Operation
Model 182C
3-43.
To measure phase, set the internal PHASE/
BANDWIDTH switch to PHASE and connect the input
si
9
nal$
to
the vertical amplifier Channel
A input and the
oscilloscope
HORIZONTAL EXT
INPUT.
Set the HORI-
ZONTAL
DISPLAY
to
EXT.
A display
similar
to Figure
3-2
will be observed. The size of the opening of the display
Is a relative indication of the phase difference of the input
signals.
3-44.
To obtain a more exact measurement
of
the phase
difference, center the display in the X-axis and
Y-axis.
Increased
measurement accuracy will
be
obtained
by
using
horizontal and vertical deflection factors which result in
maximum display size. The phase shift in degrees is deter-
mined by the following;
.,/Lopening\
0
=
sin
-1
I
.
]
\
L
total
/
As an example, assume that
^
total is
8
divisions. If
L
opening is 1 division, the phase shift
is
approximately
7 degrees.
Note
Make certain that the switch is returned
to BANDWI DTH position after making
phase measurements.
This will allow
normal
operation.
345. PLUG-iN UNITS.
3-46.
The
Model 182C
Oscilloscope requires time
base
artd vertical or samplirtg plug-in units. The deflection
sensitivity of
the CRT may vary slightly with different
units.
Vertical
plug-ins should be calibrated when first
installed or when shifted between oscilloscopes.
The time
base ar>d
vertical
plug-ins must be locked together
prior to
insertion into
the Model 182C. Consult the respective
plug-in Operating arvj Service Manuals for
operation and
capability information,
Table
3-1
lists the plug-ins
cur-
rently available.
3-4
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