Agilent Technologies HP 70910A Podręcznik Użytkownika Pobierz pdf (Strona 94)

94 Chapter 3

Operation

Using 8561A/62A/62B Spectrum Analyzers

Operation

Sweep Time Considerations

For optimum amplitude accuracy, the sweep rate must be less than 40 MHz/ms, according

to the table below.

General Description of 8561A/62A/62B External-Mixing Functions

Table 3-8. Minimum Sweep Time

Frequency Span (GHz) Minimum Sweep Time (ms)

25 625

20 500

17 425

15 375

13.5 338

10 250

5 125

< 2 50

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

These bands are shown in Table 3-9. on page 95. 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.

CNV LOSS VS FREQ

displays the stored conversion loss for a specific frequency in the

current band. This allows amplitude correction to be entered to

compensate for changes in conversion loss with frequency. To enter a

new value, use the data keys. To change the displayed frequency, use

the step keys. Any changes to the data also affect the mean

conversion loss stored under

AVERAGE CNV LOSS. Table 3-9. on

page 95 shows the number of flatness points for each band and the

default flatness values. To view the correction, connect a 310.7 MHz

signal of a known amplitude (approximately

−30 dBm) to the IF

input and set the analyzer to sweep the associated band.

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 153 154

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