... y agrego otro documento a los de Chico3001: http://en.wikipedia.org/wiki/Oscilloscope
del cual resalto el siguiente parrafo:
The signal to be measured is fed to one of the input connectors, which is usually a coaxial connector such as a BNC
or UHF type
. Binding posts
or banana plugs
may be used for lower frequencies. If the signal source has its own coaxial connector, then a simple coaxial cable
is used; otherwise, a specialised cable called a "scope probe
", supplied with the oscilloscope, is used. In general, for routine use, an open wire test lead for connecting to the point being observed is not satisfactory, and a probe is generally necessary. General-purpose oscilloscopes have a standardised input resistance of 1 megohm in parallel with a capacitance of around 20 picofarads
. This allows the use of standard oscilloscope probes. Scopes for use with very high frequencies may have 50-ohm inputs, which must be either connected directly to a 50-ohm signal source or used with Z0 or active probes.
Less-frequently-used inputs include one (or two) for triggering the sweep, horizontal deflection for X-Y mode displays, and trace brightening/darkening, sometimes called "Z-axis" inputs."
Tienes el datasheet (enlace) del osciloscopio ?