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Displaying Waveforms
3-60
CSA8000B & TDS8000B User Manual
Horizontal Units. You can specify the time values in seconds, bits or distance
from the Horizontal Setup dialog box. When you select Distance as the timebase
units, the timebase scale and position controls and the readouts use (appear with)
distance units. You can select from meters, feet, or inches as your distance unit.
The timing measurement results remain as seconds.
The dialog box also provides a Dielectric Const(ant) and Prop(agation) Velocity
controls with which you can select either the effective dielectric constant of the
device under test or its propagation velocity (they interact, so set one or the
other). Distance units and these other two controls are useful when doing TDR
measurements and testing. You may want to turn on distance units and set the
dielectric constant or propagation velocity when making such measurements.
The formula is:
D = v
◽
T
where:
v
◽
= propogation velocity, =
c
o
DielectricConst
Ꭹ
T =
time per division
D = distance per division
c
o
= speed of light in a vacuum, = 2.997925 e8 metersፒs
Velocity of Propagation (v
p
) is a measure of how fast a signal travels in that
transmission line.
DielectricConst is the relative effective dielectric constant of the propagation
media.
Mouse and Touchscreen Operation. This instrument ships with a mouse and
keyboard to give you more options for instrument control. However, for some
installations, you might not have sufficient work space to install the mouse or
keyboard. For most operations, you can use the touchscreen instead.
Table 3--4 lists some operations and the mouse/touchscreen equivalents. The
instrument ships with two styluses. Using a stylus can make it easier to perform
touchscreen operations.