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4. Impulse and Resolution Bandwidth Selectivity
Figure 4-5. 60 dB Bandwidth Measurement
4.
Press MARKER [al and position the positive movable marker 60 dB
down from the signal peak on the negative-going edge of the signal
trace (the MARKER Ia] amplitude readout should be 0.00 dB f0.50
5.
Read the 60 dB bandwidth for the 3 MHz resolution bandwidth
setting from the MARKER m frequency readout (see Figure 4-5)
and record
the
value in 'fable 4-5.
6.
Select the spectrum analyzer
for each resolution bandwidth setting by the procedure of steps 3
through 5 and record the value in Table 4-5.
7.
Record the 6 dB bandwidths for each resolution bandwidth setting
from Table 4-l in Table 4-5.
8.
Calculate the bandwidth selectivity for each setting by dividing the
60 dB bandwidth by the 6 dB bandwidth. The bandwidth ratios
should be less than the maximum values shown in Table 4-5.
9.
The 60 dB bandwidth for the 10 Hz resolution bandwidth setting
should be less than 100 Hz.
and
FREQUENCY
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