Atek HP 8753D, Руководство пользователя, Страница: 275 / 677

Entry Block K eys
The entry block, illustrated in Figure 6-4, includes the numeric and units keypad, the knob ,
and the step keys . Y ou can use these in combination with other front panel keys and softkeys
for the following reasons:
to modify the active entry
to enter or change numeric data
to change the value of the active marker
Generally , the keypad, knob , and step keys can be used interchangeably .
Before you can modify a function, you must activate the particular function by pressing the
corresponding front panel key or softkey . Then you can modify the value directly with the
knob , the step keys , or the digits keys and a terminator .
If no other functions are activated, the knob moves the active marker .
Figure 6-4. Entry Block
Units T erminator
The units terminator keys are the four keys in the right column of the keypad. Y ou must
use these keys to specify units of numerical entries from the keypad. A numerical entry is
incomplete until a terminator is supplied. The analyzer indicates that an input is incomplete
by a data entry arrow pointing at the last entered digit in the active entry area. When you
press the units terminator key , the arrow is replaced by the units you selected. The units are
abbreviated on the terminator keys as follows:
4 G/n 5 = Giga/nano (10
9
/ 10
09
)
4
M/
5 =
Mega/micro (10
6
/ 10
06
)
4 k/m 5 =
kilo/milli (10
3
/ 10
03
)
4 x1 5 = basic units: dB , dBm, degrees , seconds , Hz, or dB/GHz (may be used to terminate
unitless entries such as averaging factor)
Application and Operation Concepts 6-9