Section
1-2445A/2455A
Service
SPECIFICATION
INTRODUCl"ION
The
TEKTRONIX 2445A
and
2455A Oscilloscopes are
portable 150-MHz
and
250-MHz bandwidth instruments
having four-channel vertical deflection systems. Channel
1
and
Channel 2 provide calibrated deflection factors from
2
mV
per division to 5 V per division. For
each
of these
channels, input impedance is selectable between two
values:
either 1
þÿM©
in
parallel with 15
pF,
or þÿ50© internal
termination. Input-signal coupling with þÿ1 M©impedance
can
be
selected
as
either
AC
or
DC.
Channel
3
and
Chan-
nel
4
have
deflection factors of either
0.1
V or
0.5
V per
division.
Each
of these channels has
an
input impedance
of 1
þÿM©
in
parallel with
15
pF,
with
DC
input-signal
coupling.
The
trigger system works automatically for most sig-
nals.
They
operate
in
various modes, from
any
channel,
with couplings for a wide
range
of signals.
The
2445A
trigger system gives stable displays from
de
to 250 MHz.
The
2455A trigger system gives stable displays from
de
to
500
MHz.
The
horizontal deflection system provides calibrated
sweep speeds from 1.5 s per division to 1
ns
per division,
including the effects
of
the X10 magnifier
and
the
cali-
brated variable between
the
1-2-5 steps. Horizontal
displays include A Sweep, B Sweep
(delayed),
A alternated
with
B,
and
CH
1 (for X/Y displays).
The
AUTO,
SAVE,
and
RECALL features
save
time
and
prevent errors. Pressing the AUTO Setup button gives a
workable setup for almost
any
signal.
For
repetitive mea-
surements, the
Save
and
Recall
functions record
and
immediately or sequentially restore
as
many
as
30
instru-
ment setups.
The
SETUP buttons operate
all
instrument
functions, including the extended function options.
Direct, on-screen readouts of time measurements, volt-
age
measurements, scale factors, trigger levels,
and
auxili-
ary information also
save
time
and
improve operator
confidence.
The
instruments
are
shipped with
the
following stan-
dard accessories:
2 Probe packages
1 Snap-lock accessories pouch
1 Zip-lock accessories pouch
1 Operators
manual
1 Power cord (installed)
1
2-A, 250-V fuse
1 Clear plastic
CRT
filter
1 Blue plastic CRT filter (installed)
1 Front-panel cover
1 Operators pocket reference card
For part numbers
and
further information about both
standard
and
optional accessories, refer
to
"Options
and
Accessories" (Section
7)
of
the instrument's Operators
manual or the Accessories information
at
the rear of this
manual. Your Tektronix representative or local Tektronix
Field
Office
can
also provide accessories information
and
ordering assistance.
PERFORMANCE CONDITIONS
The
following electrical characteristics (Tables
1-1
through 1-5)
are
valid
for the instrument
when
it
has
been
adjusted at
an
ambient temperature between
+20°c
and
+30°C,
has
had
a warm-up period of at least 20 minutes,
and
is
operating at
an
ambient temperature between
-15°C
and
+55°C
(unless otherwise noted).
Items listed
in
the "Performance Requirements" column
define
the
measurement capabilities of the instruments.
Supplementary measurement conditions
may
also
be
listed
in
the "Performance Requirements" column.
Mechanical characteristics
are
listed
in
Table 1-6.
Environmental characteristics are given
in
Table
1-7.
The
oscilloscope meets the environmental requirements of
MIL-T-28800C for Type
111,
Class
3,
Style C equipment,
with the humidity
and
temperature requirements defined in
paragraphs 3.9.2.2, 3.9.2.3,
and
3.9.2.4.
1-1
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