HP 3580A Service Manual

Section V
ADJUSTMENT PROCEDURES
Model 3580A
ad. Reposition the following front panel control:
AMPLITUDE MODE ............. LINEAR
ae. Adjust A4R6 (LINEAR GAIN ADJ.) for a full scale
screen display.
5-78. Bandwidth Gain Switching 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 ............ LINEAR
AMPLITUDE REF LEVEL ....... NORMAL
dBv/LIN - dBm 600 Q ........... dBv/LIN
INPUT SENSITIVITY ............ -20 dB
VERNIER (Amplitude) ........... CAL
(Fully CW)
FREQUENCY ............... 10.0 kHz
START- CTR ................... CTR
DISPLAY SMOOTHING ............. MIN
RESOLUTION BANDWIDTH ....... 300 Hz
FREQ. SPAN/DIV ................ SO Hz
SWEEP TIME/DIV ............. 0.1 SEC
SWEEP MODE ............... MANUAL
Option 002: Set dBm 900 Q/LIN - dBm 600 Q
switch to dBm 900 Q; set INPUT MODE
switch to UNBAL.
b. Replace the inner cover shield over A2-A5 and
screw down tightly.
c. Adjust the frequency synthesizer to a 10 kHz
- 20 dBV output (same level for Option 002). See Table
5-14 for proper level setting on the frequency synthesizer.
d. Adjust MANUAL VERNIER and the front panel
ZERO CAL pot for a peak reading in the center of the
display. Make the following full scale adjustments on the
appropriate bandwidth setting.
NOTE
The ZERO CAL pot may have to be readjusted
after each Bandwidth/Freq. Span setting for a
peak reading in the center of the screen.
RESOLUTION FREQ. GAIN
BANDWIDTH SPAN/DIV POT ADJ.
SETTING
100 Hz 50 Hz A4R5
Full scale 0 dB
30 Hz 10 Hz A4R4
display indi-
10 Hz
5 Hz A4R3
cation.
3 Hz
5 Hz
A4R2
1 Hz 5 Hz A4R1
5-24
5-79. Frequency Response 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 ........... 1 dB/DIV
AMPLITUDE REF LEVEL ....... NORMAL
dBv/LIN - dBm'600 Q ........... dBv/LIN
INPUT SENSITIVITY ............ -20 dB
VERNIER (Amplitude) ........... CAL
(Fully CW)
FREQUENCY . . . . . . . . . . . . . . . 01.0 kHz
START-CTR ................... CTR
RESOLUTION BANDWIDTH ....... 300 Hz
DISPLAY SMOOTHING .... , ........ MIN
FREQ. SPAN/DLV .............. 0.2 kHz
SWEEP TIME/DIV ............. 0.1 SEC
SWEEP MODE ................... REP
Option 002: Set dBm 900 Q/LIN - dBm 600 Q
switch to dBm 900 Q; set INPUT MODE
switch to UNBAL.
b. Adjust the frequency synthesizer for 1 kHz output at
- 20 dBV (- 20 dBm 900 n for Option 002), and connect it
to the 3580A INPUT (properly terminated). Adjust the
front panel CAL 10 KHz for a full scale (O dB) display.
c. Reposition the following front panel controls:
FREQUENCY ................. 40.0 kHz
INPUT SENSITIVITY ............. -10 dB
d. Adjust the signal source for a 40 kHz - 10 dBV signal
(- 10 dBm 900 Q for Option 002).
e. Adjust A9C2 (40 kHz - 10 dB AMP ADJ.) for a full
scale (O dB) display (± 1 minor division). In a similar
manner, perform the following adjustments:
SIGNAL SOURCE
INPUT
DISPLAY
OUTPUT LEVEL
SENSITIVITY
ADJUST
READING
0 dBV (or
0 A9C3
0 dB± .2 dB
- 0 dBm 900 .11)
+ 10 dBV (or
+ 10
A9C4 0 dB± .2 dB
0 dBm 900 .11)
f. Adjust the ac signal source to 1 kHz at + 10 dBV
(+ 10 dBm 900 n for Option 002). Reposition the follow-
ing front panel controls:
AMPLITUDE REF LEVEL
INPUT SENSITIVITY
FREQUENCY
-10 dB
+ 20 dB (According to
MAX INPUT indicator,
not white underlay on
INPUT SENSITIVITY
dial).
01.0 kHz

HP 3580A Specifications

General

Brand	HP
Model	3580A
Category	Measuring Instruments
Language	English