HP Cable Box 8591C manual Ntsc

Spectrum Analyzer Mode Key Descriptions

Spectrum Analyzer Mode Functions

NTSC

OCC BW % POWER

OCCUPIED BANDWDTH

allows you to trigger on the NTSC video format. Pressing NTSC alters the TV line number that the analyzer triggers

on internally; the line number displayed when TV LINE #

is pressed does not change. Pressing NTSC changes the

video modulation to negative; set TV SYNC NEG POS so that POS is underlined if positive video modulation is required.

Front-Panel Key Access [TRIG)

allows the user to enter the percent of the power desired when using the occupied bandwidth measurement under the Pcrwer Menu softkey. When the power measurements are Erst accessed the initial value for percent power is 99 percent. Once the value is changed, the new value will be saved through an instrument preset or power-on. If the occupied bandwidth measurement is active and the percent power is changed, another sweep is taken and measured.

Front-Panel Key Access C-1

integrates the power of the displayed and puts markers at the frequencies containing a selected percent of the power. The measurement defaults to 99% of the occupied bandwidth power. The power-bandwidth routine Erst computes the combined power of all signal responses contained in the trace. For 99% occupied power bandwidth, it then puts markers at the frequencies at which 0.5% of the power lies to the right of the right marker and to the left of the left marker. Thus 99% of the power lies between the markers. The difference of the marker frequencies is the 99% power bandwidth and is the value displayed.

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