Impulse And Resolution Bandwidth Selectivity Test - HP 8566B Adjustment Manual

4. Impulse and Resolution Bandwidth Selectivity Test

3 MHz Bandwidth Filter Adjustments
2 1.4 Bandwidth Filter Adjustments
Step Gain and 18.4 MHz Local Oscillator Adjustments
60 dB/6 dB bandwidth ratio:
1, 30 kHz to 30 Hz
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 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.
Resolution Bandwidth Accuracy Test must be performed before this
test.
None required
1. On the spectrum analyzer press C2-22) and connect the CAL
OUTPUT to RF INPUT.
2. Key in spectrum analyzer control settings as following:
[ ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CENTER FREQUENCY
FREQUENCY SPAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VIDEO BW
SWEEP . . . :: :::::: :: ::: :::: ::: ::::::: ::: :::::: .'.'.'.~.~.~.~.~.~.~.~ .'.'cm]
3. On the spectrum analyzer, press MARKER CNORMAL-] and position
the marker at the peak of the signal trace using the DATA knob.
Press MARKER In] and position the movable marker 60 dB down
from the stationary marker on
trace (the MARKER Ia] amplitude readout should be -60.00 dB
fl.OO dB). It may be necessary to press SWEEP ICONT) and to
adjust
(
CENTER FREQUENCY
(see Figure 4-5).
the positive going edge of the signal
so that both 60 dB points are displayed
)
100
Option 462 4-13