Tektronix TDS724A
  USED  

The Tektronix TDS724A oscilloscope is a graph-displaying device ?
it draws a graph of an electrical signal.
In most applications, the graph shows how signals change over time:
the vertical (Y) axis represents voltage and the horizontal (X) axis represents time.
The intensity or brightness of the display is sometimes called the Z axis.

The Tektronix TDS724A oscilloscope's simple graph can tell you many things
about a signal, such as:
the time and voltage values of a signal, the frequency of an oscillating signal,
the ?moving parts? of a circuit represented by the signal,
the frequency with which a particular portion of the signal is occurring relative to,
other portions, whether or not a malfunctioning component is distorting the signal,
how much of a signal is direct current (DC) or alternating current (AC) and
how much of the signal is noise and whether the noise is changing with time.