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
9.
dc input through 50
U
cable. If you use another signal source
impedance, such as 75 ft, use the appropriate coaxial cable and an external
terminator to match, with the input set at
1
MQ. 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 DLY. (If an A-Trigger
Mode indicator is on, the B Trigger has been set previously to RUN AFT DLY.)
3. Set A REF OR DLY 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 At or 1/At. 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 (ALT 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 AV, At, or 1/At when the SEC/DIV knob is pushed in to measure
waveform details with cursors. The A REF and A controls have no effect on
sweep delay while cursors are displayed.
2465B/2455B/2445B Operators
2-17
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