ADJUSTMENTS AND MEASUREMENTS
This section provides the procedures
and
information
you
will
need
to
make precision measurements
with
the
4658
and
the DM44
(if
your
instrument
is
equipped
with
this option).
It
is
divided
into
three subsections. The
first
contains
basic
operating information
and
techniques
that
should
be
considered before attempting any measurements.
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.
OPERATING CONSIDERATIONS
GRATICULE
The graticule
is
internally marked on the faceplate
of
the
crt
to
provide accurate measurements
without
parallax.
It
is
marked
with
eight vertical and ten horizontal major
divisions. In addition,
each
major 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.
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
465B/DM44 Operators
@
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