Agilent Technologies HP 70910A Uživatelská příručka stáhnout pdf (Strana 128)

128 Chapter 4

Performance Tests

4. Displayed Average Noise Level

Performance Tests

14.Record the following in Table 4-10 on page 146.

Center Frequency

Displayed Average Noise Level (Marker Amplitude)

15.On the spectrum analyzer, press

SHIFT and SWEEP TIME to turn off the video average

function.

16.On the spectrum analyzer, press

CENTER FREQUENCY and enter the corresponding

value for the band listed below:

for an 11974A: 40 GHz

for an 11974Q: 50 GHz

for an 11974U: 60 GHz

for an 11974V: 75 GHz

17.Set the conversion loss to the value recorded for this frequency in Table 4-7 on page 140.

Press

SHIFT, 5, and MHz, then enter the conversion loss value from Table 4-7 on

page 140. Press

dB to terminate the entry. Record this value in Table 4-10 on page 146.

18.On the spectrum analyzer, press

SHIFT, VIDEO BW, 10, and Hz to activate the video

average function to average 10 traces.

19.After the video average counter reaches 10, press MARKER

NORMAL and

PEAK SEARCH. The marker amplitude is the displayed average noise level.

20.Record the following in Table 4-10 on page 146.

Center Frequency

Displayed Average Noise Level (Marker Amplitude)

21.On the spectrum analyzer, press

SHIFT SWEEP TIME to turn off the video average

function.

22.On the spectrum analyzer, press

CENTER FREQUENCY and enter the frequency

corresponding to the maximum conversion loss measured in Table 4-7 on page 140.

23.Set the conversion loss to the value recorded for this frequency in Table 4-7 on page 140.

Press

SHIFT 5 MHz, then enter the conversion loss value from Table 4-7 on page 140.

Press

dB to terminate the entry. Record this value in Table 4-10 on page 146.

24.On the spectrum analyzer, press

SHIFT, VIDEO BW, 10, and Hz to activate the video

average function to average 10 traces.

25.After the video average counter reaches 10, press MARKER

NORMAL and

PEAK SEARCH. The marker amplitude is the displayed average noise level.

26.Record the following in Table 4-10 on page 146.

Center Frequency

Displayed Average Noise Level (Marker Amplitude)

1 2 ... 123 124 125 126 127 128 129 130 131 132 133 ... 153 154

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