Technical data

4-16
Hardkey and Softkey Reference
LOWER LIMIT. sets the lower limit value for the start of the segment in a limit line list. If an upper limit is specified, a
lower limit must also be defined. If no lower limit is required for a particular measurement, force the lower limit value
out of range (for example −500 dB).
MANUAL TRG ON POINT. waits for a manual trigger for each point. Subsequent pressing of this softkey triggers each
measurement. The annotation “man” will appear at the left side of the display when the instrument is waiting for the
trigger to occur. This feature is useful in a test sequence when an external device or instrument requires changes at
each point.
Marker. 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 Marker 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.
MARKER → AMP. OFS. 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.
MARKER → CENTER. changes the stimulus center value to the stimulus value of the active marker, and centers the
new span about that value.
MARKER → CW. sets the CW frequency of the analyzer to the frequency of the active marker. This feature is useful
in automated compression measurements. Test sequences allow the instrument to automatically find a maximum or
minimum point on a response trace. The MARKER → CW command sets the instrument to the CW frequency of the
active marker. When power sweep in engaged, the CW frequency will already be selected.
MARKER → DELAY. 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 DUTs 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.
MARKER → MIDDLE. sets the midpoint for DELTA LIMITS using the active marker 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.
MARKER → REFERENCE. 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.
MARKER → SPAN. changes the start and stop values of the stimulus span to the values of the active marker and the
delta reference marker. If there is no reference marker, the message
"NO MARKER DELTA − SPAN NOT SET" is displayed.
MARKER → START. changes the stimulus start value to the stimulus value of the active marker.
MARKER → STIMULUS. sets the starting stimulus value of a limit line segment using the active marker. Move the
marker to the desired starting stimulus value before pressing this key, and the marker stimulus value is entered as the
segment start value.
MARKER → STOP. changes the stimulus stop value to the stimulus value of the active marker.
MARKER 1. turns on marker 1 and makes it the active marker. The active marker appears on the display as ∇. The
active marker stimulus value is displayed in the active entry area, together with the marker number. If there is a marker
turned on, and no other function is active, the stimulus value of the active marker can be controlled with the knob, the
step keys, or the numeric keypad. The marker response and stimulus values are displayed in the upper right-hand
corner of the screen.
MARKER 2. turns on marker 2 and makes it the active marker. If another marker is present, that marker becomes
inactive and is represented on the display as ∆.
MARKER 3. turns on marker 3 and makes it the active marker.
MARKER 4. turns on marker 4 and makes it the active marker.
MARKER 5. turns on marker 5 and makes it the active marker.