Operating Instructions-58
12N
simultaneously on a tim
e
·
s
h
are
d
basis established by t
h
e
electronic switching circuit in
the
oscilloscope main
fr
am
e.
Of
the
fou
r
available time slot
s
p
ro
vi
d
ed
by
t
he
mainframe,
two ar
e
allocated to the A T
i
m
e Base
and two are allocated
to the B Time Base in an A·A·B·B,
e
tc.
,
sequence. This
allows a
s
ig
n
a
l to
be d
is
p
l
a
y
e
d at two different sweep
rates,
or two s
i
gnal
s
to be
d
i
s
p
la
ye
d at independent sweep rates.
The vertical switching sequence is discussed
in
th
e
5100·
seri
e
s
Oscilloscope System manual.
Either
the Alt
e
rn
a
t
e
or
Chop
d
is
p
l
a
y
modes can be used. In general, the Alternate
mode is most useful at t
h
e
faster s
w
e
ep
rates, and
the
Chop
mod
e
is most
u
s
e
ful at the slower sweep rates
or when the
two sweep rates are significantly d
i
f
f
e
r
e
n
t
.
A built
·
in trace
separation feature automatically deflects the A
sweep
dow
n
war
d
about two divisions when the dual·sweep mode
is
selected, which separates a
si
n
g
l
e
-
trace baseline. The
front-panel INTEN BAL control is pro
vi
de
d
to balance the
intensity levels of t
he
A and B sweeps for best viewing or
photography.
In
ad
d
it
i
on to in
d
ep
en
d
e
nt dual-sweep operation, this
mode can also be
u
s
e
d
for
simultaneous d
i
s
p
la
y
of d
ep
e
n
d
ent
sweeps (
d
e
l
ay
i
n
g
an
d
dela
y
ed sw
ee
p
s).
Delayed Sweep.
When
t
h
e
A INTEN-B DL Y'D
button of
the
MODE s
w
i
t
c
h
is
pushed in,
a d
e
laye
d swee p mode is
established.
This butto
n
is used in con
j
u
n
c
t
io
n with
the A
and 8 buttons as described previously
to
d
i
spl
a
y
the
desired
,
time base. In
the
delayed sweep mode,
the
B Time B
a
se
'
p
r
o
v
ides
the
delayed sweep,
which
s
t
a
r
ts
after a
time
i
n
terval provided by the A Time Base (
d
ela
y
i
n
g sw
e
e
p
)
.
The
sweep rate of the
delayed sweep (B) i
s
determined by t
h
e B
SECONDS/DIV switch s
e
t
t
i
ng
.
The
dela
y
time is the inter
val between the start of
the
A
sw
ee
p
and
th
e start
of
t
he
B
sw
e
e
p
.
It
is determined by the A SECONDS/DIV switc
h
setting
and
the
DELAY TIME MUL
T
dial setting.
NOTE
The delay
time
is not
absolute,
due to the inherent
delay of
up
to
500
nanoseconds
in
the start of the
delayed sweep.
A displayed A sw
e
ep
appears
w
i
th a
p
o
rtion of the t
r
ace
intensified when the
A INTEN·B D LY'D button is
p
ushed
in. The intensified zone
(
p
ro
d
uc
e
d
by
t
h
e B sweep) is th
e
portion of
the
A sw
e
e
p
that will be
d
is
p
la
y
e
d
by the B
sweep. Refer to Fig.
1-1. The
l
e
n
g
t
h
of the
i
nt
en
si
f
i
e
d
por
tio
n
is about
10
t
i
m
e
s the s
e
t
tin
g of the 8 SECONDS/DIV
switch;
th
us
,
it can
be
l
e
n
g
t
he
n
e
d
or shortened b
y
c
h
a
ng
i
n
g
the
8
sweep
rate. I
n
most
cases,
t
h
e
8
sweep should be
op
e
ra
t
e
d
at
a
f
as
te
r
rate
than
the A s
w
ee
p in the del ay
e
d
swe e p
m
o
d
e
to
a
v
oid illo
g
ical
d
ispl
a
y
s
.
The delayed sweep
mode permits the differential delay
time between two dis
p
lay
e
d events to be accurately
1-5
measured. Points for differential time measurement are
selectable over the 10-division length of
the
A
sweep,
by
t
u
r
ni
n
g
the
DE LAY TIME MULT dial to position the
intensified zone to t
h
e points. The
p
oi
n
ts are displayed by
the B sweep, allowing the reference to be
p
r
e
cis
e
l
y
estab
lished. The DELAY
T
I
M
E
M U L T dial provides
re
a
d
i
n
g
s t
ha
t
co
r
res
p
ond to
the
distance from
the s
t
art of the A sweep to
the selected point (for exam
p
l
e
,
a dial reading of
2.95
indi
cates
2.95
g
r
ati
cu
l
e divisions). The
difference
between any
two dial readings, multiplied by
the
A SECONDS/DIV
switch
s
e
t
ti
n
g, is t
h
e
differential delay time.
When the 8
T R IG
AFTER DLY button
is
p
us
he
d
in,
the
delayed sweep mode is modified to
permit a
t
rigg
e
r
ed
8
sweep
which
is delayed for a s
e
l
e
ct
e
d
time (see Fig.
2-18).
Ins
t
e
a
d of
s
t
ar
t
i
ng exactly at t
he
point selected by the
DELAY TIME MU LT dial, the B
sweep
starts later when a
trigger puls
e
is received. The B TRIGGER SOURCE,
LEVE L, and S LOPE controls operate as described in
this
se
c
tio
n
un
d
er I
n
d
ep
e
n
de
n
t Sweep Operation.
T
he
8
Trig·
gerable After Delay mode
is
s
imil
ar
to the A Single Sweep
mode, in
t
ha
t
the B sweep is "armed" after the delay time,
but must be
t
r
igg
e
r
ed
independently.
Amplifier Mode
In some applications, it is desirable to
d
i
s
p
l
ay
one
signal
versus
another (X-Y) rather than against t
i
m
e (Y·Tl.
The
Am
p
l
i
f
i
er M od e
p
ro
v
ide
s
a means
for
a
pp
l
yi
n
g
an external
signal to
the
horizontal am
p
l
if
i
e
r for this
type
o
f d
is
p
l
a
y
.
When the A SECONDS/DIV or VOLTS/DIV s
wi
tch is
rotated counterclockwise into the VOL TS/DIV portion of
the
switch, the internal and line
tri
ggerin
g inputs
are
g
rou
nd
ed and the A swee
p
generator circuit is
d
i
sa
b
l
ed
(incl
u
ding the CRT blanking gate). The
external
sig
n
a
l
is
routed
t
h
rou
g
h
the amplifier portions of the circuitry and
made available to
t
h
e oscilloscope deflection system.
T
h
e e
x
t
e
rn
al s
i
g
n
als
may be
capacitive coupled (AC) or
direct
cou
p
l
e
d
(DC)
by using the A Coupling pushbutton;
however,
th e
r
emai
n
d
e
r
of
the
A
T R IG G E R I N G
s
wit
c
h
es
and controls located with in the dark green
area
on
the
front
p
a
n
el
are
disabled. Two cal
i
brat
e
d deflection factors ar
e
provided; 50
m
i
lli
v
ol
t
s
per division and 0.5
volt
per
divi·
s
i
on
.
The Variable control provides a co
n
t
inuo
u
sly
variable
1
X to
lOX
atte
n
uat
i
on of
the input
si
g
n
a
l
.
All of the B
Time Base triggering and
sweep circuits remain
fully oper
ab
l
e
, permitting simultaneous X-Y
and
Y-T displays (Chop
mode must be used
f
o
r
this type of display).
Summary of Contents for 5B12N
Page 4: ...Verso Filler Page z z...
