94
Chapter 3
Operation
Using 8561A/62A/62B Spectrum Analyzers
O
p
er
ati
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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
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
.
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.
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Страница 8: ...7 General Information 1 General Information ...
Страница 28: ...27 Installation 2 Installation ...
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Страница 48: ...47 Operation 3 Operation ...
Страница 57: ...56 Chapter3 Operation Operating Hints Operation Figure 3 4 Setup Configuration for Remote Location of an 11974 ...
Страница 97: ...96 Chapter3 Operation Using 8561A 62A 62B Spectrum Analyzers Operation ...
Страница 98: ...97 Performance Tests 4 Performance Tests ...
Страница 107: ...106 Chapter4 Performance Tests Performance Test Procedures Performance Tests Figure 4 1 Performance Tests Setup ...
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