HP 8568B, Performance Tests And Adjustments Manual, Page: 275 / 313

5. 6 Resolution
Bandwidth
Selectivity Test
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 bandwidth ratio:
1, 3 MHz to 100 bandwidths
1, 30 to 30 Hz bandwidths
60 points on 10 Hz bandwidth are separated by Hz
Bandwidth selectivity is found by measuring the 60 bandwidth
and dividing this value by
the
6 bandwidth for each resolution
bandwidth setting from 30 Hz to 3 MHz. The 60 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 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
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MHz
FREQUENCY SPAN]
20 MHz
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MHz
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Hz
SWEEP
4. Press MARKER and position marker at peak of signal
trace. Press MARKER and position movable marker 60
down from the stationary marker on the positive-going edge of
the signal trace (the MARKER A amplitude readout should be
-60.00
It may be necessary to press SWEEP
and adjust
FREQUENCY
_)
so that both 60 points are
displayed. (See Figure 4-4.)
5. Press MARKER and position movable marker 60 down from
the signal peak on the negative-going edge of
the
signal trace (the
MARKER A amplitude readout should be .OO
6. Read
the
60 bandwidth for the 3 MHz resolution bandwidth
setting from the MARKER A frequency readout (Figure 4-4) and
record the value in
4-4.
4-10 Option 462