HP 8568B, Performance Tests And Adjustments Manual, Page: 35 / 313

4. Resolution Bandwidth Accuracy
4. Resolution
Bandwidth
Accuracy Test
Related Adjustment
Specification
Description
Equipment
Procedure
(For instruments with Option 462, refer to Chapter 4.)
Bandwidth Adjustments
3 MHz
3 to 1 MHz
10 Hz to 1
30 and 100 bandwidth accuracy figures apply only with
Relative Humidity,
The 3 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.
2.
3.
4.
5.
6.
7.
Press
PRESET).
Connect CAL OUTPUT to SIGNAL INPUT 2.
Key in spectrum analyzer setting as follows:
(CENTER FREQUENCY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FREQUENCY SPAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MHz
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 MHz
[
R E F E R E N C E L E V E L
)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10
Press SCALE LIN pushbutton. Press (resolution
bandwidth).
Adjust
[
REFERENCE LEVEL
]
to position peak of signal trace at
reference level (top) graticule line. Press SWEEP
Press MARKER and place marker at peak of signal trace
with DATA knob. Press MARKER In] and position movable marker
3
down from the stationary marker on
the
positive-going edge
of the signal trace (the MARKER A amplitude readout should be
-3.00
It may be necessary to press SWEEP
and adjust
[
CENTER FREQUENCY
)
to center trace on screen.
Press MARKER and position movable marker 3 down
from the signal peak on the negative going edge of the trace
(the
MARKER A amplitude readout should be .OO The 3
bandwidth is given by the MARKER A frequency readout (see
Figure 2-6). Record this value in 2-8.
Performance Tests