HP Cable Box 8591C manual 152

Spectrum Analyzer Mode Key Descriptions

Spectrum Analyzer Mode Functions

VID BW AUTO MAN

changes the analyzer post-detection filter from 30 Hz to 3 MHz in a 1, 3, 10 sequence. Rx” Option 130 only. Option 130 provides additional narrow resolution bandwidths of 30 Hz, 100 Hz, and 300 Hz.

As the video bandwidth is decreased, the sweep time is increased to maintain amplitude calibration. A “f” mark appears next to VBW on the bottom of the analyzer display to indicate that it is not coupled. To couple the video bandwidth, press VID BW AUTO MAN so that AUTO is underlined.

The video bandwidth can be changed by using the step keys, the knob, or the numeric keypad.

N O T E

Coupling the video bandwidth function also couples the video bandwidth to resolution bandwidth ratio function. If you want to auto-couple the video bandwidth to a nonstandard ratio, you must set the video bandwidth to auto-couple before setting the video-bandwidth/resolution-bandwidth ratio.

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