Configuring the RF Multiplexers 25
Chapter 2
Connecting User Inputs to E1474A/E1475A
User inputs to the RF Multiplexer and Expander modules are via
user-supplied female 75 Ohm SMB connectors to the male 75 Ohm SMB
connectors on the modules. Figure 2-6 shows the RF Multiplexer 75 Ohm
SMB connectors and associated channel numbers.
Cabling Guidelines
•
The 75 Ohm connectors only work with one braided shield or one
braid and a foil wrap.
•
Always use shielded coaxial cables with the characteristic
impedance of 75 Ohm. Keep cables as short as possible,
especially in high-frequency circuits or pulse circuits where a
rise/fall time is critical.
•
Long cables can add delay time which can cause timing problems.
All test equipment, such as counters, spectrum analyzers, and
oscilloscopes must be terminated in the characteristic impedance
(75 Ohm) to minimize reflection loss.
•
The 75 Ohm SMB connectors are significantly different than the
standard 50 Ohm SMB connectors. Carefully plug the connectors
in and out to minimize damage to the connector. The 75 Ohm
SMB mating connectors and accessories are available only from
Agilent or E.F. Johnson Co.
1
•
See Examples 1 and 2 for information on connectors and
accessories.
Figure 2-6. 75 Ohm SMB Connector Locations
1. E.F. Johnson Co., 299 Johnson Ave., Waseca, MN 56093-0514. Telephone: 1-800-247-8256,
FAX: 1-507-835-6287
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