HP 8591C Manuale Utente Scaricare il pdf (Pagina 134)

100

101

Using Spectrum Analyzer Features

Using limit-line Functions

l The upper and lower limit-line table format is accessed by Edit Up/Low

With the upper and lower limit-line table format, the upper and lower

limit-line coordinates can be entered at the same time: the frequency

(or time), upper amplitude, lower amplitude, and type are specified. The

frequency (or time) and upper amplitude comprise the coordinate point for

the upper limit line; the frequency (or time) and lower amplitude value

comprise the coordinate point for the lower limit line. It is not necessary to

specify both an upper- and lower-amplitude component for every frequency

component. Three asterisks in the table indicate that an amplitude value

has not been entered for the segment.

l The mid/delta limit-line table format is accessed by Edit

Mid/D&t

. Like

the upper and lower limit-line table format, the mid/delta limit-line table

format provides a means of specifying the upper and lower limit lines at

the same time. Unlike the upper and lower table format, the amplitude

values are specified as a middle amplitude value with a delta: the upper

and lower limit lines are then drawn at an equal positive and negative

distance from the middle amplitude. With the mid/delta format, the

frequency (or time) and the mid-amplitude plus the delta comprise the

upper limit line; the frequency (or time) and the mid-amplitude minus the

delta comprise the lower limit line. The difference between the mid/delta

format and the upper/lower format is the way the amplitude values are

entered; however, in both formats, the frequency coordinate begins a

segment. The mid/delta format can be used if the upper and lower limit

lines are symmetrical with respect to the amplitude axis.

NOTE

Editing a limit line table can be done using a different format than the one that was used for creating

it.

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HP 8591C Manuale Utente Pagina 134

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