Required Equipment; Procedure For Characterizing A Duplexer - Agilent Technologies 8719D User Manual

Required Equipment

Characterizing a duplexer requires that the test signals between the analyzer (a Z-port
instrument) and the duplexer (a 3-port device) are routed correctly. This example uses one of
the following adapters to perform this function:
HP 87533 Option K36 duplexer test adapter
n
You must also have a set of calibration standards for performing a full 2-port 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 fixture or cables to the duplexer test adapter.
2. Press IPreset)
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 m, set CDUPLEB @I to OFF.
(This is necessary in order to set the test set I/O independently for each channel.)
5. Set up control of the test adapter so that channel 1 is T
6. Perform a full 2-port calibration on channel 1. (Refer to chapter 5, if necessary.)
Press Cal) $XLfBIkATE l#$NJ FTJLL 2-PORT , and follow the instructions to complete the
calibration.
Make sure you connect the standards to the T
Note
cable attached to it) for the FORWARD calibration and to the Ant port for the
REVERSE calibration. The LEDs 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:
Press @ave/Recall] SAVJJ STATE
8. Press @iGTj.
9. Set up channel 2 for the same stimulus parameters as channel 1.
Press 1Center) (%ZJ (iGJJ (%jZJ (ZGJ cM_II?)
10. 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.)
Press lGi) TTL I/Q Tn, OUT
:
X
port of the test adapter (or a
X