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Function Reference
Marker Setup
often causes pit searches to identify noise spikes. To avoid this misidentification, use video aver-
aging or video filtering to reduce the noise floor variance to a value less than the pit excursion
definition.
Use Marker Search Threshold
This limits the marker search function to data points above the selected threshold level. When
Marker Search Threshold is
Marker Search Threshold Value
Selects the amplitude threshold value used for limiting the marker search function.
Noise Marker Reference Bandwidth
Sets the normalization bandwidth for the noise and OSNR marker. There are two allowable set-
tings: 1 nm and 0.1 nm.
Peak Search at End of Each Sweep
Finds the peak value of the trace and moves the active marker to the peak at the end of each
sweep. This function operates on the normal, delta, bandwidth, noise markers, and OSNR.
OSNR Noise
Determines how the noise markers are to be calculated, Pit, Auto, or Manual. The default is Auto
mode.
• Pit: Uses the pit excursion criteria to find the closest pits from the center marker. Noise markers
• Auto: Uses a fixed offset, coupled with the resolution bandwidth, from the center marker.
RBW/2 +5nm
• Manual: Uses a user specified fix offset from the center marker. The default value is 0.4 nm
Key Path
3-38
ON
Note
Changing this value will change the value of the noise marker by 10 dB.
will be placed at the two pits.
and the step size is 0.2 nm when using the step keys. This field is inactive when set to Auto or
Pit.
Markers > Marker Setup
, a dotted line is shown on the display at the threshold level.
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