Agilent Technologies HP 70910A Podręcznik Użytkownika Pobierz pdf (Strona 76)

76 Chapter 3

Operation

Using 8563A, 8561B, 8560A, or 8560 E/EC-Series Spectrum Analyzers

Operation

General Description of External-Mixing Functions

NOTE There are two different types of external mixers available, preselected and

unpreselected. The

EXT MXR PRE UNPR softkey function applies only to the

selection of the type of external mixer to be used. It does not switch the

analyzer from internal to external mixing.

NOTE No external mixing capabilities are available with an 8560A/E Option 002.

Resolution bandwidths less than or equal to 100 Hz are not available with

external mixers.

CONFIG,

EXT MXR PRE UNPR

selects either preselected external mixing mode or unpreselected

external mixing mode. This softkey sets the external mixer

configuration used by the softkey menu found under the

EXTERNAL MIXER softkey under AUX CTRL.

If the preselected external mixer mode is selected, rear-panel output

J8 of the analyzer is automatically switched to provide an output of

1.5 V/GHz of the LO frequency, when 0.5V/GHz (FAV) is selected.

The 1.5 V/GHz of the LO frequency definition is required for the

11974 Series preselected external mixers.

EXTERNAL MIXER

accesses a menu of functions that allow you to extend the frequency

range using external mixers. These functions are described below.

FULL BAND

allows you to select a commonly-used frequency band above 18 GHz.

These bands are shown in Table 3-3. on page 77. Use the step keys or

the knob to select a desired frequency band; the selected band

appears in the active function block. Activating

FULL BAND also

activates the harmonic-lock function.

AMPTD CORRECT

displays a menu of functions that set conversion losses and flatness

data.

AVERAGE CNV LOSS

displays the mean conversion loss for the current harmonic and

allows you to enter new conversion loss data. In a full frequency band

(such as A band), the mean conversion loss is defined as the

minimum loss plus the maximum loss for that band divided by two.

To change the maximum and minimum values, use the

CNV LOSS VS FREQ softkey. Any change to the average conversion

loss also affects the flatness data, which is described below.

The default conversion loss value for each band is 30 dB.

1 2 ... 71 72 73 74 75 76 77 78 79 80 81 ... 153 154

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