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132 Chapter 4

Performance Tests

5. 3 dB Bandwidth

Performance Tests

14.Set the center frequency of the spectrum analyzer by pressing CENTER FREQUENCY and

entering the corresponding value for the band listed below:

for an 11974A: 26.5 GHz

for an 11974Q: 33 GHz

for an 11974U: 40 GHz

for an 11974V: 50 GHz

15.On the spectrum analyzer, press the following keys:

MARKER

NORMAL

PEAK SEARCH

PRESEL PEAK

16.When the preselector-peak routine is complete, press MARKER PEAK SEARCH and ∆.

17.On the spectrum analyzer, press

SHIFT and GHz to activate the preselector DAC

number.

18.On the spectrum analyzer, use the

⇓ key to reduce the DAC number by one step at a

time until the delta-marker amplitude is less than or equal to

−3.0 dB.

19.Record the Center Frequency and the preselector Low DAC number in Table 4-11 on

page 146.

20.On the spectrum analyzer, use the

⇑ key to tune to the other side of the filter by

increasing the DAC number until the delta marker amplitude goes back to 0. Continue

to increase the DAC number until the delta-marker amplitude is less than or equal to

−3.0 dB.

21.Record the preselector DAC number in Table 4-11 on page 146 under High DAC

Number.

1 2 ... 127 128 129 130 131 132 133 134 135 136 137 ... 153 154

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Agilent Technologies HP 70910A Guía de usuario Pagina 132