User`s guide

User’s and Service Guide 3-9

Controlling the Test Set and Making Measurements

Calibrating the Test System

After the test set has warmed up for at least two hours, you should

calibrate before making any measurements. Refer to your network

analyzer user’s guide to determine the type of calibration appropriate

for the measurements you will be making.

You must calibrate each measurement path separately and store the

calibration as an instrument state in the network analyzer. Refer to

your network analyzer user’s guide for information on how to calibrate

and store instrument states.

Refer to Figure 3-2. In this example setup the following tests will be

made:

• Return loss on the DUT input and 2 output ports (A and B)

• Insertion loss (or gain) between the DUT input and port A

• Insertion loss (or gain) between the DUT input and port B

Figure 3-2 Calibrating the Test System

For the best accuracy, you should perform a full two-port calibration

between test set ports 1 and 2, and again between ports 1 and 3. As

mentioned before, you must save the calibrations as instrument states.

See your analyzer user’s guide for information on calibrations and

saving instrument states.