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Model li713A
Operation
NOTE
To drive ten devices, the 11713A requires
attenuator cables connected at ATTEN
X and Y and switch cables connected to
S9 and SO.
It is recommended that two 28.7Vzener
diodes be connected back-to-back across
the relay coils to reduce voltage tran¬
sients (HP Part No. 1902-0572).
The attenuator cables (see Figure 3-5) are supplied
with 12-pin connectors thatmay not be useable on
some equipment. In these instances, the cables
may be modified by removing a connector. (A 9-
wire cable with only one connector is available
under HP part number 8120-2178.) Table 3-6 des¬
cribes the cable wire colors/connector pin num¬
bers and corresponding status of the front panel
pushbutton indicators. To drive a simple non-
latching relay, only one wire in a pair needs to be
used for the ground (Figure 3-6).
Driving Additional Coaxial Switches
Figure 3-4 shows the rear panel connections and
the HP-IB commands necessary to change the
position of HP 33311 series coaxial switches.
These connections are made to the SO outputs.
(Connections to the S9 output can also be used.)
However, control for the HP 33311 coaxial
switches may also come from the rear panel
ATTEN X output or ATTEN Y output. Figure 3-5
illustrates the connections/pin numbers for each
connector: ATTEN X or ATTEN Y. By using these
same connections to 33311 switches, control can
be extended to four additional switches or eight
switches if both outputs are used and to 10
switches if the S9 and SO outputs are also used.
NOTE
Because of voltage and current limita¬
tions this application applies to the
standard 333UB and not to Option Oil.
Table 3-6. Attenuator Cable Connector Pin Numbers and Wire Color Codes
FronLEanelJIushbuttonil-
Rear Panel connectors ATTEN X or Y. and Attenuator Cable -
ATTENUATOR X.Yand SWITCHES
Pin Numbers
Attenuator Cable Wire Color Code
Pushbutton Humber
Pushbutton LEDs
1
Red (24 Vdc)
2
White/Brown (Gnd)
3,4
SWITCHES
(Connected to S9 and SO outputs)
9
ON
ATTEN X 3 (S9-A)
Gray
9
OFF
ATTEN X 4 (S9-B)
White/Red
0
ON
ATTEN Y 3 (SO-A)
Gray
0
OFF
ATTEN Y 4 (SO-B)
White/Red
ATTENUATOR
X
Y
1
5
(OFF
5
Violet
\ON
6
Yellow
2
6
(OFF
7
Black
ION
8
Green
3
7
jOFF
9
Orange
\ON
10
Blue
4
8
(OFF
11
Brown
Ion
12
White
•The ON/OFF status of the pushbutton lamps indicates which cable wire or pin on the rear panel connector is grounded For example if
An'ENUATORXpushbutton3ismuminated.pmlOoftheATTENXconnector(bluewireofthecable)i8groundedandpin9floatsatahigh
impedance. For the SWITCHES, if pin 3 is grounded (lamp on), pin 4 is connected to -f24 V.
3-15
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