
4.
6
dB
Resolution
Bandwidth
Selectivity
Tkst
Related
Adjustments
Specification
Description
Equipment
Note
Procedure
3 MHz Bandwidth Filter Adjustments
21.4 MHz Bandwidth Filter Adjustments
Step Gain and 18.4 MHz Local Oscillator Adjustments
60
dB/6
dB
bandwidth ratio:
<ll:l,
3 MHz to 100
kHz
bandwidths
<8: 1, 30
kHz
to 30 Hz bandwidths
60
dB
points on 10 Hz bandwidths are separated by
~100
Hz
Bandwidth selectivity is found by measuring the 60
dB
bandwidth
and dividing this value by the 6
dB
bandwidth for each resolution
bandwidth setting from 30 Hz to 3 MHz. The 60
dB
points for the 10
Hz bandwidth setting are also measured. The CAL OUTPUT provides
a stable signal for the measurements.
None required
Performance Test 3, 6
dB
Resolution Bandwidth Accuracy Test, must
be performed before starting this test.
1.
Press
(jYZZ@.
2. Connect CAL OUTPUT to RF INPUT.
3. Key in analyzer control settings as follows:
(CENTER FREQUENCY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 MHZ
FREQUENCY
SPAN)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 MHz
1-1
~.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.3
MHz
VIDEO BW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..lOOHz
SWEEP
@ZZ”
4. Press MARKER
C-1
and position marker at peak of signal
trace. Press MARKER
(ZJ
and position movable marker 60
dB
down from the stationary marker on the positive-going edge of
the signal trace (the MARKER
A
amplitude readout should be
-60.00
dB
fl.OO
dB).
It may be necessary to press SWEEP
[CONT)
and adjust (CENTER FREQUENCY) so that both 60
dB
points are
displayed. (See Figure 4-4.)
5. Press MARKER
[nl
and position movable marker 60
dB
down from
the signal peak on the negative-going edge of the signal trace (the
MARKER
A
amplitude readout should be .OO
dB
f0.50
dB).
6. Read the 60
dB
bandwidth for the 3 MHz resolution bandwidth
setting from the MARKER
A
frequency readout (Figure 4-4) and
record the value in
‘Ihble
4-4.
4-10
Option 462
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