HP 3580A Operating And Service Manual page 92

Section V
ADJUSTMENT PROCEDURES
Model 3580A
b. Adjust the front panel CAL 10 KHz pot fully CCW.
c. Adjust the frequency synthesizer to - 20 dBV
10.0 kHz output (Option 002, adjust to - 20 dBm 900
Q)
and connect the synthesizer to the INPUT terminals of the
3580A.
NOTE
Always terminate your source properly and
consult Table 5-14 for the setting needed for a
signal source calibrated in dBm 50
Q
Figure
5-6 shows the proper hookup for use with a 50
ohm frequency synthesizer such as the 3320B.
d. Adjust MANUAL VERNIER for a maximum display
indication.
e. Connect the
multimete~
(AC mode, 10 volt range) to
A4 TPl. Note the reading with the front panel 10 KHz CAL
pot fully CCW.
f. Adjust front panel CAL 10 KHz pot for 1.26 times
the reading obtained in Step e.
Examples:
100 mV x 1.26 = 126 mV
101mVx1.26 = 127 mV
102 mV x 1.26 = 129 mV
103 mV x 1.26 = 130 mV
104 mV x 1.26 = 131 mV
105 mV x 1.26 = 132 mV
106 m V x 1 .26 = 134 m V
107 mV x 1.26 = 135 mV
108 mV x 1.26 = 136 mV
109 mV x 1.26 = 137 mV
110 mV x 1.26 = 139 mV
111mVx1.26 = 140 mV
112 mV x 1.26
=
141 mV
113 mV x 1.26 = 142 mV
114 mV x 1.26 = 144 mV
115mVx1.26 = 145 mV
116 mV x 1.26 = 146 mV
117 mV x 1.26 = 147 mV
118
m
V
x
1.26
=
149 m V
119mVxl.26=150mV
120 mV x 1.26 = 151 mV
121mVx1.26 = 152 mV
122 mV x 1.26 = 154 mV
123 mV x 1.26 = 155 mV
124 mV x 1.26 = 156 mV
125 mV x 1.26 = 158 mV
126mVx 1.26= 159mV
127 mV x 1.26 = 160 mV
128 mV x 1.26 = 161 mV
129 mV x 1.26 = 163 mV
130 mV x 1.26 = 164 mV
131mVx1.26 = 165 mV
132 mV x 1.26 = 166 mV
133 mV x 1.26 = 168 mV
SPECTRUM ANALYZER
hp
3580A
·~-~@
o
f"()\ f"(j\
50n FEED-THRU
I..::'.) I..::'.) TERMINATION
CJ CJ
o (;:::\ hpll048C
8
0
8
@
~ ~]:: _.:l1ia:~=):Oj}---.._
g. Turn 3580A POWER SWITCH to OFF. Place A4 on
extender boards. Turn the power switch back to ON and
reposition the following front panel control:
AMPLITUDE MODE ............. LINEAR
h. Push DISPLAY - CLEAR WRITE momentarily.
Adjust A4Ll (I.F. AMP GAIN ADJ.) for a maximum screen
display. Remove the source from the 3580A INPUT.
i. Set the controls of the multimeter for DC mode, 1
volt range. Connect the multimeter to the rear panel
Y-AXIS output and adjust A4Rll (DC OFFSET ADJ.) for
0 volt Y-AXIS output level(± 10 mV).
j. Turn POWER switch to OFF, replace A4 into card
nest of 3580A, and turn power switch back to ON (AC).
Reconnect the frequency synthesizer (with proper termina-
tion) to the 3580A INPUT. Push CLEAR WRITE momen-
tarily. Adjust the source to the same level as in Step c
(- 20 dBV for standard instrument or - 20 dBm 900
Q
if
Option 002).
Table 5-14. Conversion Table.
3580A INPUT
33208 or OTHER
SIGNAL LEVEL 50 OHM SOURCE
+ 10 dBv + 23.01 dBm
+10dBm900rl +22.55 dBm
0 dBv + 13.01 dBm
o
dBm 900 n +12.55dBm
- 10 dBv + 3.01 dBm
- 10 dBm 900 n +2.55 dBm
- 20 dBv
- 6.99 dBm
- 20 dBm 900 n
- 7.45 dBm
- 30 dBv - 16.9 dBm
- 30dBm900n - 17.45 dBm
- 40 dBv
- 26.99 dBm
- 40 dBm 900 n
- 27.45 dBm
- 50 dBv - 36.99 dBm
- 50 dBm 900 n - 37.45 dBm
- 60 dBv - 46.99 dBm
- 60 dBm 900 n - 47.45dBm
- 70 dBv - 56.99 dBm
- 70 dBm 900 n
- 57.45 dBm
- 80dBv
- 66.99 dBm
- 80dBm900rl
- 67.45 dBm
FREQUENCY SYNTHESIZER
hp
33200
0 0 0 0 0
0 0 0 0
ca
rn
3580 - B - 3588
ABSOLUTE
VOLTAGE
3.162 volts
3 volts
1 volts
.949 volts
.3162 volts
.3000 volts
.1 volts
.0949 volts
.03162 volts
.03 volts
.01 volts
.095 volts
3162 mV
3mV
1 mV
.95mV
.3162 mV
.3mV
.1 mV
.095 mV
Figure 5-6. Proper Hookup.
5-22