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

Type 422 AC-DC
SECTION 2
OPERATING INSTRUCTIONS
Change information, if any, affecting this section will be found at the rear of this manual.
General
To effectively use the Type 422, the operation and capa
bilities of the instrument must be nown. This section des
cribes the operation of the front-panel controls, gives first
time and general operating information and lists some basic
applications for this instrument.
Front Cover
The front cover furnished with the Type 422 provides a
dust-tight seal around the front panel. Use the cover to
protect the front panel when storing or transporting this
instrument. The cover also provides storage for the power
cord, probes and other accessories (see Fig. 2-1).
Fig. 2-1. Accessory storage pro ided in front co er.
OPERATING VOLTAGE
General
The Type 422 Oscilloscope with AC-DC Power Supply
features a detachable power supply section which can be
removed for convenience of operation or maintenance. A
rechargeable battery pac is also available for use with the
AC-DC Power Supply to ma e this instrument completely
portable. The following information provides removal in
structions, battery pac installation and information neces
sary for operation in each power mode as well as informa
tion on rechargeable nic el-cadmium batteries.
Removing the Power Supply
The power supply can be removed from the indicator for
maintenance, calibration, remote operation, installation of
batteries, or to gain access to the interior of the indicator.
Loosen the four securing screws located in the rear feet of
the power supply (see Fig. 2-2) and then separate the two
units by sliding the power supply to the rear, off the sup
port rods. To re-attach the power supply to the indicator,
reverse the above procedure.
Fig. 2-2. Location of screws on rear of power supply which attach
power supply to indicator.
Power Selection
The Type 422 with AC-DC Power Supply can be oper
ated from either a 115-volt or 230-volt (nominal) AC line
voltage source, from an 11.5 to 35 volt external DC source,
or from internal batteries (battery pac must be purchased
separately). The power supply also contains a battery charg
er circuit to recharge the internal batteries when operated
from an AC line voltage source. The Power Mode switch on
the rear panel of the power supply selects the operating
02-1

Operating Instructions—Type 422 AC-DC
power mode. Table 2-1 describes the operation in each posi
tion of the Power Mode switch.
TABLE 2-1
Power Mode Switch Functions
Switch Position Function
CHARGE BATT 230V AC Used when AC line voltage
applied to instrument is 230
volts nominal. Charges inter
nal battery pac at a 400
milliampere rate when
POWER switch is on. Indica
tor does not operate in this
switch position.
230V AC Provides instrument opera
tion from a 230-volt nominal
AC line voltage source. In
dicator operable and a 30
milliampere tric le charge is
applied to battery pac .
11.5-35V DC Provides instrument opera
tion from an external DC
source. Indicator operable
but no charging is provided
for battery pac .
INT BATT Provides instrument opera
tion from an internal battery
pac . Indicator operable but
battery pac cannot be
charged in this switch posi
tion.
115V AC Provides instrument opera
tion from a 115-volt nominal
AC line voltage source. In
dicator operable and a 30
milliampere tric le charge is
applied to battery pac .
CHARGE BATT 115V AC Used when AC line voltage
applied to instrument is 115
volts nominal. Charges inter
nal battery pac at a 400
milliampere rate when
POWER switch is on. Indica
tor does not operate in this
switch position.
CAUTION
Turn the POWER switch off (pushed in) before oper
ating the Power Mode switch.
AC Operation
The Type 422 with AC-DC Power Supply can be opera
ted from either a 115-volt or a 230-volt (nominal) AC line
voltage source. The Power Mode switch on the rear of the
power supply converts the instrument from one operating
range to the other and also selects the other power modes
(see Table 2-1 for description of the Power Mode switch).
In the OPERATE 115V AC position of the Power Mode
switch, this instrument provides stable operation over a line
voltage range of 95 to 137 volts (without batteries). When
in the OPERATE 230V AC position, stable operation is
provided with line voltage variations between 190 and 274
volts. Stable operation is also provided for line frequencies
between 45 and 440 hertz. However for line frequencies
below 50 hertz, derate the upper line voltage limit linearly
to a maximum of 10%.at 45 hertz.
To convert this instrument from 115-volt to 230-volt
nominal AC operation, use the following procedure:
1. Disconnect the instrument from the power source.
2. Set the Power Mode switch for the desired line
voltage.
3. Change the line-cord power plug to match the power-
source receptacle or use a suitable adapter.
This instrument is designed to be used with a three wire
AC power system. If a three- to two-wire adapter is used to
connect this instrument to a two-wire AC power system, be
sure to connect the ground lead of the adapter to earth
(ground). Failure to complete the ground system may allow
the chassis to be elevated above ground potential and pose a
shoc hazard.
For AC operation, connect the AC power cord to the
AC portion of the power receptacle (see Fig. 2-3). Select
the nominal operating voltage and the power mode with the
Power Mode switch. More information on operation in the
CHARGE BATT 230V AC and CHARGE BATT 115V AC
positions is given under Battery Operation in this section.
DC Operation
This instrument can be operated from an external DC
source by connecting the DC power cord to the DC portion
of the power receptacle (see Fig. 2-3) and by setting the
Fig. 2-3. Portion of power receptacle used for AC and external DC
operation.
2-2

Operating Instructions—Type 422 AC-DC
Power Mode switch to the OPERATE 11.5 - 35V DC posi
tion. The DC power cord is supplied without an input con
nector. A suitable connector can be added to match the
power source, or the pigtail leads can be used as supplied.
Correct connections for the leads are as follows:
Green Earth (Ground)
White Negative DC
Blac Positive DC
WARNING
If this instrument is operated without the green lead
of the DC power cord connected to earth (ground),
the chassis is floating with respect to earth. Operation
with the green lead disconnected is not recommended
due to the potential shoc hazard produced if the
chassis becomes elevated with respect to earth.
The power input stage of the AC-DC Power Supply fea
tures a ground system which is isolated from chassis ground
for external DC operation in the OPERATE 11.5 - 35V DC
position. This feature allows the instrument to be operated
from DC voltages which are elevated up to 200 volts maxi
mum from chassis ground. Be sure the chassis remains con
nected to earth (ground) with the green lead of the DC
power cord for safety reasons.
When operated from an external DC source, stable oper
ation is provided over an input voltage range of 11.5 to 35
volts DC. Stable operation is provided with external DC
source voltage variations as long as the minimum instanta
neous DC voltage level does not go below 11.5 volts DC.
The internal battery charger circuit is inoperative for DC op
eration.
Battery Operation
Battery-Pac Installation. This instrument can be opera
ted from the internal batteries for completely portable op
eration through the use of the battery pac . Order the bat
tery pac from your local Te tronix Field Engineer or rep
resentative by Te tronix Part No. 016-0066-02. Use the
following procedure to install the battery pac :
1. For easy removal of the power supply, position the
instrument as shown in Fig. 2-4A.
2. Loosen and remove the four securing screws located
in the rear feet of the power supply (see Fig. 2-4B).
3. Separate the AC-DC Power Supply from the indicator
by sliding the power supply to the rear, off the support
rods.
4. Loosen and remove the battery box attaching screw
located below the fuse holders (see Fig. 2-4B).
5. Remove the battery box from the power supply.
6. Remove the four short bolts located in the battery-
pac securing holes (see Fig. 2-4B).
NOTE
The bolts removed in step 6 allow the Type 422 with
AC-DC Power Supply to meet the EMI specifications
given in Section 1 when the battery pac is not instal
led. These bolts are replaced with the screws to be
removed from the battery pac in step 8. If the in
strument is operated without the battery pac , re
place the bolts for minimum EMI radiation.
7. Lay the battery pac on a flat, non-conducting sur
face so it is resting on the interconnecting banana jac s and
the spring brac et. The cutout in the battery pac should
be positioned on the right side as shown in Fig. 2-4C.
8. Loosen and remove the four screws from the battery
pac (located near each corner; see Fig. 2-4C).
9. Slide the battery box over the battery pac (see Fig.
2-4D). The switch, connector and fuse holes in the battery
box should be located directly above the cutout in the
battery pac .
10. Install the four battery-pac screws removed from
the battery pac in step 8 into the battery-pac securing
holes located near the rear feet. Fig. 2-4B shows the lo
cation of these screws. Tighten the screws evenly and se
curely.
11. Install the complete battery box/battery pac as
sembly onto the rear of the power supply so the switch,
connector and fuses fit through the cutouts in the battery
pac and battery box (see Fig. 2-4E). Also guide the inter
connecting banana jac s so they mate with the banana
plugs on the power supply.
12. Replace the battery-box attaching screw removed in
step 4.
CAUTION
This screw is designed to hold the battery box and
power supply together during assembly. The securing
screws to be installed in step 14 hold the complete
power supply assembly to the indicator to produce a
rugged instrument. When handling the AC-DC Power
Supply when it is not installed on the instrument, be
careful to avoid placing too much strain on the switch
brac et by the weight of the battery pac .
13. Slide the power supply onto the four support rods
of the indicator (see Fig. 2-4F). The CRT of the indicator
must fit into the cutout in the AC-DC Power Supply.
14. Replace the four securing screws located in the feet
of the power supply. Tighten these screws evenly and se
curely.
15. Before operating the instrument from the batteries,
charge the batteries for at least 16 hours. Complete
charging information is given under Battery Charging.
2-3

Operating I nstructions—Type 422 AC-DC
Power-supply
securing screws
A. Correct position for easy removal of the AC-DC Power
Supply. B. Location of securing screws on rear of power supply.
D. Installing the battery box on the battery pac .
E. Installing battery assembly on the AC-DC Power Supply. F. Installing the AC-DC Power Supply on the indicator.
2-4
Fig. 24. Installing the battery pack in the AC-DC Power Supply.

Operating Instructions—Type 422 AC-DC
Battery Precautions. The nic el-cadmium battery cells
used in the AC-DC Power Supply have been selected as a
result of extensive evaluation. Each battery cell in the bat
tery pac has received an ampere-hour test, has met or
exceeded the minimum ampere-hour storage requirement
and has been rigidly inspected. The battery cells used in the
battery pac should provide a useful operating life extend
ing over several hundred charge-discharge cycles.
To extend the useful operating life of the nic el-
cadmium battery cells used in this instrument, observe the
following precautions.
1. Do not exceed the recommended charge rate as pro
vided by the AC-DC Power Supply.
2. Do not charge the battery pac at the full rate for
extended periods beyond the recommended charge time.
3. Excessive discharge of the battery pac after the
POWER light begins to blin may cause one or more of the
cells to reverse polarity. Although the cells are protected
against immediate damage, repeated polarity reversal will
shorten the useful life of the batteries.
4. Observe the temperature limits given in this manual
for battery charging, operation and storage.
Battery Operation. This instrument can be operated on
the internal batteries over an ambient temperature range of
—15° C to +40° C. However, the maximum operating time
and useful battery life is provided at about +25° C. Table
2-2 lists typical battery charge capacity with variations in
charge and discharge temperatures. For operation from the
internal batteries, set the Power Mode switch on the rear of
the AC-DC Power Supply to the OPERATE I NT BATT
position (be sure battery pac is charged). The POWER
switch on the front panel of the Type 422 controls the
power to the circuits in the instrument in the same manner
as for AC or DC operation.
TABLE 2-2
Typical Battery Charge Capacity
(referenced to charge-discharge at +20°C to +30°C)
Charge temperature Operating temperature
—15 C +20 C to +30 C +55 C
0°C 40% 60% 50%
+20 °C to +30 °C 65% 100% 85%
+40 °C 40% 65% 55%
When this instrument is connected to an AC line-voltage
source, the internal batteries can be recharged when the
Power Mode switch is set to the applicable CHARGE BATT
position (see Battery Charging). The battery charger circuit
is disconnected in the OPERATE I NT BATT position so
the instrument cannot be operated from the batteries while
the batteries are being charged. To simultaneously charge
the batteries and operate the instrument, use the OPER
ATE 230V AC or OPERATE 115V AC position (30 milli-
ampere tric le charge applied to batteries).
WARNING
When this instrument is operated from the internal
batteries, the chassis is floating with respect to earth
(ground). Connect the instrument to earth with a
jumper lead from the front-panel ground post. Opera
tion without this ground lead is not recommended
due to the potential shoc hazard produced if the
chassis becomes elevated with respect to earth.
When operating from the internal batteries, the POWER
light on the front panel of the indicator provides an indica
tion of the charge level on the internal batteries. When the
batteries have been discharged to near the minimum level
necessary for correct power supply regulation, the POWER
light begins to blin . Further discharge of the batteries be
yond this level not only provides inaccurate measurements,
but may also damage the batteries.
The following suggestions will aid in obtaining the maxi
mum operating time from the batteries:
1. Set the INTENSITY control only as far cloc wise as
is necessary to obtain a visible display. Due to the type of
CRT blan ing used in this instrument, the CRT emits elec
trons even though the sweep is not operating (also see dis
cussion on Intensity Control in this section).
2. Whenever the instrument is not to be used for periods
longer than about 1/2 hour, turn the POWER switch off
(pushed in). Since this instrument is completely solid-state
except for the CRT, it requires only about 30 seconds
warmup before it is operable and about five minutes warm
up to reach the specified accuracy.
3. Set the SCALE ILLUM control fully countercloc 
wise unless the graticule is not visible when ma ing a meas
urement. When scale illumination must be used, return the
SCALE ILLUM control to the fully countercloc wise posi
tion after the measurement.
Battery Charging. The battery pac of the AC-DC
Power Supply can be charged from either a 115-volt or
230-volt (nominal) AC line-voltage source. In the CHARGE
BATT 230V AC or CHARGE BATT 115V AC positions of
the Power Mode switch, the battery pac is charged at a
400 milliampere rate. In the OPERATE 230V AC or OPER
ATE 115V AC positions, the battery pac is tric le-charged
at about a 30 milliampere rate. A 16-hour charge period in
either of the CHARGE BATT positions should be sufficient
to charge the battery pac to its full potential. Although
the batteries may not be damaged immediately by longer
charge periods, repeated over-charging will shorten the use
ful life of the batteries. A full charge level can be main
tained on the battery pac by the 30 milliampere tric le
charge available in the OPERATE 230V AC or OPERATE
115V AC positions (POWER switch must be pulled out).
2-5

Operating Instructions—Type 422 AC-DC
The battery pac can be charged even when the AC-DC
Power supply is removed from the indicator if the Power
Mode switch is in the correct position and the POWER
switch is turned on at the power supply. This feature
provides a means of continuous operation from batteries if
more than one supply is available. It also provides a method
of tric le charging the battery pac without the instrument
in operation if the batteries must be stored for long periods
of time (Power Mode switch set to OPERATE 230V AC or
OPERATE 115V AC).
The battery pac can be charged over an ambient temp
erature range of —15° C to +40° C. However, the maxi
mum operating time and useful battery life is provided
when the batteries are charged and discharged at about
+25° C (see Table 2-2). Thermal cutouts in the AC-DC
Power Supply protect the battery pac from overheating
during charge time. The battery pac normally becomes
warmer as it reaches full charge potential. If the tempera
ture surrounding the battery pac exceeds the safe opera
ting level, a thermal cutout switches the charge rate from
the 400 milliampere full-charge to the 30 milliampere
tric le-charge rate. When the temperature returns to a safe
operating level, the thermal cutout returns the charge rate
to the 400 milliampere level. If the charge rate is reduced
for an extended period during a charge cycle, the battery
pac will not reach full charge in the recommended 16-hour
charge time. Therefore, do not assume battery pac failure
because of reduced operating time. Instead, recharge the
battery pac for 16 hours at a reduced ambient tempera
ture and then chec the operating time. If insufficient oper
ating time is still obtained, the battery pac is probably
defective (see Battery Pac Maintenance in Section 4 for
more information).
During normal usage or storage, the individual battery
cells in the battery pac acquire slightly different charge
characteristics. To provide the best overall operation and
maximum operating life, the charge on the individual bat
tery cells should be equalized periodically. This can be done
without damage to the battery cells by charging the batter
ies at the full charge rate for 24 hours (be sure ambient
temperature is low enough to prevent opening of the ther
mal cutout). This should be done after every 15 charge-
discharge cycles or every 30 days, whichever occurs first.
Battery-Pac Maintenance and Troubleshooting. Com
plete information on maintenance and troubleshooting of
the battery pac is given in Section 4.
Battery Pac Storage. The battery pac used in the AC-
DC Power Supply can be stored in a charged or a partially
charged condition. For best shelf life when storing the bat
tery pac for long periods of time, fully recharge the bat
tery pac about every three months. Although the battery
pac is fully charged when shipped from Te tronix, Inc.,
recharge the battery pac completely before operating the
instrument.
Charge retention characteristics of nic el-cadmium bat
teries vary with the storage temperature and humidity. The
battery pac may be stored at ambient temperatures be
tween —40°C and +60°C without damage, either in the
instrument or as a separate unit. However, the self-discharge
rate increases with ambinet temperature. For example, cells
stored at +20°C will lose about 50% of their stored charge
in three months but when stored at +50°C, they will be
almost completely self-discharged in only one month. High
humidity also increases the rate of self-discharge. If this
instrument must be stored at either high ambient tempera
ture or high humidity for an extended period of time, it is
recommended that the battery pac be continuously tric le
charged (charge battery pac completely at full-charge rate
before extended tric le charge).
The POWER light blin s to indicate when the battery
pac voltage is too low for continued measurement accura
cy. The batteries used in this instrument may be damaged
by excessive discharge. Therefore, the instrument should
not be operated from the battery pac after the POWER
light begins to blin , since such operation not only may
provide inaccurate measurements, but may also shorten the
useful life of the battery pac .
Operating the Power Supply Remotely.
The indicator can be operated with the power supply
removed for maintenance, calibration or special applica
tions. The interconnecting plug on the rear of the indicator
can be detached and used as an extension cable. To remove
the interconnecting plug, loosen the three secrews holding
it to the indicator and slide it up slightly; then move it
away from the rear of the indicator. Unwrap the power
cable from the rear of the indicator.
The two spring clips on the power supply circuit board
are provided to secure the power cable to the power supply
for remote operation. To use the clips, first be sure the
POWER switch is set to OFF at the power supply. Then,
hoo one spring clip into the hole provided in the intercon
necting plug (see Fig. 2-5). Slide the plug into place while
depressing the other spring clip. To remove the plug, reverse
the order in which it was attached.
CAUTION
Do not bend the spring clips so they latch without
using the procedure described here. Otherwise, they
will latch when the power supply is remounted on the
indicator and will be difficult to remove without
damage to the instrument.
When operating the power supply remotely, the POWER
switch on the front of the indicator is inoperative. The
POWER switch can be actuated at the power supply. The
ON and OFF positions of the switch are noted on the cir
cuit board.
Low-Batteries Indicator
2-6

Operating Instructions—Type 422 AC-DC
Fig. 2-5. Securing the power cable to the power supply for remote
operation.
Press in here on feofh
sides of the instrument to
position handle.
Fig. 2-6. Handle positioned to pro ide a stand for the instrument.
OPERATING TEMPERATURE
General
The Type 422 with AC-DC Power Supply requires very
little air circulation for proper operation. Thermal cutouts
in the indicator and the power supply provide thermal pro
tection and disconnect the instrument power if the inter
nal temperature exceeds a safe operating level. Power is
automatically restored when the temperature returns to a
safe level. The Type 422 with AC-DC Power Supply can be
operated where the ambient air temperature is between
—15°C and +55°C (+40°C maximum with battery pac
installed). This instrument can be stored in ambient temper
atures between ~55°C and +75°C (—40°C to +60°C with
batteries). After storage at temperatures beyond the opera
ting limits, allow the chassis to come within the operating
limits before power is applied.
Operating Position
The handle of the Type 422 can be positioned for carry
ing or as a tilt-stand for the instrument. To position the
handle, press in at both pivot points (see Fig. 2-6) and turn
the handle to the desired position. Several positions are
provided for convenient carrying or viewing. The instru
ment can also be set on the rear-panel feet either for opera
tion or storage.
CONTROLS AND CONNECTORS
General
A brief description of the function and operation of the
controls and connectors of the Type 422 follows. Fig. 2-7
shows the front panel of this instrument More detailed
information is given in this section under General Operating
Information.
Cathode-Ray Tube (CRT)
INTENSITY Controls brightness of display.
FOCUS Provides adjustment for optimum dis
play definition.
ASTIGMATISM Used in conjunction with the FOCUS
control to obtain a well-defined dis-
play.
SCALE ILLUM Controls graticule illumination.
Vertical (both channels if applicable)
VOLTS/DIV Selects vertical deflection factor in
1-2-5 sequence (VARIABLE control
must be in CAL position for indicated
deflection).
VARIABLE
UNCAL
POSITION
GAIN
Provides variable uncalibrated deflec
tion factors between the calibrated set
tings of the VOLTS/DIV switch.
Light indicates that VARIABLE
VOLTS/DIV control is not in the CAL
position.
Controls vertical position of the trace.
Screwdriver adjustment to set gain of
the vertical input amplifier.
m2-7

Operating Instructions—Type 422 AC-DC
CRT
Channel 1
Sweep
Triggering
Power and
External
Blan ing
Fig. 2-7. Front-panel controls and connectors.
STEP ATT BAL Screwdriver adjustment to balance the ALG ADD: Signals applied to INPUT
input amplifier in the .02, .05 and .1 1 and INPUT 2 connectors are al
positions of the VOLTS/DIV switch. gebraically added and the algebraic
sum is displayed on the CRT. The
INPUT Input connector for vertical deflection INVERT switch in Channel 2 al
signals. lows the display to be CH 1 + CH 2
orCH 1 -C H 2 .
Input Coupling Selects method of coupling input sig
(AC GND DC) nal to input amplifier.
AC: DC component of input signal is
CH 1: The signal applied to the IN
PUT 1 connector is displayed.
bloc ed. Low frequency —3 dB CHOPPED: Dual-trace display of
point is about two hertz. signals on both channels. Display
switched at a repetition rate of
GND: Input circuit is grounded (does
not ground applied signal). about 150 ilohertz.
CH 2: The signal applied to the IN
DC: Provides coupling for all signals
from DC to 15 megahertz or great PUT 2 connector is displayed.
er. ALT: Dual-trace display of signals on
both channels. Display switched be
Mode Selects mode of operation of vertical tween channels at end of each
(not labeled) input amplifiers. sweep.
2-8

Operating I nstructions—Type 422 AC-DC
j
INVERT Push-pull switch to invert the Channel
(CH 2 only) 2 display.
X I0 GAIN AC Push pull switch to increase AC gain of
(CH 2 only)
Calibrator
Channel 2 amplifier 10 times (de
creases deflection factor 10 times).
CALIBRATOR Output jac providing two-volt square-
wave signal for compensating probes.
Triggering
Source
(not labeled) Selects source of trigger signal.
CH 1 & 2: Internal trigger signal ob-
tained from displayed channel(s).
CH 1: Internal trigger signal obtained
only from Channel 1.
EXT: Trigger signal obtained from an
external signal applied to TRIG IN
connector.
Coupling Determines method of coupling trigger
(not labeled) signal to trigger circuit.
AC: Rejects DC and attenuates signals
below about 50 hertz. Accepts sig
nals between about 50 hertz and 15
megahertz.
SLOPE
LEVEL
AC LF REJ: Rejects DC and atten
uates signals below about 50 ilo
hertz. Accepts signals between TRIG IN
about 50 ilohertz and 15 mega
hertz. GATE OUT
DC: Accepts all trigger signals from
DC to 15 megahertz or greater.
Selects slope of trigger signal which
starts the sweep.
_ T : Sweep can be triggered from
positive-going portion of trigger
signal.
■ Sweep can be triggered from
negative-going portion of trigger
signal.
Selects amplitude point on trigger sig
nal at which sweep is triggered.
Ground
(not labeled)
Sweep
POSITION
X I0 MAG
TRIGGERING Push-pull switch, actuated by the TIME/DIV
Mode LEVEL control, which determines the
(not labeled) triggering mode.
AUTO (pushed in): Sweep initiated
by the applied trigger signal at
point selected by the LEVEL con
trol when the trigger signal repetit
ion rate is above about 20 hertz (or
above lower limit of frequency
range selected by TRIGGERING
Coupling switch). Triggered sweep
can be obtained only throughout
amplitude range of applied trigger
signal. When the LEVEL control is
outside the amplitude range, when
the trigger repetition rate is below
the lower frequency limit or when
the trigger signal is inadequate, the
sweep free runs at the sweep rate
selected by the TIME/DIV switch
to produce a reference trace.
NORM (pulled out): Sweep initiated
by the applied trigger signal at
point selected by the LEVEL con
tro l throughout the frequency
range selected by the TRIGGER
ING Coupling switch. Triggered
sweep can be obtained only
throughout amplitude range of ap
plied trigger signal. When the LEV
EL control is outside the amplitude
range, when the trigger repetition
rate is outside the frequency range
selected by the TRIGGERING
Coupling switch or when the trigger
signal is inadequate, there is no
trace.
Input connector for external trigger
signal.
Output connector providing a nega
tive-going rectangular pulse which is
coincident with the sweep.
Binding post to establish common
ground between the Type 422 and the
associated equipment.
Controls horizontal position of dis
play.
Push-pull switch to increase sweep rate
to 10 times setting of TIME/DIV
switch by horizontally expanding the
center division of the display.
Selects sweep rate of the sweep genera
tor (VARIABLE control must be in
CAL position and X I0 MAG switch
pushed in for indicated sweep rate). In
the EXT HORIZ position, horizontal
deflection is provided by a signal con
nected to the HORIZ IN connector.
2-9

Operating Instructions—Type 422 AC-DC
VARIABLE
UNCAL
HORIZ ATTEN
(LEVEL)
HORIZ IN
(TRIG IN)
Power and External
POWER
EXT BLANK
ING
Rear-Panel
Power Mode
(see Fig. 2-2)
Provides uncalibrated sweep rates be
tween the calibrated settings selected
by the TIME/DIV switch. The sweep
rate in each TIME/DIV switch position
can be reduced to at least the sweep
rate of the next adjacent position to
provide continuously variable sweep
rates from 0.05 microsecond/division
(X I0 MAG switch pulled out) to 1.25
seconds/division.
Light indicates that VARIABLE
TIME/DIV control is not in the CAL
position.
Provides approximately 10:1 attenua
tion for external horizontal signals
connected to the HORIZ IN connector
when the TIME/DIV switch is set to
EXT HORIZ.
Input connector for external hor
izontal signal when TIME/DIV switch
is set to EXT HORIZ.
nal DC source. Indicator operable
but no charging is provided for bat
tery pac .
OPERATE INT BATT: Provides in
strument operation from internal
battery pac . Indicator operable
but battery pac cannot be charged
in this switch position.
OPERATE 115V AC: Provides
instrum ent operation from a
115-volt nominal AC line voltage
source. Indicator operable and a 30
milliampere tric le charge is applied
to battery pac .
CHARGE BATT 115V AC: Used
when AC line voltage applied to in
strument is 115 volts nominal.
Charges internal battery pac at a
400 milliampere rate when POWER
switch is on. Indicator does not
operate in this switch position.
Blan ing
Light: Indicates that POWER switch
is on and power is available. For the
OPERATE INT BATT position of
the Power Mode switch, the
POWER light blin s to indicate that
the batteries are discharged too far
for continued operation.
Switch: Push-pull switch to control
power to the instrument.
FIRST-TIME OPERATION
General
The following steps demonstrate the use of the controls
and connectors of the Type 422. It is recommended that
this procedure be followed completely for familiarization
with this instrument.
Setup Information
1. Set the front-panel controls as follows:
Input connector for external blan ing
signals.
Selects the operating power mode.
CHARGE BATT 230 V AC: Used
when AC line voltage applied to in
strument is 230 volts nominal.
Charges internal battery pac at a
400 milliampere rate when POWER
switch is on. Indicator does not
operate in this switch position.
OPERATE 230V AC: Provides instru
ment operation from a 230-volt
nominal AC line voltage source. In
dicator operable and a 30 milli
ampere tric le charge is applied to
battery pac .
OPERATE 11.5-35 V DC: Provides
instrument operating from an exter-
Vertical controls (both channels where applicable)
VOLTS/DIV
VARIABLE
Input Coupling
POSITION
Mode
INVERT
X I0 GAIN AC
Triggering Controls
Source
Coupling
SLOPE
Mode
LEVEL
Horizontal controls
POSITION
TIME/DIV
VARIABLE
X I0 MAG
CALIBRATE 4 DIV
CAL
GND
Midrange
CH 1
Pushed in
Pushed in
CH 1 and 2
AC
Positive going (J~)
AUTO
Midrange
Midrange
.5 mSEC
CAL
Pushed in
j
2-10