Specifications

ADJUSTMENTS
AND
MEASUREMENTS
This
.section
provides
the
procedures
and
information
you
will
need
to
make
precision
measurements
with the
4658 an.d
the
DM44
(if
your
instrument
is equipped
with
this
option).
lt
is
divided
into
three subsections.
The
first
contains
basic operating
information and techniques
that
should
be considered
before
attempting
any
measurements.
OPERATING
GRATICULE
The
graticule
is
internally
marked
on
the
faceplate of
the
crt to
provide
accurate
measurements
without
parallax.
lt is
marked
with
eight
vertical and
ten
horizontal
major
divisions.
ln addition,
each
maior division
is divided
into
five
minor divisions.
The
vertical deflection
and
horizontal
timing
are
calibrated
to
the
graticule
so
that accurate
mea'
surements
can
be
made directly
from the crt.
The second subsection
is comprised of a series
of operator's
checks
and adjustments
which, when
performed,
should
verify
instrument operation and
ensure optimum
measure-
ment accuracies. The
final
subsection
details the
procedures,
formulas,
and
examples
required to
make
the
various types
of
precision
measurements with
your
instrument.
CONSIDERATIONS
GROUNDING
The most reliable signal
measurements
are
made
when
the
4658
and
the
unit under test are connected together
by
a
common
reference
(ground)
lead in
addition to the
signal
lead or
probe.
The
ground
strap
on the
probe
provides
the
best
grounding
method. Also,
you
can connect a
ground
lead
from the
unit under
test to
the chassis
ground
banana
jack
located on the
lower left
portion
of the
instrument
front
panel.
@
34
4658/DM44
Operators