HP 8568B, Performance Tests And Adjustments Manual, Page: 67 / 313

13. Average Noise Level Test
13. Average Noise
Level
Specification
Description
Equipment
Procedure
for frequencies MHz, for frequencies
MHz but Hz with 10 Hz resolution bandwidth, 0 input
attenuation, 1 Hz video filter.
Option 001:
for frequencies MHz, for
frequencies MHz but Hz with 10 Hz resolution bandwidth, 0
input attenuation, 1 Hz video filter (SIGNAL INPUT 1 only).
The average noise level is checked by observing the displayed noise
level at several frequencies with no input signal applied.
50 Ohm Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .HP
1.
2.
3.
Press
Connect CAL OUTPUT to SIGNAL INPUT 2.
Press Adjust AMPTD CAL for a MARKER amplitude
of -10.00
4.
5.
Press
Disconnect CAL OUTPUT from analyzer. Terminate SIGNAL
INPUT 2 with a 509 coaxial termination.
6.
Key in spectrum analyzer settings as follows:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
(
C
ENT
ER
FREQUENCY] . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501
HZ
FREQUENCY . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .O Hz
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Hz
REFERENCE LEVEL
)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -80
. . . .
TIME
] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
seconds
7.
8.
Press SWEEP and wait for completion of the sweep.
Press DISPLAY LINE Using DATA knob, place display
line at the apparent average amplitude of the noise trace (see
Figure 2-23).
Performance Tests 2-45