HP E1368A - Manual (Page 14)

Power Supply
Circuit
Power to operate the coaxial switches can be supplied internally or
externally, dependent on the type of coaxial switch used.
•
Internal voltages of either +5V or +12V can be selected using
jumpers on the board. These voltages are routed through the module
from the mainframe backplane.
Note Check mainframe power availability before using internal voltages.
•
External voltages of up to 42Vpk can be connected using the
EXTernal POWER terminal block.
Caution MAXIMUM VOLTAGE. The maximum voltage that may be
applied to the EXTernal POWER terminal is 42Vpk. Remove the
F3 fuse when using external switch power.
MAXIMUM CURRENT. The maximum current that the control
circuit can accommodate is 1 amp per switch. Maximum
current also depends on the output capacity of the mainframe
or power supply used.
HP E1368A
Switches
The HP E1368A Microwave Switch module contains three HP 33311B
Option 011 (8672B Option 005 and 100) microwave Switches:
•
Broad bandwidth (DC - 18 GHz).
•
High isolation (>90 dB to 18 GHz).
•
Excellent repeatability (typically 0.03 dB after 1,000,000 switchings).
•
Internal 50
Ω
terminations.
These coaxial switches allow +5V coil voltage electrical characteristics
(drive voltage) operation instead of the standard +24V. This is necessary
since the Microwave Switch module provides only +5V or +12V for driving
microwave switches.
These coaxial switches are break-before-make switches controlled by a
latching solenoid. Internal coil contacts open and remove coil voltage after
a switching operation to minimize the amount of heat dissipated near the
switch contacts.
When a coil is energized and a switching operation occurs, a pivot armature
in the microwave switch also operates both sets of contacts, either closing
the switch or connecting it to the 50
Ω
termination.
Chapter 1 Getting Started with the HP E1368A/69A/70A 13
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