandwidth —4.7 dB bandwidth
with standard-accessory with 50-2 external
VOLTS/DIV probe or internal termination on
setting 50-2 termination 1-MQ input
—15°C to +55°C 2mV DC to 100 MHz DC to 100 MHz
—15°C to +35°C 5 mV or greater DC to 300 MHz DC to 300 MHz
+35°C to +55°C 5 mV or greater DC to 250 MHz DC to 250 MHz
AC Coupled Lower —3 dB Point
1X Probe
10 Hz or less.
10X Probe
1 Hz or less.
Step Response
Rise Time
1.17 ns or less for VOLTS/DIV switch settings of 5 mV and up
(calculated).
3.5 ns or less for VOLTS/DIV switch setting of 2 mV (calculated).
Rise time calculated from: bandwidth x rise time = 0.35.
Common-mode Rejection Ratio (CMRR)
At least 20:1 at 50 MHz for common-mode signals of eight divisions
or less, with VAR VOLTS/DIV control adjusted for best CMRR at 50
kHz at VOLTS/DIV switch settings from 5 mV to 5 V. At least 20:1 at
20 MHz for the 2 mV switch setting.
1-2 REV JAN 1984
—~
—

Specification—2465 Operators
Table 1-1 (cont)
REV SEP 1984
~~ Characteristics Performance Requirements
VERTICAL DEFLECTION SYSTEM—CHANNEL 1 AND CHANNEL 2 (cont)
Channel Isolation 100:1 or greater attenuation of the deselected channel at 100 MHz;
50:1 or greater attenuation at 300 MHz, for an eight-division input signal
from 2 mV per division to 500 mV per division, with equal VOLTS/DIV
switch settings on both channels.
Displayed Channel 2 Signal Delay with Respect to Adjustable through a range of at least —500 ps to +500 ps.
Channel 1 Signal
Input R and C (1 MQ)
Resistance 1MQ +0.5%.
Capacitance 15 pF +2 pF.
Maximum Input Voltage J\ 400 V (dc + peak ac). 800 V p-p ac at 10 kHz or less.
Input R (50 Q)
Resistance 502 +1%.
VSWR (DC to 300 MHz) 1.3:1 or less.
Maximum Input Votlage 5 V rms; 0.5 W-seconds during any 1-s interval for instantaneous
(DC Coupling Only) voltage from 5 V to 50 V.
Maximum pulse duty factor and maximum pulse duration for a one
: second interval that produce 0.5 W-seconds into 50 2 input with a 5 V
—™~ rms maximum allowable input voltage are determined from the
following:
; . 5V \2
Maximum duty factor of applied pulse = :
pulse
; . . 5V \2
Maximum duration of applied pulse = V sec.
pulse
Cascaded Operation CH 2 SIGNAL OUT into Channel 1 input; DC coupled using a 50-Q RG-
58C/U coaxial cable, terminated in 50 at the Channel 1 input.
Channel 1 and Channel 2 VOLTS/DIV switch set to 2 mV.
Bandwidth Dc to 50 MHz or greater.
Deflection Factor 400 uV per division + 10%.
VERTICAL DEFLECTION SYSTEM—CHANNEL 3 AND CHANNEL 4
Deflection
Values 0.1 V per division and 0.5 V per division.
Accuracy Within + 10%.
—~
1-3

Specification—2465 Operators
Table 1-1 (cont)
Characteristics
Performance Requirements
VERTICAL DEFLECTION SYSTEM—CHANNEL 3 AND CHANNEL 4 (cont)
Frequency Response (3-dB Bandwidth)
—15°C to +35°C
Six-division reference signal, from a terminated 50-Q system.
—3 dB Bandwidth
With standard-accessory probe
—4.7 dB Bandwidth
With external 50-02 termination
DC to 300 MHz DC to 300 MHz
+35°C to +55°C
DC to 250 MHz DC to 250 MHz
Step Response
Rise Time 1.17 ns or less (calculated from bandwidth).
Channel Isolation 50:1 or greater attenuation of the deselected channel at 100 MHz with
an eight-division input signal.
Input R and C
Resistance 1MQ +1%.
Capacitance 15 pF +3 pF.
Maximum Input Voltage Av
400 V (dc + peak ac);
800 V p-p ac at 10 kHz or less.
VERTICAL DEFLECTION SYSTEM—ALL CHANNELS
Low-frequency Linearity 0.1 division or less compression or expansion of a two-division, center-
screen signal when positioned anywhere within the graticule area.
Bandwidth Limiter Reduces upper 3-dB bandpass to limit of 13 MHz to 24 MHz.
Vertical Signal Delay At least 20 ns of the sweep is displayed before the triggering event is
displayed.
Chopped Mode Switching Rate Vertical display switches sequentially through the selected channels at
the chop switching rate. If the B SEC/DIV switch is set to sweep speeds
outside the range of 20 us per division to 2 us per division, the switching
rate is 1 MHz +0.2% (dual-channel cycle rate of 500 kHz). If the B
SEC/DIV switch is set within the range of 20 us per division to 2 ws per
division, the switching rate is 2.5 MHz +0.2% (dual-channel cycle rate
of 1.25 MHz). At all sweep speeds, the chop switching rate is
desynchronized with the sweep frequency to minimize waveform breaks
when viewing repetitive signals.
TRIGGERING
Minimum P-P Signal Amplitude for Stable
Triggering from Channel 1 or Channel 2 Source
DC Coupled
0.35 division from de to 50 MHz, increasing to 1 division at 300 MHz,
1.5 divisions at 500 MHz in ADD MODE.
NOISE REJ Coupled
1.2 divisions or less from dc to 50 MHz, increasing to 3 divisions at
300 MHz, 4.5 divisions at 500 MHz in ADD MODE.
AC Coupled
0.35 division from 60 Hz to 50 MHz, increasing to 1 division at300 MHz, -—~
1.5 divisions at 500 MHz in ADD MODE. Attenuates signals below
60 Hz.
REV SEP 1984