HP HP 8753E, User Manual, Page: 65 / 699

Required Equipment
Characterizing a duplexer requires that the test signals between the analyzer (a
instrument) and the duplexer (a device) are routed correctly. This example uses one of
the following adapters to perform this function:
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HP 8753E Option duplexer test adapter
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HP 8753E Option test adapter
You must also have a set of calibration standards for performing a full calibration on
your test set up.
Procedure for Characterizing a Duplexer
1. Connect the test adapter to the analyzer according to the instructions for your particular
model. Connect any test or cables to the duplexer test adapter.
2.
3. Set up the stimulus parameters for channel 1 (center/span frequencies, power level, IF
bandwidth). This example uses a span of 120 MHz centered at 860 MHz.
4. Uncouple the primary channels from each other:
. . . . . . . . . . . . . . . . . . . . .
Press set to OFF.
(This is necessary in order to set the test set I/O independently for each channel.)
Note Make sure you connect the standards to the port of the test adapter (or a
cable attached to it) for the calibration and to the Ant port for the
REVERSE calibration. The on the test adapter indicate the active ports:
a brightly lit LED indicates the source port; a dimly lit port indicates the input
port; an unlit LED indicates no connection.
7. When the calibration has been completed, save the instrument state:
8.
9. Set up channel 2 for the same stimulus parameters as channel 1.
10.
11.
Set up control of the test adapter so that channel 2 is measuring the receive path of the
duplexer: (Uncoupling the channels allows a different calibration for each signal path.)
Perform a full calibration on channel 2:
Making Measurements