HP 8568B, Performance Tests And Adjustments Manual, Page: 267 / 313

4. 6 Resolution
Bandwidth
Accuracy Test
Related Adjustment
Specification
Description
Equipment
Procedure
6 Bandwidth Adjustments
3 MHz bandwidth
30 Hz to 1 MHz bandwidths
+ -0%, 10 Hz bandwidth
30 and 100 bandwidth accuracy figures only applicable
Relative Humidity, C.
The 6 bandwidth for each resolution bandwidth setting is
measured with the MARKER function to determine bandwidth
accuracy. The CAL OUTPUT is used for a stable signal source.
None required
1. Press
PRESET
).
2. Connect CAL OUTPUT to SIGNAL INPUT 2.
3. Key in spectrum analyzer settings as follows:
[
CENTER FREQUENCY
)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MHZ
FREQUENCY SPAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MHz
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 MHz
[
REFERENCE LEVEL
]
.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10
4. Press SCALE LIN pushbutton. Press (resolution
bandwidth) for units in
5. Adjust
[
REFERENCE LEVEL
)
to position peak of signal trace at (or just
below) reference level (top) graticule line. Press SWEEP (SINGLE_).
6. Press MARKER [NORMAL) and place marker at peak of signal trace
with DATA knob. Press MARKER and position movable marker
6 down from the stationary marker on the positive-going edge
of the signal trace (the MARKER A amplitude readout should be
-6.00
It
may
be necessary to press SWEEP
and adjust
[
CENTER FREQUENCY
]
to center trace on screen.
7. Press MARKER and position movable marker 6 down
from the signal peak
on
the negative-going edge of the trace (the
MARKER Aamplitude readout should be .OO The 6
bandwidth is given by the MARKER A frequency readout. (See
Figure 1.) Record this value in Table 1.
Option 462