Operation
Probe Handling
Both the probe and the probe accessories should
be
handled carefully
to
prevent damage. Striking a hard surface can damage both the probe body and
the probe tip. Exercise care to prevent the
cable from being crushed, kinked, or
excessively strained.
Coaxial Cables
To maintain good waveform fidelity and accuracy, only high-quality, low-loss
coaxial cables should
be
used. The instrument
is
optimized for 50 0 sources,
driving the 50
0 dc input through 50 0 cable. If you use another signal source
impedance, such as 75
0, use the appropriate coaxial cable and
an
external
terminator to match, with the input set at 1
MO.
Some high frequency response
will
be
lost with external termination.
Magnify Waveform Details
with
Delayed-Sweep
1.
Display a waveform with the A-Sweep, then pull SEC/DIV out to activate B-
Sweep and light both the A SWP and B SWP indicators (INTEN mode).
2.
If a B-Trigger Mode indicator
is
on, select
RUN
AFT DL
Y.
(If
an
A-Trigger
Mode indicator
is
on, the B-Trigger has been set previously
to
RUN
AFT DLY.)
3.
Set
~
REF
OR
DL Y POS
to
place the small intensified zone at a point of
interest. (This zone may be more apparent with a
lower Intensity setting.) If the
A-Sweep terminates just after the intensified zone, you can move the
HOLDOFF
control and set it at MIN. (Two intensified zones appear if you have
selected
~t
or
1/~t.
See "Delta-Delay-Time.")
4.
Turn SEC/DIV clockwise, with the knob pulled out, to expand the point of
interest on the B-Sweep,
while observing its relationship
to
everything else
on
the A-Sweep (AL T mode). Use TRACE SEP to separate the A-Sweep and
B-
Sweep traces.
5.
If you want
to
simplify the display and obtain the best possible view
of
the
magnified detailS, push the
SEC/DIV knob
in
to
display only the B-Sweep. If
you want the brightest trace
pOSSible,
set HOLDOFF to B ENDS
A,
which
makes the sweep repetition rate
as
high as possible.
6.
Select
~V,
~t,
or
1/~t
when the SEC/DIV knob
is
pushed
in
to
measure
waveform details with cursors. The
~
REF
and
~
controls have no effect on
sweep
delay while cursors are displayed.
2465A/2455A/2445A Operators
2-13
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