Document number: S46-901-01 Rev. F / March 2011
2-7
S46/S46T/S46L Microwave Switch System Instruction Manual
Section 2: Connections
Figure 2-5
GPIB control connector
Remember the following restrictions when attaching instruments to the GPIB:
•
A maximum separation of 4 meters between any two instruments on the bus
•
A maximum total cable length of 20 meters
•
No more than 15 devices on the bus
•
No two instruments can have the same address
If you cannot meet these requirements, the use of bus extenders is recommended.
CAUTION
IEEE-488 common is connected to digital common. Maximum voltage
between digital common and earth ground is 0 V.
Connectors may be stacked to allow a number of parallel connections to one instrument. Two
screws located on a standard connector maintain secure connections between connectors.
NOTE
To minimize interference caused by electromagnetic radiation, use shielded
IEEE-488 cables such as the Keithley Model 7007.
To connect devices to the GPIB:
1.
Line up the cable connector with the IEEE-488 connector located on the rear panel of the
S46/S46T/S46L. The connector’s design allows installation to the port in only one position.
2.
Secure the connector by tightening the screws firmly (do not overtighten).
3.
Add any additional connectors to the port, as required.
4.
Connect the free end of the cable to the controller.
5.
Confirm that the primary address is set properly (see
for GPIB address
information).
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