HP HP 8712ET, User Manual, Page: 144 / 480

4-26 ET User’s Guide
Using Instrument Functions
Using Markers
To Use Other Marker Functions
To Use Marker to
Center Frequency The marker to center frequency function changes the analyzer's center
frequency to that of the active marker and limits the span if necessary. If
the markers are all off, and this function is selected, it first turns on
marker 1 at its previous setting or, if no previous setting, at the center
frequency (default).
1. Press and then use the front panel knob or the numeric
keypad to move the marker to 200 MHz.
2. Press and note that the
trace has now shifted and that the center frequency of the analyzer is
now 200 MHz.
To Use Marker to
Reference The marker to reference function changes the value of the analyzer's
reference level to the amplitude value of the active marker. This function
does not change the reference position. If the markers are all off, and this
function is selected, it first turns on marker 1 at its previous setting or, if
no previous setting, at the center frequency (default).
1. Press and then use the front panel knob or the numeric
keypad to move the marker to about
−
10 dB.
2. Press and note that
the trace has now shifted up and that the marker is exactly on the
reference level.
To Use Marker to
Electrical Delay The marker to electrical delay function allows you to mathematically
subtract or add enough line length to the receiver input to compensate
for the phase slope at the active marker position. This effectively flattens
the phase trace around the active marker. You can use this to measure
the electrical length or deviation from linear phase. To access this
marker function, press
.
See in Chapter 8, “Hardkey/Softkey Reference,” for
more information.
See “Compensating for Phase Shift in Measurement Setups” on
page 5-17 for more information on electrical delay.
MARKER
Marker Functions Marker
−
> Center
MARKER
Marker Functions Marker
−
> Reference
Marker Functions Marker
−
> Elec Delay
Electrical Delay