Sencore PS163 User manual
PS163
DUAL
TRACE
TRIGGERED
SWEEP
OSCILLOSCOPE
gs
T
e
5
WIA,
INSTRUCTION
MANUAL
ETD
I
CC
ORNE
"the
all
american
line”
Ye
214
.
LN
SENCORE
SAFETY
REMINDERS
When
testing
electronic
equipment,
there
is
always
a
danger
present.
Unexpected
high
voltages
can
be
present
at
unusual
locations
in
defective
equipment.
The
technician
should
become
familiar
with
the
device
he
is
working
on
and
observe
the
following
precautions.
1.
An
isolation
transformer
should
always
be
used
on
equipment
having
the
chassis
tied
to
one
side
of
the
AC
power
line.
The
case
of
the
PS163
is
connected
to
the
earth
ground
side
of
the
AC
line
through
the
third
wire
of
the
line
cord.
If
the
chassis
of
the
equipment
being
serviced
is
connected
to
the
other
side
of
the
AC
line,
a
severe
shock
hazard
will
be
present.
In
addition,
as
soon
as
the
PS163
ground
lead
is
connected
to
the
chassis
the
resultant
short
circuit
will
fuse
the
ground
clip
of
the
scope
to
the
chassis
of
the
equip-
ment
being
serviced,
and
blow
the
fuse
to
your
service
bench.
2.
When
making
test
lead
connections
to
high
voltage
points,
remove
the
power.
If
this
can-
not
be
done,
be
sure
to
avoid
contact
with
other
equipment
or
metal
objects.
Place
one
hand
in
your
pocket
as
a
safety
precaution
and
stand
on
an
insulated
floor
to
reduce
the
possibility
of
shock.
3.
Discharge
filter
capacitors
before
connecting
test
leads
to
them.
Capacitors
can
store
a
charge
that
could
be
dangerous
to
the
technician.
4.
Be
sure
your
equipment
is
in
good
order.
Broken
or
frayed
test
leads
can
be
extremely
dangerous
and
can
expose
the
technician
to
dangerous
potentials.
5.
Remove
the
test
leads
immediately
after
the
test
has
been
completed
to
reduce
the
possibility
of
shock.
6.
Do
not
work
alone
when
working
on
hazardous
circuits.
Always
have
another
person
close
by
in
case
of
accident.
Remember,
even
a
minor
shock
can
be
the
cause
of
a
more
serious
accident,
such
as
falling
against
the
equipment,
or
coming
in
contact
with
higher
voltages.
TABLE
of
CONTENTS
SENCORE
SAFETY
REMINDERS
TABLE
OF
CONTENTS
DESCRIPTION
INTRODUCTION
FEATURES
SPECIFICATIONS
VERTICAL
(CHANNEL
A
AND
B)
HORIZONTAL
TRIGGERING
VECTOR
OR
X-Y
MODE
GENERAL
OFF-ON
SWITCH
SCALE
ILLUMINATION
INTENSITY
CONTROL
FOCUS
HORIZONTAL
SYNC
SYNC
POLARITY
SYNC
LEVEL
LINE
SWEEP PHASE
HORIZONTAL
POSITION
5X
EXPAND
HORIZONTAL
SWEEP
Manual
Triggered
Auto
Triggered
Free
Running
TIME
BASE
FREQUENCY
DUAL
CHANNEL
-
VERTICAL
INPUT
Dual
Alternate
Dual
Chopped
Vector
A
&
B
Inputs
CHANNEL
A
AND
B
INPUT
CONTROLS
PPV
Per
Div.
Input
Coupling
Switch
DC
Balance
Cal
Volts
2V
PP
Trace
Position
REAR
PANEL
INPUTS
AND
CONTROLS
Sweep
Out
“Z”
Axis
Input
Vert
Def
Plates
Astigmatism
Control
Circuit
Breaker
Page
7
Page
8
Page
8
Page
9
Page
9
Page
10
OPERATING
INSTRUCTIONS
Page
11
INITIAL
FAMILIARIZATION
CONTROL
FUNCTIONS
Dual
Channel
Vertical
Input
Horizontal
Sweep
and
Sync
5X
Magnifier
Input
Coupling
T.V.Vertical
and
T.V.
Horizontal
60
Cycle
Sweep
Ext.
Horizontal
Sweep
PROBE
COMPENSATION
Page
13
APPLICATIONS
Page
14
AC
VOLTAGE
MEASUREMENT
DC
VOLTAGE
MEASUREMENT
Single
Trace
Method
Dual
Trace
Method
MEASURING
THE
DC
LEVEL
OF
AN
AC
SIGNAL
Page
15
COMPARISON
OF
VOLTAGES
COMPARISON
OF
AC
SIGNALS
LOCALIZATION
OF
INTERMITTENTS
GAIN
AND
DISTORTION
MEASUREMENTS
Page
16
Gain
Measurements
Distortion
Measurements
TIME
AND
FREQUENCY
MEASUREMENTS
Page
16
Time
Measurements
Using
the
Calibrated
Time
Base
Frequency
Measurements
Using
Calibrated
Time
Base
Frequency
Measurements
Using
Lissajous
Figures
Frequency
Measurements
Using
the
Modulated
Ring
PHASE
SHIFT
AND
TIME
DELAY
MEASUREMENTS
Page
18
Time
Delay
Between
Signals
Phase
Shift
Between
Signals
VECTOR
SERVICING
Page
19
The
Ideal
Vector
Pattern
Setting
the
Tint
Range
with
the
Vector
Pattern
Adjusting
the
3.58MHz
Oscillator
Aligning
the
Band
Pass
Amplifier
Troubleshooting
with
the
Vector
Pattern
SQUARE
WAVE
TESTING
WITH
THE
PS163
Page
21
RISE
TIME
MEASUREMENTS
Page
22
COIL
AND
TRANSFORMER
TEST
Page
23
USING
THE
PS163
WITH
THE
SWEEP
GENERATOR
Page
23
WAVEFORM
PHOTOGRAPH
Page
24
DETECTOR
PROBE
Page
24
SERVICE
AND
WARRANTY
Page
24
SCALE
ILLUMINATION
7
VRT
OFF
GRO
0
ON
INTENSITY
HORIZONTAL
SYNC
INTA
INTG
LINE
EXT
SYNC
POLARITY
POSITIVE
NEGATIVE
E
|
HORIZONTAL
SYNC
LEVEL
2
|
POSITION
LINE
SWEEP
PHASE
PS
163
e
`
©
لني
ENCORE
OSCILLOSCOPE
_DUAL
CHANNEL-
VERTICAL
INPUT
HORIZONTAL
SWEEP
ae
are
9
3
MANUAL
AUTO
FRE
r
E
Tyr,
+
|
AOA
TRIGGERED
Ra
CHANNEL
A
|
CHANNEL
B
TIME
BASE
e
FREQUENCY
|
E
100H:
33
so
Nowtts
K
e
\
O
PPY
rer
on
©
PPY
perom.
500
@
TURN
FULL
CLOCKWISE
atiet
L
a
aT
S
O
TIME
per
كانه
70
READ
PPY
UREN
READ
SCALE
DIRECT
WHEN
FR
E0.
rome
CARER
"E
ne
simn
<
yU
CLOCKWISE
10
READ
SWEEP
SPEED
:
EXTERNAL
EXTERNAL
HORIZONTAL
ROUNO
TRIGGER
COUPLED
cL
vu
ca
we
4
١
œ
®
l
am
PS163
Dual
Channel
-
Dual
Trace
Triggered
Sweep
Oscilloscope
DESCRIPTION
DINTRODUCTION
The
rapid
changes
which
are
taking
place
in
electronics
today
are
causing
engineers,
designers,
technicians
and
instructors
to
take
a
critical
look
at
the
equipment
they
will
need
to
keep
pace
with
these
changes.
The
dramatic
increase
of
solid
state
components
being
used
has
created
different
test
equipment
require-
ments
than
the
tube
circuits
of
the
past.
The
in-
creasing
use
of
Field
Effect
Transistors
and
Integrated
Circuits
are
other
important
facts
to
consider.
-
What
do
all
these
changes
mean
to
the
area
of
oscillo-
scopes?
First,
the
lower
potentials
used
in
these
cir-
cuits
and
the
much
lower
signal
levels
call
for
an
in-
strument
with
increased
sensitivity
if
it
is
to
be
pract-
ical
for
the
design
and
servicing
of
solid
state
circuits.
More
emphasis
is
being
placed
on
critical
waveform
analysis
and
the
comparison
of
waveforms,
part-
icularly
the
timing
of
“concurrent?”
waveforms
present
in
much
of
the
equipment
used
today.
This
includes
the
fields
of
television,
computors,
and
particularly
the
educational
field.
The
instrument
to
fill
these
ap-
plications
requires
triggered
operation
for
the
mean-
ingful
measurement
of
pulse
time
and
concurrent
waveform
comparison.
It
must
have
full
dual
trace
apability
if
any
comparisons
are
to
be
made.
In
add-
tion,
it
must
be
simple
to
operate
and
provide
full
versatility.
The
25163
fulfills
these
requirements
and
more.
Ease
of
operation
has
been
one
of
the
important
design
considerations
of
the
PS163.
The
Free
Running
sweep
feature
has
been
added
to
simplify
operation
for
those
not
familiar
with
triggered
sweep
scopes.
The
PS163
incorporates
the
latest
in
solid
state
design
to
assure
long
and
trouble
free
service.
A
glance
at
other
features
of
this
practical
instrument
will
point
out
its
many
uses
and
advantages.
FEATURES
***
EXTREMELY
STABLE
triggered
sweep
with
full
bandwidth
capability
in
both
automatic
and
man-
ual
triggered
modes,
PLUS
free
running
capability
for
use
as
a
sync-sweep
service
oscilloscope.
***
COMPLETE
DUAL
TRACE
capability
with
pushbutton
selection
of
CHANNEL
A,
CHANNEL
B,
DUAL
ALTERNATE
or
DUAL
CHOPPED
dis-
lays,
PLUS
Sencore’s
exclusive
VECTOR
mode
for
preci
display
of
phase
relationships.
***
VERTICAL
INPUT
SENSITIVITY
of
5mV/cm
direct.
50mV/cm
with
low
capacity
probe.
Input
attenuator
calibrated
to
read
directly
when
using
low
capacity
probe.
Gain
continuously
variable
between
attenuator
positions.
***
BANDWIDTH
of
DC
to
8MHz-3db,
useable
to
15MHz.
Negligible
overshoot,
typically
1%
or
less.
***
CALIBRATED
TIME
BASE
rates
from
.1
mic-
rosecond
to
.1
second
per
division
in
19
positions
plus
TVV,
TVH,
60Hz
and
EXT.
positions.
Sync
separator
automatically
added
in
TVV
and
TVH
sweep
positions
for
rock
solid
display
of
complex
TV
waveforms.
60Hz
and
EXT.
positions
provided
for
line
sweep
and
use
with
sweep
generators.
*k*
FRONT
PANEL
correlation
between
sweep
speed
and
frequency
for
ease
of
operation.
Sweep
speed
continuously
variable
between
steps.
5X
mag-
nification
provided.
***
PUSHBUTTON
SELECTION
of
trigger
sources:
Internal
Channel
A,
Internal
Channel
B,
Line
or
Ex-
ternal.
#**
HIGH
INPUT
IMPEDANCE
of
10
megohm
shunted
by
1م11
using
low
capacity
probe.
1
meg-
ohm
shunted
by
35pf
at
input
terminals.
***
FULLY
PROTECTED
Field
Effect
Transistor
input.
Maximum
input
voltage
with
the
Low
Capacity
Probe
is
5000
volts
peak
to
peak
AC,
or
1000
volts
DC.
This
allows
measurements
of
signals
that
can
destroy
other
oscilloscopes.
***
ILLUMINATED
full
size
10
x
10cm
grid
PLUS
illuminated
vector
grid
at
the
flip
of
a
switch.
No
separate
grids
to
change
or
become
misplaced.
***
RETRACTABLE
TIP
on
special
KV
low
cap-
acity
probe
for
ease
of
connection
in
hard
to
reach
places.
***
SOLID
STATE
for
dependable
accuracy
and
reliability.
2KV
regulated
CRT
supply
with
DC
blank-
ing
for
brightest,
sharpest
trace
possible.
SPECIFICATIONS
VERTICAL
(CHANNEL
A
and
B)
Sensitivity
.005V/cm
to
50V/cm
in
13
ranges.
FRONT
PANEL
calibrated
from
.05
V/cm
to
500V/cm
for
direct
read-
ing
with
low
capacity
probe.
Gain
continuously
variable
between
range
positions.
Bandwidth
DC
to
8MHz
-8db.
Useable
to
15MHz.
Overshoot
Negligible.
Typically
1%
or
less.
Accuracy
+
2%
Rise
Time
40
nanoseconds
Input
Voltage
5KV
peak
to
peak
AC
or
1KVDC
maximum
through
low
capacity
probe.
Input
Impedance
10
megohms
shunted
by
11pf
using
low
capacity
probe.
1
megohm
shunted
by
35pf
at
input
terminals.
HORIZONTAL
Time
Base
.1
microsecond/cm
to
.1
second/cm
Range
in
19
calibrated
ranges,
continuously
Triggered
variable
between
steps.
Additional
TVV
and
TVH
provide
correct
time
base
to
view
vertical
or
horizontal
frames
of
TV
waveforms.
Free
Run
.1Hz
to
1MHz
in
19
ranges,
con-
tinuously
variable
between
steps.
Accuracy
+
2%(Triggered
mode
only)
Sweep
5X,
5%
accuracy
(not
calibrated
Magnification
on
.1,
.2,
and
.5uSec/cm)
Horizontal
Input
Variable,
uncalibrated
Sensitivity
Direct:
Less
than
750mV
required
for
one
cm
of
deflection.
With
5X
expand:
Less
than
150mV
required
for
one
cm
of
deflection.
Input
Impedance
1
megohm
shunted
by
40pf.
TRIGGERING
Manual
Sync
level
adjustable.
Base
line
reference
remains
in
absence
of
a
trigger
source.
Automatic
6
Free
Run
Source
Level
Require-
ments
Internal
External
Conventional
sync-sweep
operation.
€
Channel
A,
Channel
B,
Line
or
ex-
ternal.
Positive
or
negative
slope
polarity.
lcm
of
display
15mV
minimum.
Input
impedance:
1
megohm
shunted
by
40pf.
VECTOR
or
X-Y
MODE
Sensitivity
Frequency
Response
(-3db)
Display
Phase
Shift
GENERAL
Rear
Access
Calibrate
output
Chopped
Mode
Rate
CRT
CRT
Supply
Retrace
Suppression
Graticule
Power
Re-
quirements
Size
Weight
.005V/cm
to
50Vcm
direct.
.05V/
cm
to
500V/cm
using
low
capacity
probe.
DC
to
8MHz
vertical.
DC
to
7MHz
horizontal
Channel
A
vertical
Channel
B
horizontal
Negligible.
Typically
less
than
3°
at
5MHz.
Vertical
deflection
plates,
ground,
15V
peak
to
peak
horizontal
saw-
tooth
and
Z
axis
input.
1KHz,
2V
peak
to
peak
square
wave
through
front
panel
output
pin.
100KHz.
5UP1
Flat face
round
5
inch,
P-1
phosphor,
double
shielded.
2KV,
30KHz
regulated
RF
supply.
DC
coupled
unblanking
of
CRT.
2
layer
illuminated,
with
switch
selection
of
10
x
10cm
grid
or
30
vector
reference.
105
to
130
VAC,
60Hz
60
watts.
12
inches
high,
10
inches
wide
andi
15%
inches
deep.
30
lbs.
CONTROLS
OFF-ON
SWITCH
This
switch
controls
the
power
applied
to
the
unit.
The
ON
condition
is
shown
by
a
pilot
lamp
directly
above
the
switch.
SCALE
ILLUMINATION
Either
the
standard
10
x
10cm
grid
or
the
vector
grid
may
be
illuminated
for
trace
reference.
The
vector
grid
is
calibrated
with
30
reference
points
to
show
proper
placement
of
the
color
vector
“petal”’
pattern.
An
off
position
is
also
provided.
INTENSITY
CONTROL
This
control
adjusts
the
brilliance
of
the
trace.
Trace
brilliance
may
vary
somewhat
during
operation
of
the
PS163
when
using
the
5X
expand
at
higher
frequencies.
If
the
PS163
is
to
be
operated
under
a
stand-by
condition
for
any
length
of
time,
it
is
recommended
that
the
intensity
be
reduced
to
pre-
vent
burning
the
face
of
the
CRT.
SCALE
ILLUMINATION
VECT
OFF
GRID
OFF
ON
FOCUS
INTENSITY
FOCUS
This
control
adjusts
the
sharpness
of
the
trace.
Ad-
just
for
sharpest
trace
in
center
of
screen.
HORIZONTAL
SYNC
This
switch
allows
selection
INT.
A,
INT
B,
LINE,
or
EXT
sources
for
sync
information.
EXT
sync
signal
is
applied
to
the
EXTERNAL
TRIGGER
input.
SYNC
POLARITY
This
switch
selects
the
slope
of
the
sync
signal
used
to
trigger
the
time
base.
The
POSITIVE
position
will
cause
triggering
on
a
positive
going
signal;
the
NEG-
ATIVE
position
will
cause
triggering
on
a
negative
going
signal.
SYNC
LEVEL
This
control
functions
in
MANUAL
TRIGGERED
HORIZONTAL
SWEEP
mode
only.
It
is
used
to
ad-
just
the
level
of
sync
signal
necessary
to
produce
sweep
and
provide
a
stable
display.
LINE
SWEEP
PHASE
This
control
functions
in
the
60
cycle
position
of
the
TIME
BASE
-
FREQUENCY
switch
only.
It
is
used
to
adjust
the
phase
of
the
internal
60
Hertz
sine
wave
applied
to
the
horizontal
amplifier
for
line
sweep.
HORIZONTAL
POSITION
This
control
adjusts
the
horizontal
position
of
the
trace
in
all
functions
except
the
VECTOR
A+B
VERT-
ICAL
INPUT
MODE.
The
CHANNEL
B
TRACE
position
control
will
adjust
the
horizontal
trace
po-
sition
in
the
VECTOR
mode.
HORIZONTAL
SYNC
INT
A
INT.B
LINE
EXT.
U
U
D
T
SYNC
POLARITY
POSITIVE
ma
NEGATIVE
HORIZONTAL
SYNC
LEVEL
POSITION
LINE
SWEEP
PHASE
O
0
5X
EXPAND
The
5X
EXPAND
is
activated
by
a
push-pull
switch
coupled
to
the
HORIZONTAL
POSITION
control.
When
this
switch
is
in
the
out
position,
the
center
two
centimeters
of
the
horizontal
trace
are
expanded
to
a
full
10cm
wide
display.
5X
EXPAND
7
HORIZONTAL
SWEEP
This
pushbutton
switch
provides
selection
of
four
different
modes
of
time
base
operation.
MANUAL
TRIGGERED
This
mode
provides
manual
control
of
the
SYNC
LEVEL,
and
is
the
best
to
use
when
attempting
to
view
very
low
level
signals.
The
CRT
of
the
PS163
will
be
blanked
in
the
MANUAL
TRIGGERED
mode
until
the
time
base
receives
a
properly
adjusted
trigger
pulse.
(Refer
to
section
on
HORIZONTAL
SYNC,
SYNC
POLARITY,
and
SYNC
LEVEL
for
proper
ad-
justment
of
these
controls).
AUTO
TRIGGERED
In
this
mode,
the
time
base
will
provide
a
free
run-
ing
sweep
in
the
absence
of
a
trigger
signal.
The
time
base
will
automatically
switch
to
true
calibrated
triggered
sweep
operation
as
soon
as
a
trigger
signal
is
applied.
The
SYNC
LEVEL
is
preset,
and
the
con-
trol
is
inoperative
in
this
mode.
FREE
RUNNING
The
time
base
provides
a
free
running
sweep
in
this
mode,
with
sync
automatically
provided
from
the
source
selected
by
the
HORIZONTALSYNC
SWITCH.
The
TIME
BASE
-
FREQUENCY
switch
serves
as
a
course
frequency
adjustment,
with
range
of
frequencies
indicated
by
the
outer
ring
around
the
switch.
The
fine
frequency
adjustment
is
the
small
center
knob
of
the
TIME
BASE
-
FREQUENCY
switch,
and
is
ad-
justed
for
a
locked
in
pattern.
There
is
also
a
fourth
mode
of
operation
not
specifi-
cally
called
out
on
the
front
panel.
The
horizontal
sweep
will
function
in
the
automatic
mode,
with
man-
ual
adjustment
of
the
SYNC
LEVEL
control
if
all
three
HORIZONTAL
SWEEP
push
buttons
are
in
the
out
position.
TIME
BASE-FREQUENCY
This
control
consists
of
two
separate
sections.
The
first
is
an
outer
switch
showing
sweep
rate
per
div-
ision.
This
switch
also
shows
the
approximate
sweep
rate
in
cycles
per
second
to
aid
the
technician
in
-
determining
the
correlation
between
time
base
rates
and
frequency.
Two
additional
positions
(TV
Hor-
HORIZONTAL
SWEEP
MANUAL
AUTO
FREE
TRIGGERED
JTRIGGERED
|
RUNNING
TIME
BASE
—_,,4,—
FREQUENCY
ie
10KHz
2
WH
`
y
EXT.
.¢
nl
seo
RE
RUNNY
O
TIME
per
niv.
—
FREQ,
@
TURN
FULL
CLOCKWISE
TO
READ
SWEEP
SPEED
EXTERNAL
EXTERNAL
HORIZONTAL
GROUND
TRIGGER
©
Og
izontal
and
TV
Vertical)
provide
preset
sweep
fre-
quencies
for
convenient
display
of
television
signals.
A
sync
separator
circuit
is
automatically
switched
in
when
the
TV
Vertical
or
TV
Horizontal
positions
are
selected.
The
60
Hertz
position
of
this
switch
con-
nects
the
60Hz
line
signal
to
the
horizontal
deflec-
tion
amplifier.
The
phase
can
be
adjusted
by
the
LINE
SWEEP
PHASE
control.
The
EXT.
position
allows
an
external
signal
to
pro-
vide
horizontal
sweep.
This
signal
should
be
con-
nected
to
the
EXTERNAL
HORIZONTAL
jack.
The
second
section
is
the
small
knob
in
the
center
of
the
outer
switch.
This
control
operates
as
an
uncal-
ibrated
fine
frequency
control
in
all
normal
sweep
positions,
and
as
a
horizontal
gain
control
in
the
60Hz
and
EXT.
sweep
positions.
For
normal
operation
of
the
calibrated
sweep
speeds,
this
control
should
be
turned
to
the
clockwise
end
of
its
rotation
until
it
snaps
into
the
detent
provided.
€
DUAL
CHANNEL-VERTICAL
INPUT
DUAL
CHANNEL—VERTICAL
INPUT
DUAL
VECTOR
CHOPPED
A&B
INPUTS
DUAL
ALTERNATE
This
push
button
switch
gives
instant
selection
of
five
different
“displays”
or
modes
of
operation.
The
CHANNEL
A
and
CHANNEL
B
modes
provide
single
trace
display
of
the
selected
channel.
DUAL ALTERNATE
This
switch
provides
dual
trace
display
of
the
CHAN-
NEL
A
and
CHANNEL
B
signals.
The
signal
from
one
input
channel,
CHANNEL
A
for
example,
is
dis-
played
on
the
first
sweep
cycle.
On
the
next
sweep
cycle
the
other
channel
is
displayed.
This
is
the
re-
commended
mode
to
use
for
most
dual
trace
op-
erations.
DUAL
CHOPPED
This dual
trace
mode
is
most
useful
at
slow
sweep
speeds
and
when
it
is
desired
to
have
dual
trace
dis-
play
when
using
the
60
cycle
or
EXT.
sweep
pro-
visions.
The
DUAL
CHOPPED
mode
uses
a
100KHz
square
wave
to
switch
the
input
between
CHANNEL
A
and
CHANNEL
B.
This
will
provide
a
continuous
steady
display
of
both
channels
at
slow
sweep
speeds.
The
DUAL
CHOPPED
mode
is
intended
to
be
used
only
with
the
MANUAL
TRIGGERED
and
FREE
RUNNING
sweep
modes.
The
AUTO
TRIGGERED
function,
because
of
its
extreme
sensitivity,
will
tend
to
trigger
on
the
100KHz
chopping
signal.
VECTOR
A&B
INPUTS
This
display
mode
converts
the
PS163
to
a
full
sensi-
tivity
Vector
scope
or
X-Y
scope.
The
input
to
CHANNEL
A
will
be
displayed
vertically;
the
input
to
CHANNEL
B
will
be
displayed
horizontally.
CHANNEL
A
and
B
INPUT
CONTROLS
The
CHANNEL
A
and
CHANNEL
B
amplifiers
are
electrically
identical
and
a
description
of
one
will
apply
to
the
other.
PPV
PER
DIV.
This
switch
adjusts
the
input
sensitivity
of
the
amp-
lifiers,
and
is
calibrated
in
volts
per
division.
The
center
knob
of
this
switch
is
a
vernier
control
that
adjusts
the
sensitivity
of
the
amplifier
between
switch
positions.
For
normal
operation
with
calibrated
in-
put
this
control
should
be
turned
fully
clockwise
until
it
snaps
into
the
detent
provided.
The
input
amplifiers
are
calibrated
to
read
input
volt-
age
directly
when
using
the
Sencore
39G34
LO
CAP
PROBE.
No
multiplication
of
readings
is
required
when
using
the
LO
CAP
PROBE.
The
maximum
in-
put
voltage
with
the
LO
CAP
PROBE
is
5000
volts
peak
to
peak
AC
or
1000
volts
DC.
When
a
direct
probe
is
used,
all
readings
of
the
input
voltage
are
multiplied
by
.1.
The
maximum
input
voltage
direct
is
600
volts
DC
plus
peak
AC.
‘CHANNEL
A
O
PPY
per
ow.
500
05
|
©
TURN
FULL
CLOCKWISE
oc
TO
READ
PPY
BALANCE
READ
SCALE
DIRECT
WHEN
USING
LO
CAP
PROBE
COUPLED
COUPLED
©)
INPUT
A
R-Y
VECTOR
INPUT
TRACE
POSITION
CAL.
VOLTS
2۷
PP
9
INPUT
COUPLING
SWITCH
This
switch
is
used
to
select
the
method
of
coupling
the
input
signal
to
the
amplifier.
Use
the
AC
COUP-
LED
position
for
normal
peak
to
peak
waveform
measurements.
Use
the
DC
COUPLED
position
when
you
wish
to
measure
DC
voltage.
Use
the
center
ground
position
to
establish
a
zero
reference
for
the
amplifier.
DC
BALANCE
This
control
is
used
to
maintain
the
DC
balance
of
the
amplifier.
Its
function
is
similar
to
the
zero
ad-
just
control
on
a
VTVM.
Should
this
control
require
adjustment,
follow
the
procedure
outlined
in
the
CALIBRATION
section
of
the
Service
Manual.
CAL.
VOLTS
2V
PP
A
2
volt
peak
to
peak
square
wave
output
is
provided
on
the
front
panel
of
the
25163
as
a
calibration
check
voltage
and
probe
adjustment
signal.
The
LO
CAP
PROBES
may
require
a
periodic
checking
for
proper
frequency
compensation.
TRACE
POSITION
This
control
normally
adjusts
the
vertical
position
of
the
trace.
The
CHANNEL
B
TRACE
POSITION
control
becomes
a
horizontal
position
control
in
the
VECTOR
function.
\
REAR
PANEL
INPUTS
and
CONTROLS
Access
to
the
vertical
deflection
plates,
the
“Z”
axis
input
and
a
sweep
output
signal
are
all
available
on
the
rear
access
panel
of
the
PS163.
SWEEP
OUT
This
is
a
15
volt
peak
to
peak
negative
going
saw-
tooth
signal
with
frequency
determined
by
the
time
base
switch.
This
is
isolated
from
the
time
base
cir-
cuit
by
an
emitter
follower
for
protection.
Its
uses
include
coil
and
flyback
testing.
“Z”
AXIS
INPUT
The
Z
axis
input
is
used
when
you
desire
to
intensity
modulate
the
CRT
beam.
The
switch
to
the
right
of
the
yellow
jack
controls
the
input.
The
OFF
position
allows
normal
scope
operation
with
the
Z
AXIS
IN-
PUT
jack
disconnected.
The
ON
position
connects
the
Z
AXIS
INPUT
jack
to
the
cathode
of
the
CRT
through
an
isolation
capacitor.
This
switch
should
be
in
the
OFF
position
on
normal
scope
operation.
VERT.
DEF.
PLATES
These
jacks
provide
access
to
the
vertical
deflection
plates
of
the
CRT.
This
allows
the
251683
to
be
used
for
a
modulation
monitor
or
lab
experiments.
When
the
switch
directly
above
the
jacks
is
in
the
NORM
position,
the
jacks
are
disconnected.
This
is
the
switch
position
for
normal
scope
operation.
With
the
switch
in
the
EXT
position,
the
signal
fed
into
the
jacks
is
applied
to
the
vertical
deflection
plates.
The
front
panel
TRACE
POSITION
controls
position
the
beam
on
the
scope
screen.
10
ASTIGMATISM
CONTROL
This
control
is
adjusted
along
with
the
FOCUS
con-
trol
for
a
sharp
trace
in
the
center
of
the
oscilloscope
screen,
and
is
located
directly
below
the
rear
access
panel.
CIRCUIT
BREAKER
The
power
supply
of
the
PS163
incorporates
a
cir-
cuit
breaker
for
protection.
Should
a
power
supply
overload
occur,
the
breaker
will
trip.
Reset
by
press-
ing
red
button
fully
in
and
releasing.
SWEEP
OUT
EXT
للها
VERT
DEF
PLATES
Z
INPUT
OFF
ON
OPERATING
INSTRUCTIONS
INITIAL
FAMILIARIZATION
ل
This
section
contains
a
simple
procedure
that
you
can
use
to
get
acquainted
with
the
operation
of
the
con-
trols
on
the
PS163
oscilloscope.
SET
UP
1.
Plug
the
PS163
into
a
properly
grounded
AC
out-
let
and
slide
the
OFF
-
ON
switch
to
the
ON
position.
Note
the
indicator
directly
above
the
switch.
2.
Use
the
39G34
LOW
CAPACITY
PROBES
to
con-
nect
the
CAL.
VOLTS
2V
PP
output
to
the
CHANNEL
A
and
B
inputs.
3.
Set
the
front
panel
controls
as
follows:
SCALE
ILLUMINATION
GRID
HORIZONTAL
SYNC
INT.A
SYNC
POLARITY
POSITIVE
HORIZONTAL
SWEEP
AUTO
TRIGGERED
TIME
BASE
-
FREQUENCY
.5mSec./DIV
(Center
knob
full
clockwise)
VERTICAL
INPUT
DUAL
ALTERNATE
PPV
PER
DIV.
(A&B)
1V/DIV
Center
knob
full
clockwise
INPUT
COUPLING
(A&B)
AC
COUPLED
4.
Adjust
the
FOCUS
and
INTENSITY
controls
for
a
sharp
trace
with
useable
brightness:
Adjust
the
HORIZONTAL
POSITION
control
so
that
the
trace
starts
at
the
left
hand
edge
of
the
10x10
grid.
5.
Use
the
CHANNEL
A
TRACE
POSITION
control
to
center
the
CHANNEL
A
trace
in
the
upper
half
of
the
oscilloscope
screen,
and
the
CHANNEL
B
TRACE
POSITION
CONTROL
to
center
the
CHANNEL
B
trace
in
the
lower
half
of
the
oscilloscope
screen.
CONTROL
FUNCTIONS
DUAL
CHANNEL
VERTICAL
INPUT
Press
the
A
and
B
VERTICAL
INPUT
buttons.
Note
that
with
the
A
button
pushed,
only
the
CHANNEL
A
waveform
is
displayed.
The
CHANNEL
B
wave-
form
is
displayed
when
the
B
button
is
pressed.
Press
the
DUAL
ALTERNATE
and
DUAL
CHOPPED
buttons
and
note
that
both
the
CHANNEL
A
and
CHANNEL
B
waveforms
are
displayed.
(When
the
chopped
button
is
pushed,
the
waveform
may
not
be
stable.
This
is
due
to
the
influence
of
the
100KHz
chopping
signal
on
the
trigger
circuit
when
in
the
AUTO
TRIGGERED
mode.)
Press
the
VECTOR
A&B
INPUTS
button,
and
note
that
the
display
is
now
two
dots
connected
by
a
dim
line.
Adjust
the
CHANNEL
A
TRACE
POSITION,
and
the
CHANNEL
B
TRACE
POSITION
controls,
and
note
that
the
CHANNEL
A
TRACE
POSITION
effects
the
vertical
position
of
the
display,
and
that
the
CHANNEL
B
TRACE
POSITION
effects
the
horizontal
position
of
the
display.
Slide
the
SCALE
ILLUMINATION
switch
to
the
VECTOR
position,
and
note
that
the
scale
is
now
illuminated
for
the
standard
10
bar
color
TV
vector
pattern.
Return
the
SCALE
ILLUMINATION
switch
to
the
GRID
position,
and
press
the
A
VERTICAL
INPUT
button.
HORIZONTAL
SWEEP
and
SYNC
Press
the
MANUAL
TRIGGERED
HORIZONTAL
SWEEP
button,
and
adjust
the
SYNC
LEVEL
control
for
a
locked
in
pattern.
Note
the
range
of
rotation
of
the
SYNC
LEVEL
control
that
produces
a
trace.
Tum
the
CHANNEL
A
PPV
PER
DIV
switch
to
the
10
position,
and
again
adjust
the
SYNC
LEVEL
control.
Note
the
range
of
rotation
that
produces
a
trace
is
narrower
than
before.
Turn
the
CHANNEL
A PPV
PER
DIV
switch
to
the
100
position,
and
try
to
adjust
the
SYNC
LEVEL
con-
trol
for
a
trace.
Note
that
with
this
small
of
a
deflec-
tion
on
the
screen
it is
nearly
impossible
to
obtain
a
trace
in
the
MANUAL
TRIGGERED
MODE.
Press
the
INT.
B
HORIZONTAL
SYNC
button,
and
note
that
the
range
of
the
SYNC
LEVEL
control
is
now
the
same
as
when
the
CHANNEL
A
PPV
PER
DIV.
switch
was
set
to
the
1V/DIV.
This
shows
that
even
though
CHANNEL
A
is
the
displayed
channel,
sync
may
still
be
taken
from
the
channel
not
displayed,
in
this
case
CHANNEL
B.
Press
the
EXT.
HORIZONTAL
SYNC
button,
and
con-
nect
a
jumper
wire
from
the
CAL.
VOLTS
2V
PP
out-
put
to
the
EXTERNAL
TRIGGER
jack.
Adjust
the
SYNC
LEVEL
control,
and
note
the
range
that
pro-
duces
trace.
This
shows
the
sensitivity
of
the
PS163
to
an
external
trigger
signal.
Press
the
AUTO
TRIGGERED
HORIZONTAL
SWEEP
button,
and
the
INT.
A
HORIZONTAL
SYNC
button.
Note
that
the
trace
now
appears
on
the
screen.
This
is
the
advantage
of
the
AUTO
TRIGGERED
mode.
A
trace
will
be
produced
even
in
the
absence
of
a
signal.
a
Turn
the
CHANNEL
A
PPV
PER
DIV
switch
back
to
the
1
position,
and
slide
the
SYNC
POLARITY
switch
back
and
forth
between
the
POSITIVE
and
NEG-
ATIVE
positions.
Note
that
with
the
SYNC
PO-
LARITY
switch
in
the
POSITIVE
position,
the
first
half
cycle
of
the
displayed
square
wave
is
positive,
and
with
the
switch
in
the
NEGATIVE
position
the
first
half
cycle
is
negative.
Turn
the
TIME
BASE
-
FREQUENCY
switch
counter-
clockwise
to
the
10mSec/DIV
position,
and
back
clockwise
to
the
.lmSec./DIV
position.
Note
that
the
slower
the
sweep
speed,
the
larger
the
number
of
displayed
cycles
and
the
faster
the
sweep
speed,
the
lower
the
number
of
displayed
cycles.
Leave
the
TIME
BASE
-
FREQUENCY
switch
set
to
.1mSec/
DIV.
Press
the
FREE
RUNNING
HORIZONTAL
SWEEP
button,
and
note
how
the
sweep
loses
sync.
Adjust
the
small
center
knob
of
the
TIME
BASE
-
FRE-
QUENCY
switch
to
lock
in
the
square
wave.
Note
that
in
the
FREE
RUNNING
mode
the
horizontal
sweep
is
the
same
as
on
a
conventional
sync
sweep
scope.
The
horizontal
sweep
frequency
must
be
ad-
justed
for
a
whole
number
of
cycles
of
the
displayed
waveform.
Press
the
AUTO
TRIGGERED
HOR-
IZONTAL
SWEEP
button,
and
return
the
small
knob
on
the
TIME
BASE
-
FREQUENCY
switch
to
the
full
clockwise
position.
5X
MAGNIFIER
Turn
the
TIME
BASE
-
FREQUENCY
switch
to
the
.-omSec/DIV
position,
and
adjust
the
small
center
knob
for
10
cycles
of
the
displayed
waveform
in
10
divisions
(one
division
per
cycle).
Pull
on
the
HOR-
IZONTAL
POSITION
control
to
activate
the
5X
EXPAND.
Note
that
one
cycle
of
the
squarewave
now
occupies
5
divisions.
Push
the
HORIZONTAL
POSITION
knob
back
in,
and
adjust
it
so
that
the
trace
starts
back
at
the
left
hand
edge
of
the
10x10
grid.
Return
the
small
center
knob
to
the
full
clock-
wise
calibrated
position.
INPUT
COUPLING
Slide
the
CHANNEL
A
INPUT
COUPLING
switch
to
the
center
ground
position,
and
adjust
the
CHAN-
NEL
A
TRACE
POSITION
control
so
that
the
trace
is
directly
on
the
major
horizontal
grid
line.
Slide
the
switch
to
the
AC
COUPLED
position
and
note
that
the
square
wave
is
two
divisions
high,
and
that
it
is
centered
around
the
major
horizontal
grid
line.
Slide
the
switch
to
the
DC
COUPLED
position.
Note
that
the
square
wave
is
still
two
divisions
high,
but
12
that
it
is
now
two
divisions
above
the
major
hor-
izontal
grid
line.
This
indicates
that
the
Cal
VOLTS
2
V
PP
signal
is
changing
from
zero
to
positive,
and
back
to
zero
gain.
TV
Vertical
and
TV
Horizontal
Connect
a
stable
color
bar
generator
such
as
the
Sen-
core
CG159
to
the
antenna
terminals
of
a
properly
operating
television
receiver.
Turn
the
pattern
selector
of
the
color
bar
generator
to
the
crosshatch
pattern,
and
adjust
the
receivers
fine
tuning,
brightness
and
contrast
controls
to
properly
display
the
crosshatch
pattern.
Use
the
39G34
LO
CAP
PROBE
to
connect
the
PS163
CHANNEL
A
input
to
the
base
or
control
grid
of
the
first
video
amplifier
stage.
Adjust
the
con-
trols
on
the
25163
as
follows:
HORIZONTAL
SYNC
INT.A
HORIZONTAL
SWEEP
AUTO
TRIGGERED
TIME
BASE
-
FREQUENCY
TV
V
VERTICAL
INPUT
A
CHANNEL
A
PPV
PER
DIV
1V/DIV
INPUT
COUPLING
AC
COUPLED
Set
the
SYNC
POLARITY
switch
to
the
POSITIVE
position
if
the
sync
pulses
at
the
test
point
are
pos-
itive,
and
to
the
NEGATIVE
position
if
the
sync
pulses
are
negative.
Turn
the
TIME
BASE
-
FREQUENCY
switch
to
the
TV
H
position,
and
note
that
in
either
the
TV
H
or
TV
V
sweep
positions,
the
composite
video
wave-
form
remains
stable.
Turn
the
color
bar
generator
pattern
selector
to
the
color
bar
position,
and
pull
on
the
25163
HORIZON-
TAL
POSITION
knob.
Rotate
the
HORIZONTAL
POSITION
control
and
note
the
expanded
waveform.
Push
the
HORIZONTAL
POSITION
knob
back
in,
and
adjust
the
HORIZONTAL
POSITION
control
so
the
waveform
starts
at
the
left
hand
edge
of
the
10x10.
grid.
60
Cycle
Sweep
Use
the
3934
LO
CAP
PROBE
to
connect
approx-
imately
6.3
volts
AC
60Hz
from
a
filament
circuit
in
the
receiver
to
the
CHANNEL
A
input.
Turn
the
TIME
BASE
-
FREQUENCY
control
to
60
Hertz
sweep.
Adjust
the
CHANNEL
A
PPV
PER
DIV
switch
for
about
8
divisions
of
vertical
deflection.
.
Adjust
the
LINE
SWEEP
PHASE
control
and
note
Use
the
probe
to
be
compensated
to
connect
the
CAL.
how
this
control
effects
the
phase
relationship
be-
VOLTS
2V
PP
to
the
selected
channel,
and
adjust
the
tween
the
input
signal
and
the
internal
60
cycle
line
INTENSITY,
FOCUS,
HORIZONTAL
POSITION,
sweep.
and
TRACE
POSITION
controls
for
a
sharp
viewable
trace
near
the
center
of
the
10
x
10
grid.
Adjust
1
Turn
the
small
center
knob
of
the
TIME
BASE
-
for
a
square
wave
with
a
flat
top.
If
C1
is
over
com-
FREQUENCY
switch
counter
-
clockwise
until
the
pensated,
the
square
wave
will
have
a
peak
on
the
lead-
display
is
two
horizontal
divisions
wide,
and
note
that
ing
edge.
If
C1
is
under
compensated,
the
corner
of
this
control
now
functions
as
a
horizontal
gain
con-
the
square
wave
will
be
rounded.
trol.
Pull
on
the
HORIZONTAL
POSITION
knob,
and
note
that
the
5X
EXPAND
functions
in
the
60
cycle
sweep
function.
Push
the
HORIZONTAL
POSITION
knob
back
in,
and
return
the
small
knob
of
the
TIME
BASE
-
FREQUENCY
switch
to
its
full
clockwise
cal-
ibrated
position.
EXT.
Horizontal
Sweep
Connect
a
jumper
wire
from
the
CAL.
VOLTS
2V
PP
output
to
the
EXTERNAL
HORIZONTAL
jack.
Turn
the
TIME
BASE
-
FREQUENCY
switch
to
the
EXT
position.
Note
that
the
horizontal
sweep
is
now
pro-
vided
by
the
external
signal.
Turn
the
small
center
Cl
OVER
COMPENSATED
knob
of
the
TIME
BASE
-
FREQUENCY
switch
counter
-
clockwise
until
the
display
is
two
divisions
wide,
and
note
this
control
now
functions
as
a
hor-
izontal
gain
control.
Pull
on
the
HORIZONTAL
POSITION
knob,
and
note
that
the
5X
EXPAND
also
functions
in
the
EXT.
Horizontal
sweep
function.
PROBE
COMPENSATION
The
39G34
low
capacity
probe
contains
an
adjust-
able
compensation
capacitor
(C1
on
the
schematic).
The
adjustment
of
this
capacitor
should
be
checked
frequently
to
insure
accurate
square
wave
reproduc-
tion.
The
setup
for
adjusting
this
capacitor
is
as
swe:
Cl
UNDER
COMPENSATED
HORIZONTAL
SYNC
INT
A
or
INT
B
SYNC
POLARITY
POSITIVE
HORIZONTAL
SWEEP
AUTO
TRIGGERED
TIME
BASE
-
FREQUENCY
.5mSec/DIV
VERTICAL
INPUT
CHANNEL
A
or
CHANNEL
B
(must
be
the
same
as
HOR-
IZONTAL
SYNC
above).
PPV
PER
DIV
.5V/DIV
CI
CORRECTLY
ADJUSTED
2
7
taba
Area
nh
Sa
Marea
Fig.
1.
Effect
of
C1
on
square
wave
response.
13
APPLICATIONS
AC
VOLTAGE
MEASUREMENT
The
measurement
of
AC
voltages
is
one
of
the
more
important
uses
for
an
oscilloscope.
The
calibrated
in-
puts
of
the
PS163
make
possible
very
accurate
mea-
surements
using
the
following
procedure:
1.
Use
one
of
the
39G34
LO
CAP
PROBES
to
con-
nect
the
signal
to
be
measured
to
either
the
CHANNEL
A
or
B
input.
If
the
amplitude
of
the
voltage
to
be
measured
is
in
doubt,
start
with
the
PPV
PER
DIV.
switch
set
to
the
500
position.
Set
the
INPUT
COUPLING
switch
to
the
AC
COUPLED
position.
2.
Adjust
the
controls
on
the
PS163
to
display
ap-
proximately
two
cycles
of
the
signal,
with
an
amp-
litude
of
at
least
one
vertical
division.
3.
Use
the
10
x10
grid
to
measure
the
vertical
distance
between
the
points
on
the
waveform
that
you
wish
to
measure.
Be
sure
that
the
small
center
knob
of
the
PPV
PER
DIV
switch
is
turned
full
clockwise.
When
measuring
small
voltages,
the
width
of
the
trace
can
be
a
significant
part
of
the
total
distance,
so
make
all
measurements
from
the
same
side
of
the
trace.
4.
Multiply
the
distance
measured
by
the
setting
of
the
PPV
PER
DIV
switch.
The
result
is
the
voltage
between
the
two
points
measured.
In
the
composite
video
waveform
shown
in
Fig.
2,
the
total
distance
from
the
tip
of
the
sync
pulse
to
the
most
negative
point
is
2.2
divisions.
The
setting
of
the
PPV
PER
DIV
switch
is
1
VOLT/DIV,
so
the
total
peak
to
peak
amplitude
of
the
signal
is
2.2VP-P.
The
distance
from
the
tip
of
the
sync
pulse
to
the
blanking
pedestal
is
1
division
so
the
amplitude
of
the
sync
pulse
is
1V.
Fig.
2.
Measuring
peak-to-peak
voltages.
DC
VOLTAGE
MEASUREMENT
The
use
of
the
DC
coupled
scope
to
measure
both
DC
as
well
as
AC
signals
can
speed
servicing
in
many
cir-
14
cuits,
especially
solid
state.
With
the
DC
coupled
scope,
servicing
can
be
faster
as
you
will
not
need
to
keep
switching
back
and
forth
between
the
scope
and
the
DC
voltmeter.
Here
are
two
handy
methods
of
making
DC
voltage
measurements
with
the
PS163.
SINGLE
TRACE
METHOD
1.
Set the
VERTICAL
INPUT
to
CHANNEL
A
and
the
INPUT
COUPLING
switch
to
the
center
ground
position.
2.
Use
the
CHANNEL
A
TRACE
POSITION
control
to
center
the
trace
on
the
major
horizontal
grid
line
of
the
scope
graticule.
|
3.
Set
the
coupling
switch
to
DC
and
connect
the
probe
to
the
point
where
the
signal
is
to
be
measured.
Start
with
PPV
PER
DIV.
switch
set
to
500
VOLTS/
DIV
and
slowly
turn
the
switch
clockwise
until
the
trace
moves
up
or
down
between
three
and
four
centi-
meters.
An
upward
movement
indicates
a
positive
voltage,
a
downward
movement
a
negative
voltage.
4.
Note
the
number
of
centimeters
or
divisions
the
trace
has
moved
from
the
center
graticule
line
and
multiply
this
by
the
setting
of
the
vertical
input
switch.
If
the
trace
moves
up
4
divisions
and
the
PPV
PER
DIV.
switch
is
set
to
10
volts/Div.,
the
volt-
age
would
be
10
volts/Div
x
4
Div
=
+40
volts.
NOTE:
CHANNEL
B
may
also
be
used
for
DC
voltage
mea-
surements.
DUAL
TRACE
METHOD
(Preferred)
Press
the
DUAL
ALTERNATE
VERTICAL
INPUT
button,
set
the
CHANNEL
A
PPV
PER
DIV.
switch
so
the
expected
voltage
at
the
point
to
be
measured
is
less
than
6
times
the
switch
setting,
set
both
the
CHANNEL
A
and
B
INPUT
COUPLING
switches
to
the
center
ground
position.
Adjust
the
CHANNEL
A
and
B
TRACE
POSITION
controls
so
both
traces
are
lined
up
with
the
major
horizontal
grid
line.
Connect
the
CHANNEL
A
probe
to
the
test
point,
and
slide
the
CHANNEL
A
INPUT
COUPLING
switch
to
the
DC
Position.
Count
the
number
of
divisions
up
or
down
the
CHANNEL
A
trace
moves
and
multiply
by
the
setting
of
the
PPV
PER
DIV.
switch.
If
the
CHANNEL
A
trace
moves
down
3.4
divisions
and
the
PPV
PER
DIV.
switch
is
set
to
.2
VOLTS/DIV.,
the
measured
voltage
is
.2
VOLTS/DIV.x-3.4
Div
=
-.68
volts.
MEASURING
THE
DC
LEVEL
of
an
AC
SIGNAL
The
DC
level
of
an
AC
signal
is
often
more
important
than
the
actual
signal
amplitude.
The
DC
coupled
PS163
makes
the
critical
level
measurements
ac-
curately
using
the
following
procedure.
Follow
the
set
up
procedure
for
the
Dual
Trace
Methods
of
DC
voltage
measurements.
In
the
com-
posite
video
waveform
in
Fig.
3,
the
DC
level
of
the
blanking
level
is
2
divisions
at
1
volt/Div.
or
2
volts.
The
DC
level
of
the
top
sync
pulses
is
3
divisions,
or
3
volts.
The
DC
level
of
the
negative
tips
of
the
video
information
is
1
division
at
1
volt
per
division
or
1
volt.
Er
E
ee
oe
ee
ee?
ee
ee
هد
eee
E E
See eee
ee
eee
E
E
HE
ا«
A
Fig.
3.
Measuring
DC
level
of
video
signal.
COMPARISON
OF
VOLTAGES
In
some
cases,
such
as
a
stereo
amplifier,
a
comparison
of
a
good
working
channel
to
the
defective
channel
is
a
quick
way
of
establishing
the
defective
stage
or
component.
The
Dual
Trace
PS163
is
an
ideal
in-
strument
for
this
purpose.
1.
Set
the
scope
to
AUTO
TRIGGERED
and
press
the
DUAL
ALTERNATE
button
on
the
VERTICAL
INPUT
switch.
Use
the
TRACE
POSITION
controls
to
set
each
trace
to
the
same
reference
point
on
the
scope
grid.
2.
Use
CHANNEL
A
on
the
working
channel
as
your
reference
and
CHANNEL
B
on
the
defective
section.
Connect
both
probes
to
the
same
point
in
each
unit
or
amplifier,
as
shown
in
Fig.
4.
3.
Note
the
deflection
of
the
CHANNEL
A
and
the
CHANNEL
Btraces.
They
should
be
the
same
or
very
close
if
there
is
no
defect
at
this
point.
When
the
CHANNEL
B
deflection
does
not
match
the
A
or
re-
ference
channel,
then
the
defective
stage
has
been
located.
COMPARISON
OF
DC
VOLTAGES
STEREO
AMPLIFIER
GOOD
CHANNEL
INPUT
OUTPUT
—
CONNECT
PSI63
CHANNEL
A
HERE
CONNECT
PS
163
CHANNEL
B
HERE
DEFECTIVE
CHANNEL
Fig.
4.
Comparing
voltages
in
stereo
amplifier.
COMPARISON
of
AC
SIGNALS
The
same
technique
as
above
can
be
used
to
observe
AC
signals
to
locate
a
defective
stage.
1.
Use
the
TRACE
POSITION
controls
to
center
the
CHANNEL
A
trace
in
the
upper
half
of
the
10
x
10
grid,
and
the
CHANNEL
B
trace
in
the
lower
half
of
the
10
x
10
grid.
Use
sync
from
CHANNEL
A.
2.
Connect
CHANNEL
A
to
the
desired
test
point
in
the
working
channel
and
adjust
the
PS163
controls
for
a
viewable
waveform.
Set
the
CHANNEL
B
PPV
PER
DIV
switch
to
the
same
setting
and
connect
it
to
the
same
test
point
in
the
other
channel.
The
same
amplitude
waveform
should
be
observed.
If
a
dif-
ference
exists,
then
you
have
located
the
defective
area
in
the
chassis.
LOCALIZATION
of
INTERMITTENTS
An
intermittent
condition
is
the
most
difficult
to
locate
problem
in
any
piece
of
electronic
equipment.
In
many
cases
the
trouble
disappears
as
you
try
to
make
a
measurement.
The
normal
troubleshooting
procedure
with
only
one
scope
can
waste
much
value-
able
time
as
you
are
only
able
to
observe
one
test
point
at
a
time.
A
dual
trace
oscilloscope
such
as
the
Sencore
PS163
allows
you
to
observe
two
test
points
at
the
same
time,
and
thus
cut
the
time
that
it
takes
to
locate
the
intermittent
condition
in
half.
Use
the
example
of
Fig.
5
with
the
following
procedure
to
locate
an
intermittent
problem
in
a
5
stage
amplifier.
1.
In
the
first
step,
connect
the
CHANNEL
A
probe
to
the
input
of
Stage
1,
and
the
CHANNEL
B
probe
to
the
output
of
stage
5.
Observe
the
output
of
stage
5
and
the
input
to
stage
1
both
before
and
after
the
intermittent
occurs.
The
15
STEP
|
CHANNEL
A
CHANNEL
B
STEP
2
5
STAGE
AMPLIFIER
Fig.
5.
System
for
isolating
intermittents.
output
of
stage
5
should
change,
while
the
input
to
stage
1
should
remain
the
same.
2.
Step
2,
connect
the
CHANNEL
A
probe
to
the
in-
put
of
stage
2,
and
the
CHANNEL
B
probe
to
the
out-
put
of
stage
4.
Observe
the
two
waveforms
both
be-
fore
and
after
the
intermittent
occurs.
If
the
input
to
stage
2
remains
the
same,
and
the
output
of
stage
4
changes,
proceed
with
step
3. If
both
the
waveforms
change,
the
intermittent
is
located
in
stage
1.
If
both
waveforms
remain
unchanged,
the
intermittent
is
located
in
stage
5.
3.
Step
3,
connect
the
CHANNEL
A
probe
to
the
in-
put
of
stage
3
and
the
CHANNEL
B
probe
to
the
out-
put
of
stage
3.
If
the
output
of
stage
3
changes
and
the
input
remains
the
same,
the
intermittent
is
located
in
stage
3.
If
the
input
and
output
of
stage
3
both
change,
the
intermittent
is
located
in
stage
2.
If
both
the
input
and
output
of
stage
3
remain
the
same,
the
intermittent
is
located
in
stage
4.
Once
the
intermittent
stage
is
located,
monitor
the
input
and
output
of
that
stage.
Check
each
compon-
ent
by
heating
it,
cooling
it
or
lightly
tapping
on
it.
The
intermittent
component
will
cause
the
output
of
that
stage
to
change.
GAIN
and
DISTORTION
MEASUREMENTS
The
gain
and
distortion
of
circuits
such
as
a
solid
state
audio
amplifier
are
important
service
as
well
as
de-
sign
considerations.
The
Dual
Trace
25163
is
an
ideal
instrument
for
these
measurements.
GAIN
MEASUREMENTS
The
small
center
knobs
of
both
PPV
PER
DIV
switches
must
be
in
the
full
clockwise
calibrated
position
to
measure
gain.
1.
Apply
a
signal
to
the
input
of
the
amplifier,
and
monitor
this
signal
with
CHANNEL
A.
2.
Connect
CHANNEL
B
to
the
output
of
the
am-
16
plifier,
and
adjust
the
input
signal
so
no
clipping
occurs
in
the
output
waveform.
3.
Measure
the
peak
to
peak
amplitude
of
the
input
and
output
signals
and
divide
the
output
signal
by
the
input
signal.
For
example,
if
the
input
signal
is
.25
VP-P
and
the
output
is
1.5VP-P,
the
gain
is
1.5
di-
vided
by
.25
or
a
gain
of
6.
DISTORTION
MEASUREMENTS
Once
set
up
to
measure
gain
it
is
a
simple
matter
to
also
check
for
distortion.
1.
Adjust
the
PS163
controls
including
the
small
center
knob
of
the
PPV
PER
DIV
switch,
to
super-
impose
the
CHANNEL
A
and
B
traces.
2.
Observe
the
two
waveforms.
They
should
be
ex-
actly
the
same.
A
difference
between
the
input
and
output
waveform
indicates
distortion
in
the
amplifier.
(See
also
SQUARE
WAVE
TESTING).
TIME
and
FREQUENCY
MEASUREMENTS
The
following
sections
outline
several
methods
of
measuring
time
and
frequency.
The
versatility
of
the
PS163
makes
text
book
results
possible
on
even
the
most
complex
procedures.
TIME
MEASUREMENTS
USING
THE
CALIBRATED
TIME
BASE
The
calibrated
time
base
method
of
measuring
fre-
quency
is
the
easiest
one
to
use,
because
the
only
equipment
needed
is
the
PS163.
1.
Connect
the
signal
to
be
measured
to
either
the
CHANNEL
A
or
B
input
of
the
25163.
and
adjust
the
controls
of
the
PS163
to
display
one
or
two
cycles
of
the
signal.
Use
AUTO
TRIGGERED
HORIZONTAL
SWEEP
and
be
sure
that
the
small
center
knob
of
the
TIME
BASE
-
FREQUENCY
switch
is
in
the
full
clockwise
position.
2.
Use
the
10x10
grid
to
measure
the
horizontal
dis-
tance
between
the
two
points
that
you
wish
to
mea-
sure.
3.
Multiply
the
distance
measured
by
the
setting
of
the
TIME
BASE
-
FREQUENCY
SWITCH.
Fig.
6
shows
the
waveform
at
the
grid
of
the
hor-
izontal
output
tube
in
a
television
receiver.
The
width
of
the
negative
going
pulse
measured
between
points
B
and
C
is
1.1
divisions.
The
setting
of
the
TIME
BASE
-
FREQUENCY
switch
is
10uSec/DIV,
so
this
pulse
is
1luSec
wide.
The
horizontal
distance
for
one
™
complete
cycle
of
the
drive
signal,
as
measured
be-
tween
points
A
and
C
is
6.3
divisions,
so
one
complete
cycle
is
63uSec
long.
10
uSec./
DIV
Fig.
6.
Time
measurement
with
PS163.
FREQUENCY
MEASUREMENTS
USING
CALIBRATED
TIME
BASE
The
formula
for
finding
frequency
if
time
is
known
is:
ٍ
ل
NEE
=
nn
Time
in
seconds
for
one
cycle
The
time
for
one
cycle
in
Fig.
6
was
63
uSec.,
or
.000063
seconds.
1
divided
by
.000063
equals
15,850Hz,
or
very
close
to
the
horizontal
frequency
of
15,750Hz.
FREQUENCY
MEASUREMENTS
USING
LISSAJOUS
FIGURES
The
sensitivity
and
bandwidth
of
the
PS163
VECTOR
mode
allow
this
type
of
measurement
to
be
made
from
even
the
output
of
an
RF
generator
up
to
5MHz.
1.
Connect
the
known
frequency
to
the
CHANNEL
B
input,
and
the
unknown
frequency
to
the
CHANNEL
A
input.
2.
Press
the
VECTOR
VERTICAL
INPUT
button,
and
adjust
the
PS163
controls
so
that
the
entire
pattern
is
visable
on
the
screen.
3.
Adjust
the
known
signal
frequency
so
that
the
pattern
holds
steady,
and
count
the
number
of
vert-
ical
and
horizontal
loops.
4.
Use
the
following
formula
to
find
the
unknown
frequency.
Known
frequency
X
Number
of
hor.
loops
Number
of
vert.
loops
The
examples
of
Fig.
7
show
several
patterns,
and
the
frequency
that
they
represent.
The
known
fre-
quency
used
in
the
example
is
600Hz.
OOD
CLM)
UNKNOWN
UNKNOWN
UNKNOWN
1200
Hz
1800
Hz
2400Hz
KNOWN
AND
UNKNOWN
FRE-
QUENCIES
300Hz
UNKNOWN
200
Hz
UNKNOWN
150
Hz
Fig.
7.
Typical
Lissajous
patterns.
FREQUENCY
MEASUREMENTS
USING
THE
MODULATED
RING
The
VECTOR
mode
of
the
25163
and
the
“Z”
Axis
input,
are
used
to
obtain
a
modulated
ring
pattern.
Simply
count
the
number
of
segments
and
multiply
by
the
known
frequency
to
find
the
unknown.
This
method
will
only
work
where
the
unknown
frequency
is
higher
than
the
known
frequency.
1.
Connect
the
signal
generator
to
a
phase
shift
net-
work
as
shown
in
Fig.
8.
The
network
shown
is
for
audio
frequencies
and
the
component
values
may
need
to
be
reduced
for
higher
frequencies.
KNOWN
SIGNAL
GENERATOR
UNKNOWN
FREQUENCY
70
"2*
AXIS
INPUT
Fig.
8.
Connections
for
frequency
measurements
using
modulated
ring
method.
2.
Connect
the
PS163
as
shown
and
press
the
VEC-
TOR
VERTICAL
INPUT
button.
17
3.
Adjust
the
control
in
the
network
until.a
circle
or
a
near
circle
is
obtained
on
the
scope
screen.
4.
Apply
the
unknown
frequency
to
the
rear
“Z”
Axis
jack
on
the
PS163,
and
slide
the
“Z”
AXIS
switch
to
the
ON
position.
Adjust
the
generator
until
the
pattern
stands
still.
Count
the
number
of
line
segments,
and
multiply
the
known
frequency
by
the
number
of
segments
to
find
the
unknown
frequency.
The
11
segments
shown
in
Fig.
9
indicate
that
the
unknown
is
higher
than
the
known
frequency.
Note
that
the
shape
of
the
overall
circle
is
dependent
upon
the
phase
shift
network
and
not
the
frequencies
in-
volved.
Tt
P
=
3
+
S)
t
Ji
++
GR;
ua
+
١
i
١
|
1
A
سے
å
کد
+
|
|11
Segments,
|
Fig.
9.
Modulated
ring
showing
unknown
frequency
11
times
the
known
frequency.
PHASE
SHIFT
and
TIME
DELAY
MEASUREMENTS
There
are
two
methods
of
measuring
the
phase
shift
or
time
delay
between
two
signals.
The
first
method
is
to
measure
the
time
delay
between
the
two
signals,
and
compare
this
to
the
total
time
of
one
cycle
to
find
the
phase
shift.
The
second
method
is
to
use
a
Lissa-
jous
figure
to
measure
the
phase
directly.
The
first
method
is
most
useful
where
the
timing
between
pulses,
such
as
in
color
TV,
is
critical.
The
second
method
is
most
useful
in
amplifiers
where
a
phase
shift
can
cause
a
distorted
output.
TIME
DELAY
BETWEEN
SIGNALS
1.
Use
DUAL
ALTERNATE
VERTICAL
INPUT,
AUTO
TRIGGERED
HORIZONTAL
SWEEP,
and
INT.
A
HORIZONTAL
SYNC.
1
a
+
1
:
2.
Connect
CHANNEL
A
to
the
input
or
nonadjust-
able
signal.
Connect
CHANNEL
B
to
the
other,
and
adjust
the
251683
controls
for
two
cycles
of
informa-
tion
as
shown
in
Fig.
10.
The
actual
time
delay
be-
tween
the
two
signals
can
be
measured
as
follows:
18
Fig.
10.
Determining
time
delay
between
signals.
Count
the
number
of
horizontal
divisions
between
the
same
points
on
the
two
waveforms.
(A
to
B).
Multiply
this
distance
by
the
setting
of
the
TIME
BASE
-
FREQUENCY
switch.
In
this
example
the
distance
is
%
division,
the
switch
setting
is
.lmSec/
DIV,
and
the
actual
time
delay
is
.05
milliseconds.
The
total
time
for
one
360
degree
cycle
in
Fig.
10
is
.6mSec.
The
phase
difference
can
be
found
with
the
following
formula.
Time
Delay
Angle
=
=
©
6
Period
of
one
cycle
Angle
=
E
x
360
Angle
=
30°
PHASE
SHIFT
BETWEEN
SIGNALS
The
closely
matched
horizontal
and
vertical
channels
of
the
PS163
VECTOR
mode
allow
this
type
of
mea-
surement
to
5MHz.
1.
Press
the
VECTOR
VERTICAL
INPUT
button
and
AC
couple
CHANNEL
A
to
one
of
the
signals.
Adjust
the
CHANNEL
A
PPV
PER
DIV
and
trace
position
for
a
vertical
line
four
divisions
high
centered
on
the
scope
screen.
2.
Disconnect
CHANNEL
A
and
AC
couple
CHAN-
NEL
B
to
the
second
signal.
Adjust
the
CHANNEL
B
PPV
PER
DIV
and
TRACE
POSITION
controls
for
a
horizontal
line
four
division
long
a
horizontal
line
four
division
long
centered
on
the
scope
screen.
3.
Reconnect
CHANNEL
A
to
the
first
signal
and
use
the
following
formula
to
find
the
phase
angle.
For
Fig.
11.
3
Table of contents
Other Sencore Test Equipment manuals
Popular Test Equipment manuals by other brands
Eddyfi Technologies
Eddyfi Technologies Ectane 3 user manual
Keithley
Keithley 263 instruction manual
Apposite
Apposite Netropy N91 quick start guide
pico Technology
pico Technology PicoScope 6000 Series Calibration and Verification Procedure
Bacharach
Bacharach Fyrite Pro Operation & maintenance guide
Midtronics
Midtronics CPX-900 EU Software update procedure
