Model 8901B Operation
Remote
Control
RF
Switch
DESCRIPTION
A
compatible, external power sensor
is
required for making accurate, absolute RF power measurements.
The Modulation Analyzer can be used with the following sensor configurations:
0
A
power sensor selected from the HP 8480 series sensors.
0
A
sensor module (such
as
the HP 11722A)
that
contains a power sensor,
an
RF switch, and
an
RF coaxial cable. The Modulation Analyzer controls the RF switch in the sensor module
to
automatically switch the RF input signal between the RF INPUT of the Modulation Analyzer
and the power sensor
as
measurements require.
0
A
sensor module, built by the user, that includes a power sensor (from the HP 8480 series sensors),
an
RF cable, and
an
RF switch (such
as
the HP 33311 series or the HP 8761A). The rear-panel
REMOTE CONTROL RF SWITCH outputs enable the Modulation Analyzer
to
automatically
switch the RF input signal between the RF input of the Modulation Analyzer and the power
sensor as measurements require.
NOTE
An
HP
478A
is
a standard sensor but
is
not compatible with the Modulation
Analyzer.
PROCEDURE
The following procedure provides a few guidelines for setting up and operating
a
remotely controlled
sensor module.
Connect the RF switch, power sensor,
RF
cable, and Modulation Analyzer
as
shown in the BLOCK
DIAGRAM.
Do
not connect
a
sensor module (such
as
the HP 11722A)
to
the SENSOR input if the
rear-panel remote control switches are
to
be
used
with
a
user-built sensor module. The control lines
are in parallel, and the internal switch drive circuits cannot drive both.
The remote outputs are capable of driving both 5V and 12V
to
15V switch solenoids. The solenoids
should be
of
a latching type, but they need
not
have automatic drive disconnect. Examples of compatible
RF switches are the HP33311B, Option 011 (5V solenoid) or the HP 8761A (12V
to
15V
solenoid).
Proceed with selected measurements. This user-built module will enable the Modulation Analyzer
to
automatically switch between its inputs
as
measurements require.
Remote Control RF Switch
3-10?'
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