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OPERATOR'S CHECKS AND ADJUSTMENTS
To
verify
the
operation and accuracy
of
your
instrument,
perform
the
following checks and adjustments before making a
measurement.
If
adjustments are required
beyond
the
scope
of
these
operator's
checks and adjustments, refer
to
a qualified
service technician
for
instrument
calibration.
@
TRACE ROTATION ADJUSTMENT
1. Preset instrument controls and
obtain
a Normal
Sweep Display (refer
to
Basic Oscilloscope Displays
section
of
this manual).
2.
Set
the
CH
1 AC-GND-DC switch
to
GND
to
display
a free-running trace with
no
vertical deflection.
NOTE
Normally, the resulting trace will
be
paral/al with the
center horizontal graticule line
and
should
not
require
adjustment.
3.
If
the
resulting trace
is
not
parallel with
the
center
horizontal graticule line,
rotate
the
TRACE ROTA·
TION
adjustment
screw, located just below
the
crt
graticule (see Figure
3),
to
align
the
trace with
the
center
horizontal graticule line.
BASIC 4658 TIMING CHECK
1. Preset
instrument
controls
and
obtain
a Normal
Sweep Display (refer
to
Basic Oscilloscope Displays
section in this manual) using
the
"'='1
kHz CALIBRA·
TOR square-wave
output
as
the
input
signal (see
following NOTE).
465B/DM44
Operators
37
l
:
'
r
1
·.·.
"
I
1
·.
'
~·
I
1
·.·
.
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