HP 8566B Adjustment Manual page 369

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 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
FREQUENCY SPAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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
-60.00 dB fl.OO dB). It may be necessary to press SWEEP [CONT)
(
and adjust
CENTER FREQUENCY
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
A
MARKER amplitude readout should be .OO dB f0.50 dB).
6. Read the 60 dB bandwidth for
setting from the MARKER
record the value in 'Ihble 4-4.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
)
A
amplitude readout should be
)
so that both 60 dB points are
the 3 MHz resolution bandwidth
A
frequency readout (Figure 4-4) and
MHZ
20 MHz