Agilent Technologies 4294A Instruction Manual download pdf (Page 159)

Chapter 6 151

Calibration

Fixture Compensation

6. Calibration

Fixture Compensation

Fixture compensation procedure

Perform the fixture compensation as follows:

NOTE If the oscillator level is greater than 500 mV, an error, “REDUCE OSC LEVEL” or

“BRIDGE UNBALANCED,” may occur during the Short correction and measurement

may not be correct. When you set the oscillator level for measurement to 500 mV or even

greater, set it to 500 mV for the Fixture correction.

NOTE Fixture compensation consists of three compensation data acquisition processes: OPEN,

SHORT, and LOAD, but you do not need to obtain all three types of compensation data

when you perform fixture compensation. Each type of compensation data can be turned on

or off independently for measurement. For normal measurement, it is recommended that

you perform fixture OPEN compensation and fixture SHORT compensation.

NOTE For the 4294A, because the sending and receiving ends of a measurement path are

terminated with the characteristic impedance of 50 W at a measurement frequency of 15

MHz for no cable extension (direct connection type test fixture) or a measurement

frequency of 5 MHz or higher for 1 m/2 m cable extension, the trace may contain a gap at

15 MHz (or 5 MHz). You can remove this gap by executing the Load correction.

Step 1. Press the

[Cal] key to display the Calibration Menu.

Step 2. Select the calibration (compensation) data acquisition points in accordance with “Selecting

Calibration/Compensation Data Points” on page 155.

Step 3. Press the

FIXTURE COMPEN key to display the Fixture Compensation Menu.

Step 4. If required, set user-defined standard values in accordance with “Defining the standard

values for fixture compensation” on page 153.

NOTE When you perform fixture LOAD compensation for the 16451B Dielectric Test Fixture,

you need special setups and procedures for standard definition and other processes. See

“Fixture Compensation When the 16451B is Used” on page 136 for details.

When you complete the changes, press the

return key to return to the Fixture

Compensation Menu.

Step 5. Put the test fixture's device contacts in the OPEN state.

NOTE Refer to the operation manual furnished with each test fixture for more information on the

OPEN state of the test fixture. Generally, the OPEN state can be made by connecting no

device to the device contacts. If the distance between the HIGH electrode and the LOW

electrode can be adjusted for a test fixture, keep the same distance as when the test device

is inserted between the electrodes.

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Agilent Technologies 4294A Instruction Manual Page 159