Tektronix 422 User manual

IV IA IN I U A L
j
Serial Number 3L
TYPE 422
OSCILLOSCOPE
W ith AC-DC Power Supply
SR6 20,000 end up
Tektronix, Inc.
S.W. Milli an Way • P. O. Box 500 • Beaverton, Oregon 97005 • Phone [phone] • Cables: Te tronix
070-0895-00 1268

All Te tronix instruments are warranted
against defective materials and wor man
ship for one year. Te tronix transformers,
manufactured in our plant, are warranted
for the life of the instrument.
Any questions with respect to the war
ranty mentioned above should be ta en
up with your Te tronix Field Engineer.
Te tronix repair and replacement-part
service is geared directly to the field,
therefore all requests for repairs and re
placement parts should be directed to the
Te tronix Field Office or representative
in your area. This procedure will assure
you the fastest possible service. Please
include the instrument Type and Serial or
Model Number with all requests for parts
or service.
Specifications and price change privi
leges reserved.
Copyright © 1968 by Te tronix, Inc.,
Beaverton, Oregon. Printed in the United
States of America. All rights reserved.
Contents of this publication may not be
reproduced in any form without permis
sion of the copyright owner.

CONTENTS
Section 1 Type 422 AC-DC Specification
Section 2 Operating Instructions
Section 3 Circuit Description
Section 4 Maintenance
Section 5 Performance Chec /Calibration
Abbreviations and Symbols
Parts Ordering information
Section 6 Electrical Parts List
Mechanical Parts List Information
Section 7 Mechanical Parts List
Section 8 Diagrams
Mechanical Parts List Illustrations
Accessories
Abbreviations and symbols used in this manual are
based on or ta en directly from IEEE Standard
260 "Standard Symbols for Units", MIL-STD-12B
and other standards of the electronics industry.
Change information, if any, is located at the rear of
this manual.

R"' TV" 422 ^ «» AC-OC P o ^ p p ,,.
Type 422 AC-DC

SECTION 1
TYPE 422 SPECI ICATION
W ith AC-DC Power Supply
Change information, if any, affecting this section will be found at the rear of this manual.
Introduction
The Te tronix Type 422 Oscilloscope is a solid-state
portable instrument that combines small size and light
weight with the ability to ma e precision waveform meas
urements. The instrument is mechanically designed to with
stand the shoc , vibration and other extremes of environ
ment associated with portability. The dual-channel DC-to-
15 megahertz vertical system provides calibrated deflection
factors from 0.01 to 20 volts/division. A X I0 gain feature
in Channel 2 allows each Channel 2 deflection factor to be
increased 10 times and provides a minimum deflection
factor for Channel 2 of 0.001 volt/division in the 0.01 posi
tion (AC-coupled with reduced frequency response). The
trigger circuits provide stable triggering over the full range
of vertical frequency response. The horizontal deflection
system provides calibrated sweep rates from 0.5 second to
0.5 microsecond/division. A X I0 horizontal magnifier
allows each sweep rate to be increased 10 times and pro
vides a maximum sweep rate of 0.05 microsecond/division
in the 0.5 jus position. X-Y measurements can be made by
applying the vertical (Y) signal to either the INPUT 1 or
INPUT 2 connector and the horizontal (X) signal to the
HORIZ IN OR TRIG IN connector (TIME/DIV switch set
to EXT HORIZ).
The Type 422 with AC-DC Power Supply can be op
erated from any one of three power sources; AC line, exter
nal DC, or internal rechargeable batteries. The regulated
low-voltage power supply assures that instrument perform
ance is not affected by variations in internal battery charge
level, applied DC voltage, or AC line voltage and frequency.
Maximum total power consumption is 26 watts for external
DC operation and 30 watts for AC operation. The instru
ment will operate about four hours from the internal bat
teries when fully charged.
This instrument will meet the electrical characteristics
listed in Table 1-1 following complete calibration as given
in Section 5. The performance chec procedure given in
Section 5 provides a convenient method of chec ing instru
ment performance without ma ing internal chec s or
adjustments. The following electrical characteristics apply
over a calibration interval of 1000 hours and an ambient
temperature range of —15° C to +55° C, except as other
wise indicated. Warmup time for given accuracy is 20
minutes.
TABLE 1-1
ELECTRICAL
Characteristic Performance
VERTICAL DEFLECTION SYSTEM
Deflection Factor
Channel 1 or 2 cali
brated range, XI
gain
Without probe 10 millivolts/division to 20 volts/
division in 11 steps. Steps in 1-2-
5 sequence.
With P6012 Probe 100 millivolts/division to 200
volts/division in 11 steps. Steps
in 1-2-5 sequence.
Channel 2 only cali
brated range, X I0
gain
Without probe One millivolt/division to two
volts/division in 11 steps. Steps
in 1 -2-5 sequence.
Characteristic Performance
With P6012 Probe 10 m illivolts/division to 20
volts/division in 11 steps. Steps
in 1-2-5 sequence.
Channel 1 or 2 accu
racy, XI gain
With or without
probe Within 3% of indicated deflec
tion.
Channel 2 only "accu
racy, X10 gain
With or without
probe
+20° C to +30°
C—15° C to +55°
C
Within 4% of
indicated de
flection.
Within 7.5% of
indicated de
flection.
Uncalibrated (variable)
range Continuously variable between
calibrated deflection factor
settings. Extends maximum un
calibrated deflection factor to at
least 50 volts/division.
1-1

Specification—Type 422 AC-DC
Characteristic Performance
Low-Frequency Line
arity 0.15 division or less compression
or expansion of a center-screen
two-division signal when posi
tioned to the top and bottom of
the graticule area.
Bandwidth with Four-
Division Reference
DC input coupling
Channel 1 or 2,
XI gain DC to 15 megahertz or greater (—3 dB points).
Channel 2 only,
X10 gain DC to five megahertz or greater (—3 dB points).
AC input coupling
Channel 1 or 2,
XI gain
Without probe Two hertz or less to 15 mega
hertz or greater (—3 dB points).
With P6012 Probe 0.2 hertz of less to 15 megahertz
or greater (—3 dB points).
Channel 2 only,
X10 gain
With or without
probe Five hertz or less to five mega
hertz or greater (—3 dB points).
Step Response
Risetime
Channel 1 or 2,
XI gain 24 nanoseconds or less.
Channel 2 only,
X10 gain 70 nanoseconds or less.
Aberrations
With four-division
pulse centered
vertically
Pea aberrations not to exceed
+3% or —3%; total pea -to-pea
aberrations not to exceed 3%.
With eight-division
pulse centered
vertically
Pea aberrations not to exceed
+5% or —5%; total pea -to-pea
aberrations not to exceed 5%.
Vertical Display Modes
(selected by front-
panel vertical Mode
switch)
Channel 1 only.
Channel 2 only.
Dual-trace, alternate between
channels.
Dual-trace, chopped between
channels.
Added algebraically.
Input Coupling Modes
(selected by front-
panel Input Coupling
switch)
AC (capacitive) coupled or DC
(direct) coupled.
Characteristic Performance
Maximum Input Volt
age
AC and DC input
coupling 300 volts (DC + pea AC). Pea -
to-pea AC less than 300 volts
(one ilohertz or less).
Input RC Characteris
tics
Resistance One Megohm ±2%.
Capacitance 33 picofarads ±1 pF.
Time constant 33 microseconds ±1%.
1 nput Current at +20°
C to +30° C Negligible.
Step Attenuator Balance 0.1 division or less trace shift be
tween calibrated VOLTS/DIV
switch positions.
DC Drift
Drift with time
Short term (with
temperature and
line voltage con
stant)
0.1 division or less during any
minute within first hour after
20-minute warmup.
Long term (temper
ature between +20°
C and +30° C and
line voltage con
stant)
0.2 division or less total during
first hour after 20-minute warm
up.
Drift with line voltage
change (temperature
held constant)
0.1 division or less with line volt
age varied from low line to high
line.
Drift with temperature
(line voltage constant) 0.2 division or less for each 10° C change in temperature.
Common Mode Rejection
Ratio 100:1 or greater at 50 ilohertz
with optimized setting of Chan
nel 1 and 2 GAIN adjustments at
one ilohertz.
Channel Isolation (at 15
megahertz)
Equal deflection fac
tors At least 100:1.
Unequal deflection
factors At least 10,000:1.
Chopped Mode
Repetition rate 150 ilohertz ±20%.
Time segment from
each channel 2.0 to 4.7 microseconds.
Polarity Inversion (select
ed by Channel 2 IN
VERT switch)
Displayed signal from Channel 2
can be inverted.
1-2

Specification—Type 422 AC-DC
Characteristic Performance
Delay Line Permits viewing of leading edge
of triggering signal (internal trig
gering only).
TRIGGERING
Trigger Source (select
ed by front-panel
TRIGGERING
Source switch)
Internal from both Channel 1
and 2.
Internal from Channel 1 only.
External from signal applied to
TRIG IN connector.
Trigger Coupling (select
ed by front-panel
TRIGGERING
Coupling switch)
AC (capacitive)coupled.
AC (capacitive) coupled with
attenuation of low-frequency
signals.
DC (direct) coupled.
Trigger Slope (select
ed by front-panel
SLOPE switch)
Sweep can be triggered from the
positive-going or negative-going
portion of trigger signal.
Trigger Level LEVEL control allows selection
of the triggering point on the
selected slope of the trigger
signal.
Trigger Mode (select
ed by front-panel
TRIGGERING Mode
switch)
AUTO Mode for triggered sweep
at point selected by LEVEL con
trol when adequate trigger signal
is applied (see Trigger Sensitiv
ity); sweep free runs at sweep
rate selected by TIME/DIV
switch when trigger signal is in
adequate or below 20 hertz.
NORM Mode for triggered sweep
at point selected by LEVEL con
trol when adequate trigger signal
is applied (see Trigger Sensitiv
ity); no trace when trigger signal
is inadequate.
Trigger Sensitivity
(AUTO and NORM
Mode)
Internal
AC 0.2 division of deflection mini
mum, 50 hertz to five mega
hertz; increasing to one division
at 15 megahertz.
AC LF REJ 0.2 division of deflection mini
mum, 50 ilohertz to five mega
hertz; increasing to one division
at 15 megahertz. Will not trigger
on two-division or less sine wave
at 120 hertz or less.
Characteristic Performance
DC 0.2 division of deflection mini
mum, DC to five megahertz; in
creasing to one division at 15
megahertz.
External
AC 125 millivolts minimum, 50
hertz to five megahertz; increas
ing to 0.6 volt at 15 megahertz.
AC LF REJ 125 millivolts minimum, 50 ilo
hertz to five megahertz; increas
ing to 0.6 volt at 15 megahertz.
Will not trigger on 1.25 volt or
less sine wave at 120 hertz or
less.
DC 125 millivolts minimum, DC to
five megahertz; increasing to 0.6
volt at 15 megahertz.
External Trigger Input
RC characteristics 100 ilohms ±3% paralleled by
33 picofarads ±5 pF.
Maximum Input volt
age 250 volts DC + pea AC.
LEVEL control range At least +10 to —10 volts.
TIME BASE
Sweep Rate
Calibrated range
Unmagnified 0.5 second to 0.5 microsecond/
division in 19 steps. Steps in
1-2-5 sequence.
Magnified 50 milliseconds to 0.05 micro-
second/division in 19 steps.
Steps in 1-2-5 sequence.
Uncalibrated (vari
able) range Continuously variable between
calibrated sweep rate settings.
Extends slowest uncalibrated
sweep rate to at least 1.25
seconds/division.
Accuracy
Unmagnified
Over center eight
divisions Within 3% of indicated sweep
rate.
Over any two divi
sion portion with
in center eight
divisions
Within 4% of indicated sweep
rate.
Magnified
Over center eight
divisions Within 5% of equivalent sweep
rate.
1-3

Specification—Type 422 AC-DC
Characteristic Performance
Over any two Within 7.5% of equivalent sweep
division portion rate.
within center
eight divisions
Sweep Length 10.4 to 12.1 divisions.
EXTERNAL HORIZONTAL INPUT
Deflection Factor
X I0 MAG switch
pushed in 10 volts/division.
X I0 MAG switch
pulled out One volt/division.
Accuracy Within 25%.
HORIZ ATTEN Range At least 10:1.
Bandwidth DC to 500 ilohertz or greater
(—3 dB points).
Input RC Characteris
tics 300 ilohms ±10% paralleled by
35 picofarads ±3 pF.
CALIBRATOR
Waveshape Square wave.
Polarity Negative-going with baseline at
zero volts.
Output Voltage
CALIBRATOR jac Two volts pea to pea .
Internal 0.2 volts. Internally connected
to Input Amplifiers in CALI
BRATE 4 DIVISIONS positions
of Channel 1 and 2 VOLTS/DIV
switches.
Repetition Rate One ilohertz.
Accuracy
Voltage +20° C to +30°
C-15° C to +50°
C
CALIBRATOR jac Within 0.5%. Within 1.5%.
Internal Within 1.5%. Within 2.5%.
Repetition rate Within 20%.
Duty Cycle 45% to 55%.
Output Resistance 1.95 ilohms ±3%.
Z AXIS INPUT
Sensitivity Two volt signal blan s trace.
Polarity of Operation Positive-going signal required.
Input Resistance 250 ohms ±10%.
Characteristic Performance
SIGNAL OUTPUTS
Gate
Waveshape Rectangular.
Polarity Negative-going with baseline
near zero volts.
Output voltage 0.5 volt or greater.
Duration Same duration as sweep.
Output Resistance 620 ohms ±10%.
CATHODE-RAY TUBE (CRT)
Graticule
Type Internal with variable edge light
ing.
Area Eight divisions vertical by 10
divisions horizontal. Each divi
sion equals 0.8 centimeter.
Horizontal Resolution 140 lines in 10 divisions.
POWER SUPPLY
AC
Line voltage range
(selected by rear-
panel Power Mode
switch)
115-volts nominal
Operating 92 to 137 volts AC RMS.
Battery charging 92 to 126.5 volts AC RMS.
230-volts nominal
Operating 184 to 274 volts AC RMS. 1
Battery charging 184 to 253 volts AC RMS.
Line frequency 45 to 440 hertz. Derate upper j
line voltage limit linearly to a
maximum of 10% between 50
and 45 hertz.
Maximum power con
sumption 95 to 137
volts line, operating
or charging
30 watts, 0.4 ampere.
DC
Voltage range 11.5 to 35 volts DC with sup
plied DC power cord.
Chassis to external
source potential +200 volts measured from chas
sis to power source.
Maximum Power
consumption 26 watts. Maximum current
(amperes) = 26 + applied DC
voltage.
El L1-4

Specification—Type 422 AC-DC
Characteristic Performance
Battery
Batteries 20 size D nic el-cadmium cells
supplied in battery pac , Te 
tronix Part No. 016-0066-02
(optional accessory).
Charge time (Power
Mode switch set to
CHARGE BATT
115V AC or 230V
AC)
At least 16 hours to reach full
capacity.
Operating time1 (bat
teries charged and
operated at +20° C
to +30° C)
SCALE ILLUM
off (full count
ercloc wise)
At least five hours
SCALE ILLUM
at maximum
(fully cloc wise)
At least 4.5 hours.
TABLE 1-2
ENVIRONMENTAL
NOTE
This instrument will meet the electrical characteristics
given in Table 1-1 over the following environmental
limits. Complete details on environmental test pro
cedures, including failure criteria, etc., can be obtain
ed from Te tronix, Inc. Contact your local Te tronix
Field Office or representative.
Temperature
Without batteries
Operating -15° Cto +55° C
Non-operating -55° C to +75° C.
With batteries
Operating -15° Cto +40° C.
Non-operating -40° C to +60° C.
Altitude
Operating 15,000 feet maximum.
Non-operating Test limit 50,000 feet.
Characteristic Performance
Humidity
Non-operating Five cycles (120 hours) of Mil-
Std-202C, Method 106B. Omit
freezing and vibration. Allow 24
hour post-test drying period at
+25°C ±5°C and 30% to 80%
relative humidity. Limit maxi
mum temperature to +60° C if
tested with batteries.
Vibration
Operating and non
operating 15 minutes along each of the
three major axes at a total dis
placement of 0.025-inch pea to
pea (3.9 g at 55 c/s) with fre
quency varied from 10-55-10 in
one minute cycles. Hold at any
resonant point, or if none, at 55
c/s for three minutes on each
axis.
Shoc
Operating Two guillotine-type shoc s of 30
g, one-half sine, 11-millisecond
duration each direction along
each major axis. Total of 12
shoc s.
Non-operating One guillotine-type shoc of 60
g, one-half sine, 11-millisecond
duration in each direction along
each major axis. Total of six
shoc s.
Electromagnetic Inter
ference (EMI) As Test
ed in Mil-I-6181D
Radiated interference Interference radiated from the
instrument under test within the
given limits from 150 ilohertz
to 1000 megahertz (with mesh
CRT filter installed).
Conducted interfer
ence Interference conducted out of the instrument under test
through the power cord within
the given limits from 150 ilo
hertz to 25 megahertz.
Transportation
Pac aged instrument Qualifies under National Safe
Transit Commitee test procedure
1 A, Category II.
loperating time applies to new batteries. Ampere-hour capacity
may be reduced by as much as 20% after one year.
1-5

Specification—Type 422 AC-DC
Characteristic Performance
TABLE 1-3
PHYSICAL
Ventilation Safe operating temperature is
maintained by radiant cooling.
Automatic resetting thermal cut
outs in the power supply protect
instrument from overheating.
Warm-up Time 20 minutes for rated accuracy.
Finish Anodized front panel with blue-
vinyl painted aluminum cabinet.
Overall Dimensions
(measured at maxi
mum points)
Height 6 15/16 inches (17.7 centi
meters).
Width 10 5/16 inches (26.2 centi
meters).
Depth (including
front cover) 18 9/16 inches (47.2 centi
meters).
Characteristic Performance
Depth (handle posi
tioned for carrying) 20 5/8 inches (52.4 centi
meters).
Weight
Without battery pac
Without front
cover 20 1/2 pounds (9.3 ilograms).
With front cover
and standard
accessories
23 pounds (10.5 ilograms).
With battery pac
Without front
cover 27 1/2 pounds (12.5 ilograms).
With front cover
and standard
accessories
30 pounds (13.7 ilograms).
STANDARD ACCESSORIES
Standard accessories supplied with the Type 422 are listed
on the last pullout page of the Mechanical Parts List illus
trations. For optional accessories available for use with this
instrument, see the Te tronix, Inc. catalog.
1-6 m