HP 8712C, Руководство пользователя, Страница: 432 / 559

I
Reference
nil
in marker functions menu. adjusts the electrical delay to balance
the phase of the DUT. This is performed automatically, regardless of the
format and the measurement being made. Enough line length is added to or
subtracted from the receiver input to compensate for the phase slope at the
active marker position. This effectively flattens the phase trace around the
active marker, and can be used to measure electrical length or deviation from
linear phase. Additional electrical delay adjustments are required on
without constant group delay over the measured frequency span. Since this
feature adds phase to a variation in phase versus frequency, it is applicable
only for inputs.
Access Keys: Functions
in marker functions menu. Makes reference level of graticule equal to
marker value; does not change reference
position.
If markers are off, it first
turns on marker at its previous setting or the center frequency (default).
Access Keys:
in menu. Invokes menu to select delta marker mode,
marker to center, marker to reference, marker to electrical delay, and marker
math functions.
in marker functions menu. Brings up menu to select statistics,
Math
flatness, and RF statistics calculations on user-dehned trace segments.
See , RF , and in this chapter.
in menu. Displays marker search menu to perform various
marker search functions.
See “Using Markers” in Chapter 4 for more information.
9-47