The graph continuously updates as each frequency is measured. This forms a wavy measurement line (trace) across the entire frequency range. When excessive ingress noise occurs at a specific frequency, the measurement line develops a peak on the graph.

Limit Checking Results

When limit checking is enabled, black/white diagonal hash lines indicate the configured limit boundary (also described as the area "out of range"). When the noise peak overlaps the hash lines, the noise level at that frequency exceeds the acceptable range. This will initiate a Fail symbol at the top of the screen. If measurements (including peaks) at all frequencies appear below the hash lines, a Pass symbol will appear at the top of the screen.

NOTE:
No hash lines or Pass/Fail information is available when limit checking is turned off.

Viewing Options

Several viewing options are available to assist you with data assessment. Press the VIEW softkey. Use the arrow keys to choose the menu item you prefer and press ENTER to make your selection.

- Select Auto Reference to automatically view measurement results in the best reference setting on the graph (Keystroke shortcut: SHIFT 9). NOTE: For best reference setting results you may have to select the Auto Reference button more than once (up to three times).

- Select 5 dB/div or 10 dB/div to adjust the vertical resolution of the graph for the best viewing.

- Select (or deselect) Zoom to turn on and off graph magnification. When selected, the Zoom feature produces a 10MHz span.

- Select (or deselect) Peak Hold to turn on and off the Peak Hold function, which persists the highest level trace at each frequency for an extended view of the noise isolation.

- Select (or deselect) Reset to manually reset the Peak Hold function.

- Select Field View to display the Field View measurement mode.

- Select Pause to suspend measurement updates (Keystroke shortcut: SHIFT 8). Use the arrow keys to choose the menu item you prefer and press ENTER to make your selection.