Tektronix 535A Service manual

TEKTRONIX IN C P.O. BOX 831 PORTLAND 7. OREGON

Copyright © 1959 by Tektronix,
Inc, Portland, Oregon. Printed in
the nited States of America. All
rights reserved. Contents of this
publication may not be reproduced
in any form without permission of
the copyright owner.
INTROD CTION
The following pages provide a
rapid means of setting the controls
of your Tektronix Type 535A or
Type 545A Oscilloscope. This infor
mation is designed to give you
not only control settings for specific
applications but also various func
tions of these controls during differ
ent operational procedures.
An important part of this book
covers "triggered operation of the
oscilloscope. Here, some "trigger
ing" signal starts the horizontal
trace across the screen, beginning
at the left hand side of the grat
icule For present purposes, thon,
■'triggering" can be taken as synon
ymous with starting the horizontal
sweep of the trace.
w> * / msa-i

CONTENTS
Probe Adjustment . ..............................................
Charocteristics of Plug-In and
Type 535A-545A Combinations ................
Selecting tho Triggering Signal ....................
Triggered Operation: A TOMATIC MODE .
Triggered Operation: AC MODE . ........
Triggered Operation: DC MODE ................
Triggered Operation: AC, LF REJECT MODE
Triggered Operation:
sing the Type CA Plug-In nit ...................
Synchronized Operation: HF SYNC MODE .
Free Running Sweep Operation ......................
Delayed Trigger Operation ...........................
Delayed Sweep Operation ...........................
Delayed Sweep Expanded ..............................
Single Sweeps: Manual Operation ..............
Single Sweeps: Triggered Operation ..........
External Sweep Operation ..........................
sing the Variablo STABILITY Control ........ .
Possible Causes for Lack of Trace ................
Operating Description of Controls
and Connectors ...........................................
1
2
3
4
6
8
10
12
14
16
17
18
20
22
24
26
28
29
30
soia/s+sa-i

BEFORE SING PROBE
ALWAYS CHECK ITS ADJ STMENT
PROBE ADJ STMENT
An adjustable capacitor in the probe body compcnsales
for variations in input capacitance from one instrument to
another, so that your pulse and transient measurements will
be accurate Touch the probe tip to the oscilloscope cali
brator output connector and adjust the oscilloscope controls
to display several cycles of the waveform. Adjust the probe
capacitor for a flat top on the calibrator square wave.
S3£AA-lbA- 1

CHARACTERISTICS OF PLUG-IN
AND TYPE 535A/TYPE 545A COMBINATIONS
For the complete list of specifications, including risetime
and input capacitance, see the instruction manual for the
instrument involved.
PL G-IN DEFLECTION FACTOR
(Calibrated) BANDPASS
535A/545A
TYPE A .05 v/cm to 20 v/cm dc to 14 mc/20 me
TYPE B .05 v/cm to 20 v/cm dc to 14 me/12 me
TYPE B 5 mv/cm to .05 v/cm 2 c to 10 mc/dc to 20 me
TYPE CA*
TYPE Dt .05 v/cm to 20 v/cm
1 mv/cm to 50 v/cm dc to 15 mc/24 me
dc to 2 me
TYPE Et 50/tv/cm to lOmv/cm .06 c to 60 kc
TYPE G t .05 v/cm to 20 v/cm dc to 14 mc/20 me
TYPE H 5 mv/cm to 20 v/cm dc to 11 me/15 me
TYPE K .05 v/cm to 20 v/cm dc to 15 mc/30 me
TYPE L 5 mv/cm to 2 v/cm 3 c to 15 mc/24 me
TYPE L .05 v/cm to 20 v/cm dc to 15 mc/30 me
’ Dual-Trace or Single-Traco Differential.
? Differential Input Available.
kWMu-1 j
SELECTING THE TRIGGERING SIGNAL
To trigger the sweep from the waveform being observed,
set the block TRIGGER SLOPE sw.tch to -f INT. or —INT.
2. To trigger the sweep from the power-line wave (to ob
serve a waveform having a lime relationship to the power-
line wave), set the black TRIGGER SLOPE SWITCH to -f
LINE or -LINE
3. To trigger the sweep from an external waveform which
has a time relationship to tho observed waveform, connect
the triggering wave to the appropriate TRIGGER INP T
connector, and set the black TRIGGER SLOPE switch to
+EXT or EXT.
A. If you want the start of the display to occur at a time
when the triggering signal is rising (has a positive slope),
use the -f positions of the black TRIGGER SLOPE switch.
To start the display at a time when the triggering signal is
falling (has a negative slope), use the positions of Ihe
block TRIGGER SLOPE switch.
33Sa/&4&A-I 3

TRIGGERED OPERATION
A TOMATIC MODE
For periodic signals
60 cycles lo 2 megacycles
This mode i» porticularly useful when changing the input
connection from one point in the circuit to another. It pro
vides a trace with or without a triggering signal.
CONTROL POSITION PAGE*
HORIZONTAL DISPLAY A or B 30
TRIGGERING MODE A TO. 31
TRIGGER SLOPE t +IN T or — INT 31
STABILITY NOT SED 31
TRIGGERING LEVEL NOT SED 32
’ Refer» lo description of the control function in this book,
tS ee page 3.
Set the appropriate TIME/CM switch for the desired lime
base and the red VARIABLE knob to CALIBRATED. If the
waveform does not appear, refer to page 29.
u m /mA' i 4
HORIZONTAL DISPLAY ■ lif
In this mode, the red STABILITY knob and the black
TRIGGERING LEVEL control need no adjustment Each
sweep is triggered at the average-voltage point on the
waveform.
•-x a /z^z a - I 5

TRIGGERED OPERATION
AC MODE
For transient or periodic signals
IS cycles to 5 megacycles
This modo is particularly useful for low-frequency signals.
It provides a trace only when a triggering signal occurs.
CONTROL POSITION PAGE*
HORIZONTAL OISPLAY A or B 30
TRIGGERING MODf
---------- .— . ------------ - — — --------
AC 31
TRIGGER SLOPE f + IN T or — INT 31
STABILITY J PRESET 31
TRIGGERING LEVEL Full lof» or right 32
•Rofer* lo description of the control (unction in Shift book.
1See poge 3.
| Click the r*d STABI TY knob M l loll (o PRESET.
1 Set the block TIME/CM switch for tho dosired TIME BASE
and the red VARIABLE knob to CALIBRATED.
2. Turn the black TRIGGERING LEVEL CONTROL slowly
toward the center of its range for a stable display.
If the waveform does not appear, refer to Page 29.
\h a A-.i « i £
In this mode, the black TRIGGERING LEVEL control deter
minos the height on the waveform at which the trace wit
s’arl Triggering is unaffected by the dc components of the
triggering signal or by the VERTICAL POSITION canltol
STAOUTY
HORIZONTAL OISPLAY met
TIME BASE
Atft'OG
wrui
7

TRIGGERED OPERATION
DC MODE
For transient or periodic signals
DC to 5 megacycles
This mode is particularly usoful for signals that change
slowly, signals below the lower frequency limit of the AC
MODE.
CONTROL POSITION PAGE*
HORIZONTAL DISPLAY A o r B 30
TRIGGERING MODE DC 31
TRIGGER SLOPE f + IN T or — INT 31
STABILITY ± PRESET 31
TRIGGERING LEVEL Full fl or right 32
’ Rofen lo deioiption of th« control function in ihi» book,
t Sec page 3.
1 Click tho red STABILITY knob full left lo PRESET.
1. Set the appropriate TIME/CM switch for tho desired time
base, and the red VARIABLE knob to CALIBRATED.
2. Turn the black TRIGGERING LEVEL control slowly toward
the center of its range for a stable display. Final sotting
of this control will depend upon the VERTICAL POSITION
control. If the display is positioned to the top or bottom
of the graticule, the TRIGGERING LEVEL control will be set
to either side of the mid-iongc position. If the waveform
does not appear, refer to page 29.
uia/mM'I 8
In this mode, the black TRIGGERING LEVEL control deter
mines the point on the triggering waveform where triggering
of the sweep occurs. Tho trace always starts at a given
point on the graticule for a given TRIGGERING LEVEL
control setting.
v*.*A«ca-i9

TRIGGERED OPERATION
AC, LF, REJECT MODE
For fromronf or periodic signals,
0 kilocycles lo 5 megacycles
This mode is particularly useful for eliminating undesir
able low-frequency components in the triggering signal.
CONTROL POSITION PAGE*
HORIZONTAL DISPLAY A or B 30
TRIGGERING MODE AC, LF REJECT 31
TRIGGER SLOPE f + IN T or — INT 31
STABILITY $ PRESET
TRIGGERING LEVEL Full loft or right 32
‘ Refer* to description of the control function In this book,
t See page 3.
t Click the red STABILITY knob full left lo PRESET.
1. Set the block TIME/CM switch for the desired time base
and the red VARIABLE knob to CALIBRATED.
2. Turn I he black TRIGGERING LEVEL control slowly to
ward the center of its range for a stable display.
If the waveform does not appear, refer to Page 29.
m a /io a -i 10
This mode Is principally for use with a dual-troco plug-in
unit. However, it may be useful for reducing jitter due to
hum in Ihc Triggering-' signal.
n

TRIGGERED OPERATION
SING THE TYPE CA PL G-IN NIT
For transient or periodic signals,
JO kilocycles to 5 megacycles
Dual-trace operation is possible with the Type CA PL G
IN NIT. In the ALTERNATE position, two traces may be
displayed alternately. In the CHOPPED position, two traces
may bo displayed simultaneously.
CONTROL POSITION PAGE*
HORIZONTAL DISPLAY A or B 30
TRIGGERING MODE AC. LF REJECT 31
TRIGGER SLOPE f +IN T or — INT 31
STABILITY % PRESET 31
TRIGGERING LEVEL Full left or right 32
* Retort to description of the control function in this book,
t See page 3.
t Click the red STABI TY knob full loft to PRESET.
Connect the source of the waveforms to the CHANNEL
A and the CHANNEL B connectors on the plug-in, and place
the MODE switch in the desired position.
2. Set the black TIME/CM switch for the desired time base
and the red VARIABLE knob to CALIBRATED.
3 Turn the black TRIGGERING LEVEL control slowly to
ward the center of its range for a stable display.
If the waveform does not appear, refer to page 29.
ocmiotran
Two waveforms dis
played with ihc Typo
CA Plua-!n nit. The
MODE switch is set at
the ALTERNATE posi
tion.
13