APC H15 Service Manual download pdf (Page 43)

User’s and Service Guide 5-9

Controlling the Test Set and Making Measurements

Commands

Calibrating the Test System

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

calibrate it 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 will need to 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 5-2. In this example setup the following tests will be

made:

• Return loss on the DUT's input and two output ports (A and B)

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

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

Figure 5-2 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 need to save the calibrations as instrument

states. See your analyzer user's guide for information on calibrations

and saving instrument states.

CAUTION When performing a full two-port calibration and making subsequent

measurements, you must use the transfer switch internal to the

Agilent 8753D/E to change the direction of the RF signal path. Do not

use the test set to change the direction of the RF signal path when you

are using a full two-port calibration. Doing so will render the

calibration invalid.

AGILENT 8753E

NETWORK ANALYZER

AGILENT 87050A OPTION H15

DUT

OUT

CALIBRATION

PATHS

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 85 86

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APC H15 Service Manual Page 43