Tektronix 2246 User Manual

: í Las Dapereorned
Section 4—2246 Operators
OPERATING
INFORMATION
GRATICULE
The
graticule
is
internally
marked
on
the
faceplate
of
the
crt
to
eliminate
parallax-viewing
error
and
to
enable
accurate
measurements
(see
Figure
4-1).
The
graticule
is
marked
with
eight
vertical
and
ten
horizontal
major
divi-
sions.
Major
divisions
are
further
divided
into
five
subdivi-
sions
of
0.2
division
each,
marked
along
the
center
vertical
and
horizontal
graticule
lines.
Percentage
marks
for
rise-
time
and
fall-time
measurements
are
located
on
the
left
side
of
the
graticule.
The
vertical
deflection
factors
and
herizontal
timing
are
calibrated
to
the
graticule
so
that
accurate
measurements
may
be
made
directly
from
the
ert.
The
waveform
displays
are
calibrated
to
the
crt
grati-
cule
markings
for
making
quick
and
very
accurate
esti-
1ST OR LEFT
VERTICAL
GRATICULE
11TH OR RIGHT
VERTICAL
GRATICULE
>X
CENTER
HORIZONTAL
GRATICULE
LINE
RISE AND
FALL TIME
MEASUREMENT
PERCENTAGE
MARKERS
CENTER
VERTICAL
GRATICULE
LINE
4207-03
Figure
4-1.
Graticule
measurement
markings.
TEE Cae NIC SEART STE DA STEE ERA LS GBR TREY age SEO SB WN EN SE ae
mates
of
waveform
parameters.
Voltage
measurements
are
done
by
counting
the
vertical
graticule
divisions
and
partial
divisions
occupied
by
the
portion
of
the
display
being
measured
and
then
multiplying
by
the
VOLTS/DIV
setting.
Time
measurements
using
the
graticule
markings
are
done
in
a
similar
manner.
Count
the
number
of
hor-
izontal
graticule
divisions
and
partial
divisions
occupied
by
the
portion
of
the
waveform
being
measured
and
multiply
by
the
SEC/DIV
setting.
To
improve
the
accuracy
of
the
estimate,
position
the
display
to
take
advantage
of
the
0.2
division
minor
grati-
cule
markings
on
the
center
graticule
lines.
Also
position
one
of
the
measurement
points
of
the
waveform
as
pre-
cisely
as
possible
on
one
of
the
major
graticule
marks
to
be
used
as
a
measurement
reference
point.
CRT READOUTS
The
ert
readout
display
is
the
user's
guide
to
how
the
instrument
controls
are
set
up.
No
physical
markings
are
on
the
rotating
switches
and
contro!
knobs
to
indicate
the
control
setting.
A
key
to
the
location
and
type
of
readout
information
displayed
is
illustrated
in
Figure
4-2.
GROUNDING
The
most
reliable
signal
measurements
are
made
when
the
2246
and
the
unit
under
test
are
connected
by
a
com-
mon
reference
(ground
lead)
in
addition
to
the
single
lead
or
probe.
The
ground
lead
of
the
probe
provides
the
best
grounding
method
for
signal
interconnection
and
ensures
the
maximum
amount
of
signal-lead
shielding
in
the
probe
cable.
A
separate
ground
lead
can
also
be
connected
from
the
unit
under
test
to
the
oscilloscope
ground
jack
on
the
front
panel
using
a
banana-tip
connector.
SIGNAL
CONNECTIONS
Probes
Generally,
probes
offer
the
most
convenient
means
of
connecting
an
input
signal
to
the
instrument
and
are
Shielded
to
prevent
pickup
of
electromagnetic
interference.
4-1

Tektronix 2246 Specifications

General

Brand	Tektronix
Model	2246
Category	Test Equipment
Language	English