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STEP 5. Setting Electrical Length
Phase shift produces measurement error in the test fixture's transmission line because the
wavelength at RF frequency is very short relative to the transmission line's physical length.
To remove this measurement error, you must set the electrical length of the test fixture
(electrical length from 7-mm terminal to DUT connection plane).
For the E4991A, electrical length values are individually registered for standard Agilent
test fixtures. By selecting the model number of a test fixture, the electrical length is set
automatically. When connecting test fixtures custom-made by the user, it is necessary to
input the electrical length values.
Procedure for Using Mouse and Keyboard
Step 1. Click
Cal/Comp...
Step 2. Set the electrical length by either of the following methods.
o Using a test fixture that is registered
Select the model number of the test fixture in the Fixture Type box (Figure 3-44).
Figure 3-44
Selecting test fixture
o Using a test fixture that is made by the user
Select User in the Fixture Type box. Then select the Fixture Length box and input the
electrical length with the keyboard. When inputting the electrical length of 14 mm, for example,
type [1] [4] [m] [Enter] (Figure 3-45).
Figure 3-45
Inputting electrical length
Chapter 3
Basic Operations for RF Devices Measurement
on the
menu (Figure 3-27).
Stimulus
STEP 5. Setting Electrical Length
71
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