:SPRocess:SINC:PNOise

Instrument:
N1010A
DCA-X
DCA-M
Meas. mode:
Scope
Eye
Jitter
Flex Apps:
FlexDCA
FlexRT
Sin(x)/x Commands

Command Syntax

:SPRocessN:SINC:PNOise {NONE | PRMS | SPECtrum}

Where N identifies one of up to 64 possible operators {1:64} that can be defined as part of a math function. The operators are numbered in the order that they were originally added to the function.

Query Syntax

:SPRocess:SINC:PNOise?

Description

Selects to preserve noise of a Sin(x)/x, or sinc(x), operator (:FUNCtion:FOPerator SINC). If a status message indicates that the output is questionable due to "The source waveform has not been acquired with enough samples per symbol to accurately represent noise", increase the samples-per-bit setting as explained for the :ACQuire:SPUI:MODE command.

Command arguments:

  • NONE. Noise handling is turned off.
  • PRMS. Applies preserve RMS noise handling where the noise magnitude is kept the same as the channel.
  • SPECtrum. Applies process spectrum noise handling where the function increases or decreases the noise based on whether SIRC is increasing or decreasing bandwidth. The noise power spectrum is assumed to match the channel response.
  • OFF. Deprecated with revision A.06.60. Replaced by new NONE argument.
  • ON. Deprecated with revision A.06.60. Replaced by new SPECtrum argument.

Turning preserve noise on compensates for the filter function's side effect of reducing a signals noise for adjacent measurement points. Preserving noise causes the operator to quantify the noise on each point on the operator's input waveform and restore this noise on the corresponding data point on the output waveform. Because this increases the fidelity of the waveform, it is recommended that preserve noise be used. An example of an advantage of using this feature is during Mask testing, as without preserving the noise the mask hits counts may be too low (optimistic).

By default, the bandwidth used when preserving the noise is automatically used. To manually set the bandwidth, use the :BANDwidth child command to enter the value and set the :BANDwidth:AUTO child command to OFF.

Requires FlexDCA revision A.05.60 and above.

Child Commands