HP Cable Box 8591C manual FFT OFF FFT Stop Freq, Fine Tibg DAC

Spectrum Analyzer Mode Key Descriptions

Spectrum Analyzer Mode Functions

FFT OFF

FFT STOP FREQ

exits the FFT mode and menus, returning the analyzer to normal operation.

Front-Panel Key Access (-1

allows the user to enter the stop frequency for the desired FFT span. This sets the analyzer sweep time by the relationship:

FFT stop freq = 400 / (sweep time x 2)

N O T E

When using the FFT stop frequency function, the knob and step key increments are not optimal for positioning the signal. To use the knob or step keys to position the signal, select sweep time as the active function.

FINE TIBG DAC

Front-Panel Key Access (jjj

displays the output of the YTO fine-tune DAC, which is produced on the A7 Analog Interface assembly. This is a service diagnostic function and is for service use only.

Front-Panel Key Access ICAL)

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