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Model 3320A/B
Section III
Figure 3-7. Option 002 Circuit Diagram.
3·58. REFERENCE CRYSTAL OVEN.
5 Ml'tl Oul
';'1~\1
"'-
'OK
L.
~
"-
5MHI
T
'OK
,
vcxo
'OK
'-'
,
-I~V
,
nlO~
·8·l
3-60. For operation, connect a short jumper cable between
the 5 MHz OUT and EXT FREQ REF (both on rear panel).
A
circuit diagram for
the Option 002 is shown in Figure
3-7.
To XAI7-H
To X.c.17-9
,'s
'"
To XAI7-J
3-59. The 3320A/B Option 002 is
a
standard instrument
with an oven controlled, 5 MHz, reference crystal oscillator.
The signal from the 5 MHz oscillator is applied to the
reference phase lock assembly to phase lock the 20 MHz
VCXO. The result is an increase in 3320A/B output
frequency accuracy and stability (See Table 1-2).
An
Option 002 Field Installation Kit is obtainable by ordering
Accessory Kit 11237A.
3-57. The End Output (EOP) signal allows the external
controller to terminate all activity on the GPIB bus lines.
When this line is set low by the controller, the 3320B and
all other instruments paralleled to the bus lines, will set all
data lines, MRE, DAV, RFD, and DAC HIGH.
3·56. End 0
utput.
3-55. The delay code programmed also controls the level-
ing mode of operation (Delay Codes 0-3, LEVELING ON
(> 10Hz), Delay Code 4-7, LEVELING OFF). 11,e
programmed frequency (or group of frequencies) must be
considered when selecting the leveling mode. If a frequency
of
10Hz
or less is programmed, the leveling should be
programmed OFF. This will eliminate any distortion of the
33206 output caused by the leveling loop (See Paragraph
3-12). If a frequency greater than 10 Hz is programmed, the
leveling should be programmed ON (> 10Hz).
3-54. When the 3320B is programmed for a low frequency
(below 1000 Hz) and the leveling is ON (> 10Hz), the
output can become distorted due to the response time of
the ampLi tude section. The response can be slowed to
eliminate this distortion by programming a delay code of 3.
With all other delay codes the response is in the fast mode.
3-9
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