&$ggQQ$ ,,.

j&#-p&

G && #F$,-

,....... .... ; :.. ...,,...

,.....,.,, ,.,.

&&&J$

displays an active marker on the screen and provides access to a series of menus to control from one to five display markers for each channel. Markers provide numerical readout of measured values at any point of the trace.

The menus accessed from the @K&F] key provide several basic marker operations. These include special marker modes for different display formats, and a marker delta mode that displays marker values relative to a specified value or another marker.

uses the active marker to set the amplitude offset for the limit lines. Move the marker to the desired middle value of the limits and press this softkey. The limits are then moved so that they are centered an equal amount above and below the marker at that stimulus value.

changes the stimulus center value to the stimulus value of the active marker, and centers the new span about that value.

sets the CW frequency of the analyzer to the frequency of the active marker. This feature is intended for use in automated compression measurements. Test sequences allow the instrument to automatically find a maximum or minimum

point on a response trace. The .3&K& 2: $3 command sets

,,,,......:

the instrument to the CW frequency of the active marker. When power sweep in engaged, the CW frequency will already be selected.

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 DU’I3 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 ratioed inputs.

sets the midpoint for L%&?l% ;LXl$i’@ using the active marker /.i . . ...” ....... .i

to set the middle amplitude value of a limit segment. Move the marker to the desired value or device specification, and press this key to make that value the midpoint of the delta limits. The limits are automatically set an equal amount above and below the marker.

makes the reference value equal to the active marker’s response value, without changing the reference position. In a polar or Smith chart format, the full scale value at the outer circle is changed to the active marker response value. This softkey also appears in the scale reference menu.

Key Definitions B-25

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Image 514
HP 8753E manual #F$