The processed echo display ( P-79 ) can be made to show not only the processed
echo profile, but also the:
• echo marker
• window
• TVT curve or auxiliary window
Typical scope settings for viewing the processed echo are:
• gain - 1 v / d
• sweep - 1 msec / div
The following are restricted to transmission in air at 20 °C.
• to obtain a time measurement of the processed echo, the sweep time must
be multiplied by a factor of 10
• to obtain a time measurement of the transmit or receive signal, use the
actual sweep setting
• to obtain a distance measurement of either of the above types of echoes,
divide the respective time measurement by 1.8 msec / ft or 5.9 msec / m
Typical Scope Display
Scope Display LCD display ( P-79 )
Window u
Marker n
Curve - TVT c
Profile P
TVT curve
window
( near blanking )
echo profile
echo marker
( far end blanking )
PL-443 8 – 2
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