HP Cable Box 8591C manual DB PTS on OFF, Edit

N dB PTS ON OFF

N E W

EDIT

Spectrum Analyzer Mode Key Descriptions

Spectrum Analyzer Mode Functions

automatically places two markers at points N dB from the highest point on the highest displayed signal, and determines the frequency difference between the two markers. N dB is the active function and the value of N is set by the user. The measurement defaults to 3 dB when it is first turned on. The measurement runs continuously re-executing at the end of each sweep.

No other signal can appear on the display within N dB of the highest signal. The measured signal cannot have more than one peak that is greater than or equal to N dB. A signal must be greater than the peak excursion above the threshold to be identified. The setting for peak excursion may be increased from the 6 dB default value so that noise will not be identified as signals. Increasing the value too much may cause a smaller signal to be missed or misinterpreted as part of a larger signal. The amplitude scale may be either linear or logarithmic.

Front-Panel Key Access (jj)

Refer to the HP 8590 E-Series and L-Series Spectrum

Analyzers and HP 8591C Cable TV Analyzer Programmer’s Guide for more information.

starts the DLP editor function, clearing the DLP editor memory to create a new item in the analyzer 2500 byte DLP editor memory. The item will not be in the analyzer user memory until it is processed by the SAVE EDIT softkey. The DLP editor memory buffer remains intact when the instrument is preset and when it is powered off.

Front-Panel Key Access [RECALL) or ISAVE_)

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