HP 3580A Service Manual

Model 3580A
ADJUSTMENT PROCEDURES
Section V
w. Reposition the following front panel controls: :
FREQUENCY ................. 00.0 kHz
RESOLUTION BANDWIDTH ...... 300 Hz
SWEEP TIME/DIV . . . . . . . . . . . . . . . 2 SEC
SWEEP MODE ..................... REP
x. Adjust Al3Rl (HORIZONTAL GAIN ADJ.) and
Al3R2 (HORIZONTAL POSITION ADJ.) for a full IO cm
display. The IO kHz signal and its harmonics should fall on
the proper graticule marking ± I /2 minor divisions (2nd,
4th, 6th, 8th and 10th graticule from the left).
y. Connect·the input of the oscilloscope to A3TPI I. Set
the oscilloscope input to de coupling. Connect a jumper
between A3TP3 and A3TP4.
z. Adjust the A3RI4 (RAMP COMPARATOR BAL-
ANCE) so that the output of the ramp comparator (on
scope) just changes states.
aa. Remove the jumpers from the A3 board.
ab. Reposition the following front panel control:
SWEEP TIME/DIV ............... 0.1 sec
ac. Alternately press and release the STORE pushbut-
ton, adjusting A8R4 (RAMP SIZE ADJ.) so that the
40 kHz harmonic of the CAL signal falls on the same point
for both the STORE and non-STORE display modes.
5-67. Log Sweep Adjustments.
a. Position the following front panel controls: (Only
those controls printed in BOLD require a change from the
previous adjustments).
ADAPTIVE SWEEP ............... OFF
DISPLAY ........ All pushbuttons released
AMPLITUDE MODE ...... LOG IO dB/DIV
AMPLITUDE REF LEVEL ....... NORMAL
dBv/LIN - dBm 600 fl ........... dBv/LIN
INPUT SENSITIVITY . . . . . . . . . . . . . CAL
VERNIER (Amplitude) ........... CAL
(Fully CW)
FREQUENCY ............... 00.0 kHz
START-CTR ................. START
RESOLUTION BANDWIDTH ....... 300 Hz
DISPLAY SMOOTHING ............. MIN
FREQ. SPAN/DIV ................ 5 kHz
SWEEP TIME/DIV ............. O.S SEC
SWEEP MODE .............. LOG ZERO
Option 002: Set dBm 900 fl/LIN - dBm 600 n
switch to dBm 900 fl; set INPUT MODE
switch to UNBAL.
b. Momentarily push:
DISPLAY ............... CLEAR WRITE
Adjust the front panel ZERO CAL pot for a peak at the left
graticule. If the peak is off the screen, adjust A13R3 for an
on screen indication.
c. Reposition the following front panel control:
SWEEP MODE ..................... LOG
d. Allow the 3580A to make three complete sweeps.
Then adjust A3R76 (20 kHz LOG SWEEP ADJ.) so that
the 20 kHz harmonic of the CAL signal falls on the 20 kHz
LOG SWEEP graticule.
NOTE
After each adjustment of AJR 76, wait for the
3580A to sweep through 20 kHz before at-
tempting to readjust the setting.
5-68. Line Generator Adjustments.
5-69. This adjustment properly aligns the line generator
circuitry. The adjustment is usually not necessary, but
should be done if components in the high voltage power
supply are changed, or if the display exhibits overshoot to
abrupt level changes.
a. Position the following front panel controls: (Only
those controls printed in BOLD require a change from the
previous adjustments).
ADAPTIVE SWEEP ................. OFF
DISPLAY ~ . . . . . . . All pushbuttons released
AMPLITUDE MODE ....... LOG IO dB/DIV
AMPLITUDE REF LEVEL ....... NORMAL
dBv/LIN -dBm 600 fl ............ dBv/LIN
INPUT SENSITIVITY ............... CAL
VERNIER (Amplitude) ............ CAL
(Fully CW)
FREQUENCY . . . . . . . . . . . . . . . . 10.0 kHz
START- CTR ..................... CTR
RESOLUTION BANDWIDTH . . . . . . 300 Hz
DISPLAY SMOOTHING ............. MIN
FREQ. SPAN/DIV ............... 0.2 KHz
SWEEP TIME/DIV .............. 0.1 SEC
SWEEP MODE ................. MANUAL
Option 002: Set dBm 900 st/LIN - dBm 600 n
switch to dBm 900 n; set INPUT MODE
switch to UNBAL.
b. Adjust MANUAL VERNIER for a peak display
signal. Note: The Amplitude VERNIER may have to be
adjusted to keep the signal within the display limits.
c. Momentarily press:
DISPLAY ............... CLEAR WRITE
5-19

HP 3580A Specifications

General

Brand	HP
Model	3580A
Category	Measuring Instruments
Language	English