4-44 ES User’s Guide
Using Instrument Functions
Using Reference Tracking
To Track a Frequency
1. If you want to move the reference position (indicated by the symbol
on the left side of the display), press
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.
2. Press .
Use the front panel knob, the keys, or the numeric
keypad to enter the frequency of interest.
3. Press . 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
. 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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