Specifications

The rising edge of the sawtooth sweeps the beam across the screen (this voltage is on the plates in the

CRT that deflect the electron beam horizontally). At the right edge of the CRT, the electron beam is

turned off and the voltage goes back to what it was at the left edge of the CRT. The holdoff period

(control 6 in Figure 5) allows this period to be adjusted. Increasing the holdoff time can make it easier to

get stable displays of complex waveforms.

Graticule

The oscilloscope's screen is covered with a Cartesian coordinate system called the graticule:

Figure 11

The graticule lets you make measurements of the signal's voltage (vertical axis) and timing (horizontal

axis). The percentage marks along the left edge are used to measure rise times. A waveform is

positioned so that its vertical extent lies exactly between the 0% and 100% marks. Then the horizontal

distance (i.e., time) is read between the 10% and 90% points, as this is a common definition of the rise

time of a signal.

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