HP 8566B Adjustment Manual page 39

2-14 Performance Tests
(For instruments with Option 462, refer to Chapter 4.)
3 MHz Bandwidth Filter Adjustments
21.4 MHz Bandwidth Filter Adjustments
Step Gain and 18.4 MHz Local Oscillator Adjustments
60 dB/3 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 3 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, RESOLUTION BANDWIDTH ACCURACY TEST,
must be performed before starting this test.
1. Press @7ZiZj.
2. Connect CAL OUTPUT to RF INPUT.
3. Key in analyzer control settings as follows:
FREQUENCY SPAN) . . . . . . . . . . . . . . . . . . . . . . . . .
VIDEO BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SWEEP @Z%j
4. Press MARKER (j-j 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 f 1.00 dB). It may be necessary to press SWEEP
(
CENTER FREQUENCY
are displayed. (See Figure 2-6.)
5. Press MARKER In] 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 2-6) and
record the value in Table 2-6.
100 MHz
. 3 MHz
. . 100 Hz
)
so that both 60 dB points