HP 3580A Operating And Service Manual page 80

Section V
PERFORMANCE TESTS Model 3580A
DISPLAY SMOOTHING .......... MAX
FREQ. SPAN/DIV ................ 5 KHz
SWEEP TIME/DIV . . . . . . . . . . . . . . . 5 SEC
SWEEP MODE ................. MANUAL
Option 002: Set dBm 900 Q/
LIN - dBm 600
n
switch to dBm 900 Q; set
INPUT MODE switch to UNBAL.
c. Adjust the MANUAL VERNIER full CCW.
Adjust ZERO CAL for a peak display indication.
d. Adjust the MANUAL VERNIER for a display indica-
tion at 10 KHz (2 major divisions from left graticule).
Momentarily press the following control:
DISPLAY ............... CLEAR WRITE
e. The display indication should always be less than
- 130 dB (6 major divisions down from top graticule, since
Full Scale
= -
70 dB).
f. Reposition the following front panel control:
RESOLUTION BANDWIDTH ........ 30Hz
g. Momentarily press the following control:
DISPLAY ............... CLEAR WRITE
The display indication should be less than - 140 dB (7
major divisions down from top graticule).
h. Reposition the following control:
FREQ. SPAN/DIV ............... 0.1 KHz
i. Adjust MANUAL VERNIER full CCW. Adjust ZERO
CAL for a peak display indication.
j. Adjust MANUAL VERNIER for a display indication
at 100 Hz (1 major division from leftmost graticule).
Momentarily press the following control:
DISPLAY ............... CLEAR WRITE
k. The display indication should be less than - 132 dB
(6.2 major divisions down from top graticule).
1. Adjust MANUAL VERNIER for a display indication
of 1 KHz (far right graticule). Momentarily press the
following control:
DISPLAY ............... CLEAR WRITE
m. The display indication should be less than - 140 dB
(7 major divisions down from top graticule).
n. Reposition the following control:
RESOLUTION BANDWIDTH . . . . . . . . 1 Hz
5-10
Momentarily press the following control:
DISPLAY ............... CLEAR WRITE
o. The display indication should be less than - 150 dB
(8 major divisions down from top graticule).
p. Readjust MANUAL VERNIER for a display indica-
tion at 100 Hz (1 major division from leftmost graticule).
Momentarily press the following control:
DISPLAY ............... CLEAR WRITE
q. The indication should be less than - 143 dB (7 .3
major divisions down from top graticule).
r. Reposition the following controls:
DISPLAY SMOOTHING ............. MIN
FREQ. SPAN/DIV .................. 5 Hz
s. Adjust MANUAL VERNIER full CCW. Momentarily
press the following front panel control:
DISPLAY ............... CLEAR WRITE
t. Adjust ZERO CAL for a peak response at the leftmost
graticule. Reposition the following front panel control:
DISPLAY SMOOTHING ............. MAX
u. Adjust the MANUAL VERNIER for a display indica-
tion at 10 Hz (2 major divisions from leftmost graticule).
Momentarily press the following control:
DISPLAY ............... CLEAR WRITE
v. The display indication should be less than - 135 dB
(6.5 major divisions down from top graticule). Remove the
1 kQ resistor from the input terminals.
5-33. Noise Sideband Test.
a. Reposition the following controls:
INPUT SENSITIVITY ............... CAL
FREQUENCY ................. 10.0 kHz
ST ART - CTR ..................... CTR
DISPLAY SMOOTHING ........... MIN
FREQ. SPAN/DIV .................. 5 Hz
SWEEP TIME/DIV . . . . . . . . . . . . . . 10 SEC
b. By alternately pressing and releasing DISPLAY -
CLEAR WRITE while adjusting MANUAL VERNIER,
center the display indication (a narrow spike).
c. Adjust the FREQUENCY dial (pulled out for fine
tuning) for a peak display of this spike.