User`s guide

26 User’s and Service Guide
87050A Option K24 Operation
Making Measurements
The following examples assume that you are using a parallel port connection with an
8720D, with the test set's parallel address set to "0". See “Setting the Test Set Address
Switch” on page 16 for information on setting the test set address.
Measuring Reflection
By leaving the DUT connected, as shown in Figure 12, and setting the network analyzer to
measure S11, you can measure reflection or return loss.
Measuring Transmission
Refer to Figure 12 on page 27 for the following discussion. With the 8720D set to measure
forward transmission (S
21
), the analyzer RF source is output through the analyzer PORT
1, and PORT 2 is set to receive the RF signal.
By using the following commands, you will connect PORT 20 of the test set to the
Transmission port, and you will connect PORT 21 of the test set to the Reflection port. You
will, therefore; be measuring forward transmission through the device under test when
measuring S
21
. This will provide you with gain or insertion loss information.
If directly controlling the 87050A Option K24, use the following GPIB commands:
OUTPUT 716;"PARALGPIO;"
OUTPUT 716;"PARAOUT19;"
OUTPUT 716;"PARALGPIO;"
OUTPUT 716;"PARAOUT45;"
OUTPUT 712;"tran_20"
OUTPUT 712;"refl_21"