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SECTION 3
Operation
BNC ANALOG
INPUT (Front Panel)
The AM IN BNC can be used to apply an external analog
input
signal which controls the amplitude
of the
waveform.
Input voltage range: -3V to +lV
Allowable maximum input voltage: rtl5V.
Input phase range: DC to 1OOkHz.
Input impedance: Approximately 1OkQ.
Signal ground: insulated from ground.
Circuit: See Figure 3-2, Analog Input Circuit.
+6.3V
AM IN
Figure 3-2.
Analog Input Circuits
DIGITAL
INPUT CONNECTOR
(Rear Panel)
A third type of input is the DIGITAL INPUT. One digital,
36-pin, D-type input connector transfers MAIN SYN-
THESIZER signals from a master Model 3930 to a Model
3933A slave unit, and between successive Model 3933A's
in a chain of phase shifters. A jumper cable, CA-94 is re-
quired to interconnect units.
The main synthesizer signal from a Model 3930A (master
unit) is applied to the DIGITAL IN connector on the rear
panel of a Model 3933A (slave unit). If an additional
phase shifter unit is chained to provide multiple phase
operation, a second cable (CA-941 is connected from the
DIGITAL OTJT of the first slave, to the DIGITAL IN on
the rear panel of the second slave unit. This may be re-
peated until a maximum of 5 (five) slave units are tied to a
single master synthesizer. The DIGITAL IN and DIGI-
TAL OUT signals at the rear panel of the slaves are identi-
cal to the master main synthesizer output signal.
Interconnection details are shown below, in Figure 3-3.
CA-94
Cable
3930A
3933A
Next
,
\
I
3933A
3933A
Figure 3-3.
Typical Digital I/O Interconnections
3-2
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