Marker Search

Marker search functions move the active marker to points of interest on the trace — peaks, valleys, or adjacent features — without manual positioning.

Find the maximum value

1. Select the marker you want to use.
2. Tap MARKER → SEARCH → MAXIMUM.
3. The marker jumps to the highest point on the active trace.

This is useful for finding the peak response of a bandpass filter or the resonant frequency of an antenna.

Find the minimum value

1. Select the marker you want to use.
2. Tap MARKER → SEARCH → MINIMUM.
3. The marker jumps to the lowest point on the active trace.

This works well for locating the deepest return loss notch or the stopband null of a filter.

Search left or right

To find the next peak or valley relative to the current marker position:

• SEARCH <LEFT — searches toward lower frequencies from the marker
• SEARCH >RIGHT — searches toward higher frequencies from the marker

These are useful for stepping through multiple resonances or ripple peaks across a frequency span.

Enable tracking mode

1. Select the marker.
2. Tap MARKER → SEARCH → TRACKING.
3. The marker now automatically follows the peak (or valley) on every sweep.

With tracking enabled, the marker continuously updates its position as the trace changes. This is particularly helpful when adjusting an antenna or tuning circuit in real time — the marker stays locked to the feature you care about.

Note

Tracking follows whichever extreme (maximum or minimum) was last selected. If you used MAXIMUM before enabling TRACKING, it tracks the peak. If you used MINIMUM, it tracks the valley.

Tip

Combine tracking with a narrow frequency span for detailed real-time monitoring of a single resonance while making physical adjustments to your device under test.