Tektronix 442 User manual

INSTRUCTION MANUAL

BEFORE READ I NG— THIS MANUAL REPRINTED JULY 1980
PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAL.

Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077
070-2373-00

TEKTRONIX,.
INSTRUCTION MANUAL
Serial Number ———______ First Printing AUG 1977

WARRANTY
Tektronix warrants that this product is free from defects in materials and workmanship. The
warranty periodis one (1) year from the date of shipment. Tektronix will, at its option, repair or
replace the product if Tektronix determines it is defective within the warranty period andif itis
returned, freight prepaid, to a service center designated by Tektronix.
Tektronix is not obligated to furnish service under this warranty:
a. to repair damage resulting from attempts by personnel other than Tektronix
representatives to install, repair, or service the product;
b,
to
repair
damage
resulting
from
improper
use
or
from
connecting
the
product
to
incompatible equipment;
c. if personnel other than Tektronix representatives modify the hardware or software.
There
is
no
implied
warranty
of
fitness
for
a
particular
purpose.
Tektronix
is
not
liable
for
consequential
damages.
Copyright © 1977 Tektronix, Inc. All rights reserved. Contents of this publication
may
not
be
reproducedin
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
fez
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.

_—_-_roro|
ll
e+
‘
TABLE
OF
CONTENTS
LIST OF ILLUSTRATIONS ........ bene neee
LIST OF TABLES........ seen e cert eens
BEFORE OPERATION
Introduction... 0.0... cee tee ee eens
Safety Information .......... 00.0002 eee
Operating Voltage... . 2... 0. eee ee ees
Power Operation. ........0 ccc eee euee
Fuse Information ..........0. 000008.
LOCATION AND OPERATION OF EXTERNAL
CONTROLS, CONNECTORS, AND INDICATORS
Introduction...
2.2...
eee
eee
ee
eee
ee
Crt
Display
and
Power
...........6--000-
External
Blanking...
0.0...
02
eee
eee
eee
Power
Selectors
and
Dc
Balance............
@
Page
Page
eee
ii
LOCATION
AND
OPERATION
OF
EXTERNAL
CONTROLS,
CONNECTORS,
AND
INDICATORS
(cont)
nee
NL
7
Horizontal...
2...
cc
ew
ee
eee
ccs
10
Triggering
..
2...
cc te
ee
ee
ets
1
weal
weed
BASIC
OSCILLOSCOPE
OPERATION
ceed
Preliminary
........
0c
cee
eee
ee
eee
eees
14
reed
Signal
Ground.
.......
00
cee
eee
ee
eee
14
reed
Input
Coupling
Capacitor
Precharging.........
14
Operators
Adjustments
and
Checks.............
15
Probe
Compensation
.........00.00000008
15
Vertical
Gain
Check...
0...
0.
cee
eee
eee
15
Basic
Timing
Check...
..
2.000220
cee
ccees
15
|
Normal
Sweep
Operation
............
0000s
16
|
Applications.........
020
c
cece
ener
cece
17
...
6
Peak-to-Peak
Voltage
Measurements
..........
17
~+.
6
Instantaneous
Voltage
Measurements—Dc
......
19
442
Operators
i>

TABLE OF CONTENTS (Cont.)
Page
BASIC OSCILLOSCOPE OPERATION
Comparison Measurements ............200¢ 20
Time Duration Measurements .............0- 23
Frequency Measurement. ..........0.00005 24
Rise Time Measurements.......------..--- 25
Time Difference Measurements ............. 27
Multi-Trace Phase Difference Measurements..... 28
X-Y Phase Measurement............0000005 30
442 Operators

LIST
OF
ILLUSTRATIONS
——
RwWnh-=
Fig.
No.
Page
Fig.
No,
Page
442
Oscilloscope...
0.0
eee
ee
eee
iv
10
Probe
compensation.
........
0.000200
eee
ee
15
Power
switches
on
bottom
.....5---
52
e+e
ee
2
11.
Display
of
0.5PROBE
ADJ
output
signal.......
17
Line
fuse
location
on
Rear Panel
..........2-5
3
12
Measuring
peak-to-peak
voltage
of
a
waveform
...18
CRT
DISPLAY
and
POWER
front
panel
13
Measuring
instantaneous
dc
voltage
with
respect
ee
controls
and
indicators...
.
2.0...
ee
eee
en
4
to
a
reference
voltage...
2...
2.
eee
ee
ee
eee
19
|
External
Z-AXIS
input
on
Rear
Panel.,,.......
6
14
Measuring
the
time
duration
between
points
Controls
through
bottom
of
cabinet.
..........
7
on
awaveform
....--..02-2
02sec
eee
eee
24
Vertical
system
controls...
0...
..0
05
ce
eee
ee
9
15
Measuringrisetime
......-...2.02
22s
eee
26
Horizontal
system
controls,
.........0
cue
ee
10
16
Measuring
time
difference
between
two
pulses
.
.
.28
Triggering
system
controls...
......00.-0045
11
17
Measuring
phase
difference
................
29
18
Phase
difference
measurement
from
an
[
Peep rage eect 7
|
|
|
oaononou
LIST OF TABLES
Table No. Page
1
Ac
Regulating
Ranges...........-
0000
e
eee
2
2
Ac Fusing
.......
0000 e
ee ee eee
ee eens
3
3 Rise Time Measurements..............000- 25
@
442
Operators
ili

Fig. 1. 442 Oscilloscope
442 Operators
_—_—,

BEFORE
OPERATING
INTRODUCTION
The Tektronix 442 Oscilloscope is a 35 MHz maximum
bandwidth instrument with dual trace capability. A dual
trace dc to 35 megahertz vertical system provides calibrated
deflection factors from 2 millivolts/division to 10 volts/
division. Trigger circuits provide stable triggering over the
full vertical bandwidth. A horizontal deflection system pro-
vides calibrated sweep rates from 0.5 second/division to
0.1 microsecond/division. An X10 magnifier circuit (push-
button switch) extends maximum sweep to 10 nanoseconds/
division. In X-Y mode of operation, vertical and horizontal
deflection factors are the same as vertical amplifiers.
SAFETY INFORMATION
The 442 Oscilloscope is designed to be operated from a
single phase power source which has one of its current car-
rying conductors at ground potential (earth ground).
Operation
from
other
power
sources
where
both
current
carrying conductors are live with respect to ground (such
as phase-to-phase, a multi-phase system, or across the legs
of a 117-234 V single-phase three-wire system) is not re-
commended because only the Line Conductor has over-
current
(fuse)
protection
within
the
instrument.
Each instrument is provided with a three-wire power
cord with a three-terminal, polarized plug for connection
to power source. The grounding terminal of the recep-
tacle is directly connected to the instrument chassis and
cabinet as recommended by national and international
safety codes. Color coding of cord conductors follows the
1.E.C. which specifies: Line, brown; Neutral, blue; Safety
Earth or Ground, green with a yellow stripe (or solid
green).
OPERATING VOLTAGE
Power Operation
The 442 operates from either 120 V or 240 V ac input —
at 48 to 62 Hz. Selection of input function is made with
screwdriver adjusted switches accessible through bottom
of cabinet (see Fig. 2). Adjustment for high or low power
input can be made with same tool at same cabinet position.
@
442
Operators
1

Do not plug instrument into power source until
the following settings are made or checked.
Set the Line Voltage Selector switch to the nominal line
voltage available (see Fig. 2).
Set the Regulating Range Selector Switch (see Fig. 2)
so expected line-voltage fluctuations remain within the
Regulating Range selected (see Table 1).
Table 1
Ac Regulating Ranges
Regulating Regulating Range
Range Selector 240 V
Switch
Position
Nominal
108 to 132 V RMS| 216 to 250 V RMS
90 to 110 V RMS| 198 to 242 V RMS
HI
LO
2
442
Operators
Fig. 2. Power switches at bottom.

POWER
SWITCHES

—_>
Fuse Information
The 442 contains a power fuse located in a fuseholder
on the Rear Panel (see Table 2 and Fig. 3).
Fig. 3. Line fuse location on Rear Panel.
Dangerous potentials exist at several points
throughout this instrument. Qualified person-
nel, only, are authorized to remove cabinet.
442
Operators
Table 2
Ac Fusing
Fused Line F700
120 V ac 0.75 A Fast Blow
240 V ac 0.30 A Slow Blow

CAUTION
arn ie wt
LINE FUSE
HOLDER
2373-3

LOCATION
AND
OPERATION
OF
EXTERNAL
CONTROLS,
CONNECTORS
AND
INDICATORS
INTRODUCTION
(2)
INTENSITY
Turn control clockwise to increase display brightness.
Set for lowest visible display to prolong crt life.
The following information will familiarize an operator
with location and operation of external controls, con-
nectors and indicators. These controls, connectors, and
indicators are accessible from outside the instrument with
its cabinet in place. All other controls are internal and
should not be adjusted except during instrument cali-
bration and service. Procedures and suggestions for cali-
bration and maintenance are presented in the 442 Service
Manual.
CRT DISPLAY AND POWER
(Front Panel. See Fig. 4)
a) ASTIGmatism
Recessed
screwdriver
control
adjusts
crt
writing
beam
Fig.
4.
CRT
DISPLAY
and
POWER
front panel
controls
and
for
optimum
definition.
indicators.
4 442 Operators @
—_—
”

{
/
.
[
|
(3) FOCUS
Provides optimum display definition.
G) BEAM FINDER
Spring-loaded push-button switch to locate off-
screen displays. When engaged crt display is electrically
compressed to within graticule area independently
of position controls or applied signals. To locate an
off-screen display:
a. Set vertical POSITION and INTENSITY controls
to midrange and rotate horizontal POSITION control
clockwise.
b. If a display or dot still is not visible, press BEAM
FINDER and hold in. A compressed display or dot
should appear. If not, increase INTENSITY until a
display appears.
If a dot or vertical line appears, the sweep is not trig-
gered. Set trigger MODE switch to AUTO and obtain
a display. Center the display with vertical and hori-
zontal POSITION controls. Release BEAM FINDER
push button and adjust trigger LEVEL control for a
stable display.
After releasing BEAM FINDER, adjust VOLTS/DIV
switch, horizontal, and vertical POSITION controls
for a readable, stable display.
Gs) TRACE ROTation
Recessed screwdriver adjustment aligns crt trace with
horizontal graticule line.
(6
)oN
Indicator
(LED)
Lights when the power is on.
(7)ON-OFF Push Button Switch
Turns instrument on (in) and off (out).
internal Graticule
Eliminates parallax. Risetime, amplitude and
measurement points are indicated at the left of
graticule.
(9) PROBE ADJust
Pin connector supplies internally generated square
wave of approximately 0.5 volts at approximately
1 kHz for use in checking attenuation factors and
compensation of probes.
442
Operators
5