Tektronix 475 User manual

TEKTRONIX

475
OSCILLOSCOPE
AND
DM43 / DM40
DIGITAL
MULTIMETERS
Tekt ronix , Inc.
P.O. Box 500
Beavert on , Oregon
97077 INSTRUCTION
MANUAL
070-1739-01
Serial Num ber
First
Print ing
OCT
1974

WARRANTY
1
All
TEKTRONIX
inst rum ent s are
warranted
against
defect ive
m at erials
and
work m anshi p for one year .
Any quest ions with respect to the warranty should
be taken up with your TEKTRONIX Field Engineer or
representat ive .
All request s for repairs and replacem ent part s
should be direct ed to the TEKTRONIX Field Office
or representat ive in your area . This will assure you
the fast est
possible service
. Please include
the
inst rum ent Type Num ber or Part Num ber and Serial
Num ber with all request s for part s or service .
Specificat ions and price change privileges reserved .
Copyright  1974 by Tekt ronix , Inc. , Beavert on ,
Oregon
.
Print ed in the United
States of
Am eri ca . All
right s reserved . Content s of this publication m ay not
be reproduced in any form without perm i ssi on of
Tekt ronix
,
Inc.
U.S.A. and foreign TEKTRONIX product s covered
by U.S. and foreign patents and / or patents pending .
TEKTRONIX is a regi st ered t radem ark of Tekt ronix ,
Inc.

TABLE OF CONTENTS
BEFORE OPERATING
Page
BASIC
OSCILLOSCOPE
DISPLAYS ( cont
)
Page
INTRODUCTION
1
DELAYED
SWEEP
DISPLAY
17
SAFETY INFORMATION
1
MIXED SWEEP
DISPLAY
18
OPERATING VOLTAGE
2
X - Y DISPLAY
18
OPTIONS
3
SINGLE
SWEEP
DISPLAY
19
CONTROLS ,
CONNECTORS
AND INDICATORS
DM43
/
DM40 DISPLAYS
AND
MEASUREMENTS
VERTICAL
4
RESISTANCE
20
DISPLAY
6
VOLTS
22
DM43 / DM40
6
TEMPERATURE ( DM43 ONLY )
24
TRIGGER
8
APPLICATIONS
AND
MEASUREMENTS
HORIZONTAL , CALIBRATOR , AND POWER
12
PRELIMINARY
28
29
REAR PANEL
14
OPERATOR’S ADJUSTMENTS AND CHECKS
SIDE PANEL
15
PEAK
- TO
-
PEAK VOLTAGE
MEASUREMENTS
-AC
31
BASIC OSCILLOSCOPE DISPLAYS
INSTANTANEOUS
VOLTAGE
MEASUREMENTS
-DC
NORMAL SWEEP DISPLAY
16
32
MAGNIFIED SWEEP DISPLAY
17 ALGEBRAIC
ADDITION
34
REV . B , SEPT 1974
475 and
DM43
/
DM40
Operat ors
i

TABLE OF CONTENTS ( cont )
APPLICATIONS
AND
MEASUREMENTS ( cont )
Page
APPLICATIONS
AND
MEASUREMENTS ( cont
)
Page
COMMON - MODE REJECTION
35
DM43 / DM40
DELAYED
OR
MIXED
SWEEP TIME MEASUREMENTS
48
AMPLITUDE
COMPARISON
MEASUREMENTS
36
TIME
DURATION
MEASUREMENTS
37
Tim e Difference Between Repetit ive
Pulses
(
DM43
/
DM40
)
48
FREQUENCY MEASUREMENTS
38
49
RISETIME MEASUREMENTS
39
Tim e Duration ( DM43 / DM40 )
Frequency ( DM43 / DM40 )
50
40
Tim e Difference
Between
Two
Pulses
From
Different
sources
( DM43 /
DM40 )
51
TIME - DIFFERENCE BETWEEN TWO
PULSES FROM DIFFERENT SOURCES
TIME COMPARISON MEASUREMENTS
BASIC 475 DELAYED OR MIXED
SWEEP TIME MEASUREMENTS
41
Riset im e
(
DM43 / DM40
)
52
Mix ( DM43 /
DM40 )
53
42
DELAYED OR
MIXED SWEEP MAGNIFICATION
53
42
Magnified
Sweep
Start s
Aft er
Delay
53
43
Triggered Delayed Sweep Magnification
55
44
Tim e
Difference
Between
Repetit ive
Pulses (
Basic 475 )
Tim e Duration Measurem ent s ( Basic 475 )
Frequency
(
Basic
475 )
Tim e Difference Between Two Pulses From
Different sources ( Basic 475 )
Riset im e (
Basic
475
)
Mix (
Basic 475 )
PHASE DIFFERENCE
MEASUREMENTS
56
45
HIGH RESOLUTION PHASE
DIFFERENCE MEASUREMENTS
47
57
48
PULSE JITTER MEASUREMENTS
58
ii
475
and
DM43
/
DM40
Operat ors
REV . B. SEPT 1974

TABLE OF CONTENTS ( cont )
OPERATOR’S SPECIFICATIONS Page
OPERATOR’S
SPECIFICATIONS ( cont
) Page
VERTICAL
59
TEMPERATURE
- DM43 ONLY
, WITH
PROBE
63
TRIGGERING
60
DC VOLTAGE DM43 / DM40
63
AC
POWER SOURCE
64
60
DIFFERENTIAL TIME
MEASUREMENT ( BASIC 475 )
DIFFERENTIAL TIME
MEASUREMENT ( DM43 / DM40 )
ENVIRONMENTAL
64
61
ACCESSORIES
HORIZONTAL
61
STANDARD
ACCESSORIES
INCLUDED
65
CALIBRATOR
61
OPTIONAL
ACCESSORIES
65
Z - AXIS INPUT
62
OUTPUTS
62
OPTIONS
RESISTANCE
DM43 / DM40 62
OPTION 4
66
TIME DM43 / DM40
62
OPTION 7
66
iii
REV . B , SEPT 1974 475 and
DM43
/
DM40
Operat ors

om
B
417
REST
i
1739-1
1739-2
Basic
475
Oscilloscope
. 475 Oscilloscope with DM 43 digit al m ult im eter .
475 and
DM43
/
DM40
Operat ors
REV . B , SEPT 1974

BEFORE OPERATING
INTRODUCTION The
DM40 is
identical to the
DM43
,
except
that the
DM40 lacks t em perat ure m easurem ent capabilit y .
SAFETY INFORMATION
The
Tekt ronix 475
Oscilloscope
is a
dual -
channel
,
port able inst rum ent . The dual - channel dc - to - 200 MHz
vert ical syst em provides calibrat ed deflection fact ors from
2
m illi volts
to
5 volt s /
division
. The
sweep
trigger
circuit s
are capable of stable triggering over the full bandwidt h
capabilit ies of the vert ical deflection syst em . The horizon
tal deflection syst em provides calibrat ed sweep rat es from
0.5 second to 0.01 m icrosecond / division along with
delayed sweep features for accurat e relat ive - t im e
m easurem ent s . A X10 m agnifier ext ends the calibrat ed
sweep rat e
to 1
nanosecond
/ division
. The
inst rum ent
operat es over
a wide
variat ion of line
volt ages and
frequencies . Maxi m um power consum pt ion is about 100
wat ts .
The
inst rum ent
is
designed to
operat e from a
single
phase power source with one of the current - carrying
conductors ( the Neutral Conduct or ) at ground ( eart h )
pot ent ial . Operat ion from power sources where bot h
current - carrying conductors are live with respect to
ground ( such as phase - to - phase on a three - wire syst em )
is not recom m ended , since only the Line Conduct or has
over - current ( fuse ) prot ection within the inst rum ent .
The Tekt ronix DM43 Digit al Muli tm eter m easures o
ohm s to 20 m egohm s , dc volt s to 1200 dc volt s ( + or - ) or
-55  C to + 150  C and displays the m easurem ent on a
digit al display while the oscilloscope operat es norm ally .
The digit al m ult im eter and oscilloscope com bine to
provide a digit al readout of the t im e between any two
poi nt s on the
oscilloscope display .
The inst rum ent has a three - wire power cord with a
three - t erm i nal polarized plug for connection to the power
source and safety - eart h . The ground ( eart h ) t erm i nal of
the plug is direct ly connected to the inst rum ent fram e . For
elect ric - shock prot ection , insert this plug only in a m at ing
outlet with a safety - eart h contact .
REV . B , SEPT 1974
475 and
DM43 / DM40
Operat ors
1

OPERATING VOLTAGE
To
change the
regulating
range
:
1. Disconnect the inst rum ent from the power source .
CAUTION
2. Loosen the two captive screws that hold the cover
on the select or assem bly ; then pull to rem ove the cover .
Thi s inst rum ent m ay be dam aged if operat ed with
the line volt age select or switch or the regulating
range select or set for the wrong applied line volt age
or if the
wrong line
fuse is
used
.
3. Pull out the range select or switch bar ( see Fig . 1 ) .
Select a
range from
Table
1
which is
centered
about the
average
line
volt age .
Slide the bar to
the
desired
position
and plug it in . Push
the cover on
and tighten the
screws .
TABLE 1
Regulat ing
Ranges
Line
Voltage Select ion
Thi s inst rum ent operat es from eit her a 115 - volt or a
230 - volt nom inal line volt age source , 48 to 440 hertz . To
convert from one nom inal line volt age range to the ot her ,
m ove the Line Voltage Select or switch ( locat ed on side
panel ) to indicate the correct nom inal volt age . A 115 - to
230 volt adapter m ay be required for the line - cord plug . Be
sure to use the correct line fuse for the line volt age
select ed
(
see Table 1 ) .
Range
Select or
Switch Posit ion
Regulat ing
Range
115 - Volts 230 - Volts
Nom inal Nom inal
99 to 121
volt s
198 to 242
volt s
LO ( Switch bar
in
lower
holes )
M (
Switch bar
in
m iddle
holes
)
HI (
Switch
bar
in
upper
holes )
Fuse Size
104 to 126
volt s
207 to 253
volt s
Regulat ing
Range
Select ion
The Regulat ing Range Select or assem bly ( locat ed on
the rear panel ) is set for one of the line volt age ranges
shown in Table 1. It also contains the line fuse for overload
prot ection .
108 to 132 volt s
216 to 264
volt s
1.5 A 3AG
Fast - blow
0.75 A 3AG
Fast - blow
2
475 and
DM43
/
DM40 Operat ors
REV . B. SEPT
1974

OPTIONS
Options are available to alt er oscilloscope perform ance
to m eet part icular applications . A num ber in eit her MOD
slot ( see It em
53 ,
Controls ,
Connectors , and
Indicators )
indicates a
m odi fi ed
oscilloscope .
AGATE
300
TES
NA
SA
100
X 12
SELECTOR SWITCH BAR
( SHOWN
IN
MEDIUM
POSITION )
Toy
B GATE
5008 5.3
2304
* 33 /
SOWATCH
OR
STRAUMERIONTSOE RLARI
P808 POWER
CH VERT
SIGNAL OUT
SG 2010


EXT
2
AXIS 15 KG
POSITE GING
ABOVE
GHO
DECREASES
PROBE
POWER
LINE FUSE
1739-1
Fig . 1. Regulat ing range select or and line fuse .
REV . B , SEPT 1974
475
and DM43 /
DM40
Operat ors
3

2
4
CONTROLS , CONNECTORS
AND INDICATORS
5
RANGE
2020
2012
20202
203
FUNCTION
ZONO
vous OHMS
TITAE
TEMPECE
VERTICAL
om os
AZ
OSCILLOSCOPE
3
MOLTS /
CM3
1. CH 1 and CH 2 VOLTS / DIV
Select s the vert ical
deflection fact or in a 1-2-5 sequence ( VAR control m ust be
in the calibrat ed detent for the indicated deflection fact or ) .
7
6
VERY
9
MODE
**
8
2. VOLTS / DIV Readout - Consist s of two sm all lam ps
for each channel , locat ed beneat h the skirt of each
VOLTS / DIV knob . One or the ot her lam p will light up to
indicate the correct deflection fact or when a probe with a
scale -
switching connector is
used . A probe
without
this
connector lights the X1 lam p .
5
4
2
3
6
SOCUS
SCALE
RIN
LA
3. VAR  Provides continuously variable uncalibrated
deflection fact ors between the calibrat ed sett ings of the
VOLTS / DIV switch , and ext ends the m axi m um vert ical
deflection to at least 12.5 volt s per division ( 5 volt
position ) .
( 10
7
1
1739-4
4.
UNCAL
Lam p
Indicates when the VAR
VOLTS / DIV control is out of the calibrat ed detent and the
vert ical deflection fact or is uncalibrated .
Fig . 2. Vert ical controls , connectors , and indicators .
4
475
and DM43 /
DM40
Operat ors
REV . B , SEPT 1974

5.
POSITION -
Posit ions
the
display
vert ically
. In
the
X - Y m ode , the CH 1 POSITION control positions on the X
axis ( horizont ally ) and the CH 2 POSITION control
positions
on
the Y - axis (
vert ically
) .
ALT : Provides dual - trace display of the signals of bot h
channels . Display is switched between channels at the end
of each sweep . Useful at sweep rat es fast er than about 50
m icroseconds / division .
6. CH 1 OR
X and CH 2
OR Y  Input
connectors for
application of ext ernal signals to the inputs of the vert ical
am pli fi er . In the X - Y m ode of operat ion , the signal
connected to the CH 1 OR X connector provides horizon
tal deflection and the signal connected to the CH 2 OR Y
connector provides vert ical deflection .
ADD : Signals applied to the CH 1 and CH 2 input
connectors are algebraically added , and the algebraic
sum is
displayed on the crt
. The
INVERT switch in
Channel
2 allows the display
to be CH
1 plus CH 2 or CH
1 m inus CH
2. Useful for com m on - m ode rejection to rem ove an
undesired signal or for dc offset .
CHOP : Provides dual - trace display of the signals of
bot h channels . Display is switched between channels at a
repetition rat e of approxim at ely 250 kHz . Useful at sweep
rat es slower than about 50 m icroseconds / division , or
when a dual - trace , single - sweep display is required .
7. AC - GND -
DC  Select s
the
m ethod used to couple
a signal to the input of the vert ical am pli fi er . In the AC
position , signals are capacit ively coupled to the vert ical
am pli fi er . The de com ponent of the input signal is blocked .
In the GND position , the input of the vert ical am pli fi er is
disconnect ed from
the input
connector
and
grounded to
allow the input coupling capacit or to precharge . In the DC
position , all com ponent s of the input signal are passed to
the input am pli fi er .
CH 2 : Channel 2 only is displayed . It m ust be select ed
in X
- Y
operat ion .
9. 100
OR 20
MHz
BW /
TRIG
VIEW

Three
-
purpose
switch that li m it s the bandwidt h of the vert ical am pli fi er
syst em to approxim at ely 100 MHz ( first detent ) or 20 MHz
( second detent ) when pulled , or when pressed , causes the
signal applied to A Trigger Generat or to be displayed on
the
crt
.
8.
VERT
MODE
Select s
m ode
of
operat ion for
vert ical
am pli fi er syst em .
CH 1 :
Channel 1
only
is
displayed .
10. INVERT  Channel 2 display is invert ed in the
INVERT ( butt on in ) position .
REV . B , SEPT
1974
475 and
DM43
/
DM40
Operat ors
LO

18
19
21
22
20
23
24
RANGE
OV
220 V
30
FUNCTION
LINE
20M
VOLTS
OHMS
TIME
TEMPC
***
TRENIX
DM43
POSSON
1475
OSCILLOSCOPE
BELAV
TOITEON
VOLTS /
DIV
BOLBRIGGER
SOOS
LEVEL
VRE
WA
W
X2
DC
28
A
AND B
TIME /
DIV
DELAY
TIME
( 11
N
VERT
MODE
ON
SARE
oa
ORO
HORUS
OSPLAY
VOLTS /
DIV
ES
BER
OX
ADS
COMPUNG
SC
A
TRIDGE
NEX
Aut o
AC
STEN NAM
DC
ERT
30
are
8.8
TO
MOLQOFF
WAN
MINE
CALIBRATOR
INTENSON
FOCUS
SRL
ALUM
MES
3888
POSITION
30
8185177
12
13 14
15 16
17
1739-5
Fig . 3. Display and DM 43 / DM40 controls , connectors and indicators .
6
475 and
DM43
/
DM40 Operat ors
REV . B , SEPT 1974

19.
Probe
Connector
Deleted on
DM40 .
Input
connector for the
t em perat ure
probe
only .
DISPLAY
11.
Internal
Grat icule -
Elim inat es
parallax .
Riset im e ,
am pli tude
and
m easurem ent poi nt s are
indicated
at the
left -
hand
graticule
edge .
12. BEAM FINDER
Com presses the display to
within the graticule area independent ly of display position
or applied signals and provides a visible viewing level .
20. Readout Negat ive
polarit y
indication is
aut om at ic for negat ive dc volt age and t em perat ure with no
polarit y indication for positive m easurem ent . A blinking
display indicates overrange . The decim al poi nt is position
ed by the FUNCTION and RANGE controls for m ult im eter
operat ion and the oscilloscope A TIME / DIV switch in the
TIME m ode .
13.
INTENSITY
display
Controls bright ness of the crt
14. FOCUS - Adjust s for opt im um display definition .
21.
RANGE 
Select s
from
.2 V to
1.2 kV dc
in 5
ranges
( 1200 volt s is the m axi m um safe input in the 1.2 kV dc
m ode
) ;
from 200
ohm s to 20
m egohm s in 6
ranges .
6
15.
SCALE
ILLUM

Controls
graticule
illum inat ion .
.
16. ASTIG  Used in conjunct ion with the FOCUS
control to
obt ain a well -
defined
display
. It
does
not
require
readj ust m ent in
norm al use .
22. FUNCTION
Select s
VOLTS
,
OHMS , TIME or
TEMP (  C ) , except the DM40 lacks the TEMP (  C )
funct ion .
17.
TRACE
ROTATION
the horizont al graticule lines .
Adjust s trace to
align with
23. TIME m s and us Lam ps  Indicates m easurem ent
t im e . There
is a
m illi second lam p and a
m icrosecond lam p ;
no lam p lit indicates seconds .
DM43 / DM40
18. Input
Connectors

Two banana jacks
provide +
( red ) and COM ( black ) inputs for volt age and resist ance
only .
24. TIME
ZERO  Reset s
the TIME
readout
to zero at
any reference poi nt on the oscilloscope ’ A ’ sweep in the
TIME
m ode .
REV . B. SEPT 1974
475 and
DM43
/
DM40
Operat ors
7

TRIGGER
TIME
m s
TERRONE
ZERO
OM
43
25. TRIG
MODE
Determ i nes the m ode of trigger
operat ion for A Sweep .
DATOS
OORUM
SIE
SIN
ON
LEVEL
RE
*
83
A.
TIME
/
DIV
DELAY
TIME
26
AUTO : Sweep is initiated by the applied trigger signal .
In the absence of an adequat e trigger signal , or if the
trigger
repetition
rat e
is
less than
about
20
hertz , the
sweep
free runs
and
provides
a
bright
reference trace
.
27
DISHLAR
88
SOURCE
ATRICEER
AUTO
LEV
ACAN
25
NORM : Sweep is initiated by the applied trigger signal .
In the
absence of an
adequat e
trigger signal ,
there is no
trace
.
When the
trigger rat e
is too
low for
AUTO use
NORM .
NON
2
OYO
SA
WONOLDOF
CALSBRATOR
M
MAS
PU
POSITION
3185177
SINGL SWP : When this pushbutton is pushed , the A
Sweep
operat es in
the
single sweep
m ode .
Aft er a single
sweep
is displayed
,
furt her
sweeps
cannot be
presented
unt il
the
SINGL
SWP butt on is
again
pushed . It
is useful
when
the
signal to
be displayed
is not
repetitive
or varies in
am pli tude ,
shape or t im e
causing an
unst able
conven
tional display . It can also be used to phot ograph a
nonrepetit ive signal .
29
28
1739-6
Fig . 4.
Trigger
controls ,
connectors ,
and
indicators .
8
475 and
DM43
/
DM40
Operat ors
REV . B ,
SEPT
1974

26.
READY
Lam p
Indicates A Sweep is " arm ed "
and , upon receipt of an adequat e trigger signal , will
present a single - sweep display .
AC : Signals are capacit ively coupled to the input of the
trigger generat or . Dc is rejected and signals below about
60 Hz are at tenuat ed .
27. TRIG Lam p  Indicates that A Sweep is triggered
and will produce a stable display . It is useful for sett ing up
the trigger circuit s when a trigger signal is available
without a display on the crt ( for exam ple , when using
ext ernal
triggers
) .
LF REJ : Signals are capacit ively coupled to the input
of the trigger circuit . Dc is rejected and signals below
about 50
kHz are
at tenuat ed . It is
useful for
providing
a
stable display
of the high -
frequency com ponent s of a
com plex
waveform .
28. A TRIG
HOLDOFF

Provides continuous control
of t im e
between sweeps
.
Allows
triggering
on
aperiodic
signals ( such as com plex digit al words ) . In the fully
clockwise position ( B ENDS A ) , A sweep is reset at the end
of B sweep to provide the fast est possible sweep repetition
rat e for delayed - sweep presentations and low - repetition
rat e signals . Use the A trigger controls for the best
possible display before using the A TRIG HOLDOFF
control .
HF REJ :
Signals
are
capacit ively
coupled to the
input
of the trigger circuit . Dc is rejected and signals below
about 60 Hz
and above about
50 kHz are
at tenuat ed
. It is
useful
for
providing a
stable
display
of
the low -
frequency
com ponent s
of a
com plex
waveform
.
DC : All com ponent s of a trigger signal are coupled to the
input of the trigger circuit . It is useful for providing a stable
display of low - frequency or low - repetition rat e signals ,
except the com binat ion of the ALT ( dual trace ) m ode with
the trigger SOURCE switch in NORM .
29.
COUPLING 
Determ i nes m ethod used to
couple
signals to the trigger generat or circuit .
REV
. B ,
SEPT
1974
475 and
DM43
/
DM40 Operat ors
9

30.
SLOPE
Select s the slope of the trigger signal
that
start s
the
sweep .
32
31
TIME
ZERO
dM43
30
DELAY
TIME
PONER
ti Sweep can be triggered from the positive - going
port ion of a trigger signal .
DLY
Reis
8168 LEYE
REU
NEREDE
CH
3
A B
TIME
/
DIV
*
BELAY
TIME
33
- Sweep can be triggered from the negat ive - going
port ion of a trigger signal .
HORIZ
DISPLAY
2
*
Correct SLOPE sett ing is im port ant in obt aining a
display when only a port ion of a cycle is being displayed .
SO
*
TAGSE
31
MUY
ATS
20
LEVE
REN
ON
DR2
LINE
30
BS
EX
A
TRIO
HOLDOF
AN
CALIBRATOR
NE
28
POSITION
36
B85177
33
31.
LEVEL
Select s the
am pli tude
poi nt
on the
trigger
signal
at which the
sweep is
triggered . It is
usually
adjust ed for
the
desired
display
aft er
trigger SOURCE ,
COUPLING
and
SLOPE have been
select ed .
32
1739-7
Fig . 5. Trigger controls , connectors , and indicators .
10
475 and
DM43 /
DM40
Operat ors
REV . B. SEPT
1974

32. SOURCE
Determ i nes the
source of the
trigger
signal coupled to the input of the trigger circuit .
the line frequency or when it is desirable to provide a
stable display of a line - frequency com ponent in a com plex
waveform
.
NORM : Trigger source is displayed signal ( s ) . It does
not indicate t im e relat ionship betwen CH 1 and CH 2
signals . However , stable triggering of nont im e relat ed
signals usually can be
obt ained by sett ing
VERT MODE
to
ALT , SOURCE to NORM and COUPLING to LF REJ .
Carefully
adjust
LEVEL for a
stable
display .
EXT : Signals connected to the External Trigger Input
connectors are used for triggering . External signals m ust
be t im e - relat ed to the displayed signal for a stable display .
It is useful when the internal signal is too sm all or contains
undesired signals that could cause unst able triggering . It
is useful when operat ing in CHOP Mode .
CH 1 : A
sam ple of the signal
available in Channel
1 is
used as a trigger signal . CH 2 signal is unst able if it is not
t im e relat ed .
EXT = 10 ( A Trigger circuit only ) : External trigger
signal is
at tenuat ed
by a
fact or of 10 .
CH 2 : A sam ple of the signal av
in Channel 2 is
used as a trigger signal . CH 1 signal is unst able if it is not
t im e relat ed
STARTS
AFTER DELAY ( B
Trigger circuit only )
: B
Sweep runs im m ediat ely aft er the delay t im e select ed by
the DELAY - TIME POSITION control .
LINE ( A Trigger circuit only ) : A sam ple of the power
line frequency
is used as
a trigger signal
. It is useful
when
the input signal is t im e - relat ed ( m ult iple or subm ult iple ) to
33.
External
Trigger
Input s
ext ernal
trigger
signals
.
Input
connectors
for
REV . B. SEPT 1974 475
and DM43 /
DM40
Operat ors
11

AND
HORIZONTAL ,
CALIBRATOR
,
POWER
( 41XB
(
20
38
TIME
TEXTHON
DM
43
34. FINE / POSITION  Posit ions the display horizon
tally for A Sweep and B Sweep .
ZERO
A3
TERE DE
BELAY 3
US
41
SELAT
CE
BLOGGER
A
VE
ETA
BA
SOM
37
 
35. X10 MAG
Increases
displayed
sweep
rat e
by a
fact or of 10. It ext ends fast est sweep rat e to 1 nano
second / division . The m agnified sweep is the center
division of the unm agni fied display ( 0.5 division eit her side
of the
center graticule line ) .
40
**
3
288
A XUS
TIME
/
OIV
DELAY
TIME
39
44
38
36. HORIZ DISPLAY
Determ i nes the m ode of
operat ion for the horizont al deflection syst em .
AZ
DISNEY
ONE
***
COUPLING
ATRICE
36
43
AUTO SEV
WORM
w ..
A : Horizontal deflection provided by A Sweep at a
sweep
rat e
det erm i ned
by the
sett ing of the
A TIME / DIV
switch . B sweep is inoperat ive .
EN
02
UNE
EXT
*
NEN
See
SUP
ATLIG
MOLDOFF
NIC
CALIBRATOR
23
POSITION
393
AWAL
8185117
MIX : The first
part of the
horizont al
sweep is
displayed
at a rat e set by the A TIME / DIV switch and the lat ter part of
the sweep at a rat e set by the B TIME / DIV switch . Relative
am ount s
of
the
display
allocat ed
to
each of the two
sweep
rat es are det erm i ned by the sett ing of the DELAY - TIME
POSITION control .
35
34
42
1739-8
A INTEN : The sweep rat e is det erm i ned by the A
TIME
/
DIV
switch . An
intensified
port ion
appears on the
display during the B Sweep t im e , which is about 10 t im es
Fig . 6.
Horizontal ,
calibrat or ,
and
power
.
12
475 and
DM43 /
DM40
Operat ors
REV . B , SEPT 1974

the B
TIME /
DIV
switch
sett ing .
This switch
position
provides
a
check of
the
durat ion and
position of the B
Sweep (
delayed
sweep )
with
respect to the
A
Sweep
(
delaying
sweep
) .
It
ext ends
the
slowest A
Sweep rat e to
at least 1.25
seconds / division . The A Sweep rat e is calibrat ed when the
control is set fully clockwise to the calibrat ed detent .
B DLYD : The sweep rat e is det erm i ned by the B
TIME / DIV
switch
with
the delay
t im e
det erm i ned by
the
sett ing of the DELAY TIME ( A TIME / DIV ) switch and the
DELAY
- TIME
POSITION
control
.
39.
UNCAL
Lam p
Indicates
the
A
Sweep
rat e
is
uncalibrated ( VAR
control
out
of the
calibrat ed detent ) .
40. X10 MAG
Lam p 
Indicates
that the
X10
m agnifier
is
on .
41a . DELAY TIME POSITION
Provides variable
sweep delay to m ore than 10 t im es the delay t im e indicated
by the A TIME / DIV switch .
37a . A AND B
TIME / DIV
AND DELAY
TIME  A
TIME
/
DIV
switch
(
clear
plastic
skirt
)
select s the
sweep
rat e of the A
Sweep
circuit for A sweep
only
operat ion and
select s the basic delay t im e ( to be used by the DELAY
TIME
POSITION
control ) for
delayed
sweep operat ion . B
TIME / DIV
switch ( pull out
and rotat e to
unlock ) select s the
sweep rat e for the B Sweep circuit for delayed sweep
operat ion only . A VAR control m ust be in the calibrat ed
detent
for
calibrat ed
A
Sweep
rat es .
When bot h
TIME / DIV
switches
are
fully
count erclockwise to the X -
Y position ,
the
horizont al ( X - axis )
display
is
the CH 1
input .
41b .
DM43
/
DM40
DELAY
TIME
POSITION
The
control
operat es
in the
sam e
m anner
as
41a . above .
When
the DM43 or
DM40 is in
the TIME m ode
, the
DELAY - TIME
POSITION
control , in
conjunct ion with the
ZERO
reset
butt on
,
m easures t im e
between any t wo
poi nt s
on
the
oscilloscope
display
.
37b . DM43 / DM40 A AND B TIME / DIV AND DELAY
TIME 
The
controls
operat e in the sam e
m anner
as
37a .
above . The
A TIME / DIV
switch also
controls
the
TIME
lam ps and decim al poi nt locat ion when the DM43 / DM40 is
in the TIME m ode .
42. CALIBRATOR
A
com binat ion current
loop / square - wave volt age output that perm i ts the
operat or to com pensat e volt age probes and check vert ical
gain , current probes and oscilloscope operat ion . It is not
intended
to
verify t im e - base
calibrat ion
.
43. POWER
Turns
inst rum ent power on
and off .
38.
VAR 
Provides
continuously variable
sweep
rat es
between the
calibrat ed
sett ings of the A
TIME /
DIV
switch
.
44. LOW
LINE Lam p 
Indicates
that the
applied
line
volt age is
below the
lower li m it of the
regulating
range
select ed
by
the
Regulat ing
Range
Select or
.
REV . B , SEPT
1974
475
and
DM43 /
DM40
Operat ors
13

REAR
PANEL
53
45
45. A + GATE  Provides a positive - going rectangular
pulse
coincident with
the A
Sweep t im e ,
which
can
be
used
to
trigger the
signal
source
( with
TRIG
MODE switch
set to
AUTO ) .
MOO
SEXSONS
BEAVERION ORLD 834
AGATE
8000
6.SVN
46
U
WATTS ( MAX ) 100
AMPS MAX ) 1.2
AT USV 60HZ
15A
FAST
315V
FUSE
20A FAST 230V
GATE
500 6.5V
51
46. B + GATE  Provides a positive - going rectangular
pulse
coincident with
the B
Sweep t im e , which
can be
used to
trigger
the
signal
source
aft er a
select ed
delay
t im e ,
providing that
A
Sweep is
triggered
internally .
1952907 SWITCH INSIDE
SWESTRUMENT RIGHT SIDE , REAA ,
PROBE POWER
47
CH2 VERT
SIGNAL
OUT
500 20m V / DIV
52
47. CH 2 VERT
SIGNAL
OUT 
Provides a
sam ple of
the
signal applied
to the
CH 2
input
connector .
48
 
03-02
238.254
M
306 125
288 -252
LO
38-123
188-242
50-440M2
LINE
FUSE
INSIDE
EZ
AXIS 15
POSITIVE GOING INPUT
ABOVE GROUND
DECREASES INTENSITY
PROBE
POWER
48. EXT Z - AXIS

Perm it s intensity
m odulat ion of the
crt display
.
Does not
affect display
waveshape
. Signals
with fast rise and fall provide the m ost abrupt intensity
change
.
Signals
m ust be
t im e -
relat ed
to the
display
for a
stable
display
. Useful
for
adding
t im e
m arkers
in un
calibrat ed m odes of
operat ion
.
50
49
1739-9
-
49. Line
Fuse Holder
Contains the
line fuse and
the
regulating range
select or . See Table
1 for change
inform a
tion .
Fig . 7. Rear panel controls , connectors , and indicators .
14
475 and
DM43
/
DM40
Operat ors
REV
. B.
SEPT
1974