Specifications

OPERATOR'S CHECKS AND ADJUSTMENTS
To verify
the operation and accuracy
of
your
instrument,
perform
the
following
checks and adjustments before making a
measurement. lf adiustments
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
f ree-running
trace
with
no vertical
deflection.
NOTE
Normally, the resulting
trace will be
parallal
with the
center horizontal
graticule
line
and should
not require
adjustment.
3.
lf 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).
@
4658/DM44
Operators
37