Agilent Technologies HP 70910A Podręcznik Użytkownika Pobierz pdf (Strona 111)

Chapter 4 111

Performance Tests

1. Conversion Loss

Performance Tests

15.Set the spectrum analyzer controls as follows:

SHIFT, 5, MHz, 0, and dB (sets external mixer conversion loss to 0 dB)

FREQUENCY SPAN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 MHz

ENTER dB/DIV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 dB

CF STEP SIZE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 MHz

16.Set the reference level of the spectrum analyzer by pressing

REFERENCE LEVEL and

entering the corresponding value for the appropriate band listed below:

for an 11974A:

−40 dBm

for an 11974Q:

−40 dBm

for an 11974U:

−40 dBm

for an 11974V:

−55 dBm

17.Set the center frequency of the spectrum analyzer by pressing

CENTER FREQUENCY and

entering the corresponding value for the appropriate band listed below:

for an 11974A: 26.5 GHz

for an 11974Q: 33 GHz

for an 11974U: 40 GHz

for an 11974V: 50 GHz

18.On the spectrum analyzer, press MARKER

PEAK SEARCH and PRESEL PEAK.

19.Record the following values in Table 4-7 on page 140.

Marker Frequency

Marker Amplitude

Power Meter Reading

Cal Factor % or Correction Factor (dB)

Directional Coupler Coupling Factor

NOTE For the purpose of this measurement, the directional coupler coupling factor

is defined as the ratio of the power at the output flange to the power at the

coupled flange.

1 2 ... 106 107 108 109 110 111 112 113 114 115 116 ... 153 154

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Agilent Technologies HP 70910A Podręcznik Użytkownika Strona 111