Db Resolution Bandwidth Selectivity Test - HP 8568B Performance Tests And Adjustments Manual

Spectrum analyzer
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5. 6 dB Resolution
Bandwidth
Selectivity Test
Related Adjustments
Specification
Description
Equipment
Note
Procedure
4-10 Option 462
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:
60 dB points on 10 Hz bandwidth are separated by ~100 Hz
Bandwidth selectivity is found by measuring the 60 dB bandwidth
and dividing this value by
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 4, 6 dB Resolution Bandwidth Accuracy Test, must
be performed before starting this test.
1. Press
2. Connect CAL OUTPUT to SIGNAL INPUT 2.
3. Key in analyzer control settings as follows:
[
C E N T E R
F R E Q U E N C Y
FREQUENCY SPAN]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 MHz
SWEEP @iiYZ-
4. Press MARKER C-1 and position marker at peak of signal
trace. Press MARKER @ 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 +l.OO dB). It may be necessary to press SWEEP (CONT)
and adjust
FREQUENCY
displayed. (See Figure 4-4.)
5. Press MARKER (7iJ and position movable marker 60 dB down from
the signal peak on the negative-going edge of
MARKER A amplitude readout should be .OO dB f0.50 dB).
the
6. Read
60 dB bandwidth for the 3 MHz resolution bandwidth
setting from the MARKER A frequency readout (Figure 4-4) and
record the value in 'Iable 4-4.
the
6 dB bandwidth for each resolution
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
so that both 60 dB points are
_)
20 MHz
the
signal trace (the

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