HP 8568B Manual do Utilizador Página 38

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5. Resolution Bandwidth Selectivity Test
6. Read the 60
dB
bandwidth for the 3 MHz resolution bandwidth
setting from the MARKER A frequency readout (see Figure 2-7)
and record the value in
Table
2-9.
7. Vary spectrum analyzer settings according to Table 2-9. Measure
the 60
dB
bandwidth for each resolution bandwidth setting by the
procedure of steps 4 through 6 and record the value in
‘fable
2-9.
8. Record the 3
dB
bandwidths from
Table
2-8 in
Table
2-9.
9. Calculate the bandwidth selectivity for each setting by dividing
the 60
dB
bandwidth by the 3
dB
bandwidth. The bandwidth
ratios should be less than the maximum values shown in
‘fable
2-9.
10. The 60
dB
bandwidth for the 10 Hz resolution bandwidth setting
should be less than 100 Hz.
Figure 2-7. 60
dB
Bandwidth Measurement
2-16 Performance Tests
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