HP 3320A Operating And Service Manual page 26

Model 3320AjB
~FERENCE
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SECTION
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10kHz
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FREQUENCY OSCILLATOR
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CIRCUITRY
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VTOI
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10 kH:
PHASE
LOCK
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'Ok",
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r
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20 "1Hz
REFERENCE
18 MHZ
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ISMH.
RANGE
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OSCILLATOR
Z MHz
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DIVIDERS
CIRCUITR Y
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2 MHr, 20 MH.
~PLITUOE
SECTION
L
.-J
nzo.v...
·)~,~
Figure 4-3. Reference Sources.
GPIB control, as in the 3320B Option 007. The various
3320A!B controller sections are shown in the controller
Configuration diagram, Figure 7-6. Each conrroller is
discussed in the following paragraphs.
4-21. 3320A Standard Controller. The controller for the
standard Model 3320A is shown in Figure 4-4. The BCD
codes representing the front panel frequency, range, leveling
and vernier in/out settings are converted in the AlO
assembly and applird to the frequency section. The
amplitude setting is controlled manually by the amplitude
potentiometer on the front panel.
CONTROLLER
PANEL
fRONT ~ INTERFACE ~ FREaUENCY
PANEL
ICOOE
SECTION
CONTROL
TRANSFORMATION)
(
SEE SCHEMATIC 1
FOR CODES
AMPLITUDE
SECTION
n20A/8-8'3~09
Figure 4-4. 3320A Standard Controller.
4-22. 3320B Standard Controller. The controller for the
standard Model 3320B consists of rhe front panel and the
panel interface assembly as shown in Figure 4-5. The BCD
data representing the front panel frequency setting is
converted in the panel interface block and applied to the
frequency sections. The BCD data representing the front
panel amplitude setting is added to a preset BCD number
in
the panel in terface assembly. This addition provides the
proper BCD code for controlling the amplitude section.
Since the 3320B output is calibrated in dBm, the magni-
tude of the preset BCD number depends on the output
impedance of the 3320B.
4-23. 3320A BCD Option 003. The 3320A Option 003
controller is shown in Figure 4-6. Option 003 can be
Section IV
controlled from the front panel or remotely with parallel
BCD lines as outlined in Section III of this manual. In local
control (front panel) the BCD code representing the
frequency, range, and vernier in/out setting are converted in
the BCD control circuits. The converted BCD code from
the BCD control circuits is applied to the frequency section
through the
An
Cable Board. In remote control mode the
BCD information from the remote lines is converted in the
BCD control circuits and applied to the frequency section.
The Delay Flag shown in Figure 4-6 remains low for the
amount of delay time programmed per Section III. The
amplitude setting for Model 3320A Option 003 is
con~
trolled manually by the front panel potentiometer.
CONTROLLER
PANEL
INTERFACE
(CODE
TRAIII$FORMATION)
Figure 4-5. 3320B Standard Controller.
CONTROLLER
CABLE
60ARD
;
A22
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8CO
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n
FROtH
CONTROL
lieD I I
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FREQUENCY
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PANEL
CIRCUITS
1 \
l'
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AI3
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I ' r_
A238A24A
.... J
REMOTE {
'"
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SEE SCHE ......TlCS
INPUTfDUTPUT DELAY FLAG
FOR CODES
,nO"I-I· ""
Figure 4-6. 3320A BCD Controller.
CONTROLLER CABLE
,80ARO
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FRONT
'CO
FREOUEOlCY
'CO
,.. ... 06.2:2:.
PANEL
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FREOUENCY
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."
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COI<iTROL
1\#
SECTION
A23
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----j '"""'"
tl\,
~
' " "' " ' '
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{
COI<iTROL SECTIO"l
'CO
A24B
INPUTIOUTPut
OELAY FLAG SEE SCHEMATICS
fOR COOES ........_._ ..'.
Figure 4-7. 3320B BCD Controller.
4-24. 3320B BCD Option 004. The 3320B Option 004
controller is shown in Figure 4-7. Option 004 can be
controlled from the front panel or remotely with parallel
BCD lines as outlined in Section III of this manual. In local
control the BCD data from the front panel is processed by
A23 and A24B assemblies", shown in Figure 4-7. In
remme control mode the BCD data from the remote input
lines is processed by A23 and A24B.
4-25. The frequency control block (A23) converts the BCD
codes representing frequency, range, leveling, and vernier
in/out settings into appropriate BCD codes for controlling
the frequency and amplitude leveling. The BCD data
representing the amplitude setting is added to a preset BCD
number in the amplitude control block (A24). This
4-3