HP 8711C, User Manual, Page: 151 / 530

Using Instrument Functions
Using Reference Tracking
1. If you want to move the reference position (indicated by the symbol on
the left side of the display), press Position and
then use the front panel knob, the keys, or the numeric keypad to
enter a new reference position. A number is assigned to each possible
reference position. See Figure 4-19.
Press Ref Set Frequency Use the
front panel knob, the keys, or the numeric keypad to enter the
frequency of interest.
Press Reference . The reference
level is now adjusted with each sweep so that the frequency of interest
falls on the reference line. Note that the y-axis is now a relative scale,
with all amplitude values referenced to the reference line. Also note that
a small arrow appears underneath the measurement trace at the point
where the frequency of interest intersects the reference line.
4. To turn reference tracking off, press Ref Tracking Off .
The y-axis reverts to its previous scale format, and the reference level is
readjusted so that the measurement trace is placed correctly on the display
for absolute measurements.
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